[C++]Game Hook Problem

FILE* file = fopen("logst.txt", "a");

//00F94699 > $ E8 70020000    CALL BLR.00F9490E

DWORD dwOvwrBytes = 0;

#define UObject_ProcessEvent 0x0044C770

UCanvas* pCanvas;
DWORD dwCallingObject = 0;

FColor MakeColor(int R, int G, int B, int A)
{
	FColor ReturnedColor;
	ReturnedColor.R = R;
	ReturnedColor.G = G;
	ReturnedColor.B = B;
	ReturnedColor.A = A;
	return ReturnedColor;
}

FColor Green = MakeColor(0,255,255,255);


UFunction* pFunction;
 void* pParms;
 void* pResult = NULL;

VOID WINAPI DispatchFunction()
{
	fprintf(file,"log : %s\n", "3");

    if(pFunction == NULL || pParms == NULL)
        return;

	fprintf(file,"log : %s\n", "4");

    if(!strcmp(pFunction->GetFullName(), "Function Engine.GameViewportClient.PostRender"))
    {
        pCanvas = ((UGameViewportClient_eventPostRender_Parms *)pParms)->Canvas;

        if(pCanvas != NULL)
        {
            pCanvas->CurX = 50;
            pCanvas->CurY = 50;
            pCanvas->DrawColor = Green;
            pCanvas->DrawText(L"y0o we draw here!!", NULL, 1.0f, 1.0f, NULL);
        }
    }
}

VOID __declspec(naked) ProxyFunction()
{
	fprintf(file,"log : %s\n", "5");
    __asm
    {
        mov dwCallingObject, ecx

        push edx
        mov edx, dword ptr [esp + 0x8]
        mov pFunction, edx
        mov edx, dword ptr [esp + 0xC]
        mov pParms, edx
        pop edx

        pushad
    }
	fprintf(file,"log : %s\n", "6");
    DispatchFunction();

    __asm
    {
        popad
        jmp [dwOvwrBytes]
    }
}

int __stdcall DllMain( HMODULE hModule, unsigned long dwReason, void* lpReserved )
{
		
	fprintf(file,"log : %s\n", "0");
    if ( dwReason == DLL_PROCESS_ATTACH )
    {		     
			fprintf(file,"log : %s\n", "1");
       dwOvwrBytes = (DWORD)DetourFunction((BYTE*)UObject_ProcessEvent, (BYTE*)ProxyFunction);
	   fprintf(file,"log : %s : %s\n", "1",dwOvwrBytes);
    }
		fprintf(file,"log : %s\n", "2");
    return TRUE;
}