QProcess not working.
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@KroMignon , I've tried this:
QString strApp(DataSets::mscszMariaDBdumpApp); QStringList slstArguments; slstArguments << ("\"" + strDBinstFolder + strApp + "\"") << (QString(DataSets::mscszOptionHost) + Trainer::strHost()) << (QString(DataSets::mscszOptionUser) + Trainer::strUser()) << (QString(DataSets::mscszOptionPassword) + Trainer::strPassword()) << (Trainer::strDatabase()) << QString(">") << strFilename; pobjProcess->setWorkingDirectory(strDBinstFolder); pobjProcess->start(strApp, slstArguments); QObject::connect(pobjProcess, &QProcess::errorOccurred, [this](QProcess::ProcessError err) { qDebug() << "Error: " << err; }); QObject::connect(pobjProcess, &QProcess::stateChanged, [pobjProcess](QProcess::ProcessState newState) { const qint64 cint64PID(pobjProcess->processId()); if ( newState == QProcess::NotRunning ) { } else if ( newState == QProcess::Running && cint64PID > 0 ) { } qDebug() << "PID: " << cint64PID << ", newState: " << newState; });@SPlatten This don't make sense to me:
- Why do you add application into argument list?
- Why to you redirect it to a file and not directly read it for QProcess stream?
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@SPlatten Did you notice "EDIT: do NOT add redirection in slstArguments !!!" in @KroMignon post?
Why do you need redirection to a file if you can simply read the stdout from the process as @KroMignon already suggested? -
@jsulm The purpose of this is to provide an export / backup facility of the database to an SQL file.
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@SPlatten This don't make sense to me:
- Why do you add application into argument list?
- Why to you redirect it to a file and not directly read it for QProcess stream?
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@KroMignon , as I said earlier I've tried numerous things, thats just one of variant.
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@SPlatten
int QProcess::execute(const QString &program, const QStringList &arguments) [static]. So it'sexecute. It was introduced into some Qt. I don't know about 5.9.2.As I said, forget I ever wrote
execorexecute. The same argument processing applies toQProcess::start. You keep passing>argument, and I've explained this won't work.@JonB , just tried:
QProcess::execute(strApp);strApp contains:
/c "C:/Program Files (x86)/MariaDB 10.5/bin/mysqldump" --host=localhost --user=trainer --password=CobhamAC training > C:/Users/simon.platten/Documents/TrainerS1D5.sqlStill not working.
Kind Regards,
Sy -
@SPlatten said in QProcess not working.:
I don't follow you, if I copy the command line and arguments to a command prompt it works, the arguments are everything it needs for mysqldump to connect and export the database.
With QProcess, you don't start the process from a shell / command prompt, that is the difference here.
Try this:auto proc = new QProcess; QObject::connect(proc, &QProcess::stateChanged, [proc](QProcess::ProcessState newState) { qDebug() << "new state is " << newState; if(newState == QProcess::NotRunning) { QString output(proc->readAll()); qDebug() << "Output is" << output; proc->delateLater(); } }); proc->setWorkingDirectory(strDBinstFolder); proc->start(strApp,slstArguments );EDIT: do NOT add redirection in slstArguments !!!
EDIT BIS:
QStringList slstArguments; slstArguments << (QString(DataSets::mscszOptionHost) + Trainer::strHost()) << (QString(DataSets::mscszOptionUser) + Trainer::strUser()) << (QString(DataSets::mscszOptionPassword) + Trainer::strPassword()) << (Trainer::strDatabase());==> I suppose that DataSets::mscszOptionHost contains
--host=@KroMignon , yes it does, I'll try without the application which is where I started.
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@JonB , just tried:
QProcess::execute(strApp);strApp contains:
/c "C:/Program Files (x86)/MariaDB 10.5/bin/mysqldump" --host=localhost --user=trainer --password=CobhamAC training > C:/Users/simon.platten/Documents/TrainerS1D5.sqlStill not working.
@SPlatten said in QProcess not working.:
QProcess::execute(strApp);
First parameter is the executable ("cmd.exe" in your case), second is a list of parameters...
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@JonB , just tried:
QProcess::execute(strApp);strApp contains:
/c "C:/Program Files (x86)/MariaDB 10.5/bin/mysqldump" --host=localhost --user=trainer --password=CobhamAC training > C:/Users/simon.platten/Documents/TrainerS1D5.sqlStill not working.
@SPlatten
No, that is not what I said at all. Look at the example. The program needs to becmd.exe. The arguments need to be first/cand second your whole command line (as a single argument; forcmdit doesn't seem to matter if you pass it as one string as I showed, or I think it will accept each argument separately). I showed you earlier an example of what you need. -
@SPlatten
No, that is not what I said at all. Look at the example. The program needs to becmd.exe. The arguments need to be first/cand second your whole command line (as a single argument; forcmdit doesn't seem to matter if you pass it as one string as I showed, or I think it will accept each argument separately). I showed you earlier an example of what you need. -
@SPlatten
Having said that. If the only purpose of having to go viacmd /cis to handle the redirection of output via>, I would handle that back inQProcess(I think others have suggested this) and then you won't need to go viacmd, which has its disadvantages. -
@SPlatten
Having said that. If the only purpose of having to go viacmd /cis to handle the redirection of output via>, I would handle that back inQProcess(I think others have suggested this) and then you won't need to go viacmd, which has its disadvantages.
