public async Task ScanAsync(CancellationToken token)
{
if (!_isConnected)
{
throw new InvalidOperationException("Not connected to MQTT.");
}
Log?.Invoke(this, new LogArgs("Scanning..."));
_mqttClient.UseApplicationMessageReceivedHandler(e =>
{
var args = new ScanResultArgs(Encoding.UTF8.GetString(e.ApplicationMessage.Payload));
ScanResultFound?.Invoke(this, args);
});
await _mqttClient.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic("locomotives/discovery").Build());
while (!token.IsCancellationRequested && _isConnected)
{
await Task.Delay(10);
}
Log?.Invoke(this, new LogArgs("Disconnecting..."));
await _mqttClient.DisconnectAsync();
}
public async void StartScanning()
{
_scanner = new MobileBarcodeScanner();
ScanStatusChanged?.Invoke(this, new ScanStatusEventArgs {
ScanStatus = "Starting Scan"
});
var result = await _scanner.Scan();
if (result != null)
{
ScanStatusChanged?.Invoke(this, new ScanStatusEventArgs {
ScanStatus = "Scan Result Received"
});
ScanResultFound?.Invoke(this, new ScanResultEventArgs {
ScannedText = result.Text
});
}
else
{
ScanStatusChanged?.Invoke(this, new ScanStatusEventArgs {
ScanStatus = "Scan Cancelled"
});
}
}
void ReceivedScanData(object sender, Scanner.DataEventArgs e)
{
if (e.P0 != null && e.P0.Result == ScannerResults.Success)
{
var resultData = e.P0.GetScanData();
var firstResult = resultData.FirstOrDefault();
if (firstResult != null)
{
ScanResultFound?.Invoke(sender, new ScanResultEventArgs {
ScannedText = firstResult.Data
});
}
StopScanning();
}
}
