BarcodeScanner.GetDefaultAsync Method
Definition
Important
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Returns the first available barcode scanner.
public:
static IAsyncOperation<BarcodeScanner ^> ^ GetDefaultAsync();/// [Windows.Foundation.Metadata.RemoteAsync]
static IAsyncOperation<BarcodeScanner> GetDefaultAsync();[Windows.Foundation.Metadata.RemoteAsync]
public static IAsyncOperation<BarcodeScanner> GetDefaultAsync();function getDefaultAsync()Public Shared Function GetDefaultAsync () As IAsyncOperation(Of BarcodeScanner)Returns
The first available barcode scanner. Returns a null object in the following cases:
- A device is not found.
- Access denied to the existing device. The user can deny access to a device, which is not treated as an exception.
- Attributes
Examples
// Creates the barcode scanner.
task<void> Scenario1::CreateDefaultScannerObject()
{
return create_task(BarcodeScanner::GetDefaultAsync()).then([this] (BarcodeScanner^ _scanner)
{
this->scanner = _scanner;
if (this->scanner != nullptr)
{
// UpdateOutput("Barcode Scanner created.");
// UpdateOutput("Device Id is:" + this->scanner->DeviceId);
}
else
{
// UpdateOutput("Barcode scanner not found. Connect a barcode scanner.");
}
});
}
//Creates a barcode scanner.
private async Task<bool> CreateDefaultScannerObject()
{
if (scanner == null)
{
scanner = await BarcodeScanner.GetDefaultAsync();
if (scanner != null)
{
// UpdateOutput("Default Barcode Scanner created.");
// UpdateOutput("Device Id is:" + scanner.DeviceId);
}
else
{
// UpdateOutput("Barcode Scanner not found. Please connect a Barcode Scanner.");
return false;
}
}
return true;
}