How to wait child process with QProcess?

Question

I am try to wait child process with this code:

auto child = new QProcess;
child->start("cmd.exe");
child->waitForFinished();

But cmd.exe doesn't open and the main program runs. What is the error?

And how I should wait correctly? waitForFinished waits 30000 msecs by default. What if I want to wait infinitely?

Answer 1

I suggest checking the return value to see if the program is started successfully using the waitForStarted ( doc ) and try to use the full path of CMD: "C:/windows/system32/cmd.exe" .

Also, check online, the question is already been asked here .

To wait infinitely you need to call waitForFinished with -1 ( doc ):

child->waitForFinished(-1);