Shoutbox

Welcome to the wonderful world of Gdip

code:

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var sGpStatus = new Array('[Ok]', '[GenericError]', '[InvalidParameter]', '[OutOfMemory]', '[ObjectBusy]', '[InsufficientBuffer]', '[NotImplemented]', '[Win32Error]', '[WrongState]', '[Aborted]', '[FileNotFound]', '[ValueOverflow ]', '[AccessDenied]', '[UnknownImageFormat]', '[FontFamilyNotFound]', '[FontStyleNotFound]', '[NotTrueTypeFont]', '[UnsupportedGdiplusVersion]', '[GdiplusNotInitialized]', '[PropertyNotFound]', '[PropertyNotSupported]');

function OnEvent_Initialize(MessengerStart){
    GdipConvertImage('c:\\myimage.jpg', 'c:\\myimage.png');
}

/*
    Name:    GdipConvertImage
    Purpose:     Converts an image of any format to PNG
    Parameters:    sImgIn - The path to the original image
            sImgOut - The path to the file to output
    Return:    True if function succeeds / False if it fails
*/

function GdipConvertImage (sImgIn /* InputFile */, sImgOut /* Output File */) {
    var ret;
    var GdipToken = Interop.Allocate(4);
    var nImgPtr = Interop.Allocate(4);
    var GdipStartupInput = Interop.Allocate(16);
        GdipStartupInput.WriteDWORD(0, 1);
   
    Interop.Call('gdiplus', 'GdiplusStartup', GdipToken, GdipStartupInput, 0);
    if (GdipToken.ReadDWORD(0) !== 0 /* Loaded Properly */) {
        Interop.Call('gdiplus', 'GdipLoadImageFromFile', sImgIn, nImgPtr);
        if (nImgPtr.ReadDWORD(0) !== 0 /* Check to see if the image was loaded by Gdip */) {
            var ImageFormat = Interop.Allocate(16);
            Interop.Call('ole32', 'CLSIDFromString', '{557CF406-1A04-11D3-9A73-0000F81EF32E}', ImageFormat);
            var EncoderParameters = Interop.Allocate(32);
            with (EncoderParameters){
                WriteDWORD (0, 1);
                WriteDWORD (20, 1);
                WriteDWORD (24, 4);
            }
            Interop.Call('ole32', 'CLSIDFromString', '{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}', EncoderParameters.DataPtr+4);
            ret = Interop.Call('gdiplus', 'GdipSaveImageToFile', nImgPtr.ReadDWORD(0), sImgOut, ImageFormat, EncoderParameters);
            Debug.Trace('Convert of '+sImgIn+' to '+sImgOut+(ret === 0 ? ' successful.' : ' failed! (Error Code : '+sGpStatus[ret]+')'));
            Interop.Call('gdiplus', 'GdipDisposeImage', nImgPtr.ReadDWORD(0));
        }
    }   
    Interop.Call('gdiplus', 'GdiplusShutdown', GdipToken.ReadDWORD(0));
    return ret === 0;
}

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