Added check for xinput1_3, exiting the application if not found.

XInputBatteryMeter/Program.cs

@@ -1,5 +1,7 @@
 using System;
+using System.Runtime.InteropServices;
 using System.Windows.Forms;
+using XInputBatteryMeter.Properties;
 
 namespace XInputBatteryMeter
 {
@@ -9,12 +11,47 @@ public static void Main()
         {
             Console.WriteLine(@"Initializing.");
 
-            var poller = new BatteryStatusPoller();
+            var xinput13 = IsLibraryInstalled("xinput1_3.dll");
+            //var xinput910 = IsLibraryInstalled("xinput9_1_0.dll");
 
-            Application.EnableVisualStyles();
-            Application.SetCompatibleTextRenderingDefault(false);
-            Application.Run(new BatteryMeterApplicationContext(poller));
+            if (!xinput13)
+            {
+                MessageBox.Show(Resources.XInputNotFoundText, Resources.XInputNotFoundCaption, MessageBoxButtons.OK,
+                    MessageBoxIcon.Error);
+            }
+            else
+            {
+                var poller = new BatteryStatusPoller();
 
+                Application.EnableVisualStyles();
+                Application.SetCompatibleTextRenderingDefault(false);
+                Application.Run(new BatteryMeterApplicationContext(poller));
+            }
+
+        }
+
+        /// <summary>
+        /// Loads the specified module into the address space of the calling process. The specified module may cause other modules to be loaded.
+        /// </summary>
+        /// <param name="lpFileName">
+        /// <para>The name of the module. This can be either a library module (a .dll file) or an executable module (an .exe file).</para>
+        /// </param>
+        /// <returns>
+        /// <para>If the function succeeds, the return value is a handle to the module.</para>
+        /// <para>If the function fails, the return value is NULL.</para>
+        /// </returns>
+        [DllImport("kernel32", SetLastError = true)]
+        private static extern IntPtr LoadLibrary(string lpFileName);
+
+        /// <summary>
+        /// Checks if the specified Library is installed.
+        /// </summary>
+        /// <param name="fileName">The file to search for. This can be either a library module (a .dll file) or an executable module (an .exe file).</param>
+        /// <returns>true if the library is found; otherwise false.</returns>
+        private static bool IsLibraryInstalled(string fileName)
+        {
+            return LoadLibrary(fileName) != IntPtr.Zero;
         }
+
     }
 }

XInputBatteryMeter/Properties/Resources.resx

@@ -237,4 +237,10 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
   <data name="VersionString" xml:space="preserve">
     <value>Version </value>
   </data>
+  <data name="XInputNotFoundCaption" xml:space="preserve">
+    <value>XInput Not Found</value>
+  </data>
+  <data name="XInputNotFoundText" xml:space="preserve">
+    <value>XInput was not detected on this system. Please ensure you have the latest version of DirectX installed and try again. The application will now close.</value>
+  </data>
 </root>