private static bool HasTabletDevices()
{
uint deviceCount = 0;
// Determine the number of devices first (result will be -1 if fails and cDevices will have count)
int result = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(null, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (result >= 0 && deviceCount != 0)
{
NativeMethods.RAWINPUTDEVICELIST[] ridl = new NativeMethods.RAWINPUTDEVICELIST[deviceCount];
int count = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(ridl, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (count > 0)
{
for (int i = 0; i < count; i++)
{
if (ridl[i].dwType == NativeMethods.RIM_TYPEHID)
{
NativeMethods.RID_DEVICE_INFO deviceInfo = new NativeMethods.RID_DEVICE_INFO();
deviceInfo.cbSize = (uint)Marshal.SizeOf(typeof(NativeMethods.RID_DEVICE_INFO));
uint cbSize = (uint)deviceInfo.cbSize;
int cBytes = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceInfo(ridl[i].hDevice, NativeMethods.RIDI_DEVICEINFO, ref deviceInfo, ref cbSize);
if (cBytes > 0)
{
if (deviceInfo.hid.usUsagePage == NativeMethods.HID_USAGE_PAGE_DIGITIZER)
{
switch (deviceInfo.hid.usUsage)
{
case NativeMethods.HID_USAGE_DIGITIZER_DIGITIZER:
case NativeMethods.HID_USAGE_DIGITIZER_PEN:
case NativeMethods.HID_USAGE_DIGITIZER_TOUCHSCREEN:
case NativeMethods.HID_USAGE_DIGITIZER_LIGHTPEN:
{
return(true);
}
}
}
}
else
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceInfo failed!");
}
}
}
}
else if (count < 0)
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceList failed!");
}
}
return(false);
}
private static bool HasTabletDevices()
{
uint deviceCount = 0;
// Determine the number of devices first (result will be -1 if fails and cDevices will have count)
int result = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(null, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (result >= 0 && deviceCount != 0)
{
NativeMethods.RAWINPUTDEVICELIST[] ridl = new NativeMethods.RAWINPUTDEVICELIST[deviceCount];
int count = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(ridl, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (count > 0)
{
for (int i = 0; i < count; i++)
{
if (ridl[i].dwType == NativeMethods.RIM_TYPEHID)
{
NativeMethods.RID_DEVICE_INFO deviceInfo = new NativeMethods.RID_DEVICE_INFO();
deviceInfo.cbSize = (uint)Marshal.SizeOf(typeof(NativeMethods.RID_DEVICE_INFO));
uint cbSize = (uint)deviceInfo.cbSize;
int cBytes = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceInfo(ridl[i].hDevice, NativeMethods.RIDI_DEVICEINFO, ref deviceInfo, ref cbSize);
if (cBytes > 0)
{
if (deviceInfo.hid.usUsagePage == NativeMethods.HID_USAGE_PAGE_DIGITIZER)
{
switch (deviceInfo.hid.usUsage)
{
case NativeMethods.HID_USAGE_DIGITIZER_DIGITIZER:
case NativeMethods.HID_USAGE_DIGITIZER_PEN:
case NativeMethods.HID_USAGE_DIGITIZER_TOUCHSCREEN:
case NativeMethods.HID_USAGE_DIGITIZER_LIGHTPEN:
{
return true;
}
}
}
}
else
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceInfo failed!");
}
}
}
}
else if (count < 0)
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceList failed!");
}
}
return false;
}
