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<h2>
<a name="1204959"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">debugpollkey</font>
</h2><hr>
<p>
<a name="1204960"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Get a character from the keyboard</font>
</p>
<h3>
<a name="1204961"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Synopsis</font>
</h3>
<a name="1215072"> </a><font size=2 face=Courier><strong>#include <debug.h><br></strong></font>
<a name="1217063"> </a><font size=2 face=Courier><strong>long int debugpollkey( long int <font size=2 face=Courier><strong><em>*buf </em></strong></font>);<br></strong></font>
<h3>
<a name="1215074"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Arguments</font>
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<p>
<a name="1215054"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b><font size=2 face=Courier><strong>long int </strong></font><font size=2 face=Courier><strong><em>*buf</em></strong></font></b></font>
<br>
<dl><dl> <dl>
<dt> <a name="1215055"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A pointer to a location where the input key will be stored</font>
</dl>
</dl></dl>
<h3>
<a name="1204967"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Results</font>
</h3>
<p>
<a name="1204968"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>0</strong></font> if no key was available, <font size=2 face=Courier><strong>1</strong></font> if a key was available; other values are errors.</font>
</p>
<h3>
<a name="1204969"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Errors</font>
</h3>
<p>
<a name="1204970"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The function will fail to execute if another debug function is already executing (for example from another concurrent thread of execution) and a mutual exclusion function pointer has not been registered with the debug library. In this case the function returns <font size=2 face=Courier><strong>DEBUG_FN_REENTERED</strong></font>. If the debugger is not connected to the target, the function will fail and return <font size=2 face=Courier><strong>DEBUG_NOT_CONNECTED</strong></font>. The value returned for any other error is <font size=2 face=Courier><strong>-1</strong></font>.</font>
</p>
<h3>
<a name="1204971"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Description</font>
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<p>
<a name="1204972"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>debugpollkey</strong></font> gets a single character from the keyboard and stores it in the location pointed to by <font size=2 face=Courier><strong><em>buf</em></strong></font>. If no keystroke is available the routine returns immediately with <font size=2 face=Courier><strong>0</strong></font>. The effect on any buffered data in the standard input stream is host-defined.</font>
</p>
<p>
<a name="1217865"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Due to an operating system limitation, the <font size=2 face=Courier><strong>ESC</strong></font> key cannot be polled on Windows<sup>⌨️ 快捷键说明
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