IO redirect: cout not working in main

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I have a function in which standard output is redirected to a pipe.

I call the function from main, before calling the function, "cout" works fine. After the function, cout<< doesn't output anything, nor does write(1,"",..). But cerr could still output to console.

I think are those IO redirect in the function make cout not work in main.

Is there anyway I could use cout in main ,after the function, to out put to the screen? What's the difference between cout and cerr?

THANKS!

asked 30 secs ago

fuiiii

107