Shows GameSparks API key in Unity window title (Windows)

GameSparksHelper.cs

#if UNITY_EDITOR_WIN
using UnityEngine;
using System.Runtime.InteropServices;
using System.Text;
using UnityEditor;
using System;

namespace GameSparks.Editor
{
	[InitializeOnLoad]
	public static class GameSparksHelper
	{
		const string GS_SETTINGS_PATH = "Path/To/Your/GS/Settings";

		[DllImport( "user32.dll" )]
		private static extern IntPtr GetForegroundWindow ();

		[DllImport( "user32.dll" )]
		private static extern int GetWindowTextLength (IntPtr hWnd);

		[DllImport( "user32.dll" )]
		private static extern int GetWindowText (IntPtr hWnd, StringBuilder lpString, int nMaxCount);

		[DllImport( "user32.dll" )]
		private static extern bool SetWindowText (IntPtr hWnd, string lpString);

		private static string currentScene;

		static GameSparksHelper () {
			currentScene = EditorApplication.currentScene;
			EditorApplication.hierarchyWindowChanged += UpdateWindowTitle;
		}

		private static void UpdateWindowTitle () {
			if (currentScene != EditorApplication.currentScene || EditorApplication.isPlayingOrWillChangePlaymode) {
				currentScene = EditorApplication.currentScene;
				var gsSettingsInstance = AssetDatabase.LoadAssetAtPath<GameSparksSettings>( GS_SETTINGS_PATH );
				var fieldInfo = gsSettingsInstance.GetType().GetField( "apiKey", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance );
				string apiKey = (string)fieldInfo.GetValue( gsSettingsInstance );

				if (string.IsNullOrEmpty( apiKey )) {
					apiKey = "None";
				}
				DisplayGSApiKey( apiKey );
			}
		}

		public static void DisplayGSApiKey (string apiKey) {
			string title = GetWindowText();

			if (title.Contains( "GS Stage:" )) {
				int index = title.IndexOf( "  -  GS Stage:" );
				title = title.Remove( index, title.Length - index );
			}

			title += string.Format( "  -  GS Stage: {0}", apiKey );
			if (title.Contains( "Unity" )) {
				SetWindowText( title );
			}
		}

		private static string GetWindowText () {
			IntPtr hWnd = GetForegroundWindow();
			int length = GetWindowTextLength( hWnd );
			StringBuilder text = new StringBuilder( length + 1 );
			GetWindowText( hWnd, text, text.Capacity );
			return text.ToString();
		}

		private static void SetWindowText (string text) {
			IntPtr hWnd = GetForegroundWindow();
			SetWindowText( hWnd, text );
		}
	}
}
#endif