CWnd::UpdateWindow
通过发送 WM_PAINT 信息更新工作区，如果更新区域不为null。
void UpdateWindow( );
备注
UpdateWindow 成员函数直接发送 WM_PAINT 信息，而绕过应用程序队列。 如果更新区域为空，不发送 WM_PAINT。
示例
// 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);
}
要求
Header: afxwin.h