Convert an image to base64 and vice versa

Question

I want to convert an image to base64 and back to image again. Here is the code which i tried so far and the error also. Any suggestions please?

public void Ba         


        

Answer 1

The MemoryStream.Read Method reads bytes from the MemoryStream into the specified byte array.

If you want to write the byte array to the MemoryStream, use the MemoryStream.Write Method:

ms.Write(imageBytes, 0, imageBytes.Length);
ms.Seek(0, SeekOrigin.Begin);

Alternatively, you can simply wrap the byte array in a MemoryStream:

MemoryStream ms = new MemoryStream(imageBytes);

Answer 2

You are reading from an empty stream, rather than loading the existing data (imageBytes) into the stream. Try:

byte[] imageBytes = Convert.FromBase64String(coded);
using(var ms = new MemoryStream(imageBytes)) {
    finalImage = System.Drawing.Image.FromStream(ms);
}

Also, you should endeavour to ensure that finalImage is disposed; I would propose:

System.Drawing.Image finalImage = null;
try {
    // the existing code that may (or may not) successfully create an image
    // and assign to finalImage
} finally {
    if(finalImage != null) finalImage.Dispose();
}

And finally, note that System.Drawing is not supported on ASP.NET; YMMV.

Caution

Classes within the System.Drawing namespace are not supported for use within a Windows or ASP.NET service. Attempting to use these classes from within one of these application types may produce unexpected problems, such as diminished service performance and run-time exceptions. For a supported alternative, see Windows Imaging Components.