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<h1><span id="ctl00_ArticleTopHeader_ArticleTitle" class="ArticleTopTitle">Adding User Name to Events</span></h1>
<b>By <a href="http://www.codeproject.com/script/Articles/MemberArticles.aspx?amid=661994">maththaios</a></b><br>
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<span id="ctl00_ArticleTopHeader_ArticleDescr">How to add user names to the Event Viewer.</span>
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<tbody><tr><td>Posted:</td><td><b>22 Feb 2006</b></td></tr>
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<!-- Main Page Contents Start -->
<!-- Article Starts -->
<p><img alt="The Event Viewer" src="EventView.aspx_files/EventView.GIF" width="578" height="316"></p>
<h2>Introduction</h2>
<p>This article will explain how to add a user name to the Events that are logged in to the Event Viewer.</p>
<h2>Background</h2>
<p>I needed to add user names to events that were being logged, and I
could not find anything directly on target. Microsoft's website stated
to simply add the SID to the <code>ReportEvent</code> function. It did
not tell how to get the SID. After much more investigation, I found
something written in another programming language that got the user
SID, so I translated it into C and combined it with what I was doing.</p>
<h2>Using the code</h2>
<p>I wrote a standalone program first to test out what I wanted to do
at work. I will provide all the relevant portions here so that you can
simply paste into your project something that works.</p><div class="SmallText" id="premain0" style="width: 100%; cursor: pointer;"><img preid="0" src="EventView.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"> HANDLE hToken;
HANDLE g_eventHandle = NULL;
<span class="code-keyword">int</span> rc;
DWORD dwLength = <span class="code-digit">0</span>;
PTOKEN_USER pTokenUser = NULL;
TCHAR *params[<span class="code-digit">1</span>];
<span class="code-comment">//</span><span class="code-comment"> in order to use ReportEvent we must first Register Event
</span>
g_eventHandle = RegisterEventSource(NULL, _T(<span class="code-string">"</span><span class="code-string">SID_TEST"</span>));
OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken);
<span class="code-comment">//</span><span class="code-comment"> Get required buffer size and allocate the PTOKEN_USER buffer.
</span>
<span class="code-keyword">if</span> (!GetTokenInformation(
hToken, <span class="code-comment">//</span><span class="code-comment"> handle to the access token
</span>
TokenUser, <span class="code-comment">//</span><span class="code-comment"> get information about the token's groups
</span>
(LPVOID) pTokenUser, <span class="code-comment">//</span><span class="code-comment"> pointer to TOKEN_USER buffer
</span>
<span class="code-digit">0</span>, <span class="code-comment">//</span><span class="code-comment"> size of buffer
</span>
&dwLength <span class="code-comment">//</span><span class="code-comment"> receives required buffer size
</span>
))
{
<span class="code-keyword">if</span> (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
<span class="code-keyword">goto</span> Cleanup;
pTokenUser = (PTOKEN_USER)HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY, dwLength);
<span class="code-keyword">if</span> (pTokenUser == NULL)
<span class="code-keyword">goto</span> Cleanup;
}
<span class="code-comment">//</span><span class="code-comment"> Get the token group information from the access token.
</span>
<span class="code-keyword">if</span> (!GetTokenInformation(
hToken, <span class="code-comment">//</span><span class="code-comment"> handle to the access token
</span>
TokenUser, <span class="code-comment">//</span><span class="code-comment"> get information about the token's groups
</span>
(LPVOID) pTokenUser, <span class="code-comment">//</span><span class="code-comment"> pointer to TOKEN_USER buffer
</span>
dwLength, <span class="code-comment">//</span><span class="code-comment"> size of buffer
</span>
&dwLength <span class="code-comment">//</span><span class="code-comment"> receives required buffer size
</span>
))
{
<span class="code-keyword">goto</span> Cleanup;
}
params[<span class="code-digit">0</span>] = <span class="code-keyword">const_cast</span><span class="code-keyword"><</span>TCHAR*<span class="code-keyword">></span>(<span class="code-string">"</span><span class="code-string">test string"</span>);
<span class="code-comment">//</span><span class="code-comment"> the actual call that places the event into the Event Viewer
</span>
rc = ReportEvent(g_eventHandle, EVENTLOG_INFORMATION_TYPE, <span class="code-digit">0</span>, <span class="code-digit">0</span>,
pTokenUser-<span class="code-keyword">></span>User.Sid,<span class="code-comment">//</span><span class="code-comment"> the sid goes here <-------
</span>
<span class="code-digit">1</span>, <span class="code-digit">0</span>, (LPCTSTR *)params, NULL);
Cleanup:
<span class="code-comment">//</span><span class="code-comment"> Free the buffer for the token .
</span>
<span class="code-keyword">if</span> (pTokenUser != NULL)
HeapFree(GetProcessHeap(), <span class="code-digit">0</span>, (LPVOID)pTokenUser);
<span class="code-comment">//</span><span class="code-comment"> i am finished with the Event
</span>
DeregisterEventSource(g_eventHandle);</pre>
<h2>Points of Interest</h2>
<p>That's all there is to it. The <code>GetTokenInformation</code> function has to be called twice; if you have too much or too little allocated for your SID, the function will fail.</p>
<p>The Event View with our entry:</p>
<p><img alt="The Event Viewer" src="EventView.aspx_files/EventView2.GIF" width="577" height="390"></p>
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<h2>License</h2>
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<h2>About the Author</h2>
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<b><a id="ctl00_AboutAuthorRptr_ctl00_AboutAuthor_memberProfileLink" href="http://www.codeproject.com/script/Membership/Profiles.aspx?mid=661994">maththaios</a></b><br><br>
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I am a computer programmer in Florida.<br>
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<td> </td><td>Msgs 1 to 5 of 5 (Total in Forum: 5) (<a href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&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><span class="Frm_HL">Next</span></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx2480096xx"></a><img src="EventView.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="2480096" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2480096#xx2480096xx">Nice example but do you have vb.net version.</a></td><td style="width: 20px; white-space: nowrap;"><img src="EventView.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=4911548">Member 4911548</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">17:31 25 Mar '08 </td>
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<td colspan="2">hi, i using vb.net windows application. Can you help me translate to vb.net version? Many thanks for you. <br><br><div class="ForumMod">modified on Tuesday, March 25, 2008 11:14 PM</div><br></td>
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<td class="Frm_MsgFt"><a class="Frm_MHL" href="http://www.codeproject.com/script/Membership/LogOn.aspx?rp=%2fKB%2fwinsdk%2fEventView.aspx%3ffid%3d271767%26df%3d90%26mpp%3d25%26noise%3d3%26sort%3dPosition%26view%3dQuick">Sign In</a>·<a class="Frm_MHL" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&sort=Position&tid=2480096" title="View Thread">View Thread</a>·<a class="Frm_MHL" href="http://www.codeproject.com/script/Forums/View.aspx?fid=271767&msg=2480096" title="Get permanent link">PermaLink</a></td><td class="Frm_MsgFt" style="text-align: right;"><span id="MVF2480096" style="white-space: nowrap;"></span></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1446862xx"></a><img src="EventView.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1446862" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1446862#xx1446862xx">What about using LookupAccountName ?</a></td><td style="width: 20px; white-space: nowrap;"><img src="EventView.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=2903095">lumoryel</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">5:22 12 Apr '06 </td>
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<td colspan="2">Hi there !<br><br>I
found another possibility to get the SID of a certain user. I'm calling
GetUserName() (which returns the username of the current thread) and
put the username into LookupAccountName(). This returns the SID for
this user.<br><br><code><br>bool __fastcall
CreateEventLogEntry(AnsiString source, AnsiString message, WORD
event_type, BYTE * data, int data_size, DWORD event_id)<br>{<br><br> HANDLE g_eventHandle = NULL;<br> TCHAR *params[1];<br><br> message = "\n\n" + message + "\n\n";<br> params[0] = message.c_str();<br><br> g_eventHandle = RegisterEventSource(NULL, source.c_str());<br> if(g_eventHandle==NULL)<br> {<br> ShowMessage("CreateEventLogEntry: RegisterEventSource() Failed !");<br> return false;<br> }<br><br> TCHAR lpBuffer[100];<br> unsigned long size = 100;<br><br> if(!GetUserName(lpBuffer, &size))<br> {<br> ShowMessage("CreateEventLogEntry: GetUserName() Failed !");<br> DeregisterEventSource(g_eventHandle);<br> return false;<br> }<br><br> SID Sid;<br> DWORD Sid_Size = 28;<br> TCHAR ReferencedDomainName[100];<br> DWORD DomainName_Size = 100;<br> SID_NAME_USE snu = SidTypeUser;<br><br> if(!LookupAccountName(NULL,<br> lpBuffer,<br> &Sid,<br> &Sid_Size,<br> ReferencedDomainName,<br> &DomainName_Size,<br> &snu))<br> {<br> ShowMessage("CreateEventLogEntry: LookUpAccountName() Failed !");<br> DeregisterEventSource(g_eventHandle);<br> return false;<br> }<br><br> if(!ReportEvent(g_eventHandle, event_type, 0, event_id,<br> &Sid, 1, data_size, (LPCTSTR *)params, data))<br> {<br> ShowMessage("CreateEventLogEntry: ReportEvent() Failed !");<br> DeregisterEventSource(g_eventHandle);<br> return false;<br> }<br><br> DeregisterEventSource(g_eventHandle);<br><br> return true;<br>}<br></code><br></td>
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<td class="Frm_MsgFt"><a class="Frm_MHL" href="http://www.codeproject.com/script/Membership/LogOn.aspx?rp=%2fKB%2fwinsdk%2fEventView.aspx%3ffid%3d271767%26df%3d90%26mpp%3d25%26noise%3d3%26sort%3dPosition%26view%3dQuick">Sign In</a>·<a class="Frm_MHL" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&sort=Position&tid=1446862" title="View Thread">View Thread</a>·<a class="Frm_MHL" href="http://www.codeproject.com/script/Forums/View.aspx?fid=271767&msg=1446862" title="Get permanent link">PermaLink</a></td><td class="Frm_MsgFt" style="text-align: right;"><span id="MVF1446862" style="white-space: nowrap;"></span></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx1447008xx"></a><img src="EventView.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1447008" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1447008#xx1447008xx">Re: What about using LookupAccountName ?</a></td><td style="width: 20px; white-space: nowrap;"><img src="EventView.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=661994">maththaios</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">6:26 12 Apr '06 </td>
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<td colspan="2">I
tried this code and I found 2 things. 1st, My IDE (Visual Studio)
reported at the end of the function that the stack around the variable
Sid was corrupted. 2nd the user name, for some reason, did not show in
the event viewer. I was able to fix the stack corruption by changing
SID to PSID and calling LookupAccountName twice. The first time with
Sid_Size == 0, the Sid_Size is then set by this function so that PSID
can be dynamically allocated, the second call fills out the sid
proberly. I am not sure why the user name is not showing up in the
event viewer. But I will continue to investigate. <br></td>
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<td class="Frm_MsgIndent" width="16"><a name="xx1395426xx"></a><img src="EventView.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1395426" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1395426#xx1395426xx">Nice but i have a question</a></td><td style="width: 20px; white-space: nowrap;"><img src="EventView.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=61934">nesculcas</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">1:23 6 Mar '06 </td>
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<td colspan="2">Hello, <br><br>This
is interesting, I always wonder why my desriptions on event viewer
never appear only like the message i wrote, it always preceded some
text telling that the source was not valid or something like that. But
now i try your code and once again there's a preceding text... only the
difference it's now different the contents <img src="EventView.aspx_files/smiley_tongue.gif" alt="Poke tongue" align="top"> <br><br>My question is why in my teste de description tells this: (note i use the source text 'teste' and event id=0)<br><br>The
description for Event ID ( 0 ) in Source ( teste ) cannot be found. The
local computer may not have the necessary registry information or
message DLL files to display messages from a remote computer. You may
be able to use the /AUXSOURCE= flag to retrieve this description; see
Help and Support for details<br><br>Thanks <br><br>Nuno<br></td>
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<td class="Frm_MsgIndent" width="34"><a name="xx1396115xx"></a><img src="EventView.aspx_files/msg_general.gif" alt="General" width="16" align="top" height="16"></td><td class="Frm_MsgSubject"><a id="DynMessLink" name="1396115" href="http://www.codeproject.com/KB/winsdk/EventView.aspx?fid=271767&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=1396115#xx1396115xx">Re: Nice but i have a question</a></td><td style="width: 20px; white-space: nowrap;"><img src="EventView.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=661994">maththaios</a></td><td class="Frm_MsgDate" style="vertical-align: top; white-space: nowrap;">10:04 6 Mar '06 </td>
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<td colspan="2">if
I understand your question, so seem to be having a problem with the
message itself, and not in reguards to adding the user name to the
message. I did a search on The Code Project for the ReportEvent
function, and this one,
http://www.codeproject.com/system/xeventlog.asp, seems to be on target
for the problems you are having. I hope this helps.<br>Matt <br></td>
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<td>Last Visit: 9:27 4 Mar '09 Last Update: 9:27 4 Mar '09 </td><td style="text-align: right; white-space: nowrap;"></td>
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