[SDK] How to save a HBITMAP with MMF2 filters ?

I have actually a HBITMAP and I would like to know how can I save it as a picture file thanks to MMF2 filters.
Thanks for the help. :)

HBITMAP to a cSurface? This should work:

Code:

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// HBITMAP hBitmap; (this is your bitmap)
cSurface srf;
HDC hDC = srf.GetDC ();
BITMAPINFO bmpInfo;
LPBYTE pBuf;

GetDIBits (hDC, hBitmap, 0, 0, NULL, &bmpInfo, DIB_RGB_COLORS);

if (bmpInfo.bmiHeader.biSizeImage <= 0)
  bmpInfo.bmiHeader.biSizeImage =
    bmpInfo.bmiHeader.biWidth * abs(bmpInfo.bmiHeader.biHeight)
    * (bmpInfo.bmiHeader.biBitCount + 7) / 8;
pBuf = new BYTE[bmpInfo.bmiHeader.biSizeImage];         
bmpInfo.bmiHeader.biCompression = BI_RGB;
GetDIBits (hDC, hBitmap, 0, bmpInfo.bmiHeader.biHeight, pBuf, &bmpInfo, DIB_RGB_COLORS);

srf.ReleaseDC ();
srf.LoadImage (&bmpInfo, pBuf);
delete [] pBuf;

// srf contains the image in the HBITMAP

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Not investigated MMF's filters though, so can't help with that...

This won't work if the HBITMAP is in 256 colors, you have to dynamically allocate bmpInfo : sizeof(BITMAPINFO) + 256 * sizeof(RGBQUAD).

Thanks a lot. :)

How can I know if the HBitmap is in 256 ?

Maybe you have an example to manage fullcolors and indexed pictures ? ;)

Thanks a lot for your help. :)

No need to know it, just allocate the memory and let the GetDIBits and LoadImage functions to handle it. :)

Yeah. THanks, I'll try it today. :D

I get several errors, when I try to use filters... When I include "ImgFlt.h" in "Common.h" :

Code:

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..\..\Inc\ImgFlt.h(14) : error C2061: syntax error : identifier 'CImageFilter'
..\..\Inc\ImgFlt.h(15) : error C2061: syntax error : identifier 'CImageFilter'
..\..\Inc\ImgFlt.h(16) : error C2061: syntax error : identifier 'CImageFilter'
..\..\Inc\ImgFlt.h(17) : error C2061: syntax error : identifier 'CImageFilter'
..\..\Inc\ImgFlt.h(18) : error C2061: syntax error : identifier 'CImageFilter'
..\..\Inc\ImgFlt.h(19) : error C2061: syntax error : identifier 'CImageFilter'

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How do you dynamically allocate memory for "bmpInfos" ? I try:

Code:

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BITMAPINFO bmpInfo = (BITMAPINFO*)malloc(sizeof(BITMAPINFO) + 256 * sizeof(RGBQUAD));

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But it says :

Code:

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error C2440: 'initializing' : cannot convert from 'struct tagBITMAPINFO *' to 'struct tagBITMAPINFO'

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Thanks... :)

Ok, I've corrected the bug to allocate (I'm too bad sometimes :D) :

Code:

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//MMF2 Surface
        cSurface srf;
        //File name
        LPSTR filePath = (LPSTR)param1;
       
        //Conversion HBitmap en DIB
        HDC hDC = srf.GetDC();
        LPBITMAPINFO bmpInfo = (LPBITMAPINFO)malloc(sizeof(BITMAPINFO) + 256 * sizeof(RGBQUAD));
        LPBYTE pBuf;

        //memset((void*)&bmpInfo,0,sizeof(BITMAPINFO) + 256 * sizeof(RGBQUAD));

        GetDIBits(hDC, rdPtr->hIcon, 0, 0, NULL, bmpInfo, DIB_RGB_COLORS);

        if(bmpInfo->bmiHeader.biSizeImage <= 0)
          bmpInfo->bmiHeader.biSizeImage =
                bmpInfo->bmiHeader.biWidth * abs(bmpInfo->bmiHeader.biHeight)
                * (bmpInfo->bmiHeader.biBitCount + 7) / 8;
        pBuf = new BYTE[bmpInfo->bmiHeader.biSizeImage];         
        bmpInfo->bmiHeader.biCompression = BI_RGB;
       
        //Conversion DIB en MMF2 Surface
        GetDIBits(hDC, rdPtr->hIcon, 0, bmpInfo->bmiHeader.biHeight, pBuf, bmpInfo, DIB_RGB_COLORS);
       
        //Libération mémoire
        srf.ReleaseDC(hDC);
        srf.LoadImage(bmpInfo, pBuf);
        delete [] pBuf;

        // srf contains the image in the HBITMAP
        srf.SaveImage(filePath,SI_NONE);

/*
        //Filter
        DWORD dwFilterID = FILTERID_BMP;//FILTERID_PNG, FILTERID_JPEG
        //Filter Manager
        LPRH rhPtr = rdPtr->rHo.hoAdRunHeader;
        CImageFilterMgr pMgr = rhPtr->rh4.rh4Mv->mvImgFilterMgr;
       
        ExportImage(pMgr, filePath, &srf, dwFilterID);
*/

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But now, a BMP image is created but it's not a valide one. Is the code above is correct (without using MMF2 filters) ? Maybe the bug is in my HBitmap now...

After you allocate bmpInfo...

Code:

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bmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

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You need to include ImageFlt.h before ImgFlt.h, as that contains the class definitions.

Thanks, ChrisB.
Now if I include ImageFlt.h and ImgFlt.h, no errors occurs on compilation... :)
...but when I save the image (ex hbitmap) a BMP file is created and can't be read (58 bytes, 0x0 bitmap file) like before... :(


If I uncomment the Export, I obtain this error :

Code:

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error C2065: 'FILTERID_BMP' : undeclared identifier

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Thanks again for help ;)