Popen - How can I read data before CTRL+C command is issued

[maffaz]

You can can try reading from self.proc.stdout till you get your device in the output - and then kill the process.

for line in self.proc.stdout:
    if <> in line:
        self.proc.kill()

(I think).

The problem is - it may get stuck. And what happens if the device never shows up?

I used to write stdout to a file stdout=open(<log name>, 'w') - and then periodically look-up the file content in a loop, and leaving the loop after some maximum number of attempts.

I tried that but I cannot actually read the stream in the first place.

I also tried saving to a file.

In both cases, It will save to a file/list no problem but only AFTER the CTRL+C command is pressed.

kill etc does not allow save anything!

I can only capture the data after the CTRL+C is issued. Before that I get nothing.

It is buffered data and seems to be in memory until CTRL+C and then it spits out what is there!

---

can you do it if a variable?
ctrlc = chr(5)
then issue ctrlc?

Yes, it is also possible but This is not the issue.

I need to read the data and save to a variable before the CTRL+C command is issued