Make `<delayedAutoStart>`/`<beeponshutdown>`/`<interactive>` a boolean

samples/sample-complete.xml

@@ -180,7 +180,7 @@ SECTION: Service management
       Enables the Delayed Automatic Start if 'Automatic' is specified in the 'startmode' field.
       See the WinSW documentation to get info about supported platform versions and limitations.
     -->
-    <!--<delayedAutoStart/>-->
+    <!--<delayedAutoStart>true</delayedAutoStart>-->
     
     <!-- 
       OPTION: depend
@@ -196,7 +196,7 @@ SECTION: Service management
       Indicates the service can interactwith the desktop.
     -->
     <!--
-    <interactive/>
+    <interactive>true</interactive>
     -->
     
 <!-- 
@@ -281,7 +281,7 @@ SECTION: Other options
     Indicates the service should beep when finished on shutdown (if it's supported by OS).
   -->
   <!--
-  <beeponshutdown/> 
+  <beeponshutdown>true</beeponshutdown>
   -->
   
 <!--

src/WinSW.Core/Native/ServiceApis.cs

@@ -31,6 +31,9 @@ namespace WinSW.Native
         [DllImport(Libraries.Advapi32, SetLastError = true, CharSet = CharSet.Unicode, EntryPoint = "ChangeServiceConfig2W")]
         internal static extern bool ChangeServiceConfig2(IntPtr serviceHandle, ServiceConfigInfoLevels infoLevel, in SERVICE_DELAYED_AUTO_START_INFO info);
 
+        [DllImport(Libraries.Advapi32, SetLastError = true, CharSet = CharSet.Unicode, EntryPoint = "ChangeServiceConfig2W")]
+        internal static extern bool ChangeServiceConfig2(IntPtr serviceHandle, ServiceConfigInfoLevels infoLevel, in SERVICE_PRESHUTDOWN_INFO info);
+
         [DllImport(Libraries.Advapi32)]
         internal static extern bool CloseServiceHandle(IntPtr objectHandle);
 
@@ -164,6 +167,11 @@ namespace WinSW.Native
             public unsafe SC_ACTION* Actions;
         }
 
+        internal struct SERVICE_PRESHUTDOWN_INFO
+        {
+            public int PreshutdownTimeout;
+        }
+
         internal struct SERVICE_STATUS
         {
             public ServiceType ServiceType;

src/WinSW.Core/ServiceDescriptor.cs

@@ -572,18 +572,18 @@ namespace WinSW
         /// True if the service should be installed with the DelayedAutoStart flag.
         /// This setting will be applyed only during the install command and only when the Automatic start mode is configured.
         /// </summary>
-        public bool DelayedAutoStart => this.dom.SelectSingleNode("//delayedAutoStart") != null;
+        public bool DelayedAutoStart => this.SingleBoolElement("delayedAutoStart", Defaults.DelayedAutoStart);
 
         /// <summary>
         /// True if the service should beep when finished on shutdown.
         /// This doesn't work on some OSes. See http://msdn.microsoft.com/en-us/library/ms679277%28VS.85%29.aspx
         /// </summary>
-        public bool BeepOnShutdown => this.dom.SelectSingleNode("//beeponshutdown") != null;
+        public bool BeepOnShutdown => this.SingleBoolElement("beeponshutdown", Defaults.DelayedAutoStart);
 
         /// <summary>
         /// True if the service can interact with the desktop.
         /// </summary>
-        public bool Interactive => this.dom.SelectSingleNode("//interactive") != null;
+        public bool Interactive => this.SingleBoolElement("interactive", Defaults.DelayedAutoStart);
 
         /// <summary>
         /// Environment variable overrides

src/WinSW.Tests/Util/ConfigXmlBuilder.cs

@@ -171,7 +171,7 @@ namespace WinSW.Tests.Util
 
         public ConfigXmlBuilder WithDelayedAutoStart()
         {
-            return this.WithRawEntry("<delayedAutoStart/>");
+            return this.WithRawEntry("<delayedAutoStart>true</delayedAutoStart>");
         }
     }
 }