How to call others programs?

Hello everybody,

I have found a method to call others programs in my controller with a
pipe, like this :

pipe=IO.popen “my command”,“r”

But for some obscur reasons, now that I have install the plugin
backgroundrb to launch tasks in background, this method doesn’t work

Did someone know why ??

Or did someone know an other method that works to call my programs ( in
C and C++ ) and to get the output of those programs ??

Thank’s in advance !