How to launch other applications in Qt
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| − | [[Category:Qt]] | + | [[Category:Qt]][[Category:How To]][[Category:Code Examples]] |
| − | {{ | + | {{Abstract|This code example shows how to start other applications from within a Qt application. It demonstrates [http://doc.qt.nokia.com/stable/qdesktopservices.html#openUrl QDesktopServices::openUrl()] for opening URLs in the default browser and [http://doc.qt.nokia.com/stable/qprocess.html QProcess] for launching arbitrary applications. }} |
| − | {{ArticleMetaData | + | {{ArticleMetaData <!-- v1.2 --> |
| − | | | + | |sourcecode= [[Media:QtAppLauncher.zip]] |
| − | | | + | |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) --> |
|devices= Nokia 5800 | |devices= Nokia 5800 | ||
| − | | | + | |sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) --> |
| − | | | + | |platform= Qt |
| − | | | + | |devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) --> |
| − | |keywords=QDesktopServices::openUrl(), QProcess::start() | + | |dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 --> |
| − | + | |signing= Self-Signed | |
| − | | | + | |capabilities= None |
| − | | | + | |keywords= QDesktopServices::openUrl(), QProcess::start() |
| − | | | + | |language= <!-- Language category code for non-English topics - e.g. Lang-Chinese --> |
| − | | | + | |translated-by= <!-- [[User:XXXX]] --> |
| − | | | + | |translated-from-title= <!-- Title only --> |
| − | | | + | |translated-from-id= <!-- Id of translated revision --> |
| − | |author=[[User:Savaj]] | + | |review-by= <!-- After re-review: [[User:username]] --> |
| + | |review-timestamp= <!-- After re-review: YYYYMMDD --> | ||
| + | |update-by= <!-- After significant update: [[User:username]]--> | ||
| + | |update-timestamp= <!-- After significant update: YYYYMMDD --> | ||
| + | |creationdate= 20090610 | ||
| + | |author= [[User:Savaj]] | ||
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==Launching web browser== | ==Launching web browser== | ||
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'''Header required''' | '''Header required''' | ||
| − | <code cpp> | + | <code cpp-qt> |
#include <QDesktopServices> | #include <QDesktopServices> | ||
#include <QUrl> | #include <QUrl> | ||
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'''Source code''' | '''Source code''' | ||
| − | <code cpp> | + | <code cpp-qt> |
//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("http:// | + | QDesktopServices::openUrl(QUrl("http://www.developer.nokia.com/Community/Discussion/forumdisplay.php?40-General-Symbian-C")); |
</code> | </code> | ||
<br> | <br> | ||
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'''Header required''' | '''Header required''' | ||
| − | <code cpp> | + | <code cpp-qt> |
#include <QDesktopServices> | #include <QDesktopServices> | ||
#include <QUrl> | #include <QUrl> | ||
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'''Source code''' | '''Source code''' | ||
| − | <code cpp> | + | <code cpp-qt> |
//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. | ||
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'''Header required''' | '''Header required''' | ||
| − | <code cpp> | + | <code cpp-qt> |
#include <QDesktopServices> | #include <QDesktopServices> | ||
#include <QUrl> | #include <QUrl> | ||
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'''Source code''' | '''Source code''' | ||
| − | <code cpp> | + | <code cpp-qt> |
//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. | ||
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'''Header required''' | '''Header required''' | ||
| − | <code cpp> | + | <code cpp-qt> |
#include <QProcess> | #include <QProcess> | ||
</code> | </code> | ||
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'''Header file''' | '''Header file''' | ||
| − | <code cpp> | + | <code cpp-qt> |
void processError(QProcess::ProcessError err); | void processError(QProcess::ProcessError err); | ||
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'''Source code''' | '''Source code''' | ||
| − | <code cpp> | + | <code cpp-qt> |
QtAppLauncher::QtAppLauncher(QWidget *parent) | QtAppLauncher::QtAppLauncher(QWidget *parent) | ||
: QMainWindow(parent) | : QMainWindow(parent) | ||
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== Code Example == | == Code Example == | ||
| − | * Download [[File:QtAppLauncher.zip]]. | + | * Download [[File:QtAppLauncher.zip]].[[Category:MeeGo Harmattan]] [[Category:Symbian]] |
| − | + | <!-- Translation --> [[pt:Como executar o navegador Web, RealPlayer, e outras aplicações, em Qt]] | |
| − | [[Category: | + | |
Latest revision as of 04:17, 11 October 2012
This code example shows how to start other applications from within a Qt application. It demonstrates QDesktopServices::openUrl() for opening URLs in the default browser and QProcess for launching arbitrary applications.
Article Metadata
Code Example
Source file: Media:QtAppLauncher.zip
Tested with
Devices(s): Nokia 5800
Compatibility
Platform(s): Qt
Platform Security
Signing Required: Self-Signed
Capabilities: None
Article
Keywords: QDesktopServices::openUrl(), QProcess::start()
Created: savaj
(10 Jun 2009)
Last edited: hamishwillee
(11 Oct 2012)
Contents |
Launching web browser
The class QDesktopServices provides methods for accessing common desktop services, like browser, player, e-mail client, etc. We use QDesktopServices::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.
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://www.developer.nokia.com/Community/Discussion/forumdisplay.php?40-General-Symbian-C"));
Launching RealPlayer
QProcess is used to start external programs and to communicate with them.
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
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 File:QtAppLauncher.zip.
