Hi,<br><br>i have the error the second time I call the method SingleStep(0) in my doEventLoop() method.<br><br>It occurs in this block of instructions (exactly at the instruction<span style=" color:#c0c0c0;"> </span><span style=" color:#000000;">(*</span><span style=" color:#000000;">handler</span><span style=" color:#000000;">-></span><span style=" color:#800000;">handlerProc</span><span style=" color:#000000;">)(</span><span style=" color:#000000;">handler</span><span style=" color:#000000;">-></span><span style=" color:#800000;">clientData</span><span style=" color:#000000;">,</span><span style=" color:#c0c0c0;"> </span><span style=" color:#000000;">resultConditionSet</span><span style=" color:#000000;">)</span>
)<pre style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" color:#c0c0c0;"></span><span style=" color:#000000;"></span><font size="4"><br></font></pre>
<font size="4"><span style="color: rgb(128, 128, 0);">if</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">handler</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">==</span><span style="color: rgb(192, 192, 192);"> </span>NULL<span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&&</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 0, 0);">fLastHandledSocketNum</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">>=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 128);">0</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">{</span>
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">//</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">We</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">didn't</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">call</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">a</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">handler,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">but</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">we</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">didn't</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">get</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">to</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">check</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">all</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">of</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">them,</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">//</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">so</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">try</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">again</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">from</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">the</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">beginning:</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">iter</span><span style="color: rgb(0, 0, 0);">.</span>reset<span style="color: rgb(0, 0, 0);">();</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">while</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">((</span><span style="color: rgb(0, 0, 0);">handler</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">iter</span><span style="color: rgb(0, 0, 0);">.</span>next<span style="color: rgb(0, 0, 0);">())</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">!=</span><span style="color: rgb(192, 192, 192);"> </span>NULL<span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">{</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">int</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">handler</span><span style="color: rgb(0, 0, 0);">-></span><span style="color: rgb(128, 0, 0);">socketNum</span><span style="color: rgb(0, 0, 0);">;</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">//</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">alias</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">int</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">resultConditionSet</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 128);">0</span><span style="color: rgb(0, 0, 0);">;</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">if</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">(</span>FD_ISSET<span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(0, 0, 0);">readSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&&</span><span style="color: rgb(192, 192, 192);"> </span>FD_ISSET<span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(128, 0, 0);">fReadSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(0, 128, 0);">/*sanity</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">check*/</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">resultConditionSet</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">|=</span><span style="color: rgb(192, 192, 192);"> </span>SOCKET_READABLE<span style="color: rgb(0, 0, 0);">;</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">if</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">(</span>FD_ISSET<span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(0, 0, 0);">writeSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&&</span><span style="color: rgb(192, 192, 192);"> </span>FD_ISSET<span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(128, 0, 0);">fWriteSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(0, 128, 0);">/*sanity</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">check*/</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">resultConditionSet</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">|=</span><span style="color: rgb(192, 192, 192);"> </span>SOCKET_WRITABLE<span style="color: rgb(0, 0, 0);">;</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">if</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">(</span>FD_ISSET<span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(0, 0, 0);">exceptionSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&&</span><span style="color: rgb(192, 192, 192);"> </span>FD_ISSET<span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">,</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(128, 0, 0);">fExceptionSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(0, 128, 0);">/*sanity</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">check*/</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">resultConditionSet</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">|=</span><span style="color: rgb(192, 192, 192);"> </span>SOCKET_EXCEPTION<span style="color: rgb(0, 0, 0);">;</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">if</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">((</span><span style="color: rgb(0, 0, 0);">resultConditionSet</span><span style="color: rgb(0, 0, 0);">&</span><span style="color: rgb(0, 0, 0);">handler</span><span style="color: rgb(0, 0, 0);">-></span><span style="color: rgb(128, 0, 0);">conditionSet</span><span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">!=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 128);">0</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">&&</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">handler</span><span style="color: rgb(0, 0, 0);">-></span><span style="color: rgb(128, 0, 0);">handlerProc</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">!=</span><span style="color: rgb(192, 192, 192);"> </span>NULL<span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">{</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 0, 0);">fLastHandledSocketNum</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">sock</span><span style="color: rgb(0, 0, 0);">;</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">//</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">Note:</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">we</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">set</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">"fLastHandledSocketNum"</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">before</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">calling</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">the</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">handler,</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">//</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">in</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">case</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">the</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">handler</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">calls</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">"doEventLoop()"</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">reentrantly.</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 51);">(*handler-></span><span style="color: rgb(128, 0, 0); background-color: rgb(255, 255, 51);">handlerProc</span><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 51);">)(handler-></span><span style="color: rgb(128, 0, 0); background-color: rgb(255, 255, 51);">clientData</span><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 51);">,</span><span style="color: rgb(192, 192, 192); background-color: rgb(255, 255, 51);"> </span><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 51);">resultConditionSet);</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">break</span><span style="color: rgb(0, 0, 0);">;</span></font></pre>
<font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">}</span></font></pre><font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">}</span></font></pre><font size="4">
</font><pre style="margin: 0px; text-indent: 0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 128, 0);">if</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">(</span><span style="color: rgb(0, 0, 0);">handler</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">==</span><span style="color: rgb(192, 192, 192);"> </span>NULL<span style="color: rgb(0, 0, 0);">)</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(128, 0, 0);">fLastHandledSocketNum</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">=</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 0, 0);">-</span><span style="color: rgb(0, 0, 128);">1</span><span style="color: rgb(0, 0, 0);">;</span><span style="color: rgb(0, 128, 0);">//because</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">we</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">didn't</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">call</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">a</span><span style="color: rgb(192, 192, 192);"> </span><span style="color: rgb(0, 128, 0);">handler</span></font></pre>
<font size="4">
</font><pre style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font size="4"><span style="color: rgb(192, 192, 192);"> </span></font><span style=" color:#000000;"><font size="4">}</font><br>
<br><br><font size="4">Could I attach my code?</font><br></span></pre><br>Thank you<br>-Antonio<br><br><div class="gmail_quote">2011/10/28 Ross Finlayson <span dir="ltr"><<a href="mailto:finlayson@live555.com">finlayson@live555.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div style="word-wrap:break-word"><div><div class="im"><blockquote type="cite">I'm trying to implement a GUI with QtWidget in order to show video frame from a rtsp camera.<br>
<br>I started from the code of openRTSP and I modified it in order to have c++ classes.<br><br>After it runs:<br>
<br><span style="color:#800000">env</span><span style="color:#000000">-></span>taskScheduler<span style="color:#000000">().</span><span style="font-style:italic;color:#000000">doEventLoop</span><span style="color:#000000">();</span><br>
<br>it comes back to the "continueAfterOPTIONS" member function. The problem is that all class variables lose their values, probably a problem with memory management.<br></blockquote><div><br></div></div>The problem is more likely to be that you're not using this function correctly. Note that the "continueAfterOPTIONS()" function (and the other "continueAfter...()" functions) take a "RTSPClient*" as the first parameter. In the current code, this parameter is not used (because we have only one "RTSPClient" object, which is a global variable "ourRTSPClient"). However, if you want to use this code in your own custom application - where the "RTSPClient" object is not a global variable (or there's more than one "RTSPClient" object) - then you will need to use this first parameter to the "continueAfter...()" functions; it will point to the "RTSPClient" object.</div>
<br><font color="#888888"><br><div>
<span style="border-collapse:separate;color:rgb(0, 0, 0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:medium"><span style="border-collapse:separate;color:rgb(0, 0, 0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-size:medium">Ross Finlayson<br>
Live Networks, Inc.<br><a href="http://www.live555.com/" target="_blank">http://www.live555.com/</a></span></span>
</div>
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<br></blockquote></div><br><br clear="all"><br>-- <br><i><div><span style="font-style:normal"><i>Antonio Nunziante</i></span></div></i><br>
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