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//问题1:
//左键按下后,画出来的图片是一片黑!!!
void CDrawTestDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
m_bLBDown = true;
Invalidate();
CDialog::OnLButtonDown(nFlags, point);
}
void CDrawTestDlg::OnPaint()
{
CPaintDC dc(this);
if ( m_bLBDown )
{
HBITMAP hChairBmpNew = (HBITMAP)LoadImage(AfxGetInstanceHandle(), "E:\\Games\\PlatForm\\OutPut\\PicData\\Table\\chair.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if( NULL != hChairBmpNew )
{
m_dcMem.CreateCompatibleDC( &dc );
BITMAP bmChailrInfo;
GetObject( hChairBmpNew , sizeof(BITMAP), &bmChailrInfo );
CBitmap Bitmap;
Bitmap.CreateCompatibleBitmap(&dc, bmChailrInfo.bmWidth, bmChailrInfo.bmHeight);
CBitmap * pOldBmp = m_dcMem.SelectObject(&Bitmap);
dc.BitBlt(100, 100, bmChailrInfo.bmWidth, bmChailrInfo.bmHeight, &m_dcMem, 0, 0, SRCCOPY);
m_dcMem.SelectObject(pOldBmp);
DeleteObject(hChairBmpNew);
}
}
}
//问题2:
//如果再点击一下的画,程序就会崩溃!
BOOL CDC::Attach(HDC hDC)
{
ASSERT(m_hDC == NULL); //崩溃在这里!!!
ASSERT(m_hAttribDC == NULL); // only attach to an empty DC
if (hDC == NULL)
{
return FALSE;
}
// remember early to avoid leak
m_hDC = hDC;
CHandleMap* pMap = afxMapHDC(TRUE); // create map if not exist
ASSERT(pMap != NULL);
pMap->SetPermanent(m_hDC, this);
SetAttribDC(m_hDC); // Default to same as output
return TRUE;
}