problem about kill a QProcess

hi guys!
I have started a QProcess object.then i want to kill the QProcess,but,to my suprise,it can't kill the QProcess.my codes are:QProcess myProcess;
myProcess.start("/usr/local/bin/drcomd"); /* the drcomd can be replaced by any other command*/
and few times later,i use "myProcess.kill();"to kill myProcess.but failed.because if i use "ps -e" in the console,i can see the drcomd yet.if i have to get myProcess's pid using myProcess.pid()?

try terminate()

Terminate sends SIGTERM, whereas kill sends SIGKILL.
SIGTERM requests an application to die, but the application can ignore it.
SIGKILL kills the application without a request.

You should use Terminate first, and if the application doesn't respond within a timely manner, use Kill