How to get file encoding type

Hi ,
How to get the file encoding type,
for example file is saved with the .txt and encoding is utf-8 and another file is saved .txt with encoding is ascii,
actually before reading the file i want idetify the encoding type
please help me it is very urgent for me..
thanks in advance

As there is no established regime for signing most encoding types, the only way to do this is to start parsing the file in one encoding, see if you get something that makes sense, and if not try another encoding, and so on. I.e. you have to code it yourself and even then it is not usually reliable. Sorry.
Drake

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