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Converting a Base64 String to an image

Fri May 27 2005

Do you ever get an email that has some base64 gobbledegook in it? A lot of times, based on MIME information directly preceding this junk, it's actually an image that got converted to text but never converted back to an image (duh, right? Tell me something I don't know? Okay...)

I got one of these earlier and decided to write a little utility to convert that string back into an image using the .net framework. It was pretty simple once I got the namespaces right:

using System;
using System.Drawing;
using System.IO;
using System.Collections;

public class MyClass
{
	public static void Main()
	{
		string base64 = @"R0lGODlhSwDRAPYAAG9qb6mlqJwdJMzHy5qYm722vbS2zldTWKzK9smjabKPZfLVnL26vo
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		j7Y5g/hx4auv8xprkEEmoEquZUStpkAxRrrYGSjRoNYQMbbFXphtllbc1gFWyBAAA7";

		Bitmap map;
		
		using(MemoryStream stream = new MemoryStream(Convert.FromBase64String(base64)))
		using(FileStream fs = File.Create(@"C:\tmp\img.gif")){
		
			map = (Bitmap)Image.FromStream(stream);
				
			map.Save(fs, System.Drawing.Imaging.ImageFormat.Gif);
		}
		
		WL("Converted Image Successfully!");
	}
	
	private static void WL(string text, params object[] args)
	{
		Console.WriteLine(text, args);	
	}
	
	private static void RL()
	{
		Console.ReadLine();	
	}
	
	private static void Break() 
	{
		System.Diagnostics.Debugger.Break();
	}
}

Slap that little snippet into Snippet Compiler and look at what is generated. I actually changed the image to something a little bit friendlier than the image I recieved in the email. Enjoy!

💾 May the source be with you. v3.2.1130