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QT 下linux串口类

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Flushes all pending I/O to the 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#58df9d786aa70dfe9f547d4118103f39">QextSerialBase</a>.<div class="fragment"><pre class="fragment"><a name="l00878"></a>00878 {
<a name="l00879"></a>00879     LOCK_MUTEX();
<a name="l00880"></a>00880     <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="l00881"></a>00881         <a class="code" href="classPosix__QextSerialPort.html#c4fcc5ae9850c3bc9952a13e4ef82273">Posix_File</a>-&gt;flush();
<a name="l00882"></a>00882     }
<a name="l00883"></a>00883     UNLOCK_MUTEX();
<a name="l00884"></a>00884 }
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<a class="anchor" name="c72e737e24bda9c14a9388eac8ef2622"></a><!-- doxytag: member="QextBaseType::flush" ref="c72e737e24bda9c14a9388eac8ef2622" args="()" -->
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          <td class="memname">void Win_QextSerialPort::flush           </td>
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Flushes all pending I/O to the 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#58df9d786aa70dfe9f547d4118103f39">QextSerialBase</a>.<div class="fragment"><pre class="fragment"><a name="l00199"></a>00199                                {
<a name="l00200"></a>00200     LOCK_MUTEX();
<a name="l00201"></a>00201     <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="l00202"></a>00202         FlushFileBuffers(<a class="code" href="classWin__QextSerialPort.html#f6dae6bb1c6b51e766e551bc11f1721d">Win_Handle</a>);
<a name="l00203"></a>00203     }
<a name="l00204"></a>00204     UNLOCK_MUTEX();
<a name="l00205"></a>00205 }
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<a class="anchor" name="099fb47548a3566ed32d4d878fa57f4c"></a><!-- doxytag: member="QextBaseType::isSequential" ref="099fb47548a3566ed32d4d878fa57f4c" args="() const " -->
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          <td class="memname">bool QextSerialBase::isSequential           </td>
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          <td width="100%"> const<code> [virtual, inherited]</code></td>
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Returns true if device is sequential, otherwise returns false. Serial port is sequential device so this function always returns true. Check <a class="elRef" doxygen="qiodevice.tag:http://doc.trolltech.com/" href="http://doc.trolltech.com/qiodevice.html#isSequential">QIODevice::isSequential()</a> documentation for more information. <div class="fragment"><pre class="fragment"><a name="l00177"></a>00177 {
<a name="l00178"></a>00178     <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00179"></a>00179 }
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<a class="anchor" name="e4029cb49127422b7e76586930366b05"></a><!-- doxytag: member="QextBaseType::lastError" ref="e4029cb49127422b7e76586930366b05" args="() const " -->
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          <td class="memname">ulong QextSerialBase::lastError           </td>
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          <td width="100%"> const<code> [virtual, inherited]</code></td>
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Returns the code for the last error encountered by the port, or E_NO_ERROR if the last port operation was successful. Possible error codes are:<p>
<div class="fragment"><pre class="fragment">Error                           Explanation
---------------------------     -------------------------------------------------------------
E_NO_ERROR                      No Error has occured
E_INVALID_FD                    Invalid file descriptor (port was not opened correctly)
E_NO_MEMORY                     Unable to allocate memory tables (POSIX)
E_CAUGHT_NON_BLOCKED_SIGNAL     Caught a non-blocked signal (POSIX)
E_PORT_TIMEOUT                  Operation timed out (POSIX)
E_INVALID_DEVICE                The file opened by the port is not a character device (POSIX)
E_BREAK_CONDITION               The port detected a break condition
E_FRAMING_ERROR                 The port detected a framing error
                                (usually caused by incorrect baud rate settings)
E_IO_ERROR                      There was an I/O error while communicating with the port
E_BUFFER_OVERRUN                Character buffer overrun
E_RECEIVE_OVERFLOW              Receive buffer overflow
E_RECEIVE_PARITY_ERROR          The port detected a parity error in the received data
E_TRANSMIT_OVERFLOW             Transmit buffer overflow
E_READ_FAILED                   General read operation failure
E_WRITE_FAILED                  General write operation failure
</pre></div> <div class="fragment"><pre class="fragment"><a name="l00248"></a>00248 {
<a name="l00249"></a>00249     <span class="keywordflow">return</span> <a class="code" href="classQextSerialBase.html#31816951ba89902fa1dfdb6f18b80f41">lastErr</a>;
<a name="l00250"></a>00250 }
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<a class="anchor" name="b419544e866cab58b8a3ce6341f6a7e9"></a><!-- doxytag: member="QextBaseType::lineStatus" ref="b419544e866cab58b8a3ce6341f6a7e9" args="()" -->
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          <td class="memname">unsigned long Posix_QextSerialPort::lineStatus           </td>
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          <td width="100%"><code> [virtual, inherited]</code></td>
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returns the line status as stored by the port function. This function will retrieve the states of the following lines: DCD, CTS, DSR, and RI. On POSIX systems, the following additional lines can be monitored: DTR, RTS, Secondary TXD, and Secondary RXD. The value returned is an unsigned long with specific bits indicating which lines are high. The following constants should be used to examine the states of individual lines:<p>
<div class="fragment"><pre class="fragment">Mask        Line
------      ----
LS_CTS      CTS
LS_DSR      DSR
LS_DCD      DCD
LS_RI       RI
LS_RTS      RTS (POSIX only)
LS_DTR      DTR (POSIX only)
LS_ST       Secondary TXD (POSIX only)
LS_SR       Secondary RXD (POSIX only)
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This function will return 0 if the port associated with the class is not currently open. 
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Implements <a class="el" href="classQextSerialBase.html#28b87dd41160a61e2953dca38aa332d6">QextSerialBase</a>.<div class="fragment"><pre class="fragment"><a name="l01042"></a>01042 {
<a name="l01043"></a>01043     <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Status=0, Temp=0;
<a name="l01044"></a>01044     LOCK_MUTEX();
<a name="l01045"></a>01045     <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="l01046"></a>01046         ioctl(<a class="code" href="classPosix__QextSerialPort.html#c4fcc5ae9850c3bc9