1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<!-- qtdll.qdoc -->
<head>
<title>Qt based Application Extension</title>
<link href="classic.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" valign="top" width="32"><img src="images/qt-logo.png" align="left" width="57" height="67" border="0" /></td>
<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a></td>
</tr></table><h1 class="title">Qt based Application Extension<br /><span class="subtitle"></span>
</h1>
<p>This examples shows how to use the <a href="qwinwidget.html">QWinWidget</a> and <a href="qmfcapp.html">QMfcApp</a> classes to implement a Qt based user interface in a plugin DLL.</p>
<p>The plugin implements and exports a <tt>C</tt> function <tt>showDialog</tt> that can be called by any Windows application to display a modal Qt dialog. Before a Qt based user interface can be created a <a href="http://qt.nokia.com/doc/4.6/qapplication.html">QApplication</a> object must exist, and the calling application's event loop and the Qt event loop must run together.</p>
<pre><span class="comment"> /****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Solutions component.
**
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
****************************************************************************/</span>
#include <qmfcapp.h>
#include <qwinwidget.h>
#include <QtGui/QMessageBox>
#include <windows.h>
BOOL WINAPI DllMain( HINSTANCE hInstance, DWORD dwReason, LPVOID <span class="comment">/*lpvReserved*/</span> )
{
static bool ownApplication = FALSE;
if ( dwReason == DLL_PROCESS_ATTACH )
ownApplication = QMfcApp::pluginInstance( hInstance );
if ( dwReason == DLL_PROCESS_DETACH && ownApplication )
delete qApp;
return TRUE;
}</pre>
<p>The DLL entry point function <tt>DllMain</tt> uses the QMfcApp::pluginInstance function to make sure that exactly one instance of <a href="http://qt.nokia.com/doc/4.6/qapplication.html">QApplication</a> exists in the process, and that the DLL owning that instance stays loaded in memory.</p>
<pre> extern "C" __declspec(dllexport) bool showDialog( HWND parent )
{
QWinWidget win( parent );
win.showCentered();
QMessageBox::about( &win, "About QtMfc", "QtMfc Version 1.0\nCopyright (C) 2003" );
return TRUE;
}</pre>
<p>The <tt>C</tt> function <tt>showDialog</tt> is exported from the DLL and uses the <a href="qwinwidget.html">QWinWidget</a> class to provide proper stacking and modality between the native Win32 window and the <a href="http://qt.nokia.com/doc/4.6/qmessagebox.html">QMessageBox</a>.</p>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="30%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
<td width="40%" align="center"><a href="http://qt.nokia.com/doc/trademarks.html">Trademarks</a></td>
<td width="30%" align="right"><div align="right">Qt Solutions</div></td>
</tr></table></div></address></body>
</html>
|
