그림을 그렷는데화면에 투명화시키려 하는데 투명화가안되요
비트맵을불러와서 핸들에뿌렸거든요
그런데 투명화하려는데 투명화가 되지않아요어떻게 하는지 알려주세요

#define DLLSP __declspec(dllexport)
extern "C" DLLSP void __stdcall Win_Angle(const AnsiString FileName);
//extern "C" DLLSP int __stdcall Get_Hook();

#pragma argsused
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
    return 1;
}
//---------------------------------------------------------------------------
void __stdcall Win_Angle(const AnsiString FileName)
{
        HWND H = FindWindow(NULL,"팡야:시즌4");
        if(H ==NULL) return;
        else{
        HDC DC = GetDC(H);
        Graphics::TBitmap *wa=new Graphics::TBitmap;
        wa->LoadFromFile(FileName);  
                                wa->Transparent = true;             <----여기이렇게
        wa->TransparentColor = clWhite; <---여기도 이렇게했는뎅 안되요
        BitBlt(DC,0,0,800,600,wa->Canvas->Handle,0,0,SRCCOPY);
        ReleaseDC(H, DC);
            }
}
dll내부소스에요