a windows API function to convert JPG into BMP [modified]

[V_shr]

topic says all :D is there any? thnx

[Chris Losinger]

there are dozens. did you try searching this site? or Google?

image processing toolkits | batch image processing

[V_shr]

i searched ... nothing , i wonder maybe i use bad key words !

[V_shr]

actually i searched in articles for "jpg to bmp API" the answers was s.th else ! for example changing icons to ... !!! i also looked in my API book but i couldnt find , man plz hlp

[Mark Salsbery]

If you don't need to write the JPEG decompression yourself, here's the simplest way I know:

#include <atlimage.h>
...
// (error handling omitted)
CImage image;
image.Load(_T("c:\\some.jpg"));
image.Save(_T("c:\\some.bmp"), ImageFormatBMP);

Mark

Mark Salsbery Microsoft MVP - Visual C++ :java:

[V_shr]

do u know where can i get atlimage.h ??? CImage is a new class included with VC7 i think, but i use BC++ :( -- modified at 17:26 Thursday 25th October, 2007

[Mark Salsbery]

V_shr wrote:

CImage is a new class included with VC7 i think, but i dont use VisualStudio.NET

:doh: Ok, try this ...

ULONG dwToken;
    Gdiplus::GdiplusStartupInput input;
    Gdiplus::GdiplusStartupOutput output;
    Gdiplus::Status status = Gdiplus::GdiplusStartup(&dwToken, &input, &output);
    if(status == Gdiplus::Ok)
    {
        Gdiplus::Bitmap *pBitmap = new Gdiplus::Bitmap(L"c:\\some.jpg", FALSE);
        CLSID bmpClsid;
        GetEncoderClsid(L"image/bmp", &bmpClsid);
        pBitmap->Save(L"c:\\some.bmp", &bmpClsid);
        delete pBitmap;

Gdiplus::GdiplusShutdown(dwToken);
    }

I took the GetEncoderClsId() function right from the GDI+ docs in the Platform SDK. It looks like this:

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
}

Mark

[V_shr]

thnx , here its 3:00 pm , ill try it tomarrow :D

[Paresh Chitte]

Please refer this[^]. Hope this will solve your purpose. Regards, Paresh.