Question

关于C++的消息响应函数

ON_WM_ERASEBKGND()
这个响应什么动作啊？

Answer 1

响应这个消息功能是擦除背景
参考：
BOOL CDisplayBmpBackGroundDlg::OnEraseBkgnd(CDC *pDC) //增加擦出背景函数
{
CRect rect;
GetClientRect(&rect);

CBitmap m_pBmp;
BITMAP bm;
CDC dcMem;

m_pBmp.LoadBitmap(IDB_BITMAP1);
m_pBmp.GetBitmap(&bm);//得到位图尺寸

dcMem.CreateCompatibleDC(pDC);
CBitmap* pOldBitmap = dcMem.SelectObject(&m_pBmp);
pDC->SetStretchBltMode(COLORONCOLOR);//这个模式不设置的话会导致图片严重失真
pDC->StretchBlt(0,0,rect.Width() ,rect.Height(),
&dcMem,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
dcMem.SelectObject(pOldBitmap);
return TRUE;
}

Answer 2

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MFC Library Reference
CWnd::OnEraseBkgnd
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Updated: November 2007
The framework calls this member function when the CWnd object background needs erasing (for example, when resized).

afx_msg BOOL OnEraseBkgnd(
CDC* pDC
);

Parameters
pDC
Specifies the device-context object.
Return Value
Nonzero if it erases the background; otherwise 0.
Remarks
看不明白追问。就是当窗口需要擦除时候，系统调用这个函数。可以把ON_WM_ERASEBKGND在MSDN里查一下。就能看见这个函数了。
另：http://baike.baidu.com/view/3988473.htm
请采纳！！有问题追问！