Question

vc下如何读入jpg图片，用什么函数？

Answer 1

使用GDI+很方便

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
UINT num = 0; // number of image encoders
UINT size = 0; // size of the image encoder array in bytes

ImageCodecInfo* pImageCodecInfo = NULL;

GetImageEncodersSize(&num, &size);
if(size == 0)
return -1; // Failure

pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
if(pImageCodecInfo == NULL)
return -1; // Failure

GetImageEncoders(num, size, pImageCodecInfo);

for(UINT j = 0; j < num; ++j)
{
if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
{
*pClsid = pImageCodecInfo[j].Clsid;
free(pImageCodecInfo);
return j; // Success
}
}

free(pImageCodecInfo);
return -1; // Failure
}
youfunc()
{
//...关键语句
Gdiplus::Bitmap bmp((BITMAPINFO *)&header,(void *)pPixelData);
CLSID Clsid;
GetEncoderClsid(L"image/jpeg",&Clsid);
bmp.Save(strPath,&Clsid,0);
}