Image.Save method yields no result

Question

My aim is to convert a base64 string into an image and save it to the disk. I have the following code (mostly from this SO answer) -

namespace ImageSaver
{
    using System;
    static class Program
    {
        public static void LoadImage()
        {
            //get a temp image from bytes, instead of loading from disk
            //data:image/gif;base64,
            //this image is a single pixel (black)
            byte[] bytes = Convert.FromBase64String("R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==");

            Image image;
            Bitmap bimage;
            using (MemoryStream ms = new MemoryStream(bytes))
            {
                image = Image.FromStream(ms);
            }
                bimage = new Bitmap(image);
                bimage.Save("c:\\img.gif", System.Drawing.Imaging.ImageFormat.Gif);
        }
        static void Main(string[] args)
        {
            ImageSaver.Program.LoadImage();
        }
    }
}

I ran it on MS Visual Studio 2010 Ultimate (Windows 8.1 Pro x64), without errors, but I could not find the image file in C drive. Where did I go wrong?

add this after calling `LoadImage` and see the result. `Console.WriteLine(File.Exists("c:\\img.gif"));` — Hamid Pourjam, Jun 24 '15 at 10:20
What happens if you use a different path that you definitely have unrestricted write access to (e.g. your documents folder)? — Damien_The_Unbeliever, Jun 24 '15 at 10:25
@Damien_The_Unbeliever, if the code does not have access to the path then it will throw an exception — Hamid Pourjam, Jun 24 '15 at 10:26
@dotctor - I'm more thinking about the various redirection bits that are part of UAC - where access to some paths "succeeds" but ends up writing to completely different locations. — Damien_The_Unbeliever, Jun 24 '15 at 10:27
Perhaps place a try/catch round the save and see if anything pops up there. — Jeb, Jun 24 '15 at 10:29
have you considered having the correct permissions to write? — Harry, Jun 24 '15 at 10:31
what do you mean by does not work? any error? are you running this code? are you refreshing the folder to see the changes? — Hamid Pourjam, Jun 24 '15 at 10:31
try debugging the code, put a break point on `LoadImage` function and see whether it is called or not. — Hamid Pourjam, Jun 24 '15 at 10:34
@dotctor I am running the code and repeatedly refreshing the folder to see the change. Also, `LoadImage` is being called alright. — nsane, Jun 24 '15 at 10:35
try calling `bimage.Dispose()` after calling `bimage.Save(...)` — Hamid Pourjam, Jun 24 '15 at 10:42
I believe it to be some kind of issue with write permissions. It works for folders inside the drive. — nsane, Jun 24 '15 at 10:57
It did give a `A generic error occurred in GDI+` exception when tried on locations with restricted write access. — nsane, Jun 24 '15 at 11:08

Galma88 · Answer 1 · 2015-06-24T10:47:25.770

1

Try to save your file in this way:

File.WriteAllBytes(@"c:\img.gif", bytes);

EDIT

Anyway put your code under try'n'catch to better understand why you file is not being saved.

edited Jun 24 '15 at 10:47

answered Jun 24 '15 at 10:36

Galma88

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The OP's code apparently "ran without problems", so there are no exceptions to inspect. – Hans Keﬆing Jun 24 '15 at 11:00

score 1 · Answer 2 · answered Jun 24 '15 at 10:59

Try updating LoadImage to this to find out what the error is, and set a debug point on the MessageBox to examine the full details of what's happening;

public static void LoadImage()
    {
        try
        {
            //get a temp image from bytes, instead of loading from disk
            //data:image/gif;base64,
            //this image is a single pixel (black)
            byte[] bytes = Convert.FromBase64String("R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==");

            Image image;
            Bitmap bimage;
            using (MemoryStream ms = new MemoryStream(bytes))
            {
                image = Image.FromStream(ms);
            }
            bimage = new Bitmap(image);
            bimage.Save("c:\\img.gif", System.Drawing.Imaging.ImageFormat.Gif);

        }
        catch (Exception ex) {
            MessageBox.Show(ex.Message);
        }
    }

Image.Save method yields no result

2 Answers2