[Qt-interest] newbie: application locks up

[john doe]

Hello all,
             Still relative newbie with Qt. I have made my first form
containing combo buttons, lineedits and whatnot :-). I am facing a problem
though regarding calling an external program from within the C++ Qt code.

I have a ubuntu system and want to invoke a shell script which does some
string manipulations on a large file. I used system() within the C++ code to
do it and it runs. The problem is that when I press a button to start the
external program, if it takes 10 minutes to finish, the button seems to be
depressed for this duraion. Basically, like waiting for the program to
finish. How can I make the button not be depressed for this complete
duration so that I can possibly start another instance of the external
program by pressing a button on the main form.

I am not an expert programmer, but I think this smells of asynchronous
calls..right? Any insight would be greatly appreciated :-).

I did try using a & at the end of the external program I am invoking but
that does not help. Nothing runs. I am using kdesudo to start the external
program as it requires certain privileges.

Also I tried to use a progress bar with minimum and max set to 0 to
continuosly work while the external program is running and it does not seem
to work. Any pointers to threads/articles?

Thanks in  advance.
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