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<h3 align="center"><font color="#aoao99">hexedit control </font></h3>
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<!-- author and contact details -->
<p>this article was contributed by <a href="mailto:saurwein@uniwares.com">andreas saurwein</a>.
<!-- sample image - gif or jpg --></p>
<p><img src="hexeditctrl.gif" tppabs="http://www.codeguru.com/editctrl/hexeditctrl.gif"
width="483" height="361"> <!-- text / source code --> </p>
<p>the hexedit control is a plain hex editor wrapped in a cedit derived class called
chexedit. where ever you use a cedit class you can replace it with the chexedit class.
chexedit supports the following features:
<ol>
<li>addressdisplay can be short or long or turned off.</li>
<li>hexdisplay can have any width between 1 and 256 bytes or turned off</li>
<li>asciidisplay can have any width between 1 and 256 bytes or turned off</li>
<li>editing in hex or ascii mode</li>
<li>cut/copy/paste support (text and/or binary format, binary compatible with devstudio)</li>
</ol>
<p>undo is in the context menu but not implemented right now. horizontal scrolling is also
not supported right now.</p>
<h2>public methods</h2>
<table border="0" width="100%" cellspacing="0" cellpadding="2">
<tr>
<td width="33%" bgcolor="#808080" valign="top"><h3><font color="#ffffff">getdata</font></h3>
</td>
<td width="67%" colspan="2" bgcolor="#c0c0c0" valign="top"><tt>int getdata(lpbyte p, int
len);</tt></td>
</tr>
<tr>
<td width="100%" bgcolor="#d2d2d2" valign="top" colspan="3">use getdata to retrieve the
modified data from the control.</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><b>parameter</b></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>lpbyte p</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">pointer to the databuffer</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>int len</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">length of the databuffer</td>
</tr>
<tr>
<td width="33%" bgcolor="#c0c0c0" valign="top"><strong>return value</strong></td>
<td width="33%" bgcolor="#c0c0c0" valign="top">number of bytes copied</td>
<td width="34%" bgcolor="#c0c0c0" valign="top"></td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><strong>remarks</strong></td>
<td width="67%" bgcolor="#d2d2d2" colspan="2" valign="top">the getdata method copies the
data to the buffer provided with the parameter p.</td>
</tr>
</table>
<hr>
<table border="0" width="100%" cellspacing="0" cellpadding="2">
<tr>
<td width="33%" bgcolor="#808080" valign="top"><h3><font color="#ffffff">setdata</font></h3>
</td>
<td width="67%" colspan="2" bgcolor="#c0c0c0" valign="top"><tt>void setdata(lpbyte p, int
len);</tt></td>
</tr>
<tr>
<td width="100%" bgcolor="#d2d2d2" valign="top" colspan="3">use setdata to set the content
that the control displays for editing</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><b>parameter</b></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>lpbyte p</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">pointer to the databuffer</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>int len</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">length of the databuffer</td>
</tr>
<tr>
<td width="33%" bgcolor="#c0c0c0" valign="top"><strong>return value</strong></td>
<td width="33%" bgcolor="#c0c0c0" valign="top">none</td>
<td width="34%" bgcolor="#c0c0c0" valign="top"></td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><strong>remarks</strong></td>
<td width="67%" bgcolor="#d2d2d2" colspan="2" valign="top">the setdata method copies the
data from the buffer provided with the parameter p into a internal working copy.</td>
</tr>
</table>
<hr>
<table border="0" width="100%" cellspacing="0" cellpadding="2">
<tr>
<td width="33%" bgcolor="#808080" valign="top"><h3><font color="#ffffff">getsel</font></h3>
</td>
<td width="67%" colspan="2" bgcolor="#c0c0c0" valign="top"><tt>csize getsel(void);</tt></td>
</tr>
<tr>
<td width="100%" bgcolor="#d2d2d2" valign="top" colspan="3">use getsel to retrieve the
range of bytes the user has selected.</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><b>parameter</b></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>none</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top"></td>
</tr>
<tr>
<td width="33%" bgcolor="#c0c0c0" valign="top"><strong>return value</strong></td>
<td width="33%" bgcolor="#c0c0c0" valign="top"><pre>csize</pre>
</td>
<td width="34%" bgcolor="#c0c0c0" valign="top">where cx contains the start and cy contains
the end of the selection.</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><strong>remarks</strong></td>
<td width="67%" bgcolor="#d2d2d2" colspan="2" valign="top">if nothing is selected both cx
and cy are -1</td>
</tr>
</table>
<hr>
<table border="0" width="100%" cellspacing="0" cellpadding="2">
<tr>
<td width="33%" bgcolor="#808080" valign="top"><h3><font color="#ffffff">setsel</font></h3>
</td>
<td width="67%" colspan="2" bgcolor="#c0c0c0" valign="top"><tt>void setsel(int s, int e);</tt>
</td>
</tr>
<tr>
<td width="100%" bgcolor="#d2d2d2" valign="top" colspan="3">use setsel to set the
selection.</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><b>parameter</b></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>int s</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">start of selection</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>int e</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">end of selection</td>
</tr>
<tr>
<td width="33%" bgcolor="#c0c0c0" valign="top"><strong>return value</strong></td>
<td width="33%" bgcolor="#c0c0c0" valign="top"><pre>none</pre>
</td>
<td width="34%" bgcolor="#c0c0c0" valign="top"></td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><strong>remarks</strong></td>
<td width="67%" bgcolor="#d2d2d2" colspan="2" valign="top">to clear any selection set both
s and e to -1</td>
</tr>
</table>
<hr>
<table border="0" width="100%" cellspacing="0" cellpadding="2">
<tr>
<td width="33%" bgcolor="#808080" valign="top"><h3><font color="#ffffff">setbpr</font></h3>
</td>
<td width="67%" colspan="2" bgcolor="#c0c0c0" valign="top"><tt>void setbpr(int bpr);</tt> </td>
</tr>
<tr>
<td width="100%" bgcolor="#d2d2d2" valign="top" colspan="3">use setbpr to set the number
of bytes per row that will be displayed.</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><b>parameter</b></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>int bpr</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">number of bytes to display per row</td>
</tr>
<tr>
<td width="33%" bgcolor="#c0c0c0" valign="top"><strong>return value</strong></td>
<td width="33%" bgcolor="#c0c0c0" valign="top"><pre>none</pre>
</td>
<td width="34%" bgcolor="#c0c0c0" valign="top"></td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><strong>remarks</strong></td>
<td width="67%" bgcolor="#d2d2d2" colspan="2" valign="top">setbpr stands for
setbytesperrow</td>
</tr>
</table>
<hr>
<table border="0" width="100%" cellspacing="0" cellpadding="2">
<tr>
<td width="33%" bgcolor="#808080" valign="top"><h3><font color="#ffffff">setoptions</font></h3>
</td>
<td width="67%" colspan="2" bgcolor="#c0c0c0" valign="top"><tt>void setoptions(bool a,
bool h, bool c, bool w);</tt> </td>
</tr>
<tr>
<td width="100%" bgcolor="#d2d2d2" valign="top" colspan="3">used to set various options.</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><b>parameter</b></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>bool a</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">addressdisplay on/off</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>bool h</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">hexdisplay on/off</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>bool c</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">asciidisplay on/off</td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"></td>
<td width="33%" bgcolor="#d2d2d2" valign="top"><tt>bool w</tt></td>
<td width="34%" bgcolor="#d2d2d2" valign="top">address is short (false) or long (true)</td>
</tr>
<tr>
<td width="33%" bgcolor="#c0c0c0" valign="top"><strong>return value</strong></td>
<td width="33%" bgcolor="#c0c0c0" valign="top"><pre>none</pre>
</td>
<td width="34%" bgcolor="#c0c0c0" valign="top"></td>
</tr>
<tr>
<td width="33%" bgcolor="#d2d2d2" valign="top"><strong>remarks</strong></td>
<td width="67%" bgcolor="#d2d2d2" colspan="2" valign="top"></td>
</tr>
</table>
<p> </p>
<!-- demo project -->
<p><a href="hexeditctrl_demo.zip"
tppabs="http://www.codeguru.com/editctrl/hexeditctrl_demo.zip">download demo project - 32
kb</a> <!-- zipped source --> </p>
<p><a href="hexeditctrl_src.zip"
tppabs="http://www.codeguru.com/editctrl/hexeditctrl_src.zip">download source - 8 kb</a> </p>
<p>date posted: august 25, 1998 <!--comments--> </p>
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