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<title>MFC Timers - A Tutorial</title>
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<a href="http://www.earthwalkdesigns.com"><img src="EarthWalk.gif" border="0" align="center" ></a>
<br>
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<b>MFC Timers - A Tutorial
</b></font>
<br>
<img src="Colorbar.gif" border="0" align="center" ><br>
</center>
<b><u>Installing Timer Interrupts</u></b>
<p>
<ol type=1>
<li>In the header file of the dialog using the timer,
<ol type=A>
<p>
<li>Add a message number for each timer needed:
<p>
<ul>
<table border=0>
<tr >
<td width=100>#define
<td width=150>IDT_TIMER_0
<td >WM_USER + 200
<tr>
<td width=100>#define
<td width=150>IDT_TIMER_1
<td>IDT_TIMER_0 + 1
</table>
</ul>
<p>
<li>Add the timer interrupt handler
<p>
<ul>
<b>OnTimer (UINT TimerVal)</b>
</ul>
<p>
to the <i>Generated Message Map</i>:
<p>
<ol type=a>
<li>locate the section under <b>Implementation</b> where the
<b>AFX_MSG</b> message map is declared (usually begins with the
line <i>OnInitDialog()</i>);
<p>
<li>add a line just after the last line in the message map (just before the
"//}}AFX_MSG"):
<p>
<ul>
<table border=0>
<tr >
<td width=80><b>afx_msg</b>
<td width=80><b>void</b>
<td ><b>OnTimer (UINT TimerVal);</b>
</table>
</ul>
<p>
This should be the <b>last</b> entry in the message map.
</ol>
</ol>
<p>
<li>In the dialog implementation (.cpp) file,
<p>
<ol type=A>
<li>Locate the dialog class start
<p>
<li>Find the line starting "BEGIN_MESSAGE_MAP"
<p>
<li>After the last entry in the message map (before the line "//}}AFX_MSG_MAP"),
add
<p>
<ul>
<b>ON_WM_TIMER ( )</b>
</ul>
<p>
</ol>
</ol>
<p>
<center>
<img src="Colorbar.gif" border="0" align="center" ><br>
</center>
<font size="-1">
Copyright (c) 1997,1998. EarthWalk Designs.
<br>
Direct all inquiries to:<a href="mailto:jay@earthwalkdesigns.com">Jay Wheeler</a>
at EarthWalkDesigns.com
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