static extern private int ohmd_device_getf(IntPtr device, ohmd_float_value val, IntPtr out_value);
public static extern int ohmd_device_setf(IntPtr device, ohmd_float_value val, IntPtr in_value);
/// <summary>
/// Gets float information from a device.
/// </summary>
/// <param name="device">The opened device you want information from.</param>
/// <param name="arrayLength">Length of the array information you want.</param>
/// <param name="informationType">Enum value for what kind of information is needed.</param>
/// <returns>Returns an array of floats where the length is defined by arrayLength which is requested.</returns>
public float[] getFloatInformation(Device device, int arrayLength, ohmd_float_value informationType)
{
if (!openedDevices.ContainsKey(device.Index))
{
throw new DeviceNotOpenedException(String.Format("Device with index {0} and name {1} is not yet openend. Please open first.", device.Index, device.Product));
}
IntPtr hmd = openedDevices[device.Index];
float[] result = new float[arrayLength];
//Allocate the result memory, otherwise memory gets corrupted on read / write.
var gch = GCHandle.Alloc(result, GCHandleType.Pinned);
IntPtr f = gch.AddrOfPinnedObject();
//Get the actual value.
ohmd_device_getf(hmd, informationType, f);
//Copy the returned IntPtr to the result array.
Marshal.Copy(f, result, 0, arrayLength);
//Free the memory.
gch.Free();
return result;
}