How To Redirect The Console Output To A Text Browser/pop Up

[deekayt]

The code now looks like

QStringList s2;
			s2 << "-steg" << "coded.txt" << "-q" << ui.compressionspinBox->text() << "cleanimage.ppm" << ui.jpeglineEdit ->text() ;
		 	//QProcess *_proc;
			_proc = new QProcess( this );
			_proc->setReadChannelMode( QProcess::MergedChannels );
 
	 		connect( _proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( read()));
			connect( _proc, SIGNAL( started() ), QApplication::instance(), SLOT( aboutQt() ) ); 
 
			// connect( _proc, SIGNAL( finished(int, QProcess::ExitStatus) ), QCoreApplication::instance(), SLOT( quit() ) );
			 _proc->start(("cjpeg"),s2);
 
			//read();

QStringList s2;
			s2 << "-steg" << "coded.txt" << "-q" << ui.compressionspinBox->text() << "cleanimage.ppm" << ui.jpeglineEdit ->text() ;
		 	//QProcess *_proc;
			_proc = new QProcess( this );
			_proc->setReadChannelMode( QProcess::MergedChannels );

	 		connect( _proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( read()));
			connect( _proc, SIGNAL( started() ), QApplication::instance(), SLOT( aboutQt() ) ); 

			// connect( _proc, SIGNAL( finished(int, QProcess::ExitStatus) ), QCoreApplication::instance(), SLOT( quit() ) );
			 _proc->start(("cjpeg"),s2);

			//read();

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Now I get the About QT inboth the case that is when there would be error message and when there is no error message.
I know that the program has worked fine ( data has been succesfully hidden ) after seeing the concerned file and classicaly speaking noerroror otherwise any message is not given on thecommand console hence nothing should come in the message pop also.But The About QT screen does come everytime.
The screen snapshot is attached as zip.
What do you say??

[jacek]

Now I get the About QT inboth the case that is when there would be error message and when there is no error message.

This means that the program was started successfully. Maybe you kill it immediately? Does my test program work on your system?

[deekayt]

Dear JACEK

I have tried to run the main.cpp but could not.
How did you run it .
I understand that I should have some form ( Q Dialog) and then on click of button the object should be made
thus runing the cjpeg.exe,since you had incorporated in the constructor only.
The error which I got while doing MAKE is in the erro_text_file.txt attached alongwith.
The code is at the test.zip file.

[jacek]

I have tried to run the main.cpp but could not.
How did you run it .

My program, without any modifications, should compile without any problems. In fact it's a self contained example which verifies that cjpeg.exe output can be captured --- it doesn't need any modifications to run.

The error which I got while doing MAKE is in the erro_text_file.txt attached

If you look closely you will see, that all error messages are referring to your code. If run qmake again, it should compile.

[deekayt]

I tried your code without modification
I should be getting the error since you had supplied invalid arguments "aaa" and "bbb"

_

proc->start( "cjpeg", QStringList() << "aaa" << "bbb" );

proc->start( "cjpeg", QStringList() << "aaa" << "bbb" );

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and one should be getting the message box with the error captured.
The test1 does get compiled but when i run it nothing happens.It does get started which I see in the process runing in the Task Manager window of the operating system.
but that's all.No message at all.
I am attaching the whole folder which I compiled.
You will notice that I have edited makefile since I donot want any references to debug . Because when I make with the unedited makefile I get the error as captured in error_text1_file.txt.I did not want to repair the QT make thing hence this shortcut of first deleting all refernces to debug in makefile and then making the makefile.
Is it because of this shortcut that I am not getting the right thing from your main.cpp or is it something else.

Secondly you mentioned about the

"If you look closely you will see, that all error messages are referring to your code."

how to get this vtable error corrected

[jacek]

The test1 does get compiled but when i run it nothing happens.

How do you start it?

You will notice that I have edited makefile since I donot want any references to debug .

There is no need to edit automatically generated files. You have three possibilities:

1. compile Qt libraries in debug mode,
2. use "make -f Makefile.Release",
3. add:

   CONFIG -= debug_and_release
   CONFIG += release

   to the .pro file.

Secondly you mentioned about the

And I've also mentioned the solution.

[deekayt]

How am I suppose to start the test1.exe.
It is there in the release folder
I just double click hoping that message box with error will come but nothing happens.
I tried runing test1.exe from comd prompt but nothing happens.
I am still stuck.

[jacek]

I just double click hoping that message box with error will come but nothing happens.

If you start the program by double-clicking on it, the current directiry will be set to your desktop (AFAIR), but the program expects that cjpeg.exe will be in the current directory.

I tried runing test1.exe from comd prompt but nothing happens.

How? Is cjpeg.exe in the current directory?

[deekayt]

Once the test1.exe is made in the release directory of test1 folder I copy cjpeg.exe there with all other files which are required to be used . I have been doing the same for all other programs.After that either one double clicks the test1.exe after navigating to release folder or one can copy a shortcut to the desktop ( both work).I am sure that is not the problem.

[jacek]

What happens if you change:

proc->start( "cjpeg", QStringList() << "aaa" << "bbb" );

proc->start( "cjpeg", QStringList() << "aaa" << "bbb" );

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to:

proc->start( QCoreApplication::applicationDirPath() + "/cjpeg.exe", QStringList() << "aaa" << "bbb" );

proc->start( QCoreApplication::applicationDirPath() + "/cjpeg.exe", QStringList() << "aaa" << "bbb" );

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?

[deekayt]

It is till the same
When I see in the task manager test1.exe is runing but visually there is nothing.main.cpp looks as below

#include <QApplication>
#include <QProcess>
#include <QStringList>
#include <QMessageBox>
#include <QtDebug>
 
class Test : public QObject
{
   Q_OBJECT
   public:
      Test()
      {
	 _proc = new QProcess( this );
                _proc->setReadChannelMode( QProcess::MergedChannels );
 
	 connect( _proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( read() ) );
	 //connect( _proc, SIGNAL( finished(int, QProcess::ExitStatus) ), QCoreApplication::instance(), SLOT( quit() ) );	 
      //   _proc->start( "cjpeg", QStringList() << "aaa" << "bbb" );	
	 _proc->start( QCoreApplication::applicationDirPath() + "/cjpeg.exe", QStringList() << "aaa" << "bbb" ); 
      }
   private slots:
      void read()
      {
           QMessageBox::information( 0, "test", _proc->readAllStandardOutput() );
      }
 
   private:
      QProcess *_proc;
};
int main( int argc, char **argv )
{
   QApplication app( argc, argv );
   Test t;
   return app.exec();
}
#include "main.moc"

#include <QApplication>
#include <QProcess>
#include <QStringList>
#include <QMessageBox>
#include <QtDebug>

class Test : public QObject
{
   Q_OBJECT
   public:
      Test()
      {
	 _proc = new QProcess( this );
                _proc->setReadChannelMode( QProcess::MergedChannels );

	 connect( _proc, SIGNAL( readyReadStandardOutput() ), this, SLOT( read() ) );
	 //connect( _proc, SIGNAL( finished(int, QProcess::ExitStatus) ), QCoreApplication::instance(), SLOT( quit() ) );	 
      //   _proc->start( "cjpeg", QStringList() << "aaa" << "bbb" );	
	 _proc->start( QCoreApplication::applicationDirPath() + "/cjpeg.exe", QStringList() << "aaa" << "bbb" ); 
      }
   private slots:
      void read()
      {
           QMessageBox::information( 0, "test", _proc->readAllStandardOutput() );
      }

   private:
      QProcess *_proc;
};
int main( int argc, char **argv )
{
   QApplication app( argc, argv );
   Test t;
   return app.exec();
}
#include "main.moc"

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I was just wondering why you have given
QM

QMessageBox::information( 0, "test", _proc->readAllStandardOutput() );

QMessageBox::information( 0, "test", _proc->readAllStandardOutput() );

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should it not be "Test".Though I changed to that too but still no result.
I want to know that when you started your exe what message did you get. Can you tellme that.

[jacek]

I want to know that when you started your exe what message did you get. Can you tellme that.

Exactly the same one that cjpeg.exe outputs to the console when you start it with wrong parameters.