📄 trace.htm
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<html><head><meta http-equiv="Content-Language" content="en-us"><meta http-equiv="Content-Type" content="text/html; charset=windows-1252"><title>UDT Reference</title></head><body><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="table2" bgcolor="#99CCFF" bordercolor="#99CCFF"> <tr> <td width="100%"><font face="Verdana" size="2"><i> UDT Reference: UDT Functions</i></font></td> </tr></table><h1 style="margin-bottom: 0"><font face="Verdana" size="4">perfmon</font></h1><p><font face="Verdana" size="2">The <b>perfmon </b>method retrieve<span lang="zh-cn">s the internal protocol parameters and performance trace</span>.</font></p><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="table3" bgcolor="#C0C0C0" bordercolor="#C0C0C0"> <tr> <td width="100%"> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">int perfmon(</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> UDTSOCKET <font color="#FFFFFF">u</font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> TRACEINFO* <font color="#FFFFFF">perf,</font></font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1" color="#FFFFFF"> </font> <font face="Courier New" size="1">bool</font><font face="Courier New" size="1" color="#FFFFFF"> </font><font face="Courier New" size="1"><font color="#FFFFFF">clear</font> =</font><font face="Courier New" size="1" color="#FFFFFF"> </font><font face="Courier New" size="1"> true<br> );</font></p> </td> </tr></table><h4><font face="Verdana" size="2">Parameters</font></h4><dl> <dt><font size="2" face="Verdana"> <i>u</i> </font> </dt> <dd><font face="Verdana" size="2">[in] The socket descriptor of an UDT entity.</font></dd> <dt><span lang="zh-cn"><i><font face="Verdana" size="2">trace</font></i></span></dt> <dd><font face="Verdana" size="2">[out] Pointer to <span lang="zh-cn">the </span>structure to store the performance trace information.</font></dd> <dt><i><font face="Verdana" size="2">clear</font></i></dt> <dd><font face="Verdana" size="2">[in] Flag to indicates if the local traces should be cleared. "true" will clear the trace and restart the count.</font></dd></dl><h4><font face="Verdana" size="2">Return Values</font></h4><p><font face="Verdana" size="2">On success, 0 is returned; Otherwise, UDT::ERROR is returned and the specific error information can be retrieved by<a href="error.htm">getlasterror</a>.</font></p> <table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" id="table4" bordercolordark="#C0C0C0" bordercolorlight="#C0C0C0" width="100%"> <tr> <th align="center" bgcolor="#C0C0C0" width="133"> <font face="Verdana" size="2">Error Code</font></th> <th align="center" bgcolor="#C0C0C0" width="812"><b> <font face="Verdana" size="2">Comment</font></b></th> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> 2001</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> connection was broken.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> 5004</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> <i>u</i> is an invalid UDT socket.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> 5005</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> <i>u</i> is not connected.</font></td> </tr> </table><H4><font face="Verdana" size="2">Description</font></H4><p><font face="Verdana" size="2"><b>perfmon</b> reads the the performance data since last time <b>perfmon</b> is executed, or since the connection start time for the first <b>perfmon</b> call. The result is written in the <a href="structure.htm#TRACEINFO"><i>perf</i> structure</a>.</font></p><p><font face="Verdana" size="2"><b>perfmon</b> may have slightly negative effect on the performance, so it is recommended not to enable this function in productivity applications.</font></p></body></html>⌨️ 快捷键说明
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