ClaimedBarcodeScanner.DataReceived Event
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Occurs when the device scans a barcode.
// Register
event_token DataReceived(TypedEventHandler<ClaimedBarcodeScanner, BarcodeScannerDataReceivedEventArgs const&> const& handler) const;
// Revoke with event_token
void DataReceived(event_token const* cookie) const;
// Revoke with event_revoker
ClaimedBarcodeScanner::DataReceived_revoker DataReceived(auto_revoke_t, TypedEventHandler<ClaimedBarcodeScanner, BarcodeScannerDataReceivedEventArgs const&> const& handler) const;
public event TypedEventHandler<ClaimedBarcodeScanner,BarcodeScannerDataReceivedEventArgs> DataReceived;
function onDataReceived(eventArgs) { /* Your code */ }
claimedBarcodeScanner.addEventListener("datareceived", onDataReceived);
claimedBarcodeScanner.removeEventListener("datareceived", onDataReceived);
- or -
claimedBarcodeScanner.ondatareceived = onDataReceived;
Public Custom Event DataReceived As TypedEventHandler(Of ClaimedBarcodeScanner, BarcodeScannerDataReceivedEventArgs)
Event Type
Examples
The following example shows how to setup the barcode scanner to receive data after a scanning event.
void Scenario1::ScenarioStartScanButton_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
// Create the barcode scanner.
create_task(CreateDefaultScannerObject()).then([this](void)
{
if (scanner != nullptr)
{
// Claim the scanner for exclusive use by your application.
create_task(ClaimScanner()).then([this](void)
{
if (claimedScanner)
{
// Add a release device requested event handler. If this event is not handled,
// another app can claim the barcode scanner.
releaseDeviceRequestedToken = claimedScanner->ReleaseDeviceRequested::add(ref new EventHandler<ClaimedBarcodeScanner^>(this, &Scenario1::OnReleaseDeviceRequested));
/// Add a data receive event handler.
dataReceivedToken = claimedScanner->DataReceived::add(ref new TypedEventHandler<ClaimedBarcodeScanner^, BarcodeScannerDataReceivedEventArgs^>(this, &Scenario1::OnDataReceived));
UpdateOutput("Attached the DataReceived Event handler.");
// Set the app to decode the raw data from the barcode scanner
claimedScanner->IsDecodeDataEnabled = true;
// Enable the scanner.
create_task(EnableScanner()).then([this](void)
{
UpdateOutput("Ready to Scan.");
// Reset the button state
ScenarioEndScanButton->IsEnabled = true;
ScenarioStartScanButton->IsEnabled = false;
});
}
});
}
});
}
private async void ScenarioStartScanButton_Click(object sender, RoutedEventArgs e)
{
// Create the barcode scanner.
if (await CreateDefaultScannerObject())
{
// Claim the scanner for exclusive use by your application.
if (await ClaimScanner())
{
// Add a release device requested event handler. If this event is not handled,
// another app can claim the barcode scanner.
claimedScanner.ReleaseDeviceRequested += claimedScanner_ReleaseDeviceRequested;
// Add a data receive event handler.
claimedScanner.DataReceived += claimedScanner_DataReceived;
UpdateOutput("Attached the DataReceived Event handler.");
// Set the app to decode the raw data from the barcode scanner
claimedScanner.IsDecodeDataEnabled = true;
// Enable the scanner.
if (await EnableScanner())
{
// Reset the button state
ScenarioEndScanButton.IsEnabled = true;
ScenarioStartScanButton.IsEnabled = false;
UpdateOutput("Ready to Scan.");
}
}
}
else
{
UpdateOutput("No Barcode Scanner found");
}
}
void Scenario1::OnDataReceived(Windows::Devices::PointOfService::ClaimedBarcodeScanner ^sender, Windows::Devices::PointOfService::BarcodeScannerDataReceivedEventArgs ^args)
{
// read the data from the buffer and convert to string.
Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler(
[this,args]()
{
DataReader^ scanDataLabelReader = DataReader::FromBuffer(args->Report->ScanDataLabel);
ScenarioOutputScanDataLabel->Text = scanDataLabelReader->ReadString(args->Report->ScanDataLabel->Length);
DataReader^ scanDataReader = DataReader::FromBuffer(args->Report->ScanData);
ScenarioOutputScanData->Text = scanDataReader->ReadString(args->Report->ScanData->Length);
ScenarioOutputScanDataType->Text = BarcodeSymbologies::GetName(args->Report->ScanDataType);
}));
}
async void claimedScanner_DataReceived(ClaimedBarcodeScanner sender, BarcodeScannerDataReceivedEventArgs args)
{
// update the UI with the data received from the scan.
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
// read the data from the buffer and convert to string.
var scanDataLabelReader = DataReader.FromBuffer(args.Report.ScanDataLabel);
ScenarioOutputScanDataLabel.Text = scanDataLabelReader.ReadString(args.Report.ScanDataLabel.Length);
var scanDataReader = DataReader.FromBuffer(args.Report.ScanData);
ScenarioOutputScanData.Text = scanDataReader.ReadString(args.Report.ScanData.Length);
ScenarioOutputScanDataType.Text = BarcodeSymbologies.GetName(args.Report.ScanDataType);
});
}