Convert base64string into image

Question

I m sending base64string from android app to webservice. webservice converts that base64string into image again. But i m getting below error from web service while converting base64string into image again:

"A generic error occurred in GDI+." this error i m getting on server only.

below is my code:

public string Base64ToImage(string base64String, string imgName)
{
    try
    {
        // Convert Base64 String to byte[]
        byte[] imageBytes = Convert.FromBase64String(base64String);
        MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);

        // Convert byte[] to Image
        ms.Write(imageBytes, 0, imageBytes.Length);
        System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);

        image.Save(
            "D:\\apps\\PJP_TEST\\PJPTest\\Online\\ImageStorage\\" + imgName);

        return "Success";
    }
    catch (Exception ex)
    {
        return ex.Message;
    }           
}

Why don't you write the conents of imageBytes to disk directly? — C.Evenhuis
– C.Evenhuis, Commented Sep 17, 2014 at 7:55
possible duplicate of A generic error occurred in GDI+. (Only if i try it on the server) — BLoB
– BLoB, Commented Sep 17, 2014 at 8:07

Patrick Hofman · Accepted Answer · 2014-09-17 07:55:47Z

4

I guess with 'server' you mean 'web server'. You probably have no rights to write in the folder D:\apps\PJP_TEST\PJPTest\Online\ImageStorage.

Check if the user that the application is running on has read and write access to the specified folder.

As said, it is easier to write the file directly:

File.WriteAllBytes( Path.Combine
                    ( @"D:\apps\PJP_TEST\PJPTest\Online\ImageStorage\"
                    , imgName
                    )
                  , imageBytes
                  );

answered Sep 17, 2014 at 7:55

Patrick Hofman

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6 Comments

AVee Over a year ago

You'd expect an IOException if that where the case, not a GDI+ error.

Patrick Hofman Over a year ago

@AVee: Too bad. It really is.

AVee Over a year ago

You're right, it indeed throws a System.Runtime.InteropServices.ExternalException. And yeah, I'd consider that pretty bad (but that doesn't make it less true).

Patrick Hofman Over a year ago

@AVee: It is really obscure, but this is the error message you get when a file can't be written. I guess there is some low level Windows stuff going on in that method.

AVee Over a year ago

That's exactly what I just did :)

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