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<h1><span id="ctl00_ArticleTopHeader_ArticleTitle" class="ArticleTopTitle">Getting the most out of Event Viewer</span></h1>
<b>By <a href="http://www.codeproject.com/script/Articles/MemberArticles.aspx?amid=144339">Manoj G</a></b><br>
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<span id="ctl00_ArticleTopHeader_ArticleDescr">This
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<span id="ctl00_ArticleTopHeader_ArticleAttributes" class="SmallText">VB.NET 1.0, Win2K, Windows, .NETVisual Studio, VS.NET2002, Dev</span>
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<tbody><tr><td>Posted:</td><td><b>17 May 2003</b></td></tr>
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<h2>Introduction</h2>
<p>Ideally, a good software application should never, or occasionally,
come up with error conditions or exceptions. But as we all know, this
is far from reality. So, when an exception does occur, a good
application should just not log plain error messages, but also provide
troubleshooting information and detailed information about the error in
terms of its source and causes.</p>
<p>The Windows Event Viewer has always been the most suitable place to
log error messages generated by applications. This article explains how
we can use the .NET Event Logging API to effectively log error
information. The article also touches upon some practices for effective
error message management, like maintaining localized error messages and
troubleshooting hyperlinks. We shall begin with some basics of event
logging like event types, log-files, etc, and then cover the
implementation aspects with respect to .NET.</p>
<h2>Event types</h2>
<p>There are basically five types of events that can be logged. Each
event is of a particular type, and an error logging application
indicates the type of event when it reports one. The Event Viewer uses
this type, to determine the icon to display in the list view of the log.</p>
<p>
</p><table border="1">
<tbody>
<tr>
<td>
<p><b>Event Type</b></p></td>
<td><b>Description</b></td></tr>
<tr>
<td>Information</td>
<td>This indicates a significant, successful operation. For example, an event indicating that a service has started.</td></tr>
<tr>
<td>Warning</td>
<td>Warning events indicate problems that are not immediately
significant, but those that could cause problems in the future.
Resource consumption is a good example for a warning event. </td></tr>
<tr>
<td>
<p>Error</p></td>
<td>Error events indicate significant problems that the user should
know about. Error events usually indicate a loss of functionality or
data. </td></tr>
<tr>
<td>Failure Audit</td>
<td>Failure audit events are security events that occur when an audited
access attempt fails. A failed attempt to open a file (due to lack of
permissions) is an example for a failure audit event. </td></tr>
<tr>
<td>Success Audit</td>
<td>Failure audit events are security events that occur when an audited
access attempt fails. A failed attempt to open a file (due to lack of
permissions) is an example for a failure audit event </td></tr></tbody></table>
<h2>Event logging elements</h2>
<p>The following are the major elements that are used when logging events:</p>
<h3>Log-files</h3>
<p>log-file is the place where the all event entries are made. The event logging service uses information stored in the <code lang="text">EventLog</code> registry key. The <code lang="text">EventLog</code> key (shown in Figure.1) contains several sub-keys called <code lang="text">logfiles</code>.
log-file information in the registry is used to locate resources that
the event logging service needs when an application writes to and reads
from the event log. The default log-files are <i>Application</i>, <i>Security</i>, and <i>System</i>.</p>
<p><img alt="EventLog key in the Registry" src="evtvwr.aspx_files/eVTVWR1.JPG" width="123" height="96"></p>
<p><b>Figure 1:</b> <code lang="text">EventLog</code> key in the registry</p>
<p>Applications and services use the <i>Application</i> log-file, whereas device drivers use the <i>System</i> log-file. The system generates success and failure audit events in the <i>Security</i> log-file when auditing is turned on. Applications can also create custom log-files by adding an entry to the <code lang="text">EventLog</code>
registry key (This can be done programmatically as well). These logs
appear in the Event Viewer with the default log-files. It is a good
practice to have a separate log-file in the event viewer for your
application, as this makes isolating errors generated by your
application easier. Also, each log-file will be an independently
manageable unit. For instance, we can control the size of the log-file,
attach ACLs for security purposes etc. </p>
<h3>Event log records</h3>
<p>Information about each event is stored in the event log in an event
log record. The event log record includes time, type, source, and
category information of each event.</p>
<h3>Event sources</h3>
<p>The event source is the name of the software component (or a module
of the application) that logs the event. It is often the name of the
application, or the name of a subcomponent of the application, if the
application is large. While applications and services should add their
names to the Application log-file, or a custom log-file, the device
drivers should add their names to the <i>System</i> log-file. The <i>Security</i> log-file is for system use only. </p>
<p><img alt="Registry Structure: Event Source" src="evtvwr.aspx_files/Evtvwr2.jpg" width="122" height="126"></p>
<p><b>Figure 2:</b> Registry Structure: Event Source</p>
<p>Each log-file contains sub-keys for event sources (as shown in Fig
2).Each event source contains information specific to the software that
logs the events. The following table shows the various registry keys
that can be configured for an event source:</p>
<table border="1">
<tbody>
<tr>
<td><b>Registry Value</b></td>
<td><b>Description</b></td></tr>
<tr>
<td><code lang="text">CategoryCount</code></td>
<td>Specifies the number of event categories supported.</td></tr>
<tr>
<td><code lang="text">CategoryMessageFile</code></td>
<td>Specifies the path for the category message file. A category
message file contains language-dependent strings that describe the
categories.</td></tr>
<tr>
<td><code lang="text">DisplayNameFile</code></td>
<td>Specifies the file that stores the localized name of the event log.
The name stored in the specified file appears as the log name in the
Event Viewer. If this entry does not appear in the registry for an
event log, the Event Viewer displays the name of the registry sub key
as the log name.</td></tr>
<tr>
<td><code lang="text">DisplayNameID</code></td>
<td>Specifies the message identification number of the log name string.
This number indicates the message in which the localized display name
appears.</td></tr>
<tr>
<td><code lang="text">EventMessageFile</code></td>
<td>Specifies the path for the event message file. You can specify
multiple files, each separated by semicolons. An event message file
contains language-dependent strings that describe the events.</td></tr>
<tr>
<td><code lang="text">ParameterMessageFile</code></td>
<td>Specifies the path for the parameter message file. A parameter
message file contains language-independent strings that are to be
inserted into the event description strings.</td></tr>
<tr>
<td><code lang="text">TypesSupported</code></td>
<td>Specifies a bit mask of supported types.</td></tr></tbody></table>
<p>Basically, event sources can be used to classify error messages as
required by the application. For example, you can have sources like
reporting, calculations, user interface, etc for an accounting
application.</p>
<p>We shall see how we configure these values later in the article.</p>
<h3>Event categories</h3>
<p>Categories help organize events so that we can filter them in the
Event Viewer. Each event source can define its own numbered categories,
and the text strings to which they are mapped. The categories must be
numbered consecutively, beginning with the number one. The total number
of categories is stored in the <code lang="text">CategoryCount</code>
key for the event source. Categories can be stored in a separate
message file, or in a file that contains messages of other types. We
shall talk more about creating categories under the section titled
Message Files.</p>
<h3>Event identifiers</h3>
<p>Event identifiers identify a particular event uniquely. Each event
source can define its own numbered events, and the description strings
to which they are mapped. Event viewers present these descriptions
strings to the user.</p>
<h3>Message files</h3>
<p>Message files are text files that contain information about the
various messages and categories that applications want to support.
These text files are then compiled as resource DLLs. Resource DLLs are
small and fast when compared to normal DLLs. The advantage of these
resource DLLs is that we can have messages written in multiple
languages. By using these DLLs, we can have a truly localized
application with localized error messages. Each event source should
register message files that contain description strings for each event
identifier, event category, and parameters. These files are registered
in the <code lang="text">EventMessageFile</code>, <code lang="text">CategoryMessageFile</code>, and <code lang="text">ParameterMessageFile</code>
registry values for the event source. We can create a single message
file that contains descriptions for the event identifiers, categories,
and parameters, or create three separate message files. Several
applications can share the same message file.</p>
<h2>Implementation</h2>
<p>This article so far discussed the concepts behind event logging.
Now, let us consider the implementation aspects with respect to .NET.</p>
<h3>Creating an Event log-file</h3>
<p>There are two ways to create an event log-file:</p>
<ol>
<li>Manually creating the registry entries
<p>This can be done by adding an entry under <code lang="text">HKEY_LOCAL_MACHINE\SYSTEM\Services\EventLog</code>.</p>
</li><li>Programmatically
<p>To create log-files, event sources and also to log events in the event log we use the <code lang="vbnet">EventLog</code> class defined in the <code lang="vbnet">System.Diagnostics</code> namespace.</p><div class="SmallText" id="premain0" style="width: 100%; cursor: pointer;"><img preid="0" src="evtvwr.aspx_files/minus.gif" id="preimg0" width="9" height="9"><span preid="0" style="margin-bottom: 0pt;" id="precollapse0"> Collapse</span></div><pre style="margin-top: 0pt;" id="pre0" lang="vbnet"><span class="code-comment">'</span><span class="code-comment">Create the source, if it does not already exist.
</span>
<span class="code-keyword">If</span> <span class="code-keyword">Not</span> EventLog.SourceExists(<span class="code-string">"</span><span class="code-string">MySource"</span>, <span class="code-string">"</span><span class="code-string">MyServer"</span>) <span class="code-keyword">Then</span>
EventLog.CreateEventSource(<span class="code-string">"</span><span class="code-string">MySource"</span>, <span class="code-string">"</span><span class="code-string">MyApp"</span>, <span class="code-string">"</span><span class="code-string">MyServer"</span>)
<span class="code-keyword">End</span> <span class="code-keyword">If</span></pre>
<p>In the code piece shown above, we are creating an event source called <code lang="vbnet">MySource</code> under <em>MyApp </em>log-file on the machine <em>MyServer</em> if one does not already exist. </p></li></ol>
<h3>Creating event sources</h3>
<p>Event sources can be created manually or programmatically (as shown earlier), similar to <i>Event</i> log-files. If you are creating sources manually, then you have to create several keys such as <code lang="text">CategoryMessageFile</code> and <code lang="text">EventMessageFile</code> under the source. The snapshot given below shows the registry entries after the log-file and event sources are created. </p>
<p><img alt="Event Source Registry Entries" src="evtvwr.aspx_files/Evtvwr3.jpg" width="500" height="98"></p>
<p><b>Figure 3:</b> Event source registry entries</p>
<p>In Figure 3, we have created a log-file for the application called <i>MyApp</i>. Under this log-file, there are two sources <em>MySource1</em> and <em>MySource2</em>. In the example shown above, <em>Msg.dll </em>in the temp directory is used to obtain both messages and category names (as provided for the <code lang="text">CategoryMessageFile</code> and <code lang="text">EventMessageFile</code> entries). The event source has three categories (<code lang="text">CategoryCount</code> is set to 3), and all event types are supported (<code lang="text">TypesSupported</code> is set to 7).</p>
<h3>Message files</h3>
<p>A detailed explanation of message text file syntax is beyond the scope of this document.<!-- However, for more information you can refer: <A
href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/mc_77lf.asp"
target=_blank>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/mc_77lf.asp</A>.--></p>
<p>Given below is a sample message text file:</p><div class="SmallText" id="premain1" style="width: 100%; cursor: pointer;"><img preid="1" src="evtvwr.aspx_files/minus.gif" id="preimg1" width="9" height="9"><span preid="1" style="margin-bottom: 0pt;" id="precollapse1"> Collapse</span></div><pre style="margin-top: 0pt;" id="pre1" lang="text">;//**************Category Definitions************
MessageId=1
Facility=Application
Severity=Success
SymbolicName=CAT1
Language=English
MyCategory1
.
MessageId=2
Facility=Application
Severity=Success
SymbolicName=CAT2
Language=English
MyCategory2
.
;//***********Event Definitions**************
MessageId=1000
Severity=Success
SymbolicName=MSG1
Language=English
My Error Message
.
MessageId=2000
Severity=Success
SymbolicName=GENERIC
Language=English
%1
.</pre>
<p>Note: Message files can be in Unicode to support messages written in
any language. In the example given above, messages are written in
English. The categories and messages have also been provided in the
same file.</p>
<h3>Creating Message DLLs</h3>
<p>We need to compile the message file to a resource-only DLL. The following steps explain the conversion process:</p>
<ol>
<li>Create a <i>.mc</i> file to define the message resource table. This
file has all the error messages and categories of an application. Use
the message compiler to create <i>.rc</i> and <i>.bin</i> files from the <i>.mc</i> file. <div class="SmallText" id="premain2" style="width: 100%; cursor: pointer;"><img preid="2" src="evtvwr.aspx_files/minus.gif" id="preimg2" width="9" height="9"><span preid="2" style="margin-bottom: 0pt;" id="precollapse2"> Collapse</span></div><pre style="margin-top: 0pt;" id="pre2" lang="text"><b>mc </b>filename.mc.</pre>
</li><li>Use the resource compiler to create a <i>.res</i> file. <div class="SmallText" id="premain3" style="width: 100%; cursor: pointer;"><img preid="3" src="evtvwr.aspx_files/minus.gif" id="preimg3" width="9" height="9"><span preid="3" style="margin-bottom: 0pt;" id="precollapse3"> Collapse</span></div><pre style="margin-top: 0pt;" id="pre3" lang="text"><b>rc -r -fo</b> filename.res filename.rc </pre>
</li><li>Use the linker to create a <i>.dll</i> file. <div class="SmallText" id="premain4" style="width: 100%; cursor: pointer;"><img preid="4" src="evtvwr.aspx_files/minus.gif" id="preimg4" width="9" height="9"><span preid="4" style="margin-bottom: 0pt;" id="precollapse4"> Collapse</span></div><pre style="margin-top: 0pt;" id="pre4" lang="text"><b>link -dll -noentry -out</b>:filename.dll filename.res </pre></li></ol>
<h3>Logging an error</h3>
<p>To log an event into the event log, the <code lang="vbnet">WriteEntry</code><strong> </strong>method of the <code lang="vbnet">EventLog</code><strong> </strong>class can be used. Given below is a code snippet detailing how a message can be logged: </p><div class="SmallText" id="premain5" style="width: 100%; cursor: pointer;"><img preid="5" src="evtvwr.aspx_files/minus.gif" id="preimg5" width="9" height="9"><span preid="5" style="margin-bottom: 0pt;" id="precollapse5"> Collapse</span></div><pre style="margin-top: 0pt;" id="pre5" lang="vbnet"><span class="code-keyword">Dim</span> objEventLog <span class="code-keyword">As</span> <span class="code-keyword">New</span> EventLog()
<span class="code-comment">'</span><span class="code-comment">Register the App as an Event Source
</span>
<span class="code-keyword">If</span> <span class="code-keyword">Not</span> objEventLog.SourceExists(<span class="code-string">"</span><span class="code-string">MySource1"</span>) <span class="code-keyword">Then</span>
objEventLog.CreateEventSource(<span class="code-string">"</span><span class="code-string">MySource1"</span>,<span class="code-string">"</span><span class="code-string">MyApp"</span>)
<span class="code-keyword">End</span> <span class="code-keyword">If</span>
objEventLog.Source = <span class="code-string">"</span><span class="code-string">MySource1"</span>
objEventLog.WriteEntry(<span class="code-string">"</span><span class="code-string">"</span>, EventLogEntryType.Error, 1000, <span class="code-keyword">CShort</span>(<span class="code-digit">1</span>))</pre>
<p>For the code sample above, refer to the message text file shown earlier. </p>
<p>Note a couple of things here. We are passing the <code lang="vbnet">EventID</code>
parameter as 1000. This corresponds to the message "My Error Message"
in the message text file. This will be displayed as the message in the
event log. Also, we are passing the <code lang="vbnet">CategoryID</code> as 1. This corresponds to the category of <em>MyCategory1</em>.
Note that I am not passing any error message as this is picked up from
the message file. Figure 4 illustrates how the event log entry would
look like when the above code snippet is executed: </p>
<p><img src="evtvwr.aspx_files/Evtvwr4.jpg" width="500" height="250"></p>
<p><b>Figure 4:</b> An event log entry with the <code lang="vbnet">EventID</code> and <code lang="vbnet">Category</code></p>
<p>We now have our own node in the event viewer. By looking at the
event log, the user gets a fair amount of information like the source
of the error and its category. Not only that, this makes filtering
messages easier as we now have our own Sources and Categories. Also, by
using the same method, we have effectively segregated error messages
from the application code itself. This would help us maintain a uniform
standard for error messages across applications, and also take us a
step closer to localization.</p>
<h3>Providing links in error messages</h3>
<p>Another good feature the Event Viewer provides is that of hyperlinks
in the error messages, which can be linked to a web page detailing more
about the error. This would help an end user understand and troubleshot
the error. For example, the message given below has a link to a web
page:</p>
<p><img src="evtvwr.aspx_files/evtvwr5.jpg" width="279" height="312"></p>
<p><b>Figure 5:</b> Troubleshooting Link given with an Error Message</p>
<p>On clicking this link, we would be prompted with a dialog box as shown below:</p>
<p><img src="evtvwr.aspx_files/Evtvwr6.jpg" width="288" height="154"></p>
<p><b>Figure 6:</b> Posting Error Information to a designated place</p>
<p>When the user confirms to send this information, a web page can be
programmed to receive this information, and display troubleshooting
information to the user based on the <code lang="vbnet">EventID</code>, <code lang="vbnet">Category</code>, and <code lang="vbnet">Source</code> sent from the client (This information is sent as query string parameters).</p>
<h2>Conclusion</h2>
<p>The event viewer definitely provides a wealth of features through
which error messages can be effectively logged and tracked. By
exploiting these features, we would help end users to understand the
errors and their sources better, and this in turn can simplify things
for the support group. </p>
<h3>A note about the source files</h3>
<p>Included with this article is a simple VB.NET project which just shows how the <code lang="vbnet">WriteEntry</code> method of the <code lang="vbnet">EventLog</code> class can be used. The zip also includes a <i>.reg</i>
file which should be run to create the custom log-file and to register
the event sources. Note that some paths are hard coded in the <i>.reg</i> file. So, change them accordingly. Finally, a batch file <i>Compile.bat</i> is included to compile the <i>.mc</i> file to create a message DLL.</p>
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<b><a id="ctl00_AboutAuthorRptr_ctl00_AboutAuthor_memberProfileLink" href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=144339">Manoj G</a></b><br><br>
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<td> I am a software developer and have worked on Microsoft
technologies for about five years now. I have always been fascinated by
Microsoft technologies and with the advent of .NET , this fascination
has reached new heights. I take a lot of interest reading technical
articles and equally enjoy writing them. I really like to be called a
.NET junkie and will surely try to live up to this name <img src="evtvwr.aspx_files/smiley_smile.gif" alt="Smile" align="top"><br><br>I am <b>.NET MVP</b> and have also completed <b>MCAD, MCSD(VS 6), MCDBA (SQL Server 2000), MCSA (Win 2K)</b> and <b> MCTS (Distributed Apps) </b> certfications.<br>
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<h2>Other popular .NET Framework articles:</h2><ul><li><a href="http://www.codeproject.com/KB/dotnet/regextutorial.aspx">The 30 Minute Regex Tutorial</a><div class="SmallText">Learn how to use regular expressions in 30 minutes with Expresso.</div></li><li><a href="http://www.codeproject.com/KB/dotnet/strings.aspx">Strings UNDOCUMENTED</a><div class="SmallText">Detailed looked at the implementation of strings in .NET</div></li><li><a href="http://www.codeproject.com/KB/dotnet/expresso.aspx">Expresso - A Tool for Building and Testing Regular Expressions</a><div class="SmallText">For learning, building, and debugging .NET Framework regular expressions</div></li><li><a href="http://www.codeproject.com/KB/dotnet/mysteriesofconfiguration.aspx">Unraveling the Mysteries of .NET 2.0 Configuration</a><div class="SmallText">Learn how to utilize the powerful new .NET 2.0 configuration features to simplify and centralize your configuration code.</div></li><li><a href="http://www.codeproject.com/KB/dotnet/simplewindowsservice.aspx">Simple Windows Service Sample</a><div class="SmallText">A simple application to show how to create a Windows service.</div></li></ul>
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<td> </td><td>Msgs 1 to 25 of 46 (Total in Forum: 46) (<a href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick">Refresh</a>)</td><td style="text-align: right; white-space: nowrap;"><span class="Frm_HL">First</span><span class="Frm_HL">Prev</span><a class="Frm_HL" name="Frm_HoverNL" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&fr=26#xx0xx">Next</a></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx2276572xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="2276572" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2276572#xx2276572xx">Restart at eventviewer service</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=1861233">AssebRic</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">7:02 17 Oct '07 </td>
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<td colspan="2">If
you're using a source that already exists you should delete from the
previous "store" and put in the new one... this is not a problem...
when i try it a message like this appears:<br><br>"The description for
Event ID ( 1000 ) in Source ( AppSource ) cannot be found. The local
computer may not have the necessary registry information or message DLL
files to display messages from a remote computer. The following
information is part of the event: Generic Message. "<br><br><br>The
solution, for now, is to restart the machine... after this everything
is great..i think that the sources are in memory after windows starts..<br><br>Do you have one simple solution? i need to do this programatically<br><br>thanks and great post <img src="evtvwr.aspx_files/smiley_smile.gif" alt="Smile" align="top"> <br><br><div class="ForumSig">We all need...</div><br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1773025xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1773025" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1773025#xx1773025xx">.Evt File [modified]</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=54353">RadioButton</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">8:01 23 Nov '06 </td>
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<td colspan="2">How
does the CustomLog .Evt file get generated? I have gone as far as using
the EventLogInstaller class. Using Installutil.exe to install my log. <br><br>Thanks so much for the help.<br>RB<br> <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1554680xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1554680" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1554680#xx1554680xx">Logging Source Not Available</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=864684">rodneyhb</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">6:57 29 Jun '06 </td>
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<td colspan="2">I
want to run an application that is extracted by an installer, executed
and removed by the installer upon completion. In this scenario the
source of the messages is not available after the application has
executed. Because of this I get errors in the event viewer stating that
the SOURCE could not be located. Is there a way to log messages to the
event viewer in this scenario? Is there a default SOURCE that I can
use? <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1476596xx"></a><img src="evtvwr.aspx_files/msg_question.gif" alt="Question" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1476596" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1476596#xx1476596xx">Category is not resolved until restart</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=1344454">RomanI</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">5:47 6 May '06 </td>
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<td colspan="2">Category names is not resolved until restart. And displayed as "(1)".<br>Please let help somebody who overcome this problem. <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1387413xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1387413" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1387413#xx1387413xx">How can I log the user in the Event Log message?</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=25061">Angel_Komarov</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">15:20 27 Feb '06 </td>
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<td colspan="2">In Figures 4,5 in your article the user is marked as N/A. Is there a way to show the actual program’s user name there? <br><br>ak<br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx2288995xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="2288995" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2288995#xx2288995xx">Re: How can I log the user in the Event Log message?</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=537461">m_p_1971</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">11:23 25 Oct '07 </td>
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<td colspan="2">A solution would be using Win32 ReportEvent. Couldn't find anything in .NET. Hope it helps. <br></td>
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<td colspan="2">Hello<br><br>I has problems using the object EventLog. When I read the object the EventId does not correspond with the real log.<br>The object retourn 3221226502 and it souhld be 1030.<br>Could be an error in my code or a bug?<br><br>Thanks!<br><br>Here is my code<br><br> Dim myNewLog As New EventLog()<br> 'Set type of log (system, security, application)<br> myNewLog.Log = type_log.ToString 'Application<br> Dim entry As EventLogEntry<br> Dim i As Integer = 0<br> Dim HasData As Boolean = False<br> ReDim ValuesLog(0)<br><br> 'Shearch information for the Log <br> For Each entry In myNewLog.Entries<br><br> ReDim Preserve ValuesLog(i)<br> ValuesLog(i) = New String(7) {"", "", "", "", "", "", "", ""}<br> 'Check the last time of execution and takes the new ones for don't repeat this information in the DB<br> If lasttime <= entry.TimeGenerated Then<br><br> HasData = True<br> ReDim Preserve ValuesOS(UBound(ValuesOS, 1))(4)<br> 'insert Information for each Field<br> ValuesLog(i)(0) = entry.EntryType<br> ValuesLog(i)(1) = Format(CDate(entry.TimeGenerated), "yyyy-MM-dd H:mm:ss")<br> ValuesLog(i)(2) = entry.Source<br><br> ValuesLog(i)(3) = entry.Category<br> ValuesLog(i)(4) = entry.EventID<br> ValuesLog(i)(4) = entry.InstanceId.ToString<br><br> If entry.UserName = "" Then<br> ValuesLog(i)(5) = "N/A"<br> Else<br> ValuesLog(i)(5) = entry.UserName<br> End If<br><br> ValuesLog(i)(6) = entry.MachineName<br> ValuesLog(i)(7) = entry.Message<br> i = i + 1<br> End If<br> Next entry <br><br>Hernan Alonso<br><br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx2055792xx"></a><img src="evtvwr.aspx_files/msg_answer.gif" alt="Answer" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="2055792" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2055792#xx2055792xx">Re: Problem with Event Id</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=4174342">Raul Jose</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">19:09 27 May '07 </td>
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<td colspan="2">hi Hernan<br>I am also facing the same problem.<br>Actually, I am not able to find the solution.<br>I see, that you posted it last year.<br><br>I wanna ask, whether you've find the solution?<br><br>If yes, then please help me out... how to get the actual event id<br><br>(the only work-around i could get was...<br>. get that 10 digit number and convert it to binary...<br>. trim the binary number and store only last 16 bits.<br>. again convert those 16-bit number in decimal.<br>we get the required number shown in event viewer...)<br><br>but the main problem arives when I've to search the eventlog entries<br>quering on the basis of event id.<br>(I think need to get 10-digit number from 4 digit number here... but how?)<br><br>let me know if you get the solution.<br><br>Thanks<br>Raul <br></td>
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<td class="Frm_MsgIndent" width="52"><a name="xx2069148xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="2069148" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2069148#xx2069148xx">Re: Problem with Event Id</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=4205791">Anna Ellis</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">2:26 6 Jun '07 </td>
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<td colspan="2">Raul,<br><br>Taking as an example:<br><br>MSSQLSERVER Server Event ID 3221229486 <br><br>This = Error 4014 <br><br>3221229486 converted to binary = 11000000000000000000111110101110 (Qword/Dword)<br>11000000000000000000111110101110 reduces to binary 111110101110 (Word)<br>111110101110 converts to decimal 4014.<br><br>To reverse:<br><br>4014 converts to 111110101110 binary (Word)<br>Add 11000000000000000000000000000000 (32 digits, Qword/Dword)<br>This gives 11000000000000000000111110101110 which converts to decimal 3221229486<br><br>HTH<br><br>Anna <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1245034xx"></a><img src="evtvwr.aspx_files/msg_question.gif" alt="Question" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1245034" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1245034#xx1245034xx">Help with the hyperlinks</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=154017">David Hoyt</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">12:12 4 Oct '05 </td>
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<td colspan="2">Could
you please post how you created a hyperlink in the event log message? I
tried using just a hyperlink, RTF, hyperlinks with anchor tags, etc.
and I got nothing. Please help! Other people have asked and you have
remained silent. Thanks for helping out! (c: <br></td>
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<td colspan="2">Hello Manoj G<br><br>Sorry for my english,I readed your article is much interesting! <br><br>I check to the EventLog Class in .NET,I can delete all Entrys at one Event Log but...<br>Who can I delete one Entry in one specific event Log?<br><br>Tank's. <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1033806xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1033806" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1033806#xx1033806xx">Category is always showing (1)</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/usersuss.gif" alt="suss" width="14" height="15"></td><td class="Frm_MsgAuthor">Anonymous</td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">19:10 7 Feb '05 </td>
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<td colspan="2">When I tried to an write to into eventlog everything is coming fine except the category. It is showing (1). How can I solve it. <br></td>
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<td colspan="2">Had
exactly the same problem but it was because the source wasn't pointing
to the dll correctly. The screenshots above show the registry keys
being added under MySource2 but then all the code references MySource1.
Just duplicate the reg keys under all the sources and it works fine. <br><br>Great article by the way. <br></td>
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<td colspan="2">You mention that you can add a link in the error message. How do you go about doing this?<br><br>Thanks,<img src="evtvwr.aspx_files/smiley_biggrin.gif" alt="Big Grin" align="top"> <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx975439xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="975439" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=975439#xx975439xx">Query the Event Viewer</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/usersuss.gif" alt="suss" width="14" height="15"></td><td class="Frm_MsgAuthor">Anonymous</td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">12:34 17 Nov '04 </td>
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<td colspan="2"><img src="evtvwr.aspx_files/smiley_smile.gif" alt="Smile" align="top">Hi all,<br>I
was looking at the Event Viewer, but there are too many event logs, i
thought it would be a good idea somehow we can query and search for a
particular word or error. Any ideas?? <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx900676xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="900676" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=900676#xx900676xx">Hyperlinks in the error messages</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=635461">Christian Eriksen</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">16:50 17 Aug '04 </td>
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<td colspan="2"><br>You mentioned in your <b>excellent</b>
article the Event Viewer's feature of providing hyperlinks in error
messages. Do you know the syntax that aplies to the messagestring in
order to display a hyperlink?<br><br>objEventLog.WriteEntry(strWithHyperlink, EventLogEntryType.Error, 1000, CShort(1))<br><br>Thanks,<br>Christian<br> <br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx981025xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="981025" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=981025#xx981025xx">Re: Hyperlinks in the error messages</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/usersuss.gif" alt="suss" width="14" height="15"></td><td class="Frm_MsgAuthor">BuddyWork</td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">22:29 24 Nov '04 </td>
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<td colspan="2">Did you work out how to do this?<big><img src="evtvwr.aspx_files/smiley_biggrin.gif" alt="Big Grin" align="top"></big> <br></td>
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<td colspan="2">Dis anyone get the hyper-links to work? <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx865646xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="865646" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=865646#xx865646xx">How to customize the event viewer?</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/usersuss.gif" alt="suss" width="14" height="15"></td><td class="Frm_MsgAuthor">Anonymous</td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">10:56 1 Jul '04 </td>
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<td colspan="2">This
is a great article, however, I was wondering if you guys can help me
with a related issue. I would like the event viewer snap-in to display
only my custom log, without Application, security, etc.<br><br>Any one knows how to do that?<br><br>Thanks,<br><br>Omer <br></td>
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<td colspan="2">It's simple <img src="evtvwr.aspx_files/smiley_smile.gif" alt="Smile" align="top"><br><br>1. Run mmc.exe<br>2. In the mmc select File\Add Remove Snap-in. That will open the "Add Remove Snap-in" dialog. Add the Event Viewer snap-in.<br>3.
Close the dialog and you'll have the event viewer snap-in open. Right
click your custom log node and select "New window from here". It will
open another window with just your custom log node. Now you can close
the old snap-in window.<br>4. Optional. Select File\Options and in the
Options dialog you can set a name for your mmc file and change the file
icon. You can also change the Console Mode to "User mode - limited
access, single window".<br>5. Save your console to a msc file. <br> <br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx929565xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="929565" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=929565#xx929565xx">Re: How to customize the event viewer?</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/usersuss.gif" alt="suss" width="14" height="15"></td><td class="Frm_MsgAuthor">Alin I</td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">23:18 20 Sep '04 </td>
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<td colspan="2">It's simple <img src="evtvwr.aspx_files/smiley_smile.gif" alt="Smile" align="top"><br><br>1. Run mmc.exe<br>2. In the mmc select File\Add Remove Snap-in. That will open the "Add Remove Snap-in" dialog. Add the Event Viewer snap-in.<br>3.
Close the dialog and you'll have the event viewer snap-in open. Right
click your custom log node and select "New window from here". It will
open another window with just your custom log node. Now you can close
the old snap-in window.<br>4. Optional. Select File\Options and in the
Options dialog you can set a name for your mmc file and change the file
icon. You can also change the Console Mode to "User mode - limited
access, single window".<br>5. Save your console to a msc file. <br> <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx838210xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="838210" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=838210#xx838210xx">TypesSupported confusion</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=34782">Alois Kraus</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">2:56 1 Jun '04 </td>
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<td colspan="2">I am confused how many message types (severities) one dll can support. <br>The .h generated by mc.exe for a mc file claims:<br><br><code>//<br>// 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1<br>// 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0<br>// +---+-+-+-----------------------+-------------------------------+<br>// |Sev|C|R| Facility | Code |<br>// +---+-+-+-----------------------+-------------------------------+<br>//<br>// where<br>//<br>// Sev - is the severity code<br>//<br>// 00 - Success<br>// 01 - Informational<br>// 10 - Warning<br>// 11 - Error<br></code><br><br>There are 2 Bits for severity reserved therefore I can have 4 message types.<br>But if I look into MSDN for the registry key TypesSupported:<br><br>Bitmask value Meaning <br>0 Success <br>1 Error <br>10 binary (2) Warning <br>100 binary (4) Information <br>1000 binary (8) Success audit <br>10000 binary (16) Failure audit <br><br>This value holds 6 Bits!<br><br>I do not see a way how 6 types can be mapped into 2 bits.<br>The .mc input files have to enumerate the supported severities from zero.<br>e.g <br>SeverityNames=(Success=0x0:STATUS_SEVERITY_SUCCESS<br> Informational=0x1:STATUS_SEVERITY_INFORMATIONAL<br> Warning=0x2:STATUS_SEVERITY_WARNING<br> Error=0x3:STATUS_SEVERITY_ERROR<br> )<br><br>This definition looks like an arbitrary number of types can be supported.<br>I do not know how this enumeration values are mapped to whatever bitfield<br>in the resource dll. <br><br>This looks very inconsistent to me.<br><br><br> <br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx875268xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="875268" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=875268#xx875268xx">Re: TypesSupported confusion</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=34782">Alois Kraus</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">3:27 14 Jul '04 </td>
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<td colspan="2">I found that in the ReportEvent API function the second parameter<br>specified the event type. The eventid can be independently supplied.<br>This means that the logged event does not nescessarily needs to have<br>the severity specified in the .MC file.<br> <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx828330xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="828330" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=828330#xx828330xx">Link provide in article not working</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/usersuss.gif" alt="suss" width="14" height="15"></td><td class="Frm_MsgAuthor">Anonymous</td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">8:20 20 May '04 </td>
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<td colspan="2">Excellent work. <br>Can you please take a look at the link you provided in article.<br>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/mc_77lf.asp.<br><br>Doesn't seem to work for me. <br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx865500xx"></a><img src="evtvwr.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="865500" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=865500#xx865500xx">Re: Link provide in article not working</a></td><td style="width: 20px; white-space: nowrap;"><img src="evtvwr.aspx_files/member_sm.gif" title="member" alt="member" border="0" height="16"></td><td class="Frm_MsgAuthor"><a href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=126694">Matt Casto</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">7:54 1 Jul '04 </td>
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<td colspan="2">I think the following link is the correct URL.<br><br><a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/tools/message_text_files.asp">http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/tools/message_text_files.asp</a>[<a target="_blank" title="New Window" href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/tools/message_text_files.asp">^</a>] <br></td>
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<td>Last Visit: 10:25 6 Mar '09 Last Update: 10:25 6 Mar '09 </td><td style="text-align: right; white-space: nowrap;"><b>1</b> <a class="Frm_HL" name="Frm_HoverNL" href="http://www.codeproject.com/KB/dotnet/evtvwr.aspx?fid=15511&df=90&mpp=25&noise=3&sort=Position&view=Quick&fr=26#xx0xx">Next »</a></td>
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