classqextserialbase.html

QT 串口开发开发库

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          <td class="md" nowrap valign="top"> bool QextSerialBase::isOpen </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">void&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
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          <td class="md" nowrap><code> [virtual]</code></td>
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<p>
Returns true if the port is currently open, false otherwise     </td>
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<a name="a26" doxytag="QextSerialBase::isOpen"></a><p>
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          <td class="md" nowrap valign="top"> bool QextSerialBase::isOpen </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">void&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap> const<code> [virtual]</code></td>
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<p>
Returns true if the port associated with the class is currently open, or false if it is not.     </td>
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<a name="a27" doxytag="QextSerialBase::lastError"></a><p>
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          <td class="md" nowrap valign="top"> unsigned long QextSerialBase::lastError </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap> const<code> [virtual]</code></td>
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<p>
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>
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>     </td>
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<a name="a4" doxytag="QextSerialBase::name"></a><p>
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          <td class="md" nowrap valign="top"> const char * QextSerialBase::name </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap> const<code> [virtual]</code></td>
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Returns a pointer to a string containing the name of the device associated with the object     </td>
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<a name="a7" doxytag="QextSerialBase::open"></a><p>
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          <td class="md" nowrap valign="top"> bool QextSerialBase::open </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const char *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp; <em>name</em>          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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<p>
Opens a serial port by name. The string passed in the name parameter is associated with the  object and subsequent calls to <a class="el" href="classQextSerialBase.html#a7">open</a>() may use the no-parameter version. This function has no  effect if the port associated with the class is already open. The port is also configured to the  current settings, as stored in the Settings structure.     </td>
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<a name="a19" doxytag="QextSerialBase::parity"></a><p>
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          <td class="md" nowrap valign="top"> ParityType QextSerialBase::parity </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap> const<code> [virtual]</code></td>
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<p>
Returns the type of parity used by the port. For a list of possible values returned by  this function, see the definition of the enum ParityType.     </td>
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<a name="a11" doxytag="QextSerialBase::readLine"></a><p>
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          <td class="md" nowrap valign="top"> int QextSerialBase::readLine </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">char *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>data</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>uint&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>maxlen</em></td>
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          <td></td>
          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [virtual]</code></td>
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<p>
This function will read a line of buffered input from the port, stopping when either maxlen bytes have been read, the port has no more data available, or a newline is encountered. The value  returned is the length of the string that was read.
<p>
Thanks to Olivier Tubach for the original version of this function.     </td>
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<a name="a5" doxytag="QextSerialBase::setName"></a><p>
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          <td class="md" nowrap valign="top"> void QextSerialBase::setName </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const char *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp; <em>name</em>          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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Sets the name of the device associated with the object, e.g. "COM1", or "/dev/ttyS0".     </td>
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<a name="a23" doxytag="QextSerialBase::stopBits"></a><p>
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          <td class="md" nowrap valign="top"> StopBitsType QextSerialBase::stopBits </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap> const<code> [virtual]</code></td>
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Returns the number of stop bits used by the port. For a list of possible return values, see the definition of the enum StopBitsType.     </td>
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<a name="a14" doxytag="QextSerialBase::ungetch"></a><p>
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          <td class="md" nowrap valign="top"> int QextSerialBase::ungetch </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">int&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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<p>
This function is included to implement the full QIODevice interface, and currently has no  purpose within this class. This function is meaningless on an unbuffered device and currently only prints a warning message to that effect. 
<p>
Reimplemented in <a class="el" href="classPosix__QextSerialPort.html#a13">Posix_QextSerialPort</a>, and <a class="el" href="classWin__QextSerialPort.html#a13">Win_QextSerialPort</a>.    </td>
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<hr>The documentation for this class was generated from the following files:<ul>
<li>qextserialbase.cpp<li><a class="el" href="qextserialbase_8h-source.html">qextserialbase.h</a></ul>
<hr><address><small>Generated on Sat Jun 15 15:43:04 2002 for QextSerialPort by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.gif" alt="doxygen" align="middle" border=0 
width=110 height=53></a>1.2.13.1 written by <a href="mailto:[e-mail]">Dimitri van Heesch</a>,
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