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151 lines
7.5 KiB
151 lines
7.5 KiB
14 years ago
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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>Qt Motif Extension - A Migration Walkthrough</h1>
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[ <a href="motif-walkthrough-1.html">Next: Getting Started</a> ]
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<p> This walkthrough covers a complete migration of a <a href="motif-extension.html#Motif">Motif</a> based program
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to the Qt toolkit using the <em>Qt Motif Extension</em>.
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<p> It is rarely practical for a large project with hundreds of thousands
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or even millions of lines of code to be migrated all at once; such an
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endeavor would require too many development resources and would incur
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significant risks. Every line of code would have to be rewritten,
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every user interface redesigned, and quality assurance tests and
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procedures all rewritten. The <em>Qt Motif Extension</em> provides a
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complete and working solution for incremental migration that can be
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paced to suit each individual project and the available resources. The
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user interface and related code can be migrated in steps while the
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rest of the project need not be changed at all.
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<p> This walkthrough is intended for programmers who will be migrating an
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existing Motif based project to the Qt toolkit. We assume that they
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have experience with C/C++ and Xt/Motif. Some experience with the Qt
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toolkit is also necessary. For developers completely new to Qt we
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recommend following the learning plan outlined in <a href="how-to-learn-qt.html">How to Learn Qt</a>; or to go on a Qt
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training course. (See <a href="http://www.trolltech.com">http://www.trolltech.com</a> for
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details of training courses.)
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<p> <h2> Goals for the Walkthrough
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</h2>
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<a name="1"></a><p> The goal of this walkthrough is to provide the reader with enough
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knowledge to migrate Motif applications to the Qt toolkit. We will do
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this by example: We will convert a real-world Motif based program
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step-by-step. This walkthrough will discuss both techniques and their
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rationales throughout the process. This walkthrough is broken down
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into individual chapters which cover a specific topic:
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<p> <ul>
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<li> Chapter 1: <a href="motif-walkthrough-1.html">Getting Started</a>
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<li> Chapter 2: <a href="motif-walkthrough-2.html">Preparing to Migrate the User Interface</a>
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<li> Chapter 3: <a href="motif-walkthrough-3.html">Using Qt Standard Dialogs</a>
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<li> Chapter 4: <a href="motif-walkthrough-4.html">Using Custom QDialogs</a>
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<li> Chapter 5: <a href="motif-walkthrough-5.html">Using Existing Dialogs with QMotifDialog</a>
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<li> Chapter 6: <a href="motif-walkthrough-6.html">Using Qt Main Window Classes</a>
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<li> Chapter 7: <a href="motif-walkthrough-7.html">Refactoring Existing Code</a>
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<li> Chapter 8: <a href="motif-walkthrough-8.html">Replacing the View Widget</a>
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<li> Chapter 9: <a href="motif-walkthrough-9.html">Replacing the Print Dialog</a>
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<li> Chapter 10: <a href="motif-walkthrough-10.html">Continuing Development</a>
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</ul>
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<p> We will use the <em>todo</em> demo program included with the Motif 2.x
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distribution as our migration project. This walkthrough contains
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references to the source code, which is included in the <tt>extensions/motif/examples/walkthrough</tt> subdirectory.
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<p> <h2> Prerequisites
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</h2>
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<a name="2"></a><p> Before we can start using the <em>Qt Motif Extension</em>, we must satisfy
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these requirements:
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<p> <ol type=1>
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<li> We are using the X11R6.x and Motif 2.x libraries.
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<li> The project is compilable by a C++ compiler.
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<li> We have built and installed the <em>Qt Motif Extension</em>.
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<li> We have built and linked the project with the Qt toolkit and the <em>Qt Motif Extension</em>
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</ol>
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<p> <h3> X11R6.x and Motif 2.x Libraries
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</h3>
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<a name="2-1"></a><p> The mechanisms used by the <em>Qt Motif Extension</em> require development
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headers and libraries from the X11R6 release and the Motif 2.0
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release. Newer versions of these can also be used.
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<p> <h3> C++ Compiler
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</h3>
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<a name="2-2"></a><p> Since Qt is a C++ toolkit, all new code will be written in C++. In
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order for existing code to coexist with new code, a C++ compiler must
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be able to compile the existing code.
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<p> It is possible to keep existing code and new code separate, and only
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convert or rewrite existing code as needed. This is a normal part
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of the migration process, and does not need to be done before the
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migration process begins. This is the most common scenario, and we
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will demonstrate it by migrating existing C code to C++ as needed in
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this walkthrough.
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<p> <h3> Build and Install the Qt Motif Extension
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</h3>
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<a name="2-3"></a><p> The <em>Qt Motif Extension</em> is not built and installed along with the
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Qt toolkit. The extension resides in the <tt>extensions/motif</tt>
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subdirectory. Run <em>make</em> in this directory to build the extension
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and the examples. Once the extension has been built, run <em>make install</em>.
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<p> <pre>
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$ cd extensions/motif
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$ make
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$ make install
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</pre>
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<p> The <em>Qt Motif Extension</em> is now installed and ready to use.
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<p> <h3> Build and Link the Project with the Qt Toolkit and the Qt Motif Extension
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</h3>
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<a name="2-4"></a><p> For simplicity, we use <em>qmake</em> to create the <tt>Makefile</tt>. The <tt>-project</tt> option causes <em>qmake</em> to automatically generate a project
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file. After <em>qmake -project</em> has generated our project file, we
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run <em>qmake</em> again to generate a <tt>Makefile</tt>. Now, we can just run <em>make</em> to build our project.
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<p> <pre>
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$ qmake -project
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$ qmake
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$ make
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</pre>
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<p> Everything builds correctly, but fails to link because we don't link
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with the Motif library. We tell <em>qmake</em> to do this by adding the <tt>-lXm</tt> to the <tt>LIBS</tt> variable in our project file. Since we are
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planning to use the <em>Qt Motif Extension</em> in this project as well,
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we should also add <tt>-lqmotif</tt> to the list of libraries.
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<p> <pre>
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LIBS += -lXm -lqmotif
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</pre>
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<p> Now we regenerate our <tt>Makefile</tt> by running <tt>qmake</tt> again, and
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rebuild using <tt>make</tt>. This time, our project successfully links, and
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the application runs as expected.
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<p> We are now ready to start using the <em>Qt Motif Extension</em>.
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<p> [ <a href="motif-walkthrough-1.html">Next: Getting Started</a> ]
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<p>
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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>Qt 3.3.8</div>
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</table></div></address></body>
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