Source code for haskeyboard.cs

```
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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```
```
 
```
```
namespace RobvanderWoude
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```
{
```
```
	internal class HasKeyboard
```
```
	{
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		static readonly string progver = "1.00";

```
 
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		static int Main( string[] args )
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		{
```
```
			bool usbkeyboards = true;
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```
			bool otherkeyboards = true;
```
```
			bool quietmode = false;
```
```
 
```
```
 
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			#region Parse Command Line
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```
 
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			foreach ( string arg in args )
```
```
			{
```
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				switch ( arg.ToUpper( ) )
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				{
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					case "/?":
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						return ShowHelp( );
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					case "/O":
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					case "/OTHER":
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						if ( !usbkeyboards )
```
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						{
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							return ShowHelp( "Duplicate command line switch /OTHER" );

```
						}
```
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						usbkeyboards = false;
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```
						break;
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					case "/Q":
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```
					case "/QUIET":
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```
						if ( quietmode )
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						{
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							return ShowHelp( "Duplicate command line switch /QUIET" );

```
						}
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```
						quietmode = true;
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						break;
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					case "/U":
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```
					case "/USB":
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```
						if ( !otherkeyboards )
```
```
						{
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							return ShowHelp( "Duplicate command line switch /USB" );

```
						}
```
```
						otherkeyboards = false;
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						break;
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```
					default:
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						return ShowHelp( "Invalid command line argument \"{0}\"", arg );

```
				}
```

				if ( !otherkeyboards && !usbkeyboards )

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				{
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					return ShowHelp( "Command line switches /USB and /OTHER are mutually exclusive" );

```
				}
```
```
			}
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```
 
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			#endregion Parse Command Line
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```
```
 
```

			#region Enumerate and Count Raw Keyboard Devices

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```

			var rawDeviceEnumerator = new RawInputDeviceEnumerator( );

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			int count = -1;
```

			if ( otherkeyboards && usbkeyboards )

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			{
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				count = rawDeviceEnumerator.AllKeyboardsCount;

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				if ( !quietmode )
```
```
				{
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					Console.WriteLine( "Total keyboards count: {0}", count );

```
				}
```
```
			}
```
```
			else if ( usbkeyboards )
```
```
			{
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				count = rawDeviceEnumerator.UsbKeyboardsCount;

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				if ( !quietmode )
```
```
				{
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					Console.WriteLine( "USB keyboards count: {0}", count );

```
				}
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```
			}
```
```
			else if ( otherkeyboards )
```
```
			{
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				count = rawDeviceEnumerator.OtherKeyboardsCount;

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				if ( !quietmode )
```
```
				{
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					Console.WriteLine( "Other (non-USB) keyboards count: {0}", count );

```
				}
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			}
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```
 
```

			#endregion Enumerate and Count Raw Keyboard Devices

```
 
```
```
 
```
```
			return count;
```
```
		}
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```
 
```
```
 
```

		public static int ShowHelp( params string[] errmsg )

```
		{
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			#region Error Message
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```
 
```
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			if ( errmsg.Length > 0 )
```
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			{
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				List<string> errargs = new List<string>( errmsg );

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				errargs.RemoveAt( 0 );
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				Console.Error.WriteLine( );
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				Console.ForegroundColor = ConsoleColor.Red;

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				Console.Error.Write( "ERROR:\t" );
```

				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );

```
				Console.ResetColor( );
```
```
			}
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```
 
```
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			#endregion Error Message
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```
 
```
```
 
```
```
			#region Help Text
```
```
 
```
```
			/*
```
```
			HasKeyboard.exe,  Version 1.00
```

			Count number of keyboards available at this very moment

```
 
```

			Usage:   HasKeyboard.exe  [ /USB | /OTHER ]  [ /Q ]

```
 
```

			Where:   /USB          count USB keyboards only (default: all keybords)

			         /OTHER        count OTHER (non-USB) keyboards only (default: all)

			         /QUIET        QUIET mode (no screen output)

```
 
```

			Notes:   By default this program counts ALL keybord types.

			         Switches may be abbreviated to /U, /O and/or /Q.

			         The program's return code equals the number of keyboards of the

			         specified type detected, or -1 in case of (command line) errors.

```
 
```

			Credits: Based on C# wrapper for GetRawInputDeviceList by Pavel Pachobut

			         https://github.com/PashaPash/RawInput/

```
 
```
```
			Written by Rob van der Woude
```
```
			https://www.robvanderwoude.com
```
```
			*/
```
```
 
```
```
			#endregion Help Text
```
```
 
```
```
 
```
```
			#region Display Help Text
```
```
 
```
```
			Console.Error.WriteLine( );
```
```
 
```

			Console.Error.WriteLine( "HasKeyboard.exe,  Version {0}", progver );

```
 
```

			Console.Error.WriteLine( "Count number of keyboards available at this very moment" );

```
 
```
```
			Console.Error.WriteLine( );
```
```
 
```
```
			Console.Error.Write( "Usage:   " );
```

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "HasKeyboard.exe  [ /USB | /OTHER ]  [ /Q ]" );

```
			Console.ResetColor( );
```
```
 
```
```
			Console.Error.WriteLine( );
```
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```
```
			Console.Error.Write( "Where:   " );
```

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "/USB" );
```
```
			Console.ResetColor( );
```

			Console.Error.Write( "          count " );

			Console.ForegroundColor = ConsoleColor.White;

```
			Console.Error.Write( "USB" );
```
```
			Console.ResetColor( );
```

			Console.Error.WriteLine( " keyboards only (default: all keybords)" );

```
 
```

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "         /OTHER" );

```
			Console.ResetColor( );
```

			Console.Error.Write( "        count " );

			Console.ForegroundColor = ConsoleColor.White;

```
			Console.Error.Write( "OTHER" );
```
```
			Console.ResetColor( );
```

			Console.Error.WriteLine( " (non-USB) keyboards only (default: all)" );

```
 
```

			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "         /QUIET        QUIET" );

```
			Console.ResetColor( );
```

			Console.Error.WriteLine( " mode (no screen output)" );

```
 
```
```
			Console.Error.WriteLine( );
```
```
 
```

			Console.Error.Write( "Notes:   By default this program counts " );

			Console.ForegroundColor = ConsoleColor.White;

```
			Console.Error.Write( "ALL" );
```
```
			Console.ResetColor( );
```

			Console.Error.WriteLine( " keybord types." );

```
 
```

			Console.Error.Write( "         Switches may be abbreviated to " );

			Console.ForegroundColor = ConsoleColor.White;

```
			Console.Error.Write( "/U" );
```
```
			Console.ResetColor( );
```
```
			Console.Error.Write( ", " );
```

			Console.ForegroundColor = ConsoleColor.White;

```
			Console.Error.Write( "/O" );
```
```
			Console.ResetColor( );
```
```
			Console.Error.Write( " and/or " );
```

			Console.ForegroundColor = ConsoleColor.White;

```
			Console.Error.Write( "/Q" );
```
```
			Console.ResetColor( );
```
```
			Console.Error.WriteLine( "." );
```
```
 
```

			Console.Error.WriteLine( "         The program's return code equals the number of keyboards of the" );

```
 
```

			Console.Error.WriteLine( "         specified type detected, or -1 in case of (command line) errors." );

```
 
```
```
			Console.Error.WriteLine( );
```
```
 
```

			Console.Error.WriteLine( "Credits: Based on C# wrapper for GetRawInputDeviceList by Pavel Pachobut" );

```
 
```

			Console.ForegroundColor = ConsoleColor.DarkGray;

			Console.Error.WriteLine( "         https://github.com/PashaPash/RawInput/" );

```
			Console.ResetColor( );
```
```
 
```
```
			Console.Error.WriteLine( );
```
```
 
```

			Console.Error.WriteLine( "Written by Rob van der Woude" );

```
 
```

			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

```
 
```
```
			#endregion Display Help Text
```
```
 
```
```
 
```
```
			return -1;
```
```
		}
```
```
	}
```
```
 
```
```
 
```

	// The following code is copied from Pavel Pachobut's C# wrapper for

	// GetRawInputDeviceList: https://github.com/PashaPash/RawInput/

	// and modified by Rob van der Woude (added AllKeyboardsCount and

	// OtherKeyboardsCount properties to RawInputDeviceEnumerator class)

```
	public class RawInputDevice
```
```
	{
```

		private readonly Win32.RawInputDeviceList _rawInputDeviceList;

```
		private readonly string _deviceName;
```

		private readonly Win32.DeviceInfo _deviceInfo;

```
 
```
```
		public IntPtr DeviceHandle
```
```
		{
```
```
			get
```
```
			{
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				return _rawInputDeviceList.DeviceHandle;

```
			}
```
```
		}
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```
 
```

		public Win32.RawInputDeviceType DeviceType

```
		{
```
```
			get
```
```
			{
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				return _rawInputDeviceList.DeviceType;

```
			}
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```
		}
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```
```
		public string DeviceName
```
```
		{
```
```
			get
```
```
			{
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```
				return this._deviceName;
```
```
			}
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```
		}
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		public Win32.DeviceInfo DeviceInfo
```
```
		{
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```
			get
```
```
			{
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```
				return this._deviceInfo;
```
```
			}
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```
		}
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```

		public RawInputDevice( Win32.RawInputDeviceList rawInputDeviceList )

```
		{
```

			this._rawInputDeviceList = rawInputDeviceList;

```
 
```

			_deviceName = GetDeviceName( this._rawInputDeviceList.DeviceHandle );

```
 
```

			_deviceInfo = GetDeviceInfo( this._rawInputDeviceList.DeviceHandle );

```
		}
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```

		private static IntPtr GetDeviceData( IntPtr deviceHandle, Win32.RawInputDeviceInfoCommand command )

```
		{
```
```
			uint dataSize = 0;
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```
			var ptrData = IntPtr.Zero;
```
```
 
```

			Win32.GetRawInputDeviceInfo( deviceHandle, command, ptrData, ref dataSize );

```
 
```
```
			if ( dataSize == 0 )
```
```
			{
```
```
				return IntPtr.Zero;
```
```
			}
```
```
 
```

			ptrData = Marshal.AllocHGlobal( (int)dataSize );

```
 
```

			var result = Win32.GetRawInputDeviceInfo( deviceHandle, command, ptrData, ref dataSize );

```
 
```
```
			if ( result == 0 )
```
```
			{
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				Marshal.FreeHGlobal( ptrData );
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```
				return IntPtr.Zero;
```
```
			}
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```
			return ptrData;
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		}
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		private static string GetDeviceName( IntPtr deviceHandle )

```
		{
```

			var ptrDeviceName = GetDeviceData( deviceHandle, Win32.RawInputDeviceInfoCommand.DeviceName );

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```
```
			if ( ptrDeviceName == IntPtr.Zero )
```
```
			{
```
```
				return string.Empty;
```
```
			}
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```

			var deviceName = Marshal.PtrToStringAnsi( ptrDeviceName );

			Marshal.FreeHGlobal( ptrDeviceName );

```
			return deviceName;
```
```
		}
```
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```

		private static Win32.DeviceInfo GetDeviceInfo( IntPtr deviceHandle )

```
		{
```

			var ptrDeviceInfo = GetDeviceData( deviceHandle, Win32.RawInputDeviceInfoCommand.DeviceInfo );

```
 
```
```
			if ( ptrDeviceInfo == IntPtr.Zero )
```
```
			{
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```
				return new Win32.DeviceInfo( );
```
```
			}
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```

			var deviceInfo = (Win32.DeviceInfo)Marshal.PtrToStructure( ptrDeviceInfo, typeof( Win32.DeviceInfo ) );

```
 
```

			Marshal.FreeHGlobal( ptrDeviceInfo );

```
			return deviceInfo;
```
```
		}
```
```
	}
```
```
 
```
```
 
```
```
	public class RawInputDeviceEnumerator
```
```
	{
```

		private readonly RawInputDevice[] _devices;

```
 
```

		public IEnumerable<RawInputDevice> Devices

```
		{
```
```
			get
```
```
			{
```
```
				return this._devices;
```
```
			}
```
```
		}
```
```
 
```
```
		public RawInputDeviceEnumerator( )
```
```
		{
```
```
			uint deviceCount = 0;
```

			var deviceSize = (uint)Marshal.SizeOf( typeof( Win32.RawInputDeviceList ) );

```
 
```

			// first call retrieves the number of raw input devices

			var result = Win32.GetRawInputDeviceList( IntPtr.Zero, ref deviceCount, deviceSize );

```
 
```

			_devices = new RawInputDevice[deviceCount];

```
 
```

			if ( (int)result == -1 || deviceCount == 0 )

```
			{
```
```
				// call failed, or no devices found
```
```
				return;
```
```
			}
```
```
 
```

			// allocates memory for an array of Win32.RawInputDeviceList

			IntPtr ptrDeviceList = Marshal.AllocHGlobal( (int)( deviceSize * deviceCount ) );

```
 
```

			result = Win32.GetRawInputDeviceList( ptrDeviceList, ref deviceCount, deviceSize );

```
 
```
```
			if ( (int)result != -1 )
```
```
			{
```

				// enumerates array of Win32.RawInputDeviceList,

				// and populates array of managed RawInputDevice objects

				for ( var index = 0; index < deviceCount; index++ )

```
				{
```

					var rawInputDeviceList = (Win32.RawInputDeviceList)Marshal.PtrToStructure( new IntPtr( ( ptrDeviceList.ToInt32( ) + ( deviceSize * index ) ) ), typeof( Win32.RawInputDeviceList ) );

```
 
```

					_devices[index] = new RawInputDevice( rawInputDeviceList );

```
				}
```
```
			}
```
```
 
```

			Marshal.FreeHGlobal( ptrDeviceList );

```
		}
```
```
 
```
```
 
```
```
		public int AllKeyboardsCount
```
```
		{
```
```
			get
```
```
			{
```

				return this.Devices.Count( d => d.DeviceType == Win32.RawInputDeviceType.Keyboard );

```
			}
```
```
		}
```
```
 
```
```
 
```
```
		public int OtherKeyboardsCount
```
```
		{
```
```
			get
```
```
			{
```

				return this.Devices.Count( d => d.DeviceType == Win32.RawInputDeviceType.Keyboard && !d.DeviceInfo.KeyboardInfo.IsUSBKeboard );

```
			}
```
```
		}
```
```
 
```
```
 
```
```
		public int UsbKeyboardsCount
```
```
		{
```
```
			get
```
```
			{
```

				return this.Devices.Count( d => d.DeviceType == Win32.RawInputDeviceType.Keyboard && d.DeviceInfo.KeyboardInfo.IsUSBKeboard );

```
			}
```
```
		}
```
```
	}
```
```
 
```
```
 
```
```
	public static class Win32
```
```
	{
```
```
		public enum RawInputDeviceType : uint
```
```
		{
```
```
			Mouse = 0,
```
```
			Keyboard = 1,
```
```
			HumanInterfaceDevice = 2
```
```
		}
```
```
 
```

		public enum RawInputDeviceInfoCommand : uint

```
		{
```
```
			PreparsedData = 0x20000005,
```
```
			DeviceName = 0x20000007,
```
```
			DeviceInfo = 0x2000000b,
```
```
		}
```
```
 
```
```
		[StructLayout( LayoutKind.Explicit )]
```
```
		public struct DeviceInfo
```
```
		{
```
```
			[FieldOffset( 0 )]
```
```
			public int Size;
```
```
			[FieldOffset( 4 )]
```
```
			public int Type;
```
```
			[FieldOffset( 8 )]
```
```
			public DeviceInfoMouse MouseInfo;
```
```
			[FieldOffset( 8 )]
```

			public DeviceInfoKeyboard KeyboardInfo;

```
			[FieldOffset( 8 )]
```
```
			public DeviceInfoHID HIDInfo;
```
```
		}
```
```
 
```
```
		public struct DeviceInfoMouse
```
```
		{
```
```
			public uint ID;
```
```
			public uint NumberOfButtons;
```
```
			public uint SampleRate;
```
```
		}
```
```
 
```
```
		public struct DeviceInfoKeyboard
```
```
		{
```
```
			public uint Type;
```
```
			public uint SubType;
```
```
			public uint KeyboardMode;
```
```
			public uint NumberOfFunctionKeys;
```
```
			public uint NumberOfIndicators;
```
```
			public uint NumberOfKeysTotal;
```
```
			public bool IsUSBKeboard
```
```
			{
```
```
				get
```
```
				{
```

					return this.Type == 81; // http://msdn.microsoft.com/en-us/library/windows/desktop/ms724336%28v=vs.85%29.aspx

```
				}
```
```
			}
```
```
		}
```
```
 
```
```
		public struct DeviceInfoHID
```
```
		{
```
```
			public uint VendorID;
```
```
			public uint ProductID;
```
```
			public uint VersionNumber;
```
```
			public ushort UsagePage;
```
```
			public ushort Usage;
```
```
		}
```
```
 
```

		[StructLayout( LayoutKind.Sequential )]

```
		public struct RawInputDeviceList
```
```
		{
```
```
			public IntPtr DeviceHandle;
```

			public RawInputDeviceType DeviceType;

```
		}
```
```
 
```

		[DllImport( "User32.dll", SetLastError = true )]

		public static extern uint GetRawInputDeviceList( IntPtr pRawInputDeviceList, ref uint uiNumDevices, uint cbSize );

```
 
```

		[DllImport( "user32.dll", SetLastError = true )]

		public static extern uint GetRawInputDeviceInfo( IntPtr hDevice, RawInputDeviceInfoCommand uiCommand, IntPtr data, ref uint size );

```
	}
```
```
}
```