【MFC编程】MFC动态加载图片

void CMFCDemoDlg::OnInsertImage()
{
	CFileDialog dlg(TRUE,_T("jpg"),_T("*.jpg"), OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,   
		_T("JPEG文件(*.jpg)|*.jpg|GIF文件(*.gif)|*.gif|bmp文件(*.bmp)|*.bmp|"), NULL);

	if(dlg.DoModal()!=IDOK)
		return;
	
	((CStatic*)GetDlgItem(IDC_STATIC_PICTURE))-> ModifyStyle(0xF,SS_BITMAP|SS_CENTERIMAGE); 
	
	m_strImgPath = dlg.GetPathName();

	CDC *pDC=NULL;  
	pDC = GetDlgItem(IDC_STATIC_PICTURE)->GetDC();  
	DrawImg(pDC, m_strImgPath, 0, 0);  

	ReleaseDC(pDC); // 记得释放资源，不然会导致内存泄露  
}

void CMFCDemoDlg::DrawImg(CDC* pDC,CString strPath, int x, int y)
{
	IPicture *pPic=NULL;   
	OleLoadPicturePath(CComBSTR(strPath.GetBuffer()), (LPUNKNOWN)NULL, 0, 0, IID_IPicture,(LPVOID*)&pPic);  
	if (NULL == pPic)  
	{  
		return;  
	}  

	// 获取图像宽和高,注意这里的宽和高不是图像的分辨率  
	OLE_XSIZE_HIMETRIC hmWidth;    
	OLE_YSIZE_HIMETRIC hmHeight;    
	pPic->get_Width(&hmWidth);    
	pPic->get_Height(&hmHeight);    

	// 获取显示图片窗口的宽度和高度  
	RECT rtWnd;  
	pDC->GetWindow()->GetWindowRect(&rtWnd);  
	int iWndWidth = rtWnd.right - rtWnd.left;  
	int iWndHeight = rtWnd.bottom - rtWnd.top;
	if(m_bPrintFlag)
	{
		iWndHeight = iWndHeight * 10;
		iWndWidth = iWndWidth * 10;
	}

	if(FAILED(pPic->Render(*pDC, x, y, iWndWidth, iWndHeight, 0, hmHeight, hmWidth, -hmHeight, NULL)))    
	{  
		pPic->Release();  
		return;  
	}  

	//记得释放资源，不然会导致内存泄露  
	pPic->Release();   

	return;  
}