Difference between revisions of "QtConcurrent-run-member-function"

From Qt Wiki
Jump to: navigation, search
(form.ui: code lang=xml)
 
(6 intermediate revisions by 4 users not shown)
Line 1: Line 1:
[[Category:snippets]]<br />[toc align_right=&quot;yes&amp;quot; depth=&quot;3&amp;quot;]
+
[[Category:HowTo]]
  
 
You can call a member function of an object using QtConcurrent::run as follows. (Note for an inherited member function, please see [[QtConcurrent-run-inherited-member-function]]).
 
You can call a member function of an object using QtConcurrent::run as follows. (Note for an inherited member function, please see [[QtConcurrent-run-inherited-member-function]]).
Line 5: Line 5:
 
== form.h ==
 
== form.h ==
  
<code>#ifndef FORM_H<br />#define FORM_H
+
<code>
 +
#ifndef FORM_H
 +
#define FORM_H
  
#include &quot;ui_form.h&amp;quot;
+
#include "ui_form.h"
 
+
#include "MyClass.h"
#include &quot;MyClass.h&amp;quot;
 
 
 
class Form : public QWidget, private Ui::Form<br />{<br />Q_OBJECT
 
  
 +
class Form : public QWidget, private Ui::Form
 +
{
 +
Q_OBJECT
 
public slots:
 
public slots:
 +
void on_pushButton_clicked();
  
void on_pushButton_clicked();
+
public:
 
+
Form(QWidget *parent = 0);
public:<br /> Form(QWidget *parent = 0);
 
 
 
private:<br /> MyClass MyObject;
 
  
 +
private:
 +
MyClass MyObject;
 
};
 
};
  
#endif</code>
+
#endif
 +
</code>
  
 
== form.cpp ==
 
== form.cpp ==
  
<code><br />#include &lt;QtGui&amp;gt;<br />#include &lt;QImage&amp;gt;
+
<code>
 +
#include <QtGui>
 +
#include <QImage>
  
#include &quot;form.h&amp;quot;
+
#include "form.h"
  
#include &lt;iostream&amp;gt;
+
#include <iostream>
  
Form::Form(QWidget *parent)<br /> : QWidget(parent)<br />{<br /> setupUi(this);
+
Form::Form(QWidget *parent)
 +
: QWidget(parent)
 +
{
 +
setupUi(this);
 +
}
  
 +
void Form::on_pushButton_clicked()
 +
{
 +
// Start the computation.
 +
QFuture<void> future = QtConcurrent::run(&this->MyObject, &MyClass::LongFunction);
 
}
 
}
 
+
</code>
void Form::on_pushButton_clicked()<br />{<br /> // Start the computation.<br /> QFuture&amp;lt;void&amp;gt; future = QtConcurrent::run(&amp;this-&gt;MyObject, &amp;MyClass::LongFunction);
 
 
 
}<br /></code>
 
  
 
== form.ui ==
 
== form.ui ==
  
<code><br />&amp;lt;?xml version=&quot;1.0&amp;quot; encoding=&quot;UTF-8&amp;quot;?&amp;gt;<br />&lt;ui version=&quot;4.0&amp;quot;&gt;<br /> &lt;class&amp;gt;Form&amp;lt;/class&amp;gt;<br /> &lt;widget class=&quot;QWidget&amp;quot; name=&quot;Form&amp;quot;&gt;<br /> &lt;property name=&quot;geometry&amp;quot;&gt;<br /> &lt;rect&amp;gt;<br /> &lt;x&amp;gt;0&amp;lt;/x&amp;gt;<br /> &lt;y&amp;gt;0&amp;lt;/y&amp;gt;<br /> &lt;width&amp;gt;400&amp;lt;/width&amp;gt;<br /> &lt;height&amp;gt;300&amp;lt;/height&amp;gt;<br /> &lt;/rect&amp;gt;<br /> &lt;/property&amp;gt;<br /> &lt;property name=&quot;windowTitle&amp;quot;&gt;<br /> &lt;string&amp;gt;Form&amp;lt;/string&amp;gt;<br /> &lt;/property&amp;gt;<br /> &lt;layout class=&quot;QVBoxLayout&amp;quot; name=&quot;verticalLayout&amp;quot;&gt;<br /> &lt;item&amp;gt;<br /> &lt;widget class=&quot;QPushButton&amp;quot; name=&quot;pushButton&amp;quot;&gt;<br /> &lt;property name=&quot;text&amp;quot;&gt;<br /> &lt;string&amp;gt;PushButton&amp;lt;/string&amp;gt;<br /> &lt;/property&amp;gt;<br /> &lt;/widget&amp;gt;<br /> &lt;/item&amp;gt;<br /> &lt;/layout&amp;gt;<br /> &lt;/widget&amp;gt;<br /> &lt;resources/&amp;gt;<br /> &lt;connections/&amp;gt;<br />&lt;/ui&amp;gt;<br /></code>
+
<code lang="xml">
 +
<?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>
 +
</code>
  
 
== MyClass.h ==
 
== MyClass.h ==
  
<code><br />#ifndef MyClass_H<br />#define MyClass_H
+
<code>
 +
#ifndef MyClass_H
 +
#define MyClass_H
  
#include &lt;iostream&amp;gt;
+
#include <iostream>
  
class MyClass<br />{<br />public:
+
class MyClass
 
+
{
void LongFunction()<br /> {<br /> for( int count = 0; count &lt; 5; count++ )<br /> {<br /> sleep( 1 );<br /> std::cout &lt;&lt; &quot;Ping long!&quot; &lt;&lt; std::endl;<br /> }<br /> }<br />};
+
public:
 +
void LongFunction() {
 +
  for( int count = 0; count < 5; count++ ) {
 +
  sleep( 1 );
 +
  std::cout << "Ping long!" << std::endl;
 +
  }
 +
}
 +
};
  
#endif<br /></code>
+
#endif
 +
</code>
  
 
== main.cpp ==
 
== main.cpp ==
  
<code><br />#include &lt;QApplication&amp;gt;<br />#include &lt;QObject&amp;gt;<br />#include &lt;QThread&amp;gt;
+
<code>
 +
#include <QApplication>
 +
#include <QObject>
 +
#include <QThread>
 +
#include <iostream>
  
#include &lt;iostream&amp;gt;
+
#include "form.h"
  
#include &quot;form.h&amp;quot;
+
int main(int argc, char*argv[]) {
 
+
QApplication app(argc, argv);
int main(int argc, char*argv[])<br />{<br /> QApplication app(argc, argv);
+
Form form;
 
+
form.show();
Form form;
+
return app.exec();
 
+
}
form.show();
+
</code>
 
 
return app.exec&amp;amp;#40;&amp;#41;;
 

Latest revision as of 02:24, 18 May 2017


You can call a member function of an object using QtConcurrent::run as follows. (Note for an inherited member function, please see QtConcurrent-run-inherited-member-function).

form.h

#ifndef FORM_H
#define FORM_H

#include "ui_form.h"
#include "MyClass.h"

class Form : public QWidget, private Ui::Form
{
 Q_OBJECT
public slots:
 void on_pushButton_clicked();

public:
 Form(QWidget *parent = 0);

private:
 MyClass MyObject;
};

#endif

form.cpp

#include <QtGui>
#include <QImage>

#include "form.h"

#include <iostream>

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

void Form::on_pushButton_clicked()
{
 // Start the computation.
 QFuture<void> future = QtConcurrent::run(&this->MyObject, &MyClass::LongFunction);
}

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>

MyClass.h

#ifndef MyClass_H
#define MyClass_H

#include <iostream>

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

#endif

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();
}