MOVECURSOR رسم مستطیل

WM_MOUSEMOVE 

       Dim p As POINTAPI

       GetCursorPos p

       ScreenToClient hwnd, p

      Dim ff As RECT

      Dim ff1 As RECT

       SetRect ff, p.x, p.y, p.x, p.y

       ff.Left = p.x - 15

       ff.Top = p.y - 15

       ff.right = p.x + 35

       ff.bottom = p.y + 30

 DrawFrameControl GetDC(hwnd), ff, DFC_BUTTON, DFCS_BUTTONPUSH

       RoundRect GetDC(hwnd), ff.Left, ff.Top, ff.right, ff.bottom, 16, 16

      ( FillRect GetDC(hwnd), ff, GetSysColorBrush(16

        Sleep 100

       InvalidateRect hwnd, ff, 1

       UpdateWindow hwnd

         (ReleaseDC hwnd, GetDC(hwnd

UINT SetBoundsRect( HDC hdc, const RECT *lprect, 

(UINT flags : DCB_RESET ( Clear Bounding Rectangle 

(BOOL ValidateRect( HWND hWnd, const RECT *lpRect 

validates the client area within a rectangle by removing the rectangle from the update region of the specified window.

BOOL InvalidateRect( HWND hWnd, const RECT 

(*lpRect, BOOL bErase 

The InvalidateRect function adds a rectangle to the specified window's update region. The update region represents the portion of the window's client area that must be redrawn.

(BOOL UpdateWindow( HWND hWnd 

The UpdateWindow function updates the client area of the specified window by sending a WM_PAINT message to the window if the window's update region is not empty

(HDC GetDC( HWND hWnd 

The GetDC function retrieves a handle to a device context (DC) for the client area of a specified window or for the entire screen