求WHY? if (!m_wndTree.GetSafeHwnd())

[绿豆蛙2013]

我原来的程序一直不能运行，加了一句就OK了，一时百思不得其解，请高人解释一下为何？

原程序：

void CMonitorView::OnSize(UINT nType, int cx, int cy) 
{
	CFormView::OnSize(nType, cx, cy);
	
	// TODO: Add your message handler code here
	m_iClientW = cx ; m_iClientH = cy ;
	m_wndTree.MoveWindow(0,0,100,100);
	m_1.MoveWindow(100,0,200,100);
}

修改后的：

void CMonitorView::OnSize(UINT nType, int cx, int cy) 
{
	CFormView::OnSize(nType, cx, cy);
	
	// TODO: Add your message handler code here
	m_iClientW = cx ; m_iClientH = cy ;
	if (!m_wndTree.GetSafeHwnd())//
	{
		return;
	}
	m_wndTree.MoveWindow(0,0,100,100);
	m_1.MoveWindow(100,0,200,100);
}

[oyljerry]

if (!m_wndTree.GetSafeHwnd())//
如果你的tree没有创建完成，就不要调整它的大小

[bohut]

Returns the window handle for a window. Returns NULL if the CWnd is not attached to a window or if it is used with a NULL CWnd pointer

[bylea]

[Quote=引用 1 楼 oyljerry 的回复:]
if (!m_wndTree.GetSafeHwnd())//
如果你的tree没有创建完成，就不要调整它的大小
[/Quote]

顶