From 96efc06ba93143050899add57556037d65b44573 Mon Sep 17 00:00:00 2001
From: Chris Kaczor <chris@kaczorzoo.net>
Date: Mon, 2 Mar 2026 18:01:06 -0500
Subject: [PATCH] Send identify message with a timeout

---
 Library/WindowManager.cs | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Library/WindowManager.cs b/Library/WindowManager.cs
index 8199c44..d807679 100644
--- a/Library/WindowManager.cs
+++ b/Library/WindowManager.cs
@@ -15,6 +15,16 @@ public static partial class WindowManager
         Allow = 1
     }
 
+    [Flags]
+    private enum SendMessageTimeoutFlags : uint
+    {
+        Normal = 0x0,
+        Block = 0x1,
+        AbortIfHung = 0x2,
+        NoTimeoutIfNotHung = 0x8,
+        ErrorOnExit = 0x20
+    }
+
     [LibraryImport("user32.dll")]
     [return: MarshalAs(UnmanagedType.Bool)]
     private static partial void EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
@@ -31,6 +41,17 @@ public static partial class WindowManager
     [LibraryImport("user32.dll", EntryPoint = "SendMessageW", SetLastError = true)]
     private static partial IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);
 
+    [LibraryImport("user32.dll", EntryPoint = "SendMessageTimeoutW", SetLastError = true)]
+    private static partial IntPtr SendMessageTimeout(
+        IntPtr windowHandle,
+        int msg,
+        IntPtr wParam,
+        IntPtr lParam,
+        SendMessageTimeoutFlags flags,
+        uint timeout,
+        out IntPtr result);
+
+
     [LibraryImport("user32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
     private static partial void ChangeWindowMessageFilterEx(IntPtr hWnd, int msg, ChangeWindowMessageFilterExAction action, IntPtr changeInfo);
@@ -101,7 +122,7 @@ public static partial class WindowManager
         if (hWnd == _excludeHandle)
             return true;
 
-        var identifyResult = SendMessage(hWnd, IdentifyMessage, IntPtr.Zero, IntPtr.Zero);
+        SendMessageTimeout(hWnd, IdentifyMessage, IntPtr.Zero, IntPtr.Zero, SendMessageTimeoutFlags.Normal, 100, out var identifyResult);
 
         if (identifyResult == IdentifyMessage)
         {