public static List <HidInfo> Browse()
{
Guid gHid;
List <HidInfo> info = new List <HidInfo>();
// Obtain hid guid
Native.HidD_GetHidGuid(out gHid);
// Get list of present hid devices
var hInfoSet = Native.SetupDiGetClassDevs(ref gHid, null, IntPtr.Zero, Native.DIGCF_DEVICEINTERFACE | Native.DIGCF_PRESENT);
// Allocate mem for interface descriptor
var iface = new Native.DeviceInterfaceData();
// Set size field
iface.Size = Marshal.SizeOf(iface);
// Interface index
uint index = 0;
// iterate through all interfaces
while (Native.SetupDiEnumDeviceInterfaces(hInfoSet, 0, ref gHid, index, ref iface))
{
short vid, pid;
var path = GetPath(hInfoSet, ref iface);
var handle = Open(path);
if (handle != Native.INVALID_HANDLE_VALUE)
{
var man = GetManufacturer(handle);
var prod = GetProduct(handle);
var serial = GetSerialNumber(handle);
GetVidPid(handle, out vid, out pid);
var cap = GetDeviceCapabilities(handle);
HidInfo i = new HidInfo(prod, serial, man, path, vid, pid, cap);
info.Add(i);
Close(handle);
}
index++;
}
// Clean up
if (Native.SetupDiDestroyDeviceInfoList(hInfoSet) == false)
{
throw new Win32Exception();
}
return(info);
}
public bool Open(HidInfo hidInfo)
{
Close();
SafeFileHandle shandle;
// Open HID device file
handle = Native.CreateFile(hidInfo.Path,
Native.GENERIC_READ | Native.GENERIC_WRITE,
Native.FILE_SHARE_READ | Native.FILE_SHARE_WRITE,
IntPtr.Zero, Native.OPEN_EXISTING, Native.FILE_FLAG_OVERLAPPED,
IntPtr.Zero);
// Return failure if handle is invalid
if (handle == Native.INVALID_HANDLE_VALUE)
{
return(false);
}
// Open safe file handle
shandle = new SafeFileHandle(handle, false);
// Prepare stream - async
fileStream = new FileStream(shandle, FileAccess.ReadWrite, 32, true);
// Start asyncronous receive task
receiveQueue = new BlockingCollection <byte[]>(1000);
if (receiveTask != null)
{
if (!receiveTask.IsCompleted)
{
throw new Exception("Task already running");
}
}
receiveTask = new Task(() => ReceiveTask(receiveQueue), TaskCreationOptions.LongRunning);
receiveTask.Start();
hidDeviceState = HidDeviceState.Open;
// Return success
return(true);
}