OnDrawItem 注意如果在CButton基础上有虚函数 在类内直接通过该消息修改外观 有了hDC,CDC也有了，CDC有了，自绘还会远吗？ void CTestDlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct) { CDC ButtonDC; CBitmap bitmapTrans; BITMAP bmp; CRect rc; CDC mem;  ButtonDC.Attach(lpDrawItemStruct->hDC); mem.CreateCompatibleDC(&ButtonDC); rc=lpDrawItemStruct->rcItem; UINT state = lpDrawItemStruct->itemState; if(state & ODS_FOCUS) {  bitmapTrans.LoadBitmap(IDB_GETFOCUS);  bitmapTrans.GetBitmap(&bmp);  CBitmap  * old=mem.SelectObject(&bitmapTrans);  ButtonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);  mem.SelectObject(old);  bitmapTrans.DeleteObject();  ButtonDC.SetBkMode(TRANSPARENT);  ButtonDC.DrawText("已选中",&rc,DT_CENTER|DT_VCENTER|DT_SINGLELINE);   } else {  bitmapTrans.LoadBitmap(IDB_GETFOCUS);  CBitmap *old2 =mem.SelectObject(&bitmapTrans);  bitmapTrans.GetBitmap(&bmp);  CBitmap *old=mem.SelectObject(&bitmapTrans);  ButtonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);  ButtonDC.SetBkMode(TRANSPARENT);  ButtonDC.DrawText("未选中",&rc,DT_CENTER|DT_VCENTER|DT_SINGLELINE);  mem.SelectObject(old2);  bitmapTrans.DeleteObject(); }  CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);}

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