QProcess can read stderr but no stdout

[mastupristi]

I haven't looked at all your code but are you sure that

printf("o %d\n", o);

printf("o %d\n", o);

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prints to stdout and not the current console/shell/...?

of course
anyway try to change that line to:

fprintf(stdout,"o %d\n", o);

fprintf(stdout,"o %d\n", o);

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thanks