问一个很简单的图像读取显示的问题

[chriswwl]

帮忙举一个实际点的例子
比如读取和显示e:\1.jpg的图像

程序怎么写？

[FengYuanMSFT]

IPicture * LoadPicture(LPCTSTR szFile)
{
// open file
HANDLE hFile = CreateFile(szFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);

if (INVALID_HANDLE_VALUE == hFile)
{
return NULL;
}
else
{
// get file size
int nFileSize = GetFileSize(hFile, NULL);

IPicture * pPicture = NULL;

if (nFileSize > 0)
{
// alloc memory based on file size
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nFileSize);

LPVOID pvData = GlobalLock(hGlobal);

DWORD dwBytesRead = 0;
// read file and store in global memory
BOOL bRead = ReadFile(hFile, pvData, nFileSize, &dwBytesRead, NULL);

GlobalUnlock(hGlobal);

LPSTREAM pstm = NULL;

HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);

assert(SUCCEEDED(hr) && pstm);

hr = ::OleLoadPicture(pstm, nFileSize, FALSE, IID_IPicture, (LPVOID *)&pPicture);
assert(SUCCEEDED(hr) && pPicture);

pstm->Release();

}

CloseHandle(hFile);

return pPicture;
}
}


pPicture->Render(hdc, dx, dy, w, h, 0, bmHeight, bmWidth, -bmHeight, NULL);