From a01763cbe790cf9834e609e89e0826935e36d0b8 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 16 Dec 2006 14:38:44 +0000
Subject: [PATCH] (w32-window-exists-p): New function. (syms_of_w32fns):
 Defsubr it.

---
 src/w32fns.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/w32fns.c b/src/w32fns.c
index 96fa9375ee8..34cfb0a2882 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -8349,6 +8349,30 @@ is set to off if the low bit of NEW-STATE is zero, otherwise on.  */)
     }
   return Qnil;
 }
+
+DEFUN ("w32-window-exists-p", Fw32_window_exists_p, Sw32_window_exists_p,
+       2, 2, 0,
+       doc: /* Return non-nil if a window exists with the specified CLASS and NAME.
+
+This is a direct interface to the Windows API FindWindow function.  */)
+  (class, name)
+Lisp_Object class, name;
+{
+  HWND hnd;
+
+  if (!NILP (class))
+    CHECK_STRING (class);
+  if (!NILP (name))
+    CHECK_STRING (name);
+
+  hnd = FindWindow (STRINGP (class) ? ((LPCTSTR) SDATA (class)) : NULL,
+		    STRINGP (name)  ? ((LPCTSTR) SDATA (name))  : NULL);
+  if (!hnd)
+    return Qnil;
+  return Qt;
+}
+
+
 
 DEFUN ("file-system-info", Ffile_system_info, Sfile_system_info, 1, 1, 0,
        doc: /* Return storage information about the file system FILENAME is on.
@@ -8915,6 +8939,7 @@ versions of Windows) characters.  */);
 
     staticpro (&Qw32_charset_unicode);
     Qw32_charset_unicode = intern ("w32-charset-unicode");
+  }
 #endif
 
 #if 0 /* TODO: Port to W32 */
@@ -8959,6 +8984,7 @@ versions of Windows) characters.  */);
   defsubr (&Sw32_registered_hot_keys);
   defsubr (&Sw32_reconstruct_hot_key);
   defsubr (&Sw32_toggle_lock_key);
+  defsubr (&Sw32_window_exists_p);
   defsubr (&Sw32_find_bdf_fonts);
 
   defsubr (&Sfile_system_info);
-- 
2.39.2