Qprocess for a prompted program

[ChrisW67]

The last message suggests that your QProcess object is either going out of scope after being allocated on the stack, or being deliberately deleted after being allocated on the heap but before it has finished cleanly. I'd start by looking at the conditions that might destroy the QProcess object.

[brezel]

for the search engines...i had the same problem trying to execute gnuplot and writing commands to the QProcess. turns out what i was missing was newlines at the end of each command

commands << "set datafile commentschars \";\"\n"
            << "set terminal png\n"
            << QString("set output \"").append(outfile).append("\"\n")
            << "set multiplot layout 2,1\n"
...
 
            gnuplot.start("gnuplot", QIODevice::ReadWrite);
            foreach (QString cmd , commands) {
                gnuplot.write(cmd.toUtf8());
            }
            gnuplot.waitForFinished();

commands << "set datafile commentschars \";\"\n"
            << "set terminal png\n"
            << QString("set output \"").append(outfile).append("\"\n")
            << "set multiplot layout 2,1\n"
...

            gnuplot.start("gnuplot", QIODevice::ReadWrite);
            foreach (QString cmd , commands) {
                gnuplot.write(cmd.toUtf8());
            }
            gnuplot.waitForFinished();

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this code worked for me