如何是應用程式界面以任意透明度顯示

SetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE,GetWindowLong(this->GetSafeHwnd(),GWL_EXSTYLE)^0X80000);

 HINSTANCE hInst=LoadLibrary("User32.DLL");

 if(hInst)

 {

  typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD);

  MYFUNC fun=NULL;

  fun=(MYFUNC)GetProcAddress(hInst,"SetLayeredWindowAttributes");

  if(fun)

   fun(this->GetSafeHwnd(),250,50,2);

  FreeLibrary(hInst);