doc/src/development/activeqt-dumpcpp.qdoc
author Eckhart Koeppen <eckhart.koppen@nokia.com>
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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/*! 
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    \page activeqt-dumpcpp.html
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    \title The dumpcpp Tool (ActiveQt)
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    \ingroup activeqt-tools
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    \keyword dumpcpp
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    The \c dumpcpp tool generates a C++ namespace for a type library.
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    To generate a C++ namespace for a type library, call \c dumpcpp with the following 
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    command line parameters:
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    \table
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    \header
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    \i Option
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    \i Result
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    \row
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    \i input
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    \i Generate documentation for \e input. \e input can specify a type library file or a type 
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    library ID, or a CLSID or ProgID for an object
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    \row
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    \i -o file
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    \i Writes the class declaration to \e {file}.h and meta object infomation to \e {file}.cpp
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    \row
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    \i -n namespace
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    \i Generate a C++ namespace \e namespace
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    \row
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    \i -nometaobject
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    \i Do not generate a .cpp file with the meta object information. 
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    The meta object is then generated in runtime.
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    \row
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    \i -getfile libid
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    \i Print the filename for the typelibrary \e libid to stdout
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    \row
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    \i -compat
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    \i Generate namespace with dynamicCall-compatible API
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    \row
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    \i -v
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    \i Print version information
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    \row
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    \i -h
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    \i Print help
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    \endtable
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    \c dumpcpp can be integrated into the \c qmake build system. In your .pro file, list the type 
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    libraries you want to use in the TYPELIBS variable:
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    \snippet examples/activeqt/qutlook/qutlook.pro 0
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    The generated namespace will declare all enumerations, as well as one QAxObject subclass 
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    for each \c coclass and \c interface declared in the type library. coclasses marked with 
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    the \c control attribute will be wrapped by a QAxWidget subclass.
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    Those classes that wrap creatable coclasses  (i.e. coclasses that are not marked 
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    as \c noncreatable) have a default constructor; this is typically a single class 
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    of type \c Application. 
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    \snippet doc/src/snippets/code/doc_src_activeqt-dumpcpp.qdoc 0
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    All other classes can only be created by passing an IDispatch interface pointer 
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    to the constructor; those classes should however not be created explicitly. 
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    Instead, use the appropriate API of already created objects.
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    \snippet doc/src/snippets/code/doc_src_activeqt-dumpcpp.qdoc 1
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    All coclass wrappers also have one constructors taking an interface wrapper class
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    for each interface implemented.
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    \snippet doc/src/snippets/code/doc_src_activeqt-dumpcpp.qdoc 2
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    You have to create coclasses to be able to connect to signals of the subobject.
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    Note that the constructor deletes the interface object, so the following will
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    cause a segmentation fault:
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    \snippet doc/src/snippets/code/doc_src_activeqt-dumpcpp.qdoc 3
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    If the return type is of a coclass or interface type declared in another type 
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    library you have to include the namespace header for that other type library 
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    before including the header for the namespace you want to use (both header have 
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    to be generated with this tool).
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    By default, methods and property returning subobjects will use the type as in 
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    the type library. The caller of the function is responsible for deleting or 
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    reparenting the object returned. If the \c -compat switch is set, properties 
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    and method returning a COM object have the return type \c IDispatch*, and 
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    the namespace will not declare wrapper classes for interfaces. 
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    In this case, create the correct wrapper class explicitly:
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    \snippet doc/src/snippets/code/doc_src_activeqt-dumpcpp.qdoc 4
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    You can of course use the IDispatch* returned directly, in which case you have to 
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    call \c Release() when finished with the interface.
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    All classes in the namespace are tagged with a macro that allows you to export
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    or import them from a DLL. To do that, declare the macro to expand to 
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    \c __declspec(dllimport/export) before including the header file.
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    To build the tool you must first build the QAxContainer library.
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    Then run your make tool in \c tools/dumpcpp.
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*/