When i used QProcess it returns warning: 'parent' may be used uninitialized in this function [-Wmaybe-uninitialized]

[stackprogramer]

i want to uses QProcess in my app. according below link:
i added too below requirements:

Header:	#include <QProcess>
qmake:	QT += core

http://doc.qt.io/qt-5/qprocess.html

my os is ubuntu and Qt5.7, too my project is console project.
can any guide?
thanks in advance

 QObject *socket;
    ...
    QString program = "./path/to/Qt/examples/widgets/analogclock";
    QStringList arguments;
    arguments << "-style" << "fusion";

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

it returns this errors:

/home/sp/Documents/socket/UDPSocketConsole/main.cpp:21: warning: 'socket' may be used uninitialized in this function [-Wmaybe-uninitialized]
     QProcess *myProcess=new QProcess(socketradar);

[jsulm]

@stackprogramer In the code you pasted you did not initialize socket! It should point to an object which you want to use as parent.

[stackprogramer]

hi,yes i know it is warning. in my source instead parent is socket here is my typo.
when i inserted qDebug() <<"part1" qDebug() <<"part2" qDebug() <<"part3"in my source:

QObject *socket;
 qDebug() <<"part1" ;
    QString program = "./path/to/Qt/examples/widgets/analogclock";
    QStringList arguments;
    arguments << "-style" << "fusion";
qDebug() <<"part2" ;
    QProcess *myProcess = new QProcess(socket);
qDebug() <<"part3" ;
    myProcess->start(program, arguments);

part 1 and 2 print in console but part 3 is can not print console. i want to use QProcess to communicate to a other c++ executable file.
but QProcess doesn't work for me.
thanks

[jsulm]

@stackprogramer Your socket pointer is not initialized! You need to assign it a pointer to an existing object.

[stackprogramer]

Re: when i used QProcess it returns warning: 'parent' may be used uninitialized in this function [-Wmaybe-uninitialized]

finally i change my method. i used this structure:
i had a ddd exe file in ubuntu that when i execute it, it returns "Hello World!"

i used this source it works
best regards stackprogramer

#include <QCoreApplication>

#include <myudp.h>
#include <QProcess>
#include <QObject>




int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug()<<"hi";

//    MyUDP test;
//   test.HelloUDP();
//   test.readyRead();
   // QObject *socketradar;

    QString program="/home/sp/Documents/socket/UDPSocketConsole/ddd";
    QStringList arguments;
    arguments<<"1";
    qDebug()<<"hi2";

    QProcess myProcess;
    qDebug()<<"hi3";


    myProcess.start(program,arguments);

    //qDebug()<< myProcess<<"hi";
  myProcess.waitForFinished();
  qDebug()<<"hi4";
  QByteArray  output=myProcess.readAllStandardOutput();
  qDebug()<<output;
   // return a.exec();
}

now we can see our out exe file

[nanor]

@jsulm Could you please explain how to do that?
Thank you

[JonB]

@nanor
How to do what "that"?

[Pl45m4]

@nanor

This is very basic C++

Declaration

• QObject *socket;

Initialization could look like this:
(assigns an address to that pointer)

• socket = new QObject();

Otherwise socket is no valid parent for QProcess

[nanor]

@JonB The initialization. I set it to this and the code worked well. Thank you so much.

[nanor]

@Pl45m4 Thank you so much. I set it to "This" and my code worked well.