Programming

I want to write a c-program which reads a textfile from a tar.gz archive.
How can I do it?

Use GNU tar and extract the file to stdout

Code:

tar -zxvOf filename.tar.gz somepath/yourfile.txt

The '-O' option tells tar to extract it to stdout.

If your using KDE there's one built-in, its called Archiver.

That's not what I wanted to now. My question was, if there is a function in c which allows to read a textfile from a tar.gz archive and put it in a variable.

yes, there are a number of functions to use to call an outside program. you can use exec() to call GNU tar. i think i understand what you want to do, youd like to actually write the code to uncompress the archive your self, while yes you can do that, it is (arguably) a large amount of work that you dont have to do, you already have tar. if you really want to write your own archiver/decompressor you could always look at the source of gnu tar to start you off.

let me add though, that if you just want to let a user pick an archive and read the text file inside of it from within your program then all you need to do is call tar from exec().

Hi,
i have tried to do it.....but....the system tell me that -x is invalidate option.....i wish to uncompress a file.....Do you have any suggestion or idea please?....
Thanks in advance,
Mary

Tried to do what? Run the line of code listed above, in the second post? Which system / shell are you running on?