c++windowsqtqprocess

QProcess prints output with some commands

I'm facing a weird problem with Qt5 and C++ on windows 10.

I have to run a QProcess and detect its output, but it prints only with some commands (actually just one):
with the ping command, it prints the output normally:

process->start("ping 8.8.8.8");
process->waitForFinished();
std::cout << process->readAllStandardOutput();

but with echo it doesn't print anything:

process->start("echo foo")

I tried changing the command (like dir) but it doesn't work; playing with (") or (') doesn't work either.

After some research I found that the command failed to start. Why is that?

Solution

  • I had to run the process with:

    cmd /c

    So the final result is:

    process->start("cmd /c \"echo foo\" ");