Add new methods to EasyOpenVRSingleton.cs (#8)

* Add new methods to EasyOpenVRSingleton.cs

* undo autoformat

Author: Antoni-Czaplicki

EasyOpenVRSingleton.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.ComponentModel;
@@ -298,6 +298,11 @@ public InputOriginInfo_t GetOriginTrackedDeviceInfo(ulong originHandle) {
             DebugLog(error);
             return info;
         }
+
+        public EDeviceActivityLevel GetTrackedDeviceActivityLevel(uint index)
+        {
+            return OpenVR.System.GetTrackedDeviceActivityLevel(index);
+        }
         #endregion
 
         #region events
@@ -1144,12 +1149,30 @@ public bool AddApplicationManifest(string relativeManifestPath, string applicati
         public string GetRunningApplicationId()
         {
             var pid = OpenVR.Applications.GetCurrentSceneProcessId();
+            if (pid == 0)
+            {
+                return string.Empty;
+            }
             var sb = new StringBuilder((int)OpenVR.k_unMaxApplicationKeyLength);
             var error = OpenVR.Applications.GetApplicationKeyByProcessId(pid, sb, OpenVR.k_unMaxApplicationKeyLength);
             DebugLog(error);
             return sb.ToString();
         }
 
+        public string GetApplicationPropertyString(string applicationKey, EVRApplicationProperty applicationProperty)
+        {
+            if (string.IsNullOrEmpty(applicationKey))
+            {
+                return String.Empty;
+            }
+            var error = new EVRApplicationError();
+            var sbLenght = (int)OpenVR.Applications.GetApplicationPropertyString(applicationKey, applicationProperty, null, 0, ref error);
+            var sb = new StringBuilder(sbLenght);
+            OpenVR.Applications.GetApplicationPropertyString(applicationKey, applicationProperty, sb, (uint)sbLenght, ref error);
+            DebugLog(error);
+            return sb.ToString();
+        }
+
         public string GetRuntimeVersion()
         {
             var version = "N/A";