Associate .binlog and .buildlog files with the MSBuild Structured Log…

… Viewer.

Fixes #64

src/StructuredLogViewer/FileAssociations.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Diagnostics;
+using Microsoft.Win32;
+
+namespace StructuredLogViewer
+{
+    public class FileAssociation
+    {
+        public string Extension { get; set; }
+        public string ProgId { get; set; }
+        public string FileTypeDescription { get; set; }
+        public string ExecutableFilePath { get; set; }
+    }
+
+    public class FileAssociations
+    {
+        // needed so that Explorer windows get refreshed after the registry is updated
+        [System.Runtime.InteropServices.DllImport("Shell32.dll")]
+        private static extern int SHChangeNotify(int eventId, int flags, IntPtr item1, IntPtr item2);
+
+        private const int SHCNE_ASSOCCHANGED = 0x8000000;
+        private const int SHCNF_FLUSH = 0x1000;
+
+        public static void EnsureAssociationsSet()
+        {
+            var filePath = Process.GetCurrentProcess().MainModule.FileName;
+            EnsureAssociationsSet(
+                new FileAssociation
+                {
+                    Extension = ".binlog",
+                    ProgId = "MSBuildBinaryLog",
+                    FileTypeDescription = "MSBuild Binary Log",
+                    ExecutableFilePath = filePath
+                },
+                new FileAssociation
+                {
+                    Extension = ".buildlog",
+                    ProgId = "MSBuildStructuredLog",
+                    FileTypeDescription = "MSBuild Structured Log",
+                    ExecutableFilePath = filePath
+                });
+        }
+
+        public static void EnsureAssociationsSet(params FileAssociation[] associations)
+        {
+            bool madeChanges = false;
+            foreach (var association in associations)
+            {
+                madeChanges |= SetAssociation(
+                    association.Extension,
+                    association.ProgId,
+                    association.FileTypeDescription,
+                    association.ExecutableFilePath);
+            }
+
+            if (madeChanges)
+            {
+                SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_FLUSH, IntPtr.Zero, IntPtr.Zero);
+            }
+        }
+
+        public static bool SetAssociation(string extension, string progId, string fileTypeDescription, string applicationFilePath)
+        {
+            bool madeChanges = false;
+            madeChanges |= SetKeyDefaultValue(@"Software\Classes\" + extension, progId);
+            madeChanges |= SetKeyDefaultValue(@"Software\Classes\" + progId, fileTypeDescription);
+            madeChanges |= SetKeyDefaultValue($@"Software\Classes\{progId}\shell\open\command", "\"" + applicationFilePath + "\" \"%1\"");
+            return madeChanges;
+        }
+
+        private static bool SetKeyDefaultValue(string keyPath, string value)
+        {
+            using (var key = Registry.CurrentUser.CreateSubKey(keyPath))
+            {
+                if (key.GetValue(null) as string != value)
+                {
+                    key.SetValue(null, value);
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}

src/StructuredLogViewer/MainWindow.xaml.cs

@@ -89,6 +89,7 @@ private async void MainWindow_Loaded(object sender, RoutedEventArgs e)
                     if (result == null || result.Version == currentVersion)
                     {
                         message = "You have the latest version: " + currentVersion.ToString();
+                        FileAssociations.EnsureAssociationsSet();
                     }
                     else if (result.Version > currentVersion)
                     {

src/StructuredLogViewer/StructuredLogViewer.csproj

@@ -83,6 +83,7 @@
     <Compile Include="Controls\TreeViewExtensions.cs" />
     <Compile Include="Entrypoint.cs" />
     <Compile Include="ExceptionHandler.cs" />
+    <Compile Include="FileAssociations.cs" />
     <Compile Include="HighlightedText.cs" />
     <Compile Include="HostedBuild.cs" />
     <Compile Include="MainWindow.xaml.cs">