QtConcurrent-run-free-function: Difference between revisions

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[[Category:snippets]]
[[Category:HowTo]]
 
[toc align_right="yes" depth="3"]
 
To call a free function using QtConcurrent::run, simply pass the function name.
To call a free function using QtConcurrent::run, simply pass the function name.


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#endif
#endif
</code>
</code>


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std::cout << "exit." << std::endl;
std::cout << "exit." << std::endl;
}
}
</code>
</code>


== form.ui ==
== form.ui ==


<code>
<code lang="xml">
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<ui version="4.0">
Line 96: Line 91:
  <connections/>
  <connections/>
</ui>
</ui>
</code>
</code>


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#include <QObject>
#include <QObject>
#include <QThread>
#include <QThread>
#include <iostream>
#include <iostream>


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{
{
  QApplication app(argc, argv);
  QApplication app(argc, argv);
 
Form form;
Form form;
form.show();
 
return app.exec();
form.show();
 
return app.exec();
}
}
</code>

Latest revision as of 02:18, 18 May 2017

To call a free function using QtConcurrent::run, simply pass the function name.

form.h

#ifndef FORM_H
#define FORM_H

#include "ui_form.h"

class Form : public QWidget, private Ui::Form
{
Q_OBJECT

public slots:

void on_btnOpen_clicked();

public:
 Form(QWidget *parent = 0);

};

#endif

form.cpp

#include <QtGui>
#include <QImage>

#include "form.h"

#include <iostream>

Form::Form(QWidget *parent)
 : QWidget(parent)
{
 setupUi(this);
}

void LongFunction()
{
 for( int count = 0; count < 5; count++ )
 {
 sleep( 1 );
 std::cout << "Ping long!" << std::endl;
 }
}

void Form::on_btnOpen_clicked()
{
 QFuture<void> result = QtConcurrent::run ( LongFunction );
 //result.waitForFinished();

std::cout << "exit." << std::endl;
}

form.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="QWidget" name="Form">
 <property name="geometry">
 <rect>
 <x>0</x>
 <y>0</y>
 <width>400</width>
 <height>300</height>
 </rect>
 </property>
 <property name="windowTitle">
 <string>Form</string>
 </property>
 <layout class="QVBoxLayout" name="verticalLayout">
 <item>
 <widget class="QPushButton" name="pushButton">
 <property name="text">
 <string>PushButton</string>
 </property>
 </widget>
 </item>
 </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

main.cpp

#include <QApplication>
#include <QObject>
#include <QThread>
#include <iostream>

#include "form.h"

int main(int argc, char*argv[])
{
 QApplication app(argc, argv);
 Form form;
 form.show();
 return app.exec();
}