public static bool Exists()
{
uint deviceListCount = 0;
uint rawInputDeviceListSize = (uint)Marshal.SizeOf <RAWINPUTDEVICELIST>();
if (GetRawInputDeviceList(
null,
ref deviceListCount,
rawInputDeviceListSize) != 0)
{
return(false);
}
var devices = new RAWINPUTDEVICELIST[deviceListCount];
if (GetRawInputDeviceList(
devices,
ref deviceListCount,
rawInputDeviceListSize) != deviceListCount)
{
return(false);
}
foreach (var device in devices.Where(x => x.dwType == RIM_TYPEHID))
{
uint deviceInfoSize = 0;
if (GetRawInputDeviceInfo(
device.hDevice,
RIDI_DEVICEINFO,
IntPtr.Zero,
ref deviceInfoSize) != 0)
{
continue;
}
var deviceInfo = new RID_DEVICE_INFO {
cbSize = deviceInfoSize
};
if (GetRawInputDeviceInfo(
device.hDevice,
RIDI_DEVICEINFO,
ref deviceInfo,
ref deviceInfoSize) == unchecked ((uint)-1))
{
continue;
}
if ((deviceInfo.hid.usUsagePage == TouchpadUsagePage) &&
(deviceInfo.hid.usUsage == TouchpadUsage))
{
return(true);
}
}
return(false);
}
private static RAWINPUTDEVICELIST[] EnumerateDevices(RawInputDeviceType ty)
{
RAWINPUTDEVICELIST[] retVal = null;
uint count = 0;
int res = Function.GetRawInputDeviceList(retVal, ref count, (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICELIST)));
retVal = new RAWINPUTDEVICELIST[count];
res = Function.GetRawInputDeviceList(retVal, ref count, (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICELIST)));
return(retVal.Where(x => x.dwType == ty).ToArray());
}
private IEnumerable <RAWINPUTDEVICELIST> GetRawInputDevices(uint type)
{
uint deviceCount = 0;
uint dwSize = (uint)Marshal.SizeOf(typeof(RAWINPUTDEVICELIST));
uint retValue = GetRawInputDeviceList(null, ref deviceCount, dwSize);
if (0 != retValue)
{
return(null);
}
RAWINPUTDEVICELIST[] deviceList = new RAWINPUTDEVICELIST[deviceCount];
retValue = GetRawInputDeviceList(deviceList, ref deviceCount, dwSize);
return(deviceList.Where(ridl => ridl.dwType == type));
}