Executing 2 or more shell scripts simultaneously using qt

[karthikkm1987]

Hai I am a newbee in Qt i have done few basic test cases like notepad and others.
Can anyone tell me is there anyway to execute 2 shell scripts simultaneously and
taking the result and putting onto 2 separate text editors respectively.
The shell scripts are in infinite loops.
Please help me.

[Lykurg]

Have a look at QProcess. It works asynchron, so you don't have to do any special. Just use the signal and slot mechanism with it.

[myta212]

Hi,
You can use QProcess to solve your problem.
Create two QProcess and connect every that process to each editor.

/* create QProcess object */
proc1= new QProcess();
proc1->start(stringprocess1);
 
/* show output */
connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage1()) );
connect(proc1, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage1()) );
/*------------------------------------------------------------------------------------------*/
 
/* create QProcess object */
proc2= new QProcess();
proc2->start(stringprocess2);
 
/* show output */
connect(proc2, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage2()) );
connect(proc2, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage2()) );

/* create QProcess object */
proc1= new QProcess();
proc1->start(stringprocess1);
 
/* show output */
connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage1()) );
connect(proc1, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage1()) );
/*------------------------------------------------------------------------------------------*/

/* create QProcess object */
proc2= new QProcess();
proc2->start(stringprocess2);
 
/* show output */
connect(proc2, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage2()) );
connect(proc2, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage2()) );

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You can get simple tutorial how to use QProcess at here http://toto-share.com/2011/07/qt-qprocess-tutorial.
Are this method solve your problem?

Best regards,

myta

[karthikkm1987]

Thank you I will Try that QProcess example you have given.

[karthikkm1987]

Hai I am able to compile the program.But The gui is not running the shell scripts.
here is the code.

modbusarm.pro:--

#-------------------------------------------------
#
# Project created by QtCreator 2011-12-05T10:21:56
#
#-------------------------------------------------

QT += core gui

TARGET = modbusarm
TEMPLATE = app


SOURCES += main.cpp


HEADERS += modbusarm.h ui_modbusarm.h

FORMS += modbusarm.ui

header files:-
modbusarm.h

#ifndef MODBUSARM_H
#define MODBUSARM_H

#include<QDialog>
#include<QtGui>
#include<QProcess>
#include<QMainWindow>
#include"ui_modbusarm.h"
#include<QByteArray>

//#include<Qt3Support/Q3Process>

class modbusarmublic QMainWindow,public Ui_modbusarm
{
Q_OBJECT

public:

QProcess* proc1;
QProcess* proc2;
modbusarm()
{
setupUi(this);
/* create QProcess object */

proc1= new QProcess();
QString stringproc1="/home/karthik/Desktop/hai ";

proc1->start(stringproc1);



/* show output */
// connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(readAllStandardOutput()) );

connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage1()) );

// connect(proc1, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage1()) );

/*------------------------------------------------------------------------------------------*/



/* create QProcess object */
proc2= new QProcess();
QString stringproc2="/home/karthik/Desktop/hai";
proc2->start(stringproc2);

// connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(readAllStandardOutput()) );

/* show output */

connect(proc2, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage2()) );

//connect(proc2, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage2()) );


}

void rightMessage1()
{
QByteArray data = proc1->readAllStandardOutput();
//arm1->setText(QString data);
QString text = arm1->text() + QString(data);
arm1->setText(text);


}
void rightMessage2()
{
QByteArray data1 = proc2->readAllStandardOutput();


QString text1 = arm2->text() + QString(data1);
arm2->setText(text1);


}


// ~modbusarm();

private:
//Ui::modbusarm *ui;
};

#endif // MODBUSARM_H

modbusarm.cpp: source file

#include "modbusarm.h"
#include "ui_modbusarm.h"

modbusarm::modbusarm(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::modbusarm)
{
ui->setupUi(this);
}

modbusarm::~modbusarm()
{
delete ui;
}

main.cpp

#include <QApplication>
#include "modbusarm.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
modbusarm* w=new modbusarm();
w->show();

return a.exec();
}


the shell script is

#!/bin/bash
c=0
while [ 1 ]
do

((c++))
echo " hai $c times "
sleep 1
done
#######################################

Please Help Me.
Please Help Me.
The output of shell scripts should be continuously outputted at Line edit of GU I have attached the UI file also.


modbusarm.uimodbusarm.tar.gz

[ChrisW67]

Please edit your post and put your code into [code][/code] tags.

Here are some tips:

• Post the actual buildable code in an easily recognised form (i.e. not a gzipped, gzipped, tar file)
• Did I mention that your code should compile before you post it?
• At the moment the modbusarm.cpp file is not part of the project.
• The ui_*h file should not be listed in HEADERS.
• The modbusarm.h and modbusarm.cpp files contain competing implementations. Generally, the header file should contain only declarations and the cpp file the implementation.
• rightMessage1() and rightMessage2() are not declared as slots as far as I can see. If the program compile and ran your connect() calls would generate an error message.

[karthikkm1987]

Hai I have edited as you asked please check my previous post.

[ChrisW67]

No you didn't. Anyway, please see the bullet points in my last post for guidance toward your solution. Until you have code that will compile...

[karthikkm1987]

hai ChrisW67 thanks for your help.this program given below executes well with shell scripts.
the shell scripts run endlessly until i close it.
But I want to ask you is there any way that a shell script containing a .c executable file is executed in the shell script.
when I tried with the executable c program ,it didnt run.
I will give you a general example of the script.
hellosh:-
#!/bin/bash
echo "executing ./hey1"
./hey1
hello.c:-
#include<stdio.h>
main()
{
int i=0;
for(;
{
printf("hello %d\n",i);
i++;
sleep(1);
}
}

and i did
cc hello.c -o hey1


modbusarm1.pro:-
#-------------------------------------------------
#
# Project created by QtCreator 2011-12-09T11:28:02
#
#-------------------------------------------------

QT += core gui

TARGET = modbusarm1
TEMPLATE = app


SOURCES += main.cpp\
modbusarm1.cpp

HEADERS += modbusarm1.h


FORMS += modbusarm1.ui

RESOURCES +=

main.cpp:-

#include <QtGui/QApplication>
#include "modbusarm1.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
modbusarm1 w;
w.show();

return a.exec();
}

modbusarm1.h:-
#ifndef MODBUSARM1_H
#define MODBUSARM1_H
#include<QProcess>
#include <QWidget>
//#include<QtGui>

namespace Ui {
class modbusarm1;
}

class modbusarm1 : public QWidget
{
Q_OBJECT

public:
modbusarm1(QWidget *parent = 0);
~modbusarm1();

QProcess* proc1;
QProcess* proc2;
// QTextEdit* arm_1;
// QTextEdit* arm_2;

public slots:
void rightMessage1();
void rightMessage2();


private:
Ui::modbusarm1 *ui;
};

#endif // MODBUSARM1_H


modbusarm1.cpp:-
#include "modbusarm1.h"
#include "ui_modbusarm1.h"
#include<QWidget>
#include<QProcess>
#include<QIODevice>
//#include<QtGui>

modbusarm1::modbusarm1(QWidget *parent) :
QWidget(parent),
ui(new Ui::modbusarm1)
{
ui->setupUi(this);
//QProcess* proc1;
//QProcess* proc2;
proc1= new QProcess();
//QString stringproc1="/home/karthik/Project2ndyearfinal/modbus_multiple_devices/adcserver1";
QString stringproc1="/home/karthik/hellosh";
// /home/karthik/Project2ndyearfinal/modbus_multiple_devices/adcserver1sh
proc1->start(stringproc1);
/* show output */
// connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(readAllStandardOutput()) );
connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage1()) );

// connect(proc1, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage1()) );

/*------------------------------------------------------------------------------------------*/
/* create QProcess object */
proc2= new QProcess();
// QString stringproc2="/home/karthik/Project2ndyearfinal/modbus_multiple_devices/adcserver2";
QString stringproc2="/home/karthik/hello";

proc2->start(stringproc2);
// connect(proc1, SIGNAL(readyReadStandardOutput()),this, SLOT(readAllStandardOutput()) );
/* show output */
connect(proc2, SIGNAL(readyReadStandardOutput()),this, SLOT(rightMessage2()) );
//connect(proc2, SIGNAL(readyReadStandardError()), this, SLOT(wrongMessage2()) );
connect(ui->close,SIGNAL(clicked()),proc1,SLOT(kill()));
connect(ui->close,SIGNAL(clicked()),proc2,SLOT(kill()));

}

void modbusarm1::rightMessage1()
{
QByteArray data = proc1->readAllStandardOutput();

// arm_1->setText(QString data);
QString text2 = ui->arm_1->text() + QString(data);
ui->arm_1->setText(text2);
// connect(ui->close,SIGNAL(clicked()),proc1,SLOT(proc1->kill());
// connect(ui->close,SIGNAL(clicked()),proc1,SLOT(kill()));


}
void modbusarm1::rightMessage2()
{
QByteArray data1 = proc2->readAllStandardOutput();
// arm_2->setText(QString data1);
QString text1 = ui->arm_2->text() + QString(data1);

ui->arm_2->setText(text1);
// connect(ui->close,SIGNAL(clicked()),proc1,SLOT(proc2->close());

// connect(ui->close,SIGNAL(clicked()),proc2,SLOT(close()));

}

modbusarm1::~modbusarm1()
{
delete ui;
}

modbusarm1.ui:-
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>modbusarm1</class>
<widget class="QWidget" name="modbusarm1">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>400</width>
<height>300</height>
</rect>
</property>
<property name="windowTitle">
<string>modbusarm1</string>
</property>
<widget class="QLabel" name="Friendly_Arm1">
<property name="geometry">
<rect>
<x>120</x>
<y>50</y>
<width>141</width>
<height>31</height>
</rect>
</property>
<property name="text">
<string>Friendly Arm1</string>
</property>
</widget>
<widget class="QLabel" name="Friendly_Arm2">
<property name="geometry">
<rect>
<x>120</x>
<y>150</y>
<width>141</width>
<height>31</height>
</rect>
</property>
<property name="text">
<string>Friendly Arm2</string>
</property>
</widget>
<widget class="QLineEdit" name="arm_1">
<property name="geometry">
<rect>
<x>120</x>
<y>90</y>
<width>171</width>
<height>31</height>
</rect>
</property>
</widget>
<widget class="QLineEdit" name="arm_2">
<property name="geometry">
<rect>
<x>120</x>
<y>190</y>
<width>171</width>
<height>31</height>
</rect>
</property>
</widget>
<widget class="QPushButton" name="close">
<property name="geometry">
<rect>
<x>150</x>
<y>240</y>
<width>97</width>
<height>31</height>
</rect>
</property>
<property name="text">
<string>Close</string>
</property>
</widget>
</widget>
<layoutdefault spacing="6" margin="11"/>
<resources/>
<connections>
<connection>
<sender>close</sender>
<signal>clicked()</signal>
<receiver>modbusarm1</receiver>
<slot>close()</slot>
<hints>
<hint type="sourcelabel">
<x>231</x>
<y>260</y>
</hint>
<hint type="destinationlabel">
<x>306</x>
<y>250</y>
</hint>
</hints>
</connection>
</connections>
</ui>

[Spitfire]

Could you please edit your post and wrap the code inside [code] tags?
Without them it's just unreadable mess...

[karthikkm1987]

sorry spitfire for the code mess.
Anyways I came to know how to execute c program in shell script I had to use /path/program instead of ./path/program

[karthikkm1987]

hai is it possible for seperating the outputs which i have got.
I mean is it possible to extract the required data.?
Like is it possible to output hello 1,hello 3 .....so on in one line edit
and print hello 2,hello 4,............so on in another line edit.As shown in the below code it is in infinite loop.
after the program is executed using QProcess.

#include<stdio.h>
main()
{
int i=0;
for(;;)
{
printf("hello %d\n",i);
i++;
sleep(1);
}

#include<stdio.h>
main()
{
int i=0;
for(;;)
{
printf("hello %d\n",i);
i++;
sleep(1);
}

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}