多文档界面更换背景出现断言错误
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CMDIFrameWndEx::OnCreate(lpCreateStruct) == -1)
return -1;
if (m_wndClient.SubclassWindow(m_hWndMDIClient))
{
return -1;
}

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