Determine image type from Base64 string

Ginger · 27-03-2008 01:18PM #1

Hi

I have an XML file that will contain images in Base64 encoded format. I am currently able to reconstruct them as images fine, but i am only testing with JPGs at the moment. Further down the road there will be different types such as PNG and GIF

Is there a way to asses what type of image from the string as in is there a control set that tells you what it is?

What I am doing is converting InfoPath 2007 forms to XHTML using the XML and XSL file contained within the XSN file. The XML file contains the image encoded as a Base64 string

Ta

Martyr · 27-03-2008 01:23PM

could you decode a few bytes of the base64 encoded image and check the header for PNG/JPEG or GIF ???

the first few bytes are usually header.

Ginger · 27-03-2008 01:33PM

Its loaded into a byte array before writing so I am sure I can..

I am looking to see if its possible before investing some time into it

ressem · 27-03-2008 01:34PM

The info here might help to recognise what you're looking for.

http://www.mikekunz.com/image_file_header.html

Ginger · 27-03-2008 01:37PM

I will have a whack at it and see what happens

Ginger · 27-03-2008 01:44PM

ressem .. thanks for that infomation.. does exactly what I want..

Again thanks muchly

Determine image type from Base64 string

Comments