private static bool GetDeviceCaps(Device stick, byte[] preparsed_data, out HidProtocolCaps caps)
{
// Query joystick capabilities
caps = new HidProtocolCaps();
if (HidProtocol.GetCaps(preparsed_data, ref caps) != HidProtocolStatus.Success)
{
Debug.Print("[WinRawJoystick] HidProtocol.GetCaps() failed with {0}",
Marshal.GetLastWin32Error());
return(false);
}
// Make sure our caps arrays are big enough
HidProtocolValueCaps[] axis_caps = new HidProtocolValueCaps[caps.NumberInputValueCaps];
HidProtocolButtonCaps[] button_caps = new HidProtocolButtonCaps[caps.NumberInputButtonCaps];
// Axis capabilities
ushort axis_count = (ushort)axis_caps.Length;
if (HidProtocol.GetValueCaps(HidProtocolReportType.Input,
axis_caps, ref axis_count, preparsed_data) !=
HidProtocolStatus.Success)
{
Debug.Print("[WinRawJoystick] HidProtocol.GetValueCaps() failed with {0}",
Marshal.GetLastWin32Error());
return(false);
}
// Button capabilities
ushort button_count = (ushort)button_caps.Length;
if (HidProtocol.GetButtonCaps(HidProtocolReportType.Input,
button_caps, ref button_count, preparsed_data) !=
HidProtocolStatus.Success)
{
Debug.Print("[WinRawJoystick] HidProtocol.GetButtonCaps() failed with {0}",
Marshal.GetLastWin32Error());
return(false);
}
stick.AxisCaps.Clear();
stick.AxisCaps.AddRange(axis_caps);
stick.ButtonCaps.Clear();
stick.ButtonCaps.AddRange(button_caps);
return(true);
}
private HatPosition GetHatPosition(uint value, HidProtocolValueCaps caps)
{
if (value > caps.LogicalMax)
{
//Return zero if our value is out of bounds ==> e.g.
//Thrustmaster T-Flight Hotas X returns 15 for the centered position
return(HatPosition.Centered);
}
if (caps.LogicalMax == 3)
{
//4-way hat switch as per the example in Appendix C
//http://www.usb.org/developers/hidpage/Hut1_12v2.pdf
switch (value)
{
case 0:
return(HatPosition.Left);
case 1:
return(HatPosition.Up);
case 2:
return(HatPosition.Right);
case 3:
return(HatPosition.Down);
}
}
if (caps.LogicalMax == 8)
{
//Hat states are represented as a plain number from 0-8
//with centered being zero
//Padding should have already been stripped out, so just cast
return((HatPosition)value);
}
if (caps.LogicalMax == 7)
{
//Hat states are represented as a plain number from 0-7
//with centered being 8
value++;
value %= 9;
return((HatPosition)value);
}
//The HID report length is unsupported
return(HatPosition.Centered);
}