利用::ClientToScreen将RECT转换为屏幕坐标

typedef struct tagPOINT {
  LONG x;
  LONG y;
} POINT, *PPOINT;
typedef struct _RECT {
  LONG left;
  LONG top;
  LONG right;
  LONG bottom;
} RECT, *PRECT;

BOOL ClientToScreen(
  _In_     HWND hWnd,
  _Inout_  LPPOINT lpPoint
);

//利用::ClientToScreen将RECT转换为屏幕坐标

RECT rctDest;

::GetClientRect(hWnd,&rctDest);

::ClientToScreen(hWnd, (LPPOINT)&rctDest.left);

::ClientToScreen(hWnd, (LPPOINT)&rctDest.right);