current Cpu(s) usage info

How can i get this info ? or how can i get this via KProcess and top command, because

Code:

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KProcess p;
p->setProgram( "top", QStringList() );
p->start();

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and readAllStandardOutput() doesn't work.

The process works in an asynchronous way. You can start it and immediately read the result - it's not there. Connect to a proper signal instead.

i konw that. I have error "top: failed tty get" . Any idea?

Apparently it needs a real terminal. Try using uptime instead of top or parse /proc/stat yourself.