[Qt-interest] qprocess related with qprogressbar

[mierdatutis mi]

Many thanks Sean!!

I try with this code but the compiler gives me an error:

"Program received signal SIGSERV. Segmentation fault"

 #include <QMainWindow>

#include "ui_mainwindow.h"

//

class MainWindowImpl : public QMainWindow, public Ui::MainWindow

{

Q_OBJECT

public:

MainWindowImpl( QWidget * parent = 0, Qt::WFlags f = 0 );

private slots:

void cambio(QListWidgetItem*);

void salida();

public slots:

void doSomething();

private:

QProcess *proc2;

 };


 #include "mainwindowimpl.h"

#include "mainwindowimpl.h"

#include <QProcess>

#include <QtGui>

#include <QApplication>

#include <QFile>

#include <QTextStream>

#include <QTextEdit>

#include <QListWidgetItem>

#include <QTextBrowser>

#include <QFileInfoList>

#include <iostream>

#include <QThread>

#include <QString>

#include <stdio.h>

#include <QProgressDialog>

#include <QFileDialog>

#include <QImage>

#include <QByteArray>

 MainWindowImpl::MainWindowImpl( QWidget * parent, Qt::WFlags f)

: QMainWindow(parent, f)

{

setupUi(this);

QDir dir;

//showFullScreen();

QProcess *proc2 = new QProcess();

QStringList strs;

QString directorio = "/home/david/COMPLETADAS/PELIS";

QDir listado(directorio);

listado.setFilter(QDir::Dirs | QDir::Hidden | QDir::NoSymLinks);

listado.setSorting(QDir::Size | QDir::Reversed);

QFileInfoList list = listado.entryInfoList();

for (int i = 0; i < list.size(); ++i) {

 QFileInfo fileInfo = list.at(i);

lista->insertItem(i,fileInfo.fileName());

 }

 connect(proc2, SIGNAL(readyReadStandardOutput()),this, SLOT(salida()));

connect(lista, SIGNAL( itemClicked(QListWidgetItem*) ), this,
SLOT(cambio(QListWidgetItem*) ) );

}

  void MainWindowImpl::cambio(QListWidgetItem * item )

{

doSomething();

}

void MainWindowImpl::doSomething()

{

QString str=lista->currentItem()->text();

qDebug() << lista->currentItem()->text();

 proc2->start("/home/david/seguridad/verdadero/sino.sh",QStringList() << str
);

}

void MainWindowImpl::salida()

{

//QProcess *proc2 = new QProcess();

QStringList strs;

 QByteArray result=proc2->readAllStandardOutput();

qDebug() << proc2->readAllStandardOutput();

 QStringList lines = QString(result).split("\n");

foreach (QString line, lines) {

texto->append(line);

   }

}



Could you help me please? I search in google but I don't find nothing :-(

Many thanks and sorry for my english!!



2009/6/26 Sean Harmer <sean.harmer at maps-technology.com>

> Hi,
>
> mierdatutis mi wrote:
> > Many thanks to all.
> >
> > I will try to capture the stdout of the shell script and parse it in
> > order to update the progress bar.
> >
> > I see that for I capture the stdout I have to use the signal
> > "readyReadStandardOutput"
> >
> >
> > I declare a Qprocess in the funciton MainWindow but when I try to
> > compile it gives me an error when I do:
> >
> > proc2->start("/home/david/seguridad/verdadero/pruebon.sh",
> > QStringList() << strs );
> >
> >
> > in other function that it's a slot of a ListWidget Signal. The
> > compiler says me:
> >
> > src/mawindindowimpl.cpp:87:error: 'proc2' not declared in this scope
> >
> >
> > I must declare : QProcess *proc2 = new QProcess(); in all functions???
> >
> > Many thanks and sorry for my english!
> >
> No, we are no venturing into basic c++ land and not related directly to
> Qt. You need to declare your QProcess object in your class declaration.
> I would then instantiate it in the constructor of your class and then
> use it in a member function of that class. For e.g.
>
> In your .h file
>
> class QProcess;
>
> class MainWindow : public QMainWindow
> {
> Q_OBJECT
> public:
>    MainWindow( QWidget* parent = 0 );
>    ~MainWindow();
>
> public slots:
>    void doSomething();
>
> protected slots:
>    void processStarted();
>    void updateProgress();
>
> private:
>    QProcess* m_proc;
> };
>
> Then in your .cpp file
>
> MainWindow::MainWindow( QWidget* parent )
> : QMainWindow( parent ),
>  m_proc( 0 )
> {
>    m_proc = new QProcess( this );
>    connect( m_proc, SIGNAL( started() ), SLOT( processStarted() ) );
>    connect( m_proc, SIGNAL( readyReadStandardOut() ), SLOT(
> updateProgress() ) );
> }
>
> MainWindow::~MainWindow
> {
>    // No need to delete m_proc as Qt object model does this for us
> }
>
> void MainWindow::doSomething()
> {
>    // set up arguments
>    ...
>    m_proc->start("/home/david/seguridad/verdadero/pruebon.sh",
> QStringList() << strs );
> }
>
> void MainWindow::processStarted()
> {
>    // When this gets called the process has started
>    qDebug() << "Process started successfully";
> }
>
> void MainWindow::updateStatus()
> {
>    // Get output from process
>    QByteArray output = m_proc->readAllStandardOut();
>
>    // Parse it as needed
>    int percent;
>    ...
>
>    // Update progress bar
>    m_progress->setValue( percent );
> }
>
> That should give you an idea of what to do.
>
> HTH,
>
> Sean
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> Qt-interest at trolltech.com
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>
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