BarcodeScanner.ClaimScannerAsync Metode
Definisi
Penting
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Mencoba untuk mendapatkan akses eksklusif ke pemindai kode batang.
public:
virtual IAsyncOperation<ClaimedBarcodeScanner ^> ^ ClaimScannerAsync() = ClaimScannerAsync;/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncOperation<ClaimedBarcodeScanner> ClaimScannerAsync();[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncOperation<ClaimedBarcodeScanner> ClaimScannerAsync();function claimScannerAsync()Public Function ClaimScannerAsync () As IAsyncOperation(Of ClaimedBarcodeScanner)Mengembalikan
Ketika metode selesai, metode mengembalikan ClaimedBarcodeScanner.
- Atribut
Contoh
// Claims the barcode scanner for exclusive use
task<void> Scenario1::ClaimScanner()
{
return create_task(scanner->ClaimScannerAsync()).then([this] (ClaimedBarcodeScanner^ _claimedScanner)
{
this->claimedScanner = _claimedScanner;
if (claimedScanner != nullptr)
{
// UpdateOutput("Barcode scanner claimed successfully.");
}
else
{
// UpdateOutput("Failed to claim barcode scanner.");
}
});
}
// Claims the barcode scanner for exclusive use.
private async Task<bool> ClaimScanner()
{
if (claimedScanner == null)
{
claimedScanner = await scanner.ClaimScannerAsync();
if (claimedScanner != null)
{
// UpdateOutput("Barcode scanner claimed successfully.");
}
else
{
// UpdateOutput("Failed to claim the barcode scanner.");
return false;
}
}
return true;
}