How to launch other applications in Qt
kiran10182
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//openUrl is static method of class QDesktopServices, so no need to create instance of it. | //openUrl is static method of class QDesktopServices, so no need to create instance of it. | ||
//Open URL in browser | //Open URL in browser | ||
| − | QDesktopServices::openUrl(QUrl | + | QDesktopServices::openUrl(QUrl("http://discussion.forum.nokia.com/forum/forumdisplay.php?f=40")); |
</code> | </code> | ||
<br> | <br> | ||
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//openUrl is static method of class QDesktopServices, so no need to create instance of it. | //openUrl is static method of class QDesktopServices, so no need to create instance of it. | ||
//to open vedio file in realplayer give full path here. | //to open vedio file in realplayer give full path here. | ||
| − | QDesktopServices::openUrl(QUrl | + | QDesktopServices::openUrl(QUrl("file:///e:/Videos/Nokia 5800 XpressMusic.mp4")); |
</code> | </code> | ||
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//openUrl is static method of class QDesktopServices, so no need to create instance of it. | //openUrl is static method of class QDesktopServices, so no need to create instance of it. | ||
//Open email client. | //Open email client. | ||
| − | QDesktopServices::openUrl(QUrl | + | QDesktopServices::openUrl(QUrl("mailto:ratang.gir@gmail.com?subject=Testing feedback&body=HelloFriend")); |
</code> | </code> | ||
<br> | <br> | ||
Revision as of 23:51, 6 April 2011
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Contents |
Overview
Frequently we need to start other applications from our application. For example, need to launch browser to open web page or need to launch player to open video link. Also, sometime need to start our other application from current one. In Qt class QProcess is used to start external programs and to communicate with them.
The class QDesktopServices provides methods for accessing common desktop services, like browser, player, e-mail client, etc.
QDesktopServices has a static method called openUrl(), which opens the given URL in the appropriate Web browser for the user's desktop environment, and returns true if successful; otherwise returns false. If the URL is a reference to a local file (i.e., the URL scheme is "file") then it will be opened with a suitable application instead of a Web browser. For example, you can use URL "file:///c:/data/abc.png" to open abc.png in its default application. similarly you can play audio/video.
This snippet can be self-signed. As it does not use any API which require developer/certified signing.
Preconditions
- Download and Install latest version Qt for Symbian - Installation packages which has links on how to install the latest version
Launching web browser
Header required
#include <QDesktopServices>
#include <QUrl>
Source code
//openUrl is static method of class QDesktopServices, so no need to create instance of it.
//Open URL in browser
QDesktopServices::openUrl(QUrl("http://discussion.forum.nokia.com/forum/forumdisplay.php?f=40"));
Launching RealPlayer
Header required
#include <QDesktopServices>
#include <QUrl>
Source code
//openUrl is static method of class QDesktopServices, so no need to create instance of it.
//to open vedio file in realplayer give full path here.
QDesktopServices::openUrl(QUrl("file:///e:/Videos/Nokia 5800 XpressMusic.mp4"));
Launching Email Client
Header required
#include <QDesktopServices>
#include <QUrl>
Source code
//openUrl is static method of class QDesktopServices, so no need to create instance of it.
//Open email client.
QDesktopServices::openUrl(QUrl("mailto:ratang.gir@gmail.com?subject=Testing feedback&body=HelloFriend"));
Launching other applications
Header required
#include <QProcess>The signal error() of QProcess is emitted when an error occurs with the process. The specified error describes the type of error that occurred.
Header file
void processError(QProcess::ProcessError err);
QProcess process;
Source code
QtAppLauncher::QtAppLauncher(QWidget *parent)
: QMainWindow(parent)
{
//connect error() to slot processError() to get error, if occurs.
QObject::connect( &process, SIGNAL(error(QProcess::ProcessError)),
this, SLOT(processError(QProcess::ProcessError)));
//pass the name of executable that you want to launch. i have installed helloworld so passed helloworld.
process.start("helloworld");
}
//get errors, if any
void QtAppLauncher::processError(QProcess::ProcessError err)
{
switch(err)
{
case QProcess::FailedToStart:
QMessageBox::information(0,"FailedToStart","FailedToStart");
break;
case QProcess::Crashed:
QMessageBox::information(0,"Crashed","Crashed");
break;
case QProcess::Timedout:
QMessageBox::information(0,"FailedToStart","FailedToStart");
break;
case QProcess::WriteError:
QMessageBox::information(0,"Timedout","Timedout");
break;
case QProcess::ReadError:
QMessageBox::information(0,"ReadError","ReadError");
break;
case QProcess::UnknownError:
QMessageBox::information(0,"UnknownError","UnknownError");
break;
default:
QMessageBox::information(0,"default","default");
break;
}
}
Postconditions
The code snippet is expected to launch browser, realplayer and helloworld application.
Code Example
- Download the working Code Example.
