DllMain() is the entry point of any Win32 DLL. The function prototype and description are as follows.
BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved);
Return value: 0 for success, non zero for error.
APIENTRY- tells the compiler that it is an external/exported function.
hModule- This is the instance handle of the Loaded DLL.
ul_reason_for_call- reason for calling this DllMain() from Win32 subsystem
lpReserved- reserved variable.
ul_reason_for_call can have the following values
- DLL_PROCESS_ATTACH (value 1) - when a process attaches to the DLL
- DLL_THREAD_ATTACH (value 2) - when a thread attaches to the DLL
- DLL_THREAD_DETACH (value 3) - when a thread detaches from the DLL
- DLL_PROCESS_DETACH (value 0) - when a process detaches from the DLL
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