CurrentWindowService: macOS: macos now detects the active window

YMouseButtonControl.Services.MacOS/CurrentWindowService.cs

@@ -1,8 +1,121 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
 using YMouseButtonControl.Core.Processes;
+using CFIndex = long;
 
 namespace YMouseButtonControl.Services.MacOS;
 
 public class CurrentWindowService : ICurrentWindowService
 {
-    public string ForegroundWindow { get; private set; } = string.Empty;
+    public string ForegroundWindow => GetForegroundWindow();
+
+    private string GetForegroundWindow()
+    {
+        var nsWorkspace = objc_getClass("NSWorkspace");
+        var sharedWorkspace = objc_msgSend_retIntPtr(nsWorkspace, GetSelector("sharedWorkspace"));
+        var frontmostApplication = objc_msgSend_retIntPtr(
+            sharedWorkspace,
+            GetSelector("frontmostApplication")
+        );
+        var localizedName = objc_msgSend_retIntPtr(
+            frontmostApplication,
+            GetSelector("localizedName")
+        );
+        return GetStrFromCFString(localizedName);
+    }
+
+    private const string AppKitFramework = "/System/Library/Frameworks/AppKit.framework/AppKit";
+    private const string FoundationFramework =
+        "/System/Library/Frameworks/Foundation.framework/Foundation";
+    private const string CoreFoundation =
+        "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation";
+
+    [DllImport(AppKitFramework, CharSet = CharSet.Ansi)]
+    public static extern IntPtr objc_getClass(string name);
+
+    [DllImport(FoundationFramework, EntryPoint = "objc_msgSend")]
+    public static extern IntPtr objc_msgSend_retIntPtr(IntPtr target, IntPtr selector);
+
+    public static IntPtr GetSelector(string name)
+    {
+        IntPtr cfstrSelector = CreateCFString(name);
+        IntPtr selector = NSSelectorFromString(cfstrSelector);
+        CFRelease(cfstrSelector);
+        return selector;
+    }
+
+    [DllImport(CoreFoundation)]
+    static extern CFIndex CFStringGetLength(nint theString);
+
+    [DllImport(CoreFoundation)]
+    static extern void CFStringGetCharacters(nint theString, CFRange range, nint buffer);
+
+    private static unsafe string GetStrFromCFString(nint ptr)
+    {
+        var length = CFStringGetLength(ptr);
+        var u = CFStringGetCharactersPtr(ptr);
+        var buffer = IntPtr.Zero;
+        if (u == IntPtr.Zero)
+        {
+            var range = new CFRange(0, length);
+            buffer = Marshal.AllocCoTaskMem((int)(length * 2));
+            CFStringGetCharacters(ptr, range, buffer);
+            u = buffer;
+        }
+
+        var str = new string((char*)u, 0, (int)length);
+        if (buffer != IntPtr.Zero)
+            Marshal.FreeCoTaskMem(buffer);
+        return str;
+    }
+
+    [DllImport(FoundationFramework)]
+    public static extern void CFRelease(IntPtr handle);
+
+    [DllImport(CoreFoundation)]
+    static extern nint CFStringGetCharactersPtr(nint theString);
+
+    [DllImport(AppKitFramework)]
+    public static extern IntPtr NSSelectorFromString(IntPtr cfstr);
+
+    public static unsafe IntPtr CreateCFString(string aString)
+    {
+        var bytes = Encoding.Unicode.GetBytes(aString);
+        fixed (byte* b = bytes)
+        {
+            var cfStr = CFStringCreateWithBytes(
+                IntPtr.Zero,
+                (IntPtr)b,
+                bytes.Length,
+                CFStringEncoding.UTF16,
+                false
+            );
+            return cfStr;
+        }
+    }
+
+    [DllImport(FoundationFramework)]
+    public static extern IntPtr CFStringCreateWithBytes(
+        IntPtr allocator,
+        IntPtr buffer,
+        long bufferLength,
+        CFStringEncoding encoding,
+        bool isExternalRepresentation
+    );
+
+    public enum CFStringEncoding : uint
+    {
+        UTF16 = 0x0100,
+        UTF16BE = 0x10000100,
+        UTF16LE = 0x14000100,
+        ASCII = 0x0600
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    struct CFRange(CFIndex length, CFIndex location)
+    {
+        public CFIndex Length = length;
+        public CFIndex Location = location;
+    }
 }

YMouseButtonControl.Services.MacOS/YMouseButtonControl.Services.MacOS.csproj

@@ -4,6 +4,7 @@
         <TargetFramework>net8.0</TargetFramework>
         <LangVersion>latest</LangVersion>
         <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     </PropertyGroup>
 
     <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">