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149 lines
5.9 KiB
149 lines
5.9 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/process/process.doc:5 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Starting processes with IO redirection</title>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Starting processes with IO redirection</h1>
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<p>
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<p> This example shows you how to start other processes with TQt and how
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IO redirection is done. The example tries to start the uic (a tool
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that comes with the TQt Designer) on a certain ui file and displays the
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output of the command.
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<p> <hr>
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<p> Implementation (process.cpp):
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<p> <pre>/****************************************************************************
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** $Id: qt/process.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qobject-h.html">ntqobject.h</a>>
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#include <<a href="qprocess-h.html">ntqprocess.h</a>>
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#include <<a href="qvbox-h.html">ntqvbox.h</a>>
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#include <<a href="qtextview-h.html">ntqtextview.h</a>>
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#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <<a href="qmessagebox-h.html">ntqmessagebox.h</a>>
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#include <stdlib.h>
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class UicManager : public <a href="ntqvbox.html">TQVBox</a>
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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UicManager();
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~UicManager() {}
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public slots:
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void readFromStdout();
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void scrollToTop();
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private:
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<a href="ntqprocess.html">TQProcess</a> *proc;
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<a href="ntqtextview.html">TQTextView</a> *output;
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<a href="ntqpushbutton.html">TQPushButton</a> *quitButton;
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};
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<a name="f204"></a>UicManager::UicManager()
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{
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// Layout
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output = new <a href="ntqtextview.html">TQTextView</a>( this );
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quitButton = new <a href="ntqpushbutton.html">TQPushButton</a>( <a href="ntqobject.html#tr">tr</a>("Quit"), this );
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<a href="ntqobject.html#connect">connect</a>( quitButton, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()),
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tqApp, SLOT(<a href="ntqapplication.html#quit">quit</a>()) );
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<a href="ntqwidget.html#resize">resize</a>( 500, 500 );
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// TQProcess related code
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proc = new <a href="ntqprocess.html">TQProcess</a>( this );
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// Set up the command and arguments.
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// On the command line you would do:
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// uic -tr <a href="i18n.html#i18n">i18n</a> "small_dialog.ui"
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<a name="x97"></a> proc-><a href="ntqprocess.html#addArgument">addArgument</a>( "uic" );
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proc-><a href="ntqprocess.html#addArgument">addArgument</a>( "-tr" );
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proc-><a href="ntqprocess.html#addArgument">addArgument</a>( "i18n" );
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proc-><a href="ntqprocess.html#addArgument">addArgument</a>( "small_dialog.ui" );
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<a name="x100"></a> <a href="ntqobject.html#connect">connect</a>( proc, SIGNAL(<a href="ntqprocess.html#readyReadStdout">readyReadStdout</a>()),
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this, SLOT(readFromStdout()) );
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<a name="x98"></a> <a href="ntqobject.html#connect">connect</a>( proc, SIGNAL(<a href="ntqprocess.html#processExited">processExited</a>()),
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this, SLOT(scrollToTop()) );
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<a name="x101"></a> if ( !proc-><a href="ntqprocess.html#start">start</a>() ) {
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// error handling
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<a name="x96"></a> TQMessageBox::<a href="ntqmessagebox.html#critical">critical</a>( 0,
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<a href="ntqobject.html#tr">tr</a>("Fatal error"),
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<a href="ntqobject.html#tr">tr</a>("Could not start the uic command."),
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<a href="ntqobject.html#tr">tr</a>("Quit") );
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exit( -1 );
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}
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}
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void <a name="f205"></a>UicManager::readFromStdout()
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{
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// Read and process the data.
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// Bear in mind that the data might be output in chunks.
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<a name="x99"></a><a name="x103"></a> output-><a href="ntqtextedit.html#append">append</a>( proc-><a href="ntqprocess.html#readStdout">readStdout</a>() );
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}
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void <a name="f206"></a>UicManager::scrollToTop()
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{
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<a name="x102"></a> output-><a href="ntqscrollview.html#setContentsPos">setContentsPos</a>( 0, 0 );
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}
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int main( int argc, char **argv )
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{
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<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
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UicManager manager;
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a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &manager );
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manager.<a href="ntqwidget.html#show">show</a>();
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return a.<a href="ntqapplication.html#exec">exec</a>();
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}
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#include "process.moc"
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</pre>
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<p>See also <a href="qprocess-examples.html">TQProcess Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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