Restart app does not work

guidupas

Hello!

I am trying to restart my app using the code:
@
QStringList args = QApplication::arguments();
args.removeFirst();
QProcess::startDetached(QApplication::applicationFilePath(), args);
QCoreApplication::quit();
@

or

@
QProcess::startDetached(qApp->arguments()[0], qApp->arguments());
qApp->quit();
@

It works fine when I run it in Qt, but when I build it, generate the .pkg and install it does not restart and when I reopen the app it gives a message that the app was finished during windows reopen.

I am using OSX 10.9

Thanks very much.

SGaist

Hi,

You should rather use the QCoreApplication::applicationFilePath method to retrieve the executable's location. qApp->arguments()[0] might not contain what you think, especially on 10.9

Hope it helps

guidupas

Well, I tried this and still not working

@
QProcess::startDetached(QCoreApplication::applicationFilePath());
qApp->quit();
@

Not even when I run in Qt

SGaist

Did you check what value both calls return ?

guidupas

Well, when I run
@
qDebug() << QApplication::applicationFilePath();
@

It returns:
@
"/Users/guilhermedupas/Dropbox/Guilherme - Particular/QT/Projetos/build-SwotGut-Desktop_Qt_5_3_0_clang_64bit-Release/SwotGut.app/Contents/MacOS/SwotGut"
@

This is the correct location of the executable

SGaist

For the sake of testing, try starting it normally with QProcess and check what error you might get

guidupas

Can you help me how to do that? How can I see the returned error?

Thanks a lot.

SGaist

Just follow the example from "here":http://qt-project.org/doc/qt-5/qprocess.html#synchronous-process-api and check what you have in both output channels

guidupas

SGaist, I did the process like the example:
@
QObject *parent;
QString program = "/Users/guilhermedupas/Dropbox/Guilherme - Particular/QT/Projetos/build-SwotGut-Desktop_Qt_5_3_0_clang_64bit-Release/SwotGut.app/Contents/MacOS/SwotGut";

QStringList arguments;
arguments << "-style" << "fusion";

QProcess *myProcess = new QProcess(parent);
myProcess->start(program, arguments);

if (!myProcess->waitForStarted())
        qDebug() << "false";

if (!myProcess->waitForFinished())
        qDebug() << "false";

QString result = myProcess->readAll();

qDebug() << result;

@

My program runs, but when I click in the action to restart that uses this code:
@
QProcess::startDetached(QCoreApplication::applicationFilePath());
QCoreApplication::quit();
@

Console returns this: ""
And I need to use control c to exit and in Qt output appears crashed

SGaist

IIRC, since you didn't merge both channels, you need to call read readAllStandardError and readAllStandardOutput to check what happened