×
Namespaces

Variants
Actions
Revision as of 14:29, 15 January 2010 by tanjaluodes (Talk | contribs)

Launching a native application from Qt

From Nokia Developer Wiki
Jump to: navigation, search

Template:KBCS

Article Metadata
Tested with
Devices(s): Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition, FP1, FP2
S60 5th Edition
Symbian
Article
Keywords: QProcess
Created: (29 Apr 2009)
Last edited: tanjaluodes (15 Jan 2010)

Contents

Overview

This code snippet shows how to launch a native Symbian application from Qt for S60.

Note: In order to use this code, you need to have Qt for S60 installed on your platform.


Preconditions


Header

The ProcessHandler starts the process and listens for its states.

#include <QObject>
#include <QProcess>
 
class ProcessHandler : public QObject
{
Q_OBJECT
 
public:
ProcessHandler(QObject *parent = 0);
~ProcessHandler();
 
public:
void StartCameraApp();
 
public Q_SLOTS:
void stateChanged(QProcess::ProcessState state);
void error(QProcess::ProcessError error);
 
private:
QProcess* process;
};


Source

Create QProcess and start listening for process state changes.

ProcessHandler::ProcessHandler(QObject *parent)
: QObject(parent)
{
process = new QProcess(this);
QObject::connect(process, SIGNAL(stateChanged(QProcess::ProcessState)),
this, SLOT(stateChanged(QProcess::ProcessState)));
}

Class descruction:

ProcessHandler::~ProcessHandler()
{
if (process->state() != QProcess::NotRunning)
{
// Close process if it is running
process->close();
}
}


Start the Symbian native camera Cameraapp.exe:

void ProcessHandler::StartCameraApp()
{
QString program = "Cameraapp.exe";
process->start(program);
}

QProcess signals the error to the error slot:

void ProcessHandler::error(QProcess::ProcessError error)
{
switch (error)
{
case QProcess::FailedToStart:
case QProcess::Crashed:
case QProcess::Timedout:
case QProcess::ReadError:
case QProcess::WriteError:
case QProcess::UnknownError:
{
// TODO: Handle error
break;
}
default:
{
break;
}
};
}

QProcess signals the process state changes to the stateChanged slot.

void ProcessHandler::stateChanged(QProcess::ProcessState state)
{
switch (state)
{
case QProcess::NotRunning:
case QProcess::Starting:
case QProcess::Running:
{
// TODO: do what you want with
// different states
break;
}
default:
{
break;
}
};
}


Postconditions

The Symbian native camera is started from the Qt for S60 application.

81 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.

 

Thank you!

We appreciate your feedback.

×