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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>TStreamable class Reference</title>
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<a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="classes.html">Alphabetical List</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Compound Members</a> <a class="qindex" href="globals.html">File Members</a> </center>
<hr><h1>TStreamable Class Reference</h1>Gives the streamable property to a class.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="tobjstrm_8h-source.html">tobjstrm.h</a>></code>
<p>
<p>Inheritance diagram for TStreamable::
<p><center><img src="classTStreamable.gif" usemap="#TStreamable_map" border="0"></center>
<map name="TStreamable_map">
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<area href="classTHelpTopic.html" alt="THelpTopic" shape="rect" coords="274,56,401,80">
<area href="classTStringList.html" alt="TStringList" shape="rect" coords="411,56,538,80">
<area href="classTStrListMaker.html" alt="TStrListMaker" shape="rect" coords="548,56,675,80">
<area href="classTValidator.html" alt="TValidator" shape="rect" coords="685,56,812,80">
<area href="classTView.html" alt="TView" shape="rect" coords="959,56,1086,80">
<area href="classTDirCollection.html" alt="TDirCollection" shape="rect" coords="137,112,264,136">
<area href="classTSortedCollection.html" alt="TSortedCollection" shape="rect" coords="137,168,264,192">
<area href="classTFilterValidator.html" alt="TFilterValidator" shape="rect" coords="822,112,949,136">
<area href="classTLookupValidator.html" alt="TLookupValidator" shape="rect" coords="822,168,949,192">
<area href="classTPXPictureValidator.html" alt="TPXPictureValidator" shape="rect" coords="822,224,949,248">
<area href="classTBackground.html" alt="TBackground" shape="rect" coords="1096,112,1223,136">
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<a href="classTStreamable-members.html">List of all members.</a><table border=0 cellpadding=0 cellspacing=0>
<tr><td colspan=2><br><h2>Protected Methods</h2></td></tr>
<tr><td nowrap align=right valign=top>virtual void* </td><td valign=bottom><a class="el" href="classTStreamable.html#b0">read</a> (<a class="el" href="classipstream.html">ipstream</a> &is)=0</td></tr>
<tr><td nowrap align=right valign=top>virtual void </td><td valign=bottom><a class="el" href="classTStreamable.html#b1">write</a> (<a class="el" href="classopstream.html">opstream</a> &os)=0</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Gives the streamable property to a class.
<p>
<a class="el" href="classTView.html">TView</a> has two base classes, <a class="el" href="classTObject.html">TObject</a> and the abstract class TStreamable. All the viewable classes, derived ultimately from <a class="el" href="classTView.html">TView</a>, therefore also inherit from TStreamable.
<p>
Several non-view classes, such as <a class="el" href="classTCollection.html">TCollection</a>, <a class="el" href="classTStrListMaker.html">TStrListMaker</a> and <a class="el" href="classTStringList.html">TStringList</a>, also have TStreamable as a base class. Such classes are known as streamable, meaning that their objects can be written to and read from streams using the TVision stream manager.
<p>
If you want to develop your own streamable classes, make sure that TStreamable is somewhere in their ancestry. Using an existing streamable class as a base class, of course, is an obvious way of achieving this.
<p>
Since TStreamable is an abstract class, no objects of this class can be instantiated. Before a streamable class can be used with streams, the class must override the three pure virtual functions streamableName(), <a class="el" href="classTStreamable.html#b0">read</a>(), and <a class="el" href="classTStreamable.html#b1">write</a>().
<p>
<p>
Definition at line <a class="el" href="tobjstrm_8h-source.html#l00080">80</a> of file <a class="el" href="tobjstrm_8h-source.html">tobjstrm.h</a>.<hr><h2>Member Function Documentation</h2>
<a name="b0" doxytag="TStreamable::read"></a><p>
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void * TStreamable::read (
</b></td>
<td valign="bottom"><b>
<a class="el" href="classipstream.html">ipstream</a> & <em>is</em> )<code> [protected, pure virtual]</code>
</b></td>
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<p>
This pure virtual function must be overridden (or redeclared as pure virtual) in every derived class. The overriding <a class="el" href="classTStreamable.html#b0">read</a>() function for each streamable class must read the necessary data members from the <a class="el" href="classipstream.html">ipstream</a> object `is'. <a class="el" href="classTStreamable.html#b0">read</a>() is usually implemented by calling the base class's <a class="el" href="classTStreamable.html#b0">read</a>() (if any), then extracting any additional data members for the derived class.
<p>
Reimplemented in <a class="el" href="classTBackground.html#b2">TBackground</a>, <a class="el" href="classTColorSelector.html#b2">TColorSelector</a>, <a class="el" href="classTColorDisplay.html#b2">TColorDisplay</a>, <a class="el" href="classTColorGroupList.html#b2">TColorGroupList</a>, <a class="el" href="classTColorDialog.html#b2">TColorDialog</a>, <a class="el" href="classTInputLine.html#b2">TInputLine</a>, <a class="el" href="classTButton.html#b2">TButton</a>, <a class="el" href="classTCluster.html#b2">TCluster</a>, <a class="el" href="classTMultiCheckBoxes.html#b2">TMultiCheckBoxes</a>, <a class="el" href="classTListBox.html#b2">TListBox</a>, <a class="el" href="classTStaticText.html#b2">TStaticText</a>, <a class="el" href="classTParamText.html#b2">TParamText</a>, <a class="el" href="classTLabel.html#b2">TLabel</a>, <a class="el" href="classTHistory.html#b2">THistory</a>, <a class="el" href="classTEditor.html#b2">TEditor</a>, <a class="el" href="classTMemo.html#b2">TMemo</a>, <a class="el" href="classTFileEditor.html#b2">TFileEditor</a>, <a class="el" href="classTEditWindow.html#b2">TEditWindow</a>, <a class="el" href="classTHelpTopic.html#b1">THelpTopic</a>, <a class="el" href="classTHelpIndex.html#b1">THelpIndex</a>, <a class="el" href="classTMenuView.html#b2">TMenuView</a>, <a class="el" href="classTStatusLine.html#b2">TStatusLine</a>, <a class="el" href="classTCollection.html#b1">TCollection</a>, <a class="el" href="classTSortedCollection.html#b1">TSortedCollection</a>, <a class="el" href="classTOutlineViewer.html#b1">TOutlineViewer</a>, <a class="el" href="classTOutline.html#b1">TOutline</a>, <a class="el" href="classTStringList.html#b2">TStringList</a>, <a class="el" href="classTStrListMaker.html#b2">TStrListMaker</a>, <a class="el" href="classTSortedListBox.html#a3">TSortedListBox</a>, <a class="el" href="classTFileDialog.html#b2">TFileDialog</a>, <a class="el" href="classTChDirDialog.html#b2">TChDirDialog</a>, <a class="el" href="classTValidator.html#b2">TValidator</a>, <a class="el" href="classTPXPictureValidator.html#b2">TPXPictureValidator</a>, <a class="el" href="classTFilterValidator.html#b2">TFilterValidator</a>, <a class="el" href="classTRangeValidator.html#b2">TRangeValidator</a>, <a class="el" href="classTStringLookupValidator.html#b2">TStringLookupValidator</a>, <a class="el" href="classTView.html#b2">TView</a>, <a class="el" href="classTScrollBar.html#b2">TScrollBar</a>, <a class="el" href="classTScroller.html#b2">TScroller</a>, <a class="el" href="classTListViewer.html#b2">TListViewer</a>, <a class="el" href="classTGroup.html#b2">TGroup</a>, and <a class="el" href="classTWindow.html#b2">TWindow</a>. </td>
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<a name="b1" doxytag="TStreamable::write"></a><p>
<table width="100%" cellpadding="2" cellspacing="0" border="0">
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void TStreamable::write (
</b></td>
<td valign="bottom"><b>
<a class="el" href="classopstream.html">opstream</a> & <em>os</em> )<code> [protected, pure virtual]</code>
</b></td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<p>
This pure virtual function must be overridden (or redeclared as pure virtual) in every derived class. The overriding <a class="el" href="classTStreamable.html#b1">write</a>() function for each streamable class must write the necessary data members to the <a class="el" href="classopstream.html">opstream</a> object `os'. <a class="el" href="classTStreamable.html#b1">write</a>() is usually implemented by calling the base class's <a class="el" href="classTStreamable.html#b1">write</a>() (if any), then inserting any additional data members for the derived class.
<p>
Reimplemented in <a class="el" href="classTBackground.html#b1">TBackground</a>, <a class="el" href="classTColorSelector.html#b1">TColorSelector</a>, <a class="el" href="classTColorDisplay.html#b1">TColorDisplay</a>, <a class="el" href="classTColorGroupList.html#b1">TColorGroupList</a>, <a class="el" href="classTColorDialog.html#b1">TColorDialog</a>, <a class="el" href="classTInputLine.html#b1">TInputLine</a>, <a class="el" href="classTButton.html#b1">TButton</a>, <a class="el" href="classTCluster.html#b1">TCluster</a>, <a class="el" href="classTMultiCheckBoxes.html#b1">TMultiCheckBoxes</a>, <a class="el" href="classTListBox.html#b1">TListBox</a>, <a class="el" href="classTStaticText.html#b1">TStaticText</a>, <a class="el" href="classTParamText.html#b1">TParamText</a>, <a class="el" href="classTLabel.html#b1">TLabel</a>, <a class="el" href="classTHistory.html#b1">THistory</a>, <a class="el" href="classTEditor.html#b1">TEditor</a>, <a class="el" href="classTMemo.html#b1">TMemo</a>, <a class="el" href="classTFileEditor.html#b1">TFileEditor</a>, <a class="el" href="classTEditWindow.html#b1">TEditWindow</a>, <a class="el" href="classTHelpTopic.html#b0">THelpTopic</a>, <a class="el" href="classTHelpIndex.html#b0">THelpIndex</a>, <a class="el" href="classTMenuView.html#b1">TMenuView</a>, <a class="el" href="classTStatusLine.html#b1">TStatusLine</a>, <a class="el" href="classTCollection.html#b2">TCollection</a>, <a class="el" href="classTSortedCollection.html#b2">TSortedCollection</a>, <a class="el" href="classTOutlineViewer.html#b0">TOutlineViewer</a>, <a class="el" href="classTOutline.html#b0">TOutline</a>, <a class="el" href="classTStringList.html#b1">TStringList</a>, <a class="el" href="classTStrListMaker.html#b1">TStrListMaker</a>, <a class="el" href="classTFileDialog.html#b1">TFileDialog</a>, <a class="el" href="classTChDirDialog.html#b1">TChDirDialog</a>, <a class="el" href="classTValidator.html#b1">TValidator</a>, <a class="el" href="classTPXPictureValidator.html#b1">TPXPictureValidator</a>, <a class="el" href="classTFilterValidator.html#b1">TFilterValidator</a>, <a class="el" href="classTRangeValidator.html#b1">TRangeValidator</a>, <a class="el" href="classTStringLookupValidator.html#b1">TStringLookupValidator</a>, <a class="el" href="classTView.html#b1">TView</a>, <a class="el" href="classTScrollBar.html#b1">TScrollBar</a>, <a class="el" href="classTScroller.html#b1">TScroller</a>, <a class="el" href="classTListViewer.html#b1">TListViewer</a>, <a class="el" href="classTGroup.html#b1">TGroup</a>, and <a class="el" href="classTWindow.html#b1">TWindow</a>. </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="tobjstrm_8h-source.html">tobjstrm.h</a></ul>
<hr><address><small>Generated at Sat Sep 22 20:19:35 2001 for TVision by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.gif" alt="doxygen" align="middle" border=0
width=110 height=53></a>1.2.8.1 written by <a href="mailto:dimitri@stack.nl">Dimitri van Heesch</a>,
© 1997-2001</small></address>
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