图形恢复问题，谢谢

[lgytj]

我在dialog的一个picture控件上绘图，图形能正常显示，但如果有其他窗口遮蔽图形就被擦掉了，我也用了Invalidate();但没用，请问应该怎么办？该用onpaint(）吗？在哪里用？怎么写？谢谢

[lambochan]

晕，放OnPaint()呀..（那个帖后面有呀，再贴一次吧~~，修改过的)

void COKDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
if(m_bIsShow)//位图已输出的话，遮住就重绘
Draw();
CDialog::OnPaint();
}
}

/*void COKDlg::OnButton1()
{
// TODO: Add your control notification handler code here
Draw();

}*/

void COKDlg::Draw()
{
CWnd *pWnd = GetDlgItem(IDC_XXXX);
CDC *pDC = pWnd->GetDC();

CDC dcMem;
CBitmap bitmap;
bitmap.CreateCompatibleBitmap(pDC,300,300);
dcMem.CreateCompatibleDC(pDC);
CBitmap *pOld = dcMem.SelectObject(&bitmap);

dcMem.FillRect(CRect(0,0,300,300),(CBrush *)dcMem.SelectStockObject(WHITE_BRUSH));
RECT *pRect=new RECT;
pWnd->GetClientRect(pRect);//这样GetClientRect
dcMem.Rectangle(pRect);
POINT *pP=new POINT;
pP->x=(pRect->bottom+pRect->top)/2;
pP->y=(pRect->left+pRect->right)/2;
//ClientToScreen(pP); //这两句需要吗？//这两句不需要
//ScreenToClient(pP);
dcMem.LineTo(*pP);
dcMem.TextOut(pP->x,pP->y,"111111");
pDC->BitBlt(0,0,pRect->right,pRect->bottom,&dcMem,0,0,SRCCOPY);

pWnd->ReleaseDC(pDC);//这样释放..
dcMem.SelectObject(pOld);
bitmap.DeleteObject();
dcMem.DeleteDC();

m_bIsShow = TRUE;//加个标记，初始化是FALSE，=TRUE为位图已输出;
}

[lgytj]

兄弟，又是你，呵呵，谢谢，上次没仔细看：（

[huanyun]

在OnPaint里面写 你的绘图要先放到一个内存兼容DC中
然后Bitbit出来