private void ReadAsync(IAsyncResult asyncResult)
{
if (asyncResult != null)
{
state = (DeviceReadState)asyncResult.AsyncState;
//FileStream deviceStream = state.DeviceStream;
try
{
state.DeviceStream.EndRead(asyncResult);
}
catch (IOException)
{
state.DeviceStream.Close();
return;
}
catch (InvalidOperationException)
{
// fStream.Close();
//if (!shouldStop) MessageBox.Show("EndRead failed...InvalidOperationEx!");
}
}
if (!shouldStop)
{
try
{
asyncResult = state.DeviceStream.BeginRead(
state.ReadArray, 0, state.ReadArray.Length,
new AsyncCallback(ReadAsync), state);
}
catch
{
shouldStop = true;
}
if (asyncResult != null)
{
byte[] report = state.ReadArray;//new byte[state.ReadArray.Length];
/*
for (int i = 0; i < state.ReadArray.Length; i++)
{
report[i] = state.ReadArray[i];
}
*/
receivedReport.Invoke(report);
}
}
}
private void InitializeFileStream()
{
if (dev.OpenDeviceForIoctl())
{
using (HidPreparsedData preparsedData = new HidPreparsedData(dev.Handle))
{
NativeApi.HIDP_CAPS Capabilities = new NativeApi.HIDP_CAPS();
NativeApi.HidP_GetCaps(preparsedData.Handle, ref Capabilities);
bufferSize = Capabilities.InputReportByteLength;
}
if (dev.OpenDeviceForRead())
{
state = new DeviceReadState(new FileStream(dev.Handle, FileAccess.Read), new byte[bufferSize]);
}
else
{
throw new Exception("Unable to open device for Read");
}
}
}
