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linux下的串口通讯程序.用于开发串口程序很方便

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Returns the number of bytes waiting in the port's receive queue. This function will return 0 if the port is not currently open, or -1 on error. Error information can be retrieved by calling Win_QextSerialPort::getLastError(). 
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Implements <a class="el" href="classQextSerialBase.html#7e130a0ba5a0a9ba95ce5f75a5e2c526">QextSerialBase</a>.<div class="fragment"><pre class="fragment"><a name="l00229"></a>00229                                           {
<a name="l00230"></a>00230     LOCK_MUTEX();
<a name="l00231"></a>00231     <span class="keywordflow">if</span> (<a class="codeRef" doxygen="qiodevice.tag:http://doc.trolltech.com/" href="http://doc.trolltech.com/qiodevice.html#isOpen">isOpen</a>()) {
<a name="l00232"></a>00232         DWORD Errors;
<a name="l00233"></a>00233         COMSTAT Status;
<a name="l00234"></a>00234         <span class="keywordtype">bool</span> success=ClearCommError(<a class="code" href="classWin__QextSerialPort.html#f6dae6bb1c6b51e766e551bc11f1721d">Win_Handle</a>, &amp;Errors, &amp;Status);
<a name="l00235"></a>00235         <a class="code" href="classWin__QextSerialPort.html#bf215448e265ab0bc8d06cb05e0f7778">translateError</a>(Errors);
<a name="l00236"></a>00236         <span class="keywordflow">if</span> (success) {
<a name="l00237"></a>00237             <a class="code" href="classQextSerialBase.html#31816951ba89902fa1dfdb6f18b80f41">lastErr</a>=E_NO_ERROR;
<a name="l00238"></a>00238             UNLOCK_MUTEX();
<a name="l00239"></a>00239             <span class="keywordflow">return</span> Status.cbInQue + <a class="codeRef" doxygen="qiodevice.tag:http://doc.trolltech.com/" href="http://doc.trolltech.com/qiodevice.html#bytesAvailable">QIODevice::bytesAvailable</a>();
<a name="l00240"></a>00240         }
<a name="l00241"></a>00241         UNLOCK_MUTEX();
<a name="l00242"></a>00242         <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)-1;
<a name="l00243"></a>00243     }
<a name="l00244"></a>00244     UNLOCK_MUTEX();
<a name="l00245"></a>00245     <span class="keywordflow">return</span> 0;
<a name="l00246"></a>00246 }
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<a class="anchor" name="3a7ddf86a867770c88777c3e78545cb0"></a><!-- doxytag: member="QextSerialPort::close" ref="3a7ddf86a867770c88777c3e78545cb0" args="()" -->
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          <td class="memname">void Posix_QextSerialPort::close           </td>
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Closes a serial port. This function has no effect if the serial port associated with the class is not currently open. 
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Implements <a class="el" href="classQextSerialBase.html#2a4aea428bc05a88f86849bb7478c082">QextSerialBase</a>.<div class="fragment"><pre class="fragment"><a name="l00865"></a>00865 {
<a name="l00866"></a>00866     LOCK_MUTEX();
<a name="l00867"></a>00867     <a class="code" href="classPosix__QextSerialPort.html#c4fcc5ae9850c3bc9952a13e4ef82273">Posix_File</a>-&gt;close();
<a name="l00868"></a>00868     <a class="codeRef" doxygen="qiodevice.tag:http://doc.trolltech.com/" href="http://doc.trolltech.com/qiodevice.html#close">QIODevice::close</a>();
<a name="l00869"></a>00869     UNLOCK_MUTEX();
<a name="l00870"></a>00870 }
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<a class="anchor" name="fd2a4f6a94c877e5ae2dbf742af61b1d"></a><!-- doxytag: member="QextSerialPort::close" ref="fd2a4f6a94c877e5ae2dbf742af61b1d" args="()" -->
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          <td class="memname">void Win_QextSerialPort::close           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [virtual, inherited]</code></td>
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Closes a serial port. This function has no effect if the serial port associated with the class is not currently open. 
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Implements <a class="el" href="classQextSerialBase.html#2a4aea428bc05a88f86849bb7478c082">QextSerialBase</a>.<div class="fragment"><pre class="fragment"><a name="l00187"></a>00187                                {
<a name="l00188"></a>00188     LOCK_MUTEX();
<a name="l00189"></a>00189     CloseHandle(<a class="code" href="classWin__QextSerialPort.html#f6dae6bb1c6b51e766e551bc11f1721d">Win_Handle</a>);
<a name="l00190"></a>00190     <a class="codeRef" doxygen="qiodevice.tag:http://doc.trolltech.com/" href="http://doc.trolltech.com/qiodevice.html#close">QIODevice::close</a>();
<a name="l00191"></a>00191     UNLOCK_MUTEX();
<a name="l00192"></a>00192 }
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<a class="anchor" name="7495b472b5e269d04c0c2e856901207f"></a><!-- doxytag: member="QextSerialPort::construct" ref="7495b472b5e269d04c0c2e856901207f" args="()" -->
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          <td class="memname">void QextSerialBase::construct           </td>
          <td>(</td>
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          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [virtual, inherited]</code></td>
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Common constructor function for setting up default port settings. (115200 Baud, 8N1, Hardware flow control where supported, otherwise no flow control, and 500 ms timeout). <div class="fragment"><pre class="fragment"><a name="l00083"></a>00083 {
<a name="l00084"></a>00084     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#be617f3545d6be4587e1a0700a0b0e5b">BaudRate</a>=<a class="code" href="qextserialbase_8h.html#6f031169a6a9b150b5af707bb23cf01054a5ab3e880bc1722d455e420c0351e6">BAUD115200</a>;
<a name="l00085"></a>00085     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#9ec9d5a304b2ac8d3a100d07bce7c0b6">DataBits</a>=<a class="code" href="qextserialbase_8h.html#189ef78c2c1b7537ab114d576f6214fa719dc653cb3f7c9fbf6c8b8c36d78a9f">DATA_8</a>;
<a name="l00086"></a>00086     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#8d0bfbdcb40e9e3919e3f9829ae72582">Parity</a>=<a class="code" href="qextserialbase_8h.html#ee22d32d87c815090354bf9b8e957acee0df16cbf90ff8b05d96d37094b3980a">PAR_NONE</a>;
<a name="l00087"></a>00087     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#0752c70eb7e12f02ddf59739a056b04c">StopBits</a>=<a class="code" href="qextserialbase_8h.html#dc8078895cd941d755d46633b54d3e7f5a97cec5fc7aa14a4caae4b53d97fcfc">STOP_1</a>;
<a name="l00088"></a>00088     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#10720f6217b8d8b90c326ea030c43e30">FlowControl</a>=<a class="code" href="qextserialbase_8h.html#02ad1c7cf791a069dd54e409f8db479037eb6a580629a080ce39792149cf4976">FLOW_HARDWARE</a>;
<a name="l00089"></a>00089     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#159ca543549b3b872917fc4ef0757b60">Timeout_Sec</a>=0;
<a name="l00090"></a>00090     <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#c1b008038ad143262a2ee18247fe2c39">Timeout_Millisec</a>=500;
<a name="l00091"></a>00091 
<a name="l00092"></a>00092 <span class="preprocessor">#ifdef QT_THREAD_SUPPORT</span>
<a name="l00093"></a>00093 <span class="preprocessor"></span>    <span class="keywordflow">if</span> (!<a class="code" href="classQextSerialBase.html#f3d14f4614db4415c5f89746633cf197">mutex</a>) {
<a name="l00094"></a>00094         <a class="code" href="classQextSerialBase.html#f3d14f4614db4415c5f89746633cf197">mutex</a>=<span class="keyword">new</span> QMutex( QMutex::Recursive );
<a name="l00095"></a>00095     }
<a name="l00096"></a>00096     <a class="code" href="classQextSerialBase.html#e5df0cdbbf84781c17f02b8dbc99c93a">refCount</a>++;
<a name="l00097"></a>00097 <span class="preprocessor">#endif</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span>
<a name="l00099"></a>00099     <a class="codeRef" doxygen="qiodevice.tag:http://doc.trolltech.com/" href="http://doc.trolltech.com/qiodevice.html#setOpenMode">setOpenMode</a>(QIODevice::NotOpen);
<a name="l00100"></a>00100 }
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<a class="anchor" name="6836465ea5deaa1280e0e777e9c8651e"></a><!-- doxytag: member="QextSerialPort::dataBits" ref="6836465ea5deaa1280e0e777e9c8651e" args="() const " -->
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          <td class="memname"><a class="el" href="qextserialbase_8h.html#189ef78c2c1b7537ab114d576f6214fa">DataBitsType</a> QextSerialBase::dataBits           </td>
          <td>(</td>
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          <td width="100%"> const<code> [virtual, inherited]</code></td>
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Returns the number of data bits used by the port. For a list of possible values returned by this function, see the definition of the enum DataBitsType. <div class="fragment"><pre class="fragment"><a name="l00136"></a>00136 {
<a name="l00137"></a>00137     <span class="keywordflow">return</span> <a class="code" href="classQextSerialBase.html#2d796e3080f78ff63e821f528439db57">Settings</a>.<a class="code" href="structPortSettings.html#9ec9d5a304b2ac8d3a100d07bce7c0b6">DataBits</a>;
<a name="l00138"></a>00138 }
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