Show warning when HTML template file could not be loaded on startup.

fix #33

Author: topeterk

Sources/AppConfig.cs

@@ -1,6 +1,6 @@
 //MIT License
 
-//Copyright (c) 2016-2024 Peter Kirmeier
+//Copyright (c) 2016-2025 Peter Kirmeier
 
 //Permission is hereby granted, free of charge, to any person obtaining a copy
 //of this software and associated documentation files (the "Software"), to deal
@@ -435,6 +435,8 @@ private void LoadSettings()
             if (_settings.Succession.SuccessionList.Count <= _settings.Succession.ActiveIndex) _settings.Succession.ActiveIndex = 0;
             profCtrl.InitializeProfilesControl(_settings.Profiles, _settings.Succession);
             profCtrl.om.Settings = _settings;
+            if (!profCtrl.om.ReloadTemplate())
+                MessageBox.Show("The file " + (string.IsNullOrEmpty(_settings.Inputfile) ? "<Inputfile not set>" : "\"" + _settings.Inputfile + "\"") + " not found!", "Error loading template!");
             profCtrl.om.Update(); // Write first output once after application start
 
             // Configure hot keys..

Sources/OutModule.cs

@@ -1,6 +1,6 @@
 //MIT License
 
-//Copyright (c) 2016-2024 Peter Kirmeier
+//Copyright (c) 2016-2025 Peter Kirmeier
 
 //Permission is hereby granted, free of charge, to any person obtaining a copy
 //of this software and associated documentation files (the "Software"), to deal
@@ -68,11 +68,7 @@ public OM_Severity Severity
         public SettingsRoot Settings
         {
             get { return _settings; }
-            set
-            {
-                _settings = value;
-                ReloadTemplate();
-            }
+            set { _settings = value; }
         }
 
         #endregion
@@ -90,15 +86,16 @@ public OutModule(ProfilesControl ProfilesControl)
         /// Refreshes the file handles.
         /// Call when _settings.Inputfile changes!
         /// </summary>
-        public void ReloadTemplate()
+        public bool ReloadTemplate()
         {
             // Reload input file handle when possible
-            if (File.Exists(_settings.Inputfile))
-            {
-                StreamReader sr = new (_settings.Inputfile);
-                template = sr.ReadToEnd();
-                sr.Close();
-            }
+            if (!File.Exists(_settings.Inputfile))
+                return false;
+
+            StreamReader sr = new (_settings.Inputfile);
+            template = sr.ReadToEnd();
+            sr.Close();
+            return true;
         }
 
         #region JSON helpers
@@ -175,8 +172,7 @@ public void Update()
             if (null == _settings.OutputFile) return;
             if (null == template) // no valid template read yet?
             {
-                ReloadTemplate(); // try to read template again
-                if (null == template) return; // still invalid, avoid writing empty output file
+                if (!ReloadTemplate()) return; // try to read template again. on error, avoid writing empty output file
             }
 
             if (IsUpdateRunning) return; // Prevent multiple outputs at the same time (not thread safe, only works on same thread!)