Hello!
For example, i have a little function in dll:
void dll_func(){
char buf[32];
char* p = "qwerty";
strcpy(buf,p);
// or
GetLastError();
}

I call GetProcAddress("dll_func") and call got function.
If it happened in nonservice application, then dll_func works OK.
But if service calls dll_func, then it get access violation in strcpy.
In service debug window I see that [p = "qwerty";] - is unreadable pointer.
The same if dll_func contains only GetLastError() call - it get access violation.
I suspect that dll data segment was loaded incorrectly or did not loaded at all when dll was loaded fom service.
Anybody, could you help me!