使用InvalidateRect函数就可以了。 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 InvalidateRect( HWND hWnd, // handle of window with changed update region CONST RECT *lpRect, // address of rectangle coordinates BOOL bErase // erase-background flag );ParametershWnd Handle to the window whose update region has changed. If this parameter is NULL, the system invalidates and redraws all windowslpRect Pointer to a RECT structure that contains the client coordinates of the rectangle to be added to the update region. If this parameter is NULL, the entire client area is added to the update region. bErase Specifies whether the background within the update region is to be erased when the update region is processed. If this parameter is TRUE, the background is erased when the BeginPaint function is called. If this parameter is FALSE, the background remains unchanged例子: CRect rect; memset(&rect, 0, sizeof(CRect)); this->GetClientRect(&rect); InvalidateRect(rect);
void InvalidateRect( LPCRECT lpRect, BOOL bErase = TRUE );
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 InvalidateRect(
HWND hWnd, // handle of window with changed update region
CONST RECT *lpRect,
// address of rectangle coordinates
BOOL bErase // erase-background flag
);ParametershWnd
Handle to the window whose update region has changed. If this parameter is NULL, the system invalidates and redraws all windowslpRect
Pointer to a RECT structure that contains the client coordinates of the rectangle to be added to the update region. If this parameter is NULL, the entire client area is added to the update region.
bErase
Specifies whether the background within the update region is to be erased when the update region is processed. If this parameter is TRUE, the background is erased when the BeginPaint function is called. If this parameter is FALSE, the background remains unchanged例子:
CRect rect;
memset(&rect, 0, sizeof(CRect));
this->GetClientRect(&rect);
InvalidateRect(rect);