private HidSharp.HidStream GetStream()
{
if (!IsOpen || stream == null)
{
stream = internalDevice.Open();
}
return(stream);
}
/// <summary>
/// Create a 64-byte messenger object bound to a USB HID device.
/// </summary>
/// <param name="vid">Vendor ID</param>
/// <param name="pid">Product ID</param>
/// <param name="serialnumber">Serial number</param>
/// <param name="timeoutms">Time in milliseconds to wait for
/// read and write operations to complete. Zero means wait
/// forever.</param>
public Messenger(int vid = IO.Devices.USB.Munts.HID.Vendor,
int pid = IO.Devices.USB.Munts.HID.Product,
string serialnumber = null, int timeoutms = 1000)
{
// Validate parameters
if (timeoutms < 0)
{
throw new Exception("Invalid timeout");
}
if ((vid < 0) || (vid > 65535))
{
throw new Exception("Invalid vendor ID");
}
if ((pid < 0) || (pid > 65535))
{
throw new Exception("Invalid product ID");
}
if (System.IO.File.Exists("/usr/lib/libsimpleio.so") ||
System.IO.File.Exists("/usr/local/lib/libsimpleio.so"))
{
// Use libsimpleio libHIDRaw
this.transport = Transport.libsimpleio;
// Open the raw HID device
int error;
libHIDRaw.HIDRAW_open3(vid, pid, serialnumber, out this.fd,
out error);
if (error != 0)
{
throw new Exception("Cannot open USB device");
}
}
else
{
// Use HidSharp library
this.transport = Transport.HidSharp;
try
{
// Open the USB HID device
HidSharp.DeviceList list = HidSharp.DeviceList.Local;
if (!list.TryGetHidDevice(out hid_device, vid, pid, null,
serialnumber))
{
throw new Exception("DeviceList.TryGetHidDevice() failed");
}
hid_stream = hid_device.Open();
hid_stream.ReadTimeout = timeoutms;
hid_stream.WriteTimeout = timeoutms;
}
catch (System.Exception e)
{
throw new Exception("Cannot open USB HID device, " + e.Message);
}
}
this.timeout = timeoutms;
}
