Read File Headers

[Mark A Nelson]

How Determining the type of file through header info. I want to be able to read a files header and say thats a jpg, gif, png etc... Even if the file name is something else then name.jpg or name.gif

[Michael Mattias]

Marco Pontello's "TrID" product described in this current thread?

http://www.powerbasic.com/support/pbforums/showthread.php?t=36962

[Hubert Brandel]

Hi,

you can open a file in binary read only and read the bytes you need.
Here you can find a lot of file format definitions:

http://www.wotsit.org/

[Mark A Nelson]

How would I read the file in to do the match?

[Hubert Brandel]

do you want to know how to open a file binery ?

nH = freefile
open cFilename FOR binary ACCESS read AS #nH
GET$ # nH, 100,cString
close # nH

now you have the first 100 Bytes in cString. Maybe you need less or more, but you have to get the info (spec.) about every needed fileheader to compare with cString.