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| 2 | <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/process/process.doc:5 -->
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| 6 | <title>Starting processes with IO redirection</title>
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| 12 | --></style>
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| 16 | <table border="0" cellpadding="0" cellspacing="0" width="100%">
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| 17 | <tr bgcolor="#E5E5E5">
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| 20 | <font color="#004faf">Home</font></a>
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| 24 | <font color="#004faf">Main Classes</font></a>
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| 30 | <font color="#004faf">Functions</font></a>
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| 31 | </td>
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| 32 | <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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| 33 |
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| 34 |
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| 35 | <p>
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| 36 | <p> This example shows you how to start other processes with Qt and how
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| 37 | IO redirection is done. The example tries to start the uic (a tool
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| 38 | that comes with the Qt Designer) on a certain ui file and displays the
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| 39 | output of the command.
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| 40 | <p> <hr>
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| 41 | <p> Implementation (process.cpp):
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| 42 | <p> <pre>/****************************************************************************
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| 43 | ** $Id: process-example.html 2051 2007-02-21 10:04:20Z chehrlic $
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| 44 | **
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| 45 | ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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| 46 | **
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| 47 | ** This file is part of an example program for Qt. This example
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| 48 | ** program may be used, distributed and modified without limitation.
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| 49 | **
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| 50 | *****************************************************************************/
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| 51 |
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| 52 | #include <<a href="qobject-h.html">qobject.h</a>>
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| 53 | #include <<a href="qprocess-h.html">qprocess.h</a>>
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| 54 | #include <<a href="qvbox-h.html">qvbox.h</a>>
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| 55 | #include <<a href="qtextview-h.html">qtextview.h</a>>
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| 56 | #include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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| 57 | #include <<a href="qapplication-h.html">qapplication.h</a>>
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| 58 | #include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
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| 59 |
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| 60 | #include <stdlib.h>
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| 61 |
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| 62 | class UicManager : public <a href="qvbox.html">QVBox</a>
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| 63 | {
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| 64 | <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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| 65 |
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| 66 | public:
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| 67 | UicManager();
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| 68 | ~UicManager() {}
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| 69 |
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| 70 | public slots:
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| 71 | void readFromStdout();
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| 72 | void scrollToTop();
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| 73 |
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| 74 | private:
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| 75 | <a href="qprocess.html">QProcess</a> *proc;
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| 76 | <a href="qtextview.html">QTextView</a> *output;
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| 77 | <a href="qpushbutton.html">QPushButton</a> *quitButton;
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| 78 | };
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| 79 |
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| 80 | <a name="f204"></a>UicManager::UicManager()
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| 81 | {
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| 82 | // Layout
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| 83 | output = new <a href="qtextview.html">QTextView</a>( this );
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| 84 | quitButton = new <a href="qpushbutton.html">QPushButton</a>( <a href="qobject.html#tr">tr</a>("Quit"), this );
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| 85 | <a href="qobject.html#connect">connect</a>( quitButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()),
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| 86 | qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
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| 87 | <a href="qwidget.html#resize">resize</a>( 500, 500 );
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| 88 |
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| 89 | // QProcess related code
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| 90 | proc = new <a href="qprocess.html">QProcess</a>( this );
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| 91 |
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| 92 | // Set up the command and arguments.
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| 93 | // On the command line you would do:
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| 94 | // uic -tr <a href="i18n.html#i18n">i18n</a> "small_dialog.ui"
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| 95 | <a name="x97"></a> proc-><a href="qprocess.html#addArgument">addArgument</a>( "uic" );
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| 96 | proc-><a href="qprocess.html#addArgument">addArgument</a>( "-tr" );
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| 97 | proc-><a href="qprocess.html#addArgument">addArgument</a>( "i18n" );
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| 98 | proc-><a href="qprocess.html#addArgument">addArgument</a>( "small_dialog.ui" );
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| 99 |
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| 100 | <a name="x100"></a> <a href="qobject.html#connect">connect</a>( proc, SIGNAL(<a href="qprocess.html#readyReadStdout">readyReadStdout</a>()),
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| 101 | this, SLOT(readFromStdout()) );
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| 102 | <a name="x98"></a> <a href="qobject.html#connect">connect</a>( proc, SIGNAL(<a href="qprocess.html#processExited">processExited</a>()),
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| 103 | this, SLOT(scrollToTop()) );
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| 104 |
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| 105 | <a name="x101"></a> if ( !proc-><a href="qprocess.html#start">start</a>() ) {
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| 106 | // error handling
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| 107 | <a name="x96"></a> QMessageBox::<a href="qmessagebox.html#critical">critical</a>( 0,
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| 108 | <a href="qobject.html#tr">tr</a>("Fatal error"),
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| 109 | <a href="qobject.html#tr">tr</a>("Could not start the uic command."),
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| 110 | <a href="qobject.html#tr">tr</a>("Quit") );
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| 111 | exit( -1 );
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | void <a name="f205"></a>UicManager::readFromStdout()
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| 116 | {
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| 117 | // Read and process the data.
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| 118 | // Bear in mind that the data might be output in chunks.
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| 119 | <a name="x99"></a><a name="x103"></a> output-><a href="qtextedit.html#append">append</a>( proc-><a href="qprocess.html#readStdout">readStdout</a>() );
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| 120 | }
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| 121 |
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| 122 | void <a name="f206"></a>UicManager::scrollToTop()
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| 123 | {
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| 124 | <a name="x102"></a> output-><a href="qscrollview.html#setContentsPos">setContentsPos</a>( 0, 0 );
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| 125 | }
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| 126 |
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| 127 | int main( int argc, char **argv )
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| 128 | {
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| 129 | <a href="qapplication.html">QApplication</a> a( argc, argv );
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| 130 | UicManager manager;
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| 131 | a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &manager );
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| 132 | manager.<a href="qwidget.html#show">show</a>();
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| 133 | return a.<a href="qapplication.html#exec">exec</a>();
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| 134 | }
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| 135 |
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| 136 | #include "process.moc"
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| 137 | </pre>
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| 138 |
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| 139 | <p>See also <a href="qprocess-examples.html">QProcess Examples</a>.
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| 140 |
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| 141 | <!-- eof -->
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| 142 | <p><address><hr><div align=center>
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| 143 | <table width=100% cellspacing=0 border=0><tr>
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| 144 | <td>Copyright © 2007
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| 145 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 146 | <td align=right><div align=right>Qt 3.3.8</div>
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| 147 | </table></div></address></body>
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| 148 | </html>
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