CWnd::UpdateWindow
要經由傳送的訊息 WM_PAINT 更新工作區，如果更新區域不是空的。
void UpdateWindow( );
備註
UpdateWindow 成員函式立即傳送 WM_PAINT 資訊，略過應用程式佇列。 如果更新區域是空的， WM_PAINT 不會傳送訊息。
範例
// In this example a rectangle is drawn in a view.
// The OnChangeRect() function changes the dimensions
// of the rectangle and then calls CWnd::Invalidate() so the
// client area of the view will be redrawn next time the
// window is updated. It then calls CWnd::UpdateWindow
// to force the new rectangle to be painted.
void CMdiView::OnChangeRect()
{
// Change Rectangle size.
m_rcBox = CRect(20, 20, 210, 210);
// Invalidate window so entire client area
// is redrawn when UpdateWindow is called.
Invalidate();
// Update Window to cause View to redraw.
UpdateWindow();
}
// On Draw function draws the rectangle.
void CMdiView::OnDraw(CDC* pDC)
{
// Other draw code here.
pDC->Draw3dRect(m_rcBox, 0x00FF0000, 0x0000FF00);
}
需求
Header: afxwin.h