Using Qt to write Cross Platform Library

[ball]

is anybody know how to use Qt to write cross-platform class library(not a stand-alone program), to be called by other Qt program?

that is, i can use QObject like QString inside the functions in my library, and still can be identify by other Qt program once it has been loaded by QLibrary

[Beluvius]

Yes, you can create a cross platform library, similar to any other library. What you should do is compile the library as normal on every platform and supply a header file with the definitions of the interface to the library (also as normal). By including that header file in the program, the classes/functions/etc in the library are known and the library can be linked to the program during linking.

So, basically you need to create the following:
libLinux.a
libLinux64.a
libSunOs.a
libDefinitions.h

We do this all the time, but then with modules in the development tree.

You can also create a dynamic library, but I don't have any experience with that.

[wysota]

Add "TEMPLATE = lib" to your project file. If you want your library to be loadable by QLibrary, you also have to make sure that all functions in that library are declared as extern "C":

extern "C" {
  void func1();
  void func2();
  void func3();
  //...
}

extern "C" {
  void func1();
  void func2();
  void func3();
  //...
}

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