Detect the Hardware Type

This content originally appeared in: http://snippets.dzone.com/user/zachgris

// make sure to add a 'using System.Runtime.InteropServices;' line to your file
public class DeviceHardware
{
	public const string HardwareProperty = "hw.machine";

	public enum HardwareVersion {
	    iPhone,
	    iPhone3G,
	    iPhone3GS,
	    iPhone4,
	    iPod1G,
	    iPod2G,
	    iPod3G,
	    iPod4G,
	    iPad,
	    iPhoneSimulator,
	    iPhone4Simulator,
	    iPadSimulator,
	    Unknown
	}

        // Changing the constant to "/usr/bin/libSystem.dylib" allows this P/Invoke to work on Mac OS X
        // Using "hw.model" as property gives Macintosh model, "hw.machine" kernel arch (ppc, ppc64, i386, x86_64)
        [DllImport(MonoTouch.Constants.SystemLibrary)]
        internal static extern int sysctlbyname( [MarshalAs(UnmanagedType.LPStr)] string property, // name of the property
	                                        IntPtr output, // output
	                                        IntPtr oldLen, // IntPtr.Zero
	                                        IntPtr newp, // IntPtr.Zero
	                                        uint newlen // 0
	                                       );

	public static HardwareVersion Version
	{
		get
		{
			// get the length of the string that will be returned
			var pLen = Marshal.AllocHGlobal(sizeof(int));
			sysctlbyname(DeviceHardware.HardwareProperty, IntPtr.Zero, pLen, IntPtr.Zero, 0);

			var length = Marshal.ReadInt32(pLen);

			// check to see if we got a length
			if (length == 0)
			{
				Marshal.FreeHGlobal(pLen);
				return HardwareVersion.Unknown;
			}

			// get the hardware string
			var pStr = Marshal.AllocHGlobal(length);
			sysctlbyname(DeviceHardware.HardwareProperty, pStr, pLen, IntPtr.Zero, 0);

			// convert the native string into a C# string
			var hardwareStr = Marshal.PtrToStringAnsi(pStr);
			var ret = HardwareVersion.Unknown;

			// determine which hardware we are running
			if (hardwareStr == "iPhone1,1")
                            ret = HardwareVersion.iPhone;
			else if (hardwareStr == "iPhone1,2")
			    ret = HardwareVersion.iPhone3G;
			else if (hardwareStr == "iPhone2,1")
			    ret = HardwareVersion.iPhone3GS;
			else if (hardwareStr == "iPhone3,1")
			    ret = HardwareVersion.iPhone4;
			else if (hardwareStr == "iPad1,1")
			    ret = HardwareVersion.iPad;
			else if (hardwareStr == "iPod1,1")
			    ret = HardwareVersion.iPod1G;
			else if (hardwareStr == "iPod2,1")
			    ret = HardwareVersion.iPod2G;
			else if (hardwareStr == "iPod3,1")
			    ret = HardwareVersion.iPod3G;
			else if (hardwareStr == "iPod4,1")
			    ret = HardwareVersion.iPod3G;
			else if (hardwareStr == "i386" || hardwareStr == "x86_64") {
			    if (UIDevice.CurrentDevice.Model.Contains("iPhone"))
			        ret = UIScreen.MainScreen.Bounds.Height * UIScreen.MainScreen.Scale == 960 || UIScreen.MainScreen.Bounds.Width * UIScreen.MainScreen.Scale == 960 ? HardwareVersion.iPhone4Simulator : HardwareVersion.iPhoneSimulator;
		            else
			        ret = HardwareVersion.iPadSimulator;
			}
			else ret = HardwareVersion.Unknown;

			// cleanup
			Marshal.FreeHGlobal(pLen);
			Marshal.FreeHGlobal(pStr);

			return ret;
		}
	}
}