QProcess output with adb always empty - qt

Question

I am starting a QProcess to get e.g. the return of "adb devices".
There is no error and always an empty response. I have adb in my system env on Windows and the command runs fine on cmd.
Am I doing anythin wrong or is there another way to run adb commands in QT?
class ADBInfo: public QObject {
public:
void start(){
process = new QProcess( this );
process->start("adb.exe devices");
process->waitForFinished(-1);
qDebug() << "output: " << process->readAll();
qDebug() << "error: " << process->readAllStandardError();
}
private:
QProcess *process;
};

Answer 1

here is the correct way
QString mainwindow::cmd(const QString &command)
{
qDebug () << "command = "+command;
QProcess P2;
P2.start(command);
P2.waitForFinished(-1);
P2.setReadChannel(QProcess::StandardOutput);
QTextStream reade2(&P2);
QString line2,line,Out;
while (reade2.readLineInto(&line2))
Out.append(line2 +'\n');
P2.setReadChannel(QProcess::StandardError);
QTextStream reader(&P2);
while (reader.readLineInto(&line))
Out.append(line +'\n');
P2.close();
return Out.trimmed();
}
when you need to excute command
QString Result = cmd("adb devices")