accessing a function from DLL

Hi ,

I have ex****ted the following  function from a dll ,

extern "C" DECL_MYEX****TS LRESULT CALLBACK MouseProc(int nCode,WPARAM 
wParam,LPARAM lParam);



//in my calling code , I tried to access the function as below:

static HINSTANCE hinstDLL;

typedef LRESULT (CALLBACK *MOUSEPROC)(int nCode,WPARAM wParam,LPARAM 
lParam);  // typedef a function pointer to access the function

hinstDLL =
LoadLibrary(_T("F:\\inter\\MyFirstDll\\debug\\MyFirstDll.dll")); 
//hInstDLL is  valid

MOUSEPROC hproc = (MOUSEPROC)GetProcAddress(hinstDLL,"MouseProc");  //
hProc 
is still NULL



Question:   I'm not able to access the function thru GetProcAddress. Is
the 
typedef  "typedef LRESULT (CALLBACK *MOUSEPROC)(int nCode,WPARAM 
wParam,LPARAM lParam); "   is corect or what is goin wrong here ?



Thanks



Sudhakar