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Communication from DLL to a application

Posted on 1998-06-15
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Last Modified: 2013-11-20
How can I call a function in the application from the DLL ?
Is it possible thro CALLBACK? If so please specify how?
Thank U
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Question by:aac
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IgorGrebnev earned 40 total points
ID: 1317957
Dear aac,

You can transfer the pointer to funciton in executable to DLL through pointer to function. The following code can be used
In EXE:

int ExportedFromEXEFunc()

{ return 0;
}

In DLL you should implement the following:

typedef int (*typePtrExpFunc)();

static typePtrExpFunc stm_pFunc = NULL;
 
declspec(_dllexport) void SetEXE_ExportedFunc( typePtrExpFunc pfExpFunc )

{stm_pFunc = pfExpFunc;
}

After calling the SetEXE_ExportedFunc from EXE and setting of static pointer to funciton in executable you can call the function through pointer anywhere in DLL:

(*stm_pFunc)();

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Author Comment

by:aac
ID: 1317958
Instead of using declspec to export the function can I use it directly in my .def file?
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