Re: Quick help on QProcess

[ufo-vl]

I think is valid:

out->append(process.readAllStandardOutput());

out->append(process.readAllStandardOutput());

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I'm try create simple application when using QProcess class,
but I didn't receive output buffer.

//main.cpp
#include <QApplication>
#include "dialogimpl.h"
//
int main(int argc, char ** argv)
{
	QApplication app( argc, argv );
	DialogImpl win;
	win.show(); 
	app.connect( &app, SIGNAL( lastWindowClosed() ), &app, SLOT( quit() ) );
	return app.exec();
}
 
///////////////////////////////////////////////////////////////////////////////////////////////////////
// dialogimpl.cpp
#include "dialogimpl.h"
#include <QProcess>
//
DialogImpl::DialogImpl( QWidget * parent, Qt::WFlags f) 
	: QDialog(parent, f)
{
	setupUi(this);
	process = new QProcess(this);
	process->setReadChannel(QProcess::StandardOutput);
	connect(process, SIGNAL(readyReadStandardOutput()), this, SLOT(output()));
	connect(pushButton, SIGNAL(clicked()), this, SLOT(runcmd()));
}
//
void DialogImpl::output()
{
	textEdit->append((process->readAllStandardOutput()));
}
//
void DialogImpl::runcmd()
{
	process->start(lineEdit->text());
}
 
///////////////////////////////////////////////////////////////////////////////////////////////////////
// dialogimpl.h
#ifndef DIALOGIMPL_H
#define DIALOGIMPL_H
//
#include "ui_dialog.h"
//
class QProcess;
 
class DialogImpl : public QDialog, public Ui::Dialog
{
Q_OBJECT
public:
	DialogImpl( QWidget * parent = 0, Qt::WFlags f = 0 );
private slots:
	void output();
	void runcmd();
private:
	QProcess* process;
};
#endif

//main.cpp
#include <QApplication>
#include "dialogimpl.h"
//
int main(int argc, char ** argv)
{
	QApplication app( argc, argv );
	DialogImpl win;
	win.show(); 
	app.connect( &app, SIGNAL( lastWindowClosed() ), &app, SLOT( quit() ) );
	return app.exec();
}

///////////////////////////////////////////////////////////////////////////////////////////////////////
// dialogimpl.cpp
#include "dialogimpl.h"
#include <QProcess>
//
DialogImpl::DialogImpl( QWidget * parent, Qt::WFlags f) 
	: QDialog(parent, f)
{
	setupUi(this);
	process = new QProcess(this);
	process->setReadChannel(QProcess::StandardOutput);
	connect(process, SIGNAL(readyReadStandardOutput()), this, SLOT(output()));
	connect(pushButton, SIGNAL(clicked()), this, SLOT(runcmd()));
}
//
void DialogImpl::output()
{
	textEdit->append((process->readAllStandardOutput()));
}
//
void DialogImpl::runcmd()
{
	process->start(lineEdit->text());
}

///////////////////////////////////////////////////////////////////////////////////////////////////////
// dialogimpl.h
#ifndef DIALOGIMPL_H
#define DIALOGIMPL_H
//
#include "ui_dialog.h"
//
class QProcess;

class DialogImpl : public QDialog, public Ui::Dialog
{
Q_OBJECT
public:
	DialogImpl( QWidget * parent = 0, Qt::WFlags f = 0 );
private slots:
	void output();
	void runcmd();
private:
	QProcess* process;
};
#endif

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Where I was mistaken?

[jacek]

What happens if you add:

connect( process, SIGNAL(started()), QCoreApplication::instance(), SLOT(aboutQt()) );

connect( process, SIGNAL(started()), QCoreApplication::instance(), SLOT(aboutQt()) );

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at the end of dialog's constructor?

[ufo-vl]

Strange situation,
if I run "calc.exe" (for example), it's working (calculator running) and About dialog was shown.
If I run "dir", it's not working, and About dialog was not shown.

[marcel]

But dir is not a real application. It is just built in command prompt.
On the other hand, calc is an application and can be a process.

If you want to use command scripting, then use batch files. Execute them like this:
"cmd.exe my_batchFile.bat"

Regards

[ufo-vl]

It is very a shame to me. I have absolutely forgotten it.:-(.
Many thanks

[ufo-vl]

And one question,
when started program,
CONSOLE dialog was shown. Can I to get rid of it?
I'm planned run console commands and taking output from console,
but I do not need to be shown the console thus.

[marcel]

No, I don't think you can do that.
You cannot run cmd without the window.

Regards

[ufo-vl]

It is a pity.
But the problem not only at use CMD, at start of the program (which uses QProcess) console dialog was shown :-(.

[ufo-vl]

The question is solved.
A problem in absence of a patch for hands )