v0.4: mic tray icon from mmres.dll, version in form title

2026-08-10 12:39:33 +00:00
parent fbbb52df90
commit 08d6eeb46e
3 changed files with 80 additions and 5 deletions
@@ -0,0 +1,56 @@
+using System.Runtime.InteropServices;
+
+namespace Robovoice.App;
+
+internal static class IconExtractor
+{
+    private const string Source = @"%SystemRoot%\System32\mmres.dll";
+    private static readonly int[] CandidateIndices = { 5, 12 };
+
+    public static Icon? TryExtractMicrophone(int size = 32)
+    {
+        string path = Environment.ExpandEnvironmentVariables(Source);
+        if (!File.Exists(path)) return null;
+
+        foreach (int index in CandidateIndices)
+        {
+            if (ExtractIconAt(path, index, size, size) is { } icon)
+                return icon;
+        }
+        return null;
+    }
+
+    private static Icon? ExtractIconAt(string path, int index, int width, int height)
+    {
+        IntPtr[] hicons = new IntPtr[1];
+        IntPtr[] ids = new IntPtr[1];
+
+        int count = PrivateExtractIcons(path, index, width, height, hicons, ids, 1, 0);
+        if (count <= 0 || hicons[0] == IntPtr.Zero) return null;
+
+        try
+        {
+            return Icon.FromHandle(hicons[0]);
+        }
+        catch
+        {
+            DestroyIcon(hicons[0]);
+            return null;
+        }
+    }
+
+    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+    private static extern int PrivateExtractIcons(
+        string lpszFile,
+        int nIconIndex,
+        int cxIcon,
+        int cyIcon,
+        IntPtr[] phicon,
+        IntPtr[] phiconId,
+        int nIcons,
+        int flags);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool DestroyIcon(IntPtr hIcon);
+}