<b>在VC下显示JPEG、GIF格式图像的一种简便方法</b>

LPVOID pvData = NULL;

if (hGlobal != NULL)

{

if ((pvData = GlobalLock(hGlobal)) != NULL)

{

file.ReadHuge(pvData, cb);

GlobalUnlock(hGlobal);

CreateStreamOnHGlobal(hGlobal, TRUE, &pStm);

}

}

}

然后，就直接调用OleLoadPicture函数从流中装载图像：

IPicture *pPic;

……

OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic));

由于该函数有时会导致失败，所以应当用SUCCEEDED宏来做一些适当的保护工作,只有在数据装载成功的前提下才能继续下面的图像显示工作：

if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic)))

{

OLE_XSIZE_HIMETRIC hmWidth;

OLE_YSIZE_HIMETRIC hmHeight;

pPic-＞get_Width(&hmWidth);

pPic-＞get_Height(&hmHeight);

double fX,fY;

……

fX = (double)pDC-＞GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC-＞GetDeviceCaps(HORZSIZE)*100.0);