Shoutbox

I've been trying for a while now to use DynImage to convert image formats to png and I cannot manage to do it, the image allways comes out just plain old white.

Could someone please supply some sample code for jpg to png.

Thanks,
David.

It can't be done with DynImage IIRC... It needs a seperate DLL or you could use some windows APIs... Check out my ChangeMe! script thats on the forum somewhere as I think it also included the second DLL for file conversion

Thanks man. If I manage to do it, I'll post the code

Anyway, heres the url for your script: http://shoutbox.menthix.net/showthread.php?tid=68694&page=1

EDIT: Only works for bmp conversion

Welcome to the wonderful world of Gdip

code:

---

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;
}

---

matty, you are one seriously extreme coder XD

Thanks once again, keep up the good work

One more thing, would it be possible for me to easily check the file format of an image besides using lastIndexOf etc.

There is yes,

I don't however have a way of testing it currently so I cannot provide you with code to use it (I am at work). However when I get home I will do it unless someone else does already.