[c#]snippet for access system key map

KeyMap.cs

// access key maps
using Microsoft.Win32;

class KeyMap {
  static void Main(string[] args) {
    // Windows7 does not support Keyboard Layout in CurrentUser
    //var root = Registry.CurrentUser;
    //var subkey = @"Keyboard Layout"; // for CurrentUser
    var root = Registry.LocalMachine;
    var subkey = @"SYSTEM\CurrentControlSet\Control\Keyboard Layout";
    
    using (var regkey = root.OpenSubKey(subkey)) {
      // Scancode Map is REG_BINARY
      var maps = regkey.GetValue("Scancode Map") as byte[];
      // scancode map spec
      // dword1 : 0x0000-0000 : 1st dword always 0
      // dword2 : 0x0000-0000 : 2nd dword always 0
      // dword3 : 0x0000-0002 : 3rd dword is mapping count + 1 (data size)
      // dword4 : 0x003a-e01d : Caps Lock(003a) -> RCtrl(e01d)
      // dword5 : 0x0000-0000 : last dword always 0
      for (var i = 0; i < maps.Length; i += 4) {
        uint dw = System.BitConverter.ToUInt32(maps, i);
        System.Console.WriteLine("dword: 0x{0:x4}-{1:x4}", dw >> 16, dw & 0xffff);
      }
    }
  }
}