关于MDI显示图片的问题？

cooljw 2005-05-29 08:05:19

我想在读取一张图后对其进行编辑，把编辑后的结果显示在另一个子窗口中，如何办到呢？
这是我读图片的函数：
CFile file(strFilePathName,CFile::modeRead|CFile::shareDenyWrite);
CArchive ar(&file,CArchive::load|CArchive::bNoFlushOnDelete);
CArchiveStream stream(&ar);
HRESULT hr = OleLoadPicture((IStream*)&stream, 0, FALSE, IID_IPicture, (void **)&m_pPic);

file.Close();

CRect ShowRect;
pDC=GetDC();
GetClientRect(&ShowRect);
long lWidth,lHeight;

m_pPic->get_Width((OLE_XSIZE_HIMETRIC*)&lWidth);
m_pPic->get_Height((OLE_YSIZE_HIMETRIC*)&lHeight);
CDC tempDC;
tempDC.CreateCompatibleDC(pDC);

bmp.CreateCompatibleBitmap(pDC,ShowRect.Width(),ShowRect.Height());
CBitmap *OldBmp=tempDC.SelectObject(&bmp);
m_pPic->Render(tempDC, 0, 0, ShowRect.Width(), ShowRect.Height(),
0, lHeight, lWidth, -lHeight, NULL);
m_pPic->Release();

pDC->BitBlt(ShowRect.left, ShowRect.top, ShowRect.Width(), ShowRect.Height(), &tempDC, 0, 0, SRCCOPY);
tempDC.SelectObject(OldBmp);
ReleaseDC(&tempDC);
bmp.DeleteObject();
ReleaseDC(pDC);

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