/// <summary>
/// Retrieving the raw input data struct when a WM_INPUT message has arrived
/// For Mouse and keyboard we can directly fill the RawInput struct
/// For HID we need to get RawHeader and RawHid separatly because RawHid is not constant size
/// </summary>
/// <param name="LParam">LParam parameter from WindowLoop during WM_INPUT message</param>
/// <returns></returns>
private bool GetRawInputData(IntPtr LParam)
{
uint HeaderSize = (uint)Marshal.SizeOf(typeof(RawInputHeader));
uint dwSize = 0;
uint size = (uint)_RawInputHeader.dwSize;
Win32API.GetRawInputData(LParam, RawInputUiCommand.RID_INPUT, IntPtr.Zero, ref dwSize, (uint)Marshal.SizeOf(typeof(RawInputHeader)));
uint result;
if (_dwType == RawInputDeviceType.RIM_TYPEHID)
{
IntPtr p = Marshal.AllocHGlobal((int)size);
result = Win32API.GetRawInputData(LParam, RawInputUiCommand.RID_INPUT, p, ref size, HeaderSize);
if (result != 0xFFFF && result == size)
{
_RawHidData = RawHid.FromIntPtr((IntPtr)((int)p + HeaderSize));
Marshal.FreeHGlobal(p);
return(true);
}
}
else if (_dwType == RawInputDeviceType.RIM_TYPEMOUSE)
{
result = Win32API.GetRawInputData(LParam, RawInputUiCommand.RID_INPUT, out _RawInputDataMouse, ref size, (uint)Marshal.SizeOf(typeof(RawInputHeader)));
if (result != 0xFFFF && result == size)
{
return(true);
}
else
{
return(false);
}
}
else if (_dwType == RawInputDeviceType.RIM_TYPEKEYBOARD)
{
//TODO
return(false);
}
return(false);
}
/// <summary>
/// The bRawData array is variable in lenght, and using GetDeviceInfo we can get a pointer to some RawInput structure
/// containing the RawInputHeader + RawHID structures.
/// This functions will parse bytes from the pointer to fill a struct with a fixed size byte array as bRawData
/// </summary>
/// <param name="Ptr">Pointer to RAWINPUT struct obtained with a call GetRawInputDeviceInfo</param>
/// <returns>RawHid struct filled with data</returns>
public static RawHid FromIntPtr(IntPtr Ptr)
{
RawHid result = new RawHid();
//Bytes 0-3 = dwSizeHid
//Bytes 4-7 = dwCount
byte[] buffer = new byte[8];
Marshal.Copy(Ptr, buffer, 0, 8);
result.dwSizeHid = BitConverter.ToInt32(buffer, 0);
result.dwCount = BitConverter.ToInt32(buffer, 4);
//Creating a fixed size byte array
result.bRawData = new byte[result.dwCount * result.dwSizeHid];
try
{
Marshal.Copy((IntPtr)((int)Ptr + 8), result.bRawData, 0, result.bRawData.Length);
return(result);
}
catch
{
return(result);
}
}
