求如何获得jpg格式的图片的BMP数据

[zkhraul]

求如何获得jpg格式的图片的BMP数据,我现在需要获得jpg的各个象素的RGB值,我以前在vc是用jpgelib库解码,想问问在mobile上还是只能这么做吗

[zkhraul]

这种方法不行,下午用imaging转换下得到了bmp数据

[世外涛缘]

楼主既然解决了，能不能详细说明下呢？
学习。

[儿大不由爷]

HBITMAP SHLoadImageFile (
LPCTSTR pszFileName
);

[MS_Frank]

以前我写的一段代码。

/*
 * 下载并转换图像为标准位图格式
 * 成功返回宽（低字节），高（高字节），失败返回0
*/
LONG ConvertImage(LPCTSTR lpstrImgUrl,HBITMAP *hBitmap)
{
	CHttpRequest httpRequ;
	if(!InitHttpRequest(&httpRequ))return FALSE;
	
	//下载图片
	if(!httpRequ.OpenConnect(lpstrImgUrl,CHttpRequest::RequestType::GET))return FALSE;
	if(!httpRequ.SendRequest())return FALSE;
	
	DWORD dwLen=0;
	BYTE *byData=NULL;
	if(!httpRequ.ReadData(NULL,&dwLen))return FALSE;
	byData=new BYTE[dwLen];
	if(!httpRequ.ReadData(byData,&dwLen)) goto End;

	///解码图像
	LONG lRetn=0;
	IImage *pImage=NULL;
	IImagingFactory *pImagingFactory=NULL;
	HRESULT hrCoInit;
	HDC hdcCont=NULL,hdcMem=NULL;

	if (FAILED(hrCoInit=CoInitializeEx(NULL, COINIT_MULTITHREADED)))goto End;
	if(FAILED(CoCreateInstance(CLSID_ImagingFactory,NULL,CLSCTX_INPROC_SERVER,IID_IImagingFactory,(void**) &pImagingFactory)))goto End;
	if(FAILED(pImagingFactory->CreateImageFromBuffer(byData,dwLen,BufferDisposalFlag::BufferDisposalFlagCoTaskMemFree,&pImage)))goto End;
	
	ImageInfo imgInfo;
	if(FAILED(pImage->GetImageInfo(&imgInfo)))goto End;
	
	//将解码后的图像画入内存DC中
	hdcCont=GetDC(NULL);
	*hBitmap=CreateCompatibleBitmap(hdcCont,imgInfo.Width,imgInfo.Height);
	hdcMem=CreateCompatibleDC(hdcCont);
	SelectObject(hdcMem,*hBitmap);
	RECT rect={0,0,imgInfo.Width,imgInfo.Height};
	pImage->Draw(hdcMem,&rect,NULL);

	//返回位置的宽，高
	lRetn=MAKELONG(imgInfo.Width,imgInfo.Height);

End:
	if(hdcMem)DeleteDC(hdcMem);
	if(hdcCont)DeleteDC(hdcCont);
	if(pImage)pImage->Release();
	if(pImagingFactory)pImagingFactory->Release();
	if(byData)delete[] byData;
	if(SUCCEEDED(hrCoInit))CoUninitialize();

	return lRetn;
}