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The System Information example uses a tabbed dialog, with each tab representing a particular type of data: versions, network and so on.
To access the information, the example creates objects belonging to the System Information classes
| Access to details of the currently active phone profile | |
| Service for applications to synchronize their activity | |
| Access to battery and power information from the system | |
| Access to device information from the system | |
| Access to display information from the system | |
| Access to various general information from the system. NOTE: In the future, parts of the QtSystemInfo API may be moved and renamed into an existing Qt class that provides similiar functionality | |
| Access to various networking status and signals | |
| Access to screen saver and blanking | |
| Access to disk storage information from the system | 
Here are some examples that show how the example application reads the device information.
The current language
     systemInfo = new QSystemInfo(this);
     curLanguageLineEdit->setText( systemInfo->currentLanguage());
Device information, starting with the battery level
     bi = new QSystemBatteryInfo(this);
     ...
     chargerTypeChanged(bi->chargerType());
     currentBatStat = bi->batteryStatus();
The battery status is an enum, QSystemBatteryInfo::BatteryStatus, that indicates various battery levels and their significance, e.g., QSystemBatteryInfo::BatteryVeryLow.
The manufacturer id and the product name
     manufacturerLabel->setText(di->manufacturer());
     ...
     productLabel->setText(di->productName());
Other information is stored as bitwise flags. The following code shows the input methods being determined using flags.
     QSystemDeviceInfo::InputMethodFlags methods = di->inputMethodType();
     QStringList inputs;
     if ((methods & QSystemDeviceInfo::Keys)=QSystemDeviceInfo::Keypad){
         inputs << "Keys";
     }
     if ((methods & QSystemDeviceInfo::Keypad)=QSystemDeviceInfo::Keypad) {
         inputs << "Keypad";
     }
Various capabilities of the device can be found by testing for features. In the example a Feature combo box, on the General tab, has a hard coded list of features. When a listed feature is selected the getFeature() function is called with the index which is handled by applying a test to the corresponding feature.
     QSystemInfo::Feature feature;
     switch(index) {
     ...
     case 1:
         feature = QSystemInfo::BluetoothFeature;
     ...
     QSystemInfo si;
     featuresLineEdit->setText((si.hasFeatureSupported(feature) ? "true":"false" ));