QMAKE custom DEFINES & CONFIG

[sheeeng]

Hi,

I'm new to Qt and its qmake functions. I have read through the Qt Assistant but I do not comprehend everything yet.

May I know how can we add custom DEFINES & CONFIG in the *.pro and *.pri files?

E.g.

win32 {
}
macx {
}

win32 {
}
macx {
}

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If I need a class in Windows only, can I do a *pro file as below? However, it is not working as I expected.

win32:DEFINES += WIN32_MYCLASS //(but not working also in qmake)
win32:CONFIG += win32_myclass //(but not working in *.cpp during #ifdef #endif)

win32:DEFINES += WIN32_MYCLASS //(but not working also in qmake)
win32:CONFIG += win32_myclass //(but not working in *.cpp during #ifdef #endif)

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Please advice. Thanks in advance.