doubt in Qprocess.waitforfinished

[jefftee]

QProcess::waitForFinished should return false when the QProcess ends with an error *or* the number of milliseconds is reached. It should return true only when the process is finished before the number of milliseconds are reached *and* the QProcess ended normal (return code 0).

What is the return value from QProcess::waitForFinished and what is the QProcess::exitCode and QProcess::exitStatus? I don't believe you can do what you want by inspecting only the return value from QProcess::waitForFinished.

IMHO, if you're going to use the QProcess::waitForFinished method, you should probably make sure your process has started by using QProcess::waitForStarted as well.

[yeye_olive]

QProcess::waitForFinished should return false when the QProcess ends with an error *or* the number of milliseconds is reached. It should return true only when the process is finished before the number of milliseconds are reached *and* the QProcess ended normal (return code 0).

Really? The documentation is highly ambiguous:

Returns true if the process finished; otherwise returns false (if the operation timed out, if an error occurred, or if this QProcess is already finished).

I do not know what to make of this "an error occurred" condition. You seem to interpret an exit with code != 0 as such an error. From a quick look at the implementation, I believe, by contrast, that these errors are limited to internal errors (e.g. the underlying call to select() or the equivalent primitive fails).

EDIT:
I tested it on Linux and can confirm that waitForFinished() returns true when the process exits with a nonzero code.

[jefftee]

yeye_olive, you may be correct. I've never used the waitFor* methods as I stated in my post. Agree that the doc isn't as clear as it could be, but regardless of which view is correct, the OP needs to better describe what's occurring because I surely could not tell.