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Though the code for entering signal and slot functions, as well as that for making the connections, may appear straightforward to the programmer, it actually requires much more complex C++ coding. Signal and slot functions need to be preprocessed by the Meta-Object Compiler (MOC) to generate the C++ code that can implement the signal and slot messageconnection process. You then include the output of MOC in your source code file for compiling. This means that you should place the class declarations for any classes that have
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signals and slots in separate header files. You can then preprocess these header files and include the output in the source code. You cannot combine the member function definitions with the class declaration. To compile, the class declaration has to first be preprocessed by MOC before it can be combined correctly with the member function definitions. This necessitates placing the class declaration in a separate file from the member functions so that the class declaration can be separately preprocessed by MOC. To declare a class that contains either signals or slots, you would first declare the class in a header file like myobj.h. You do not place the definitions of any of the member functions in the header file, only the class declaration. Note that the class declaration will include declarations of the member functions, structures, and variables. In a separate source code file, you would place the definition of member functions, like myobj.cpp. A member function definition is the actual code for the function. For these definitions to be correctly compiled, you have to include the MOC preprocessed version of its object declaration, not the actual declaration itself. To generate the preprocessed MOC versions, you use the class declaration header file and the moc command, like this:
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moc myobj.h o myobj.moc
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In the particular source code files where you are defining member functions for this object, you would include the MOC version of the header file that contains the object declaration, not the header file itself. So you would include myobj.moc in the myobj.cpp source code file, not myobj.h. However, for any other source code files where you are generating an object of that class say, with a new operation you just include the header file, not the MOC file. So, for any source code file where you only need the class declaration, you include the header file, such as myobj.h. For example, suppose in the main.cpp file a myobj object is generated as a variable, whereas in a myobj.cpp file there are function definitions for member functions for the myobj class. Furthermore, suppose the class definition for myobj is in the myobj.h header file and the MOC version of myobj.h is in the myobj.moc file. In the main.cpp file, you would include the myobj.h file (not myobj.moc), but in the myobj.cpp file you would include the myobj.moc file (not myobj.h).
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hellowin.cpp is a simple program that displays a button in the main window and then will display a message box with "Hello World" when clicked. The Hellowin class will have two slots declared: myhello (to display the message) and myexit (to exit the program). The declaration should also include Q_OBJECT. Q_OBJECT is a special object used by KDE to connect to the Qt Toolkit objects. The declaration for Hellowin will be placed in the hellowin.h header file, and all the member function definitions will be placed in the hellowin.cpp file. Figure 13 shows both the main window with its Exit and Hello buttons and the hello window displayed by this program.
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Figure 13: KDE Hellowin program To compile this program, you first need to preprocess the hellowin.h header file with MOC. Then, you can compile the hellowin.cpp file. Notice that this file should include the hellowin.moc file, not the hellowin.h file. The compile operations are shown here:
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