From 6db722624912c1155e3932ecdaca7c0a313ec693 Mon Sep 17 00:00:00 2001
From: Peter Kirmeier <topeterk@users.noreply.github.com>
Date: Sat, 12 Nov 2022 19:31:47 +0100
Subject: [PATCH] Fix 32bit support

---
 NativeDllImport/ShowWindow.cs | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/NativeDllImport/ShowWindow.cs b/NativeDllImport/ShowWindow.cs
index 2a70ea1..b26d91f 100644
--- a/NativeDllImport/ShowWindow.cs
+++ b/NativeDllImport/ShowWindow.cs
@@ -26,23 +26,46 @@ namespace SystemTrayMenu.DllImports
         {
             WindowInteropHelper wndHelper = new WindowInteropHelper(window);
 
-            int exStyle = (int)GetWindowLongPtr(wndHelper.Handle, GWL_EXSTYLE);
-            exStyle |= WS_EX_TOOLWINDOW; // do not show when user presses alt + tab
-            SetWindowLongPtr(wndHelper.Handle, GWL_EXSTYLE, (IntPtr)exStyle);
+            if (Environment.Is64BitProcess)
+            {
+                long exStyle = (long)GetWindowLongPtr(wndHelper.Handle, GWL_EXSTYLE);
+                exStyle |= WS_EX_TOOLWINDOW; // do not show when user presses alt + tab
+                SetWindowLongPtr(wndHelper.Handle, GWL_EXSTYLE, (IntPtr)exStyle);
+            }
+            else
+            {
+                int exStyle = (int)GetWindowLong(wndHelper.Handle, GWL_EXSTYLE);
+                exStyle |= WS_EX_TOOLWINDOW; // do not show when user presses alt + tab
+                SetWindowLong(wndHelper.Handle, GWL_EXSTYLE, (IntPtr)exStyle);
+            }
         }
 
+        /// <summary>
+        /// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getwindowlongw .
+        /// </summary>
+        [SupportedOSPlatform("windows")]
+        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
+        private static extern IntPtr GetWindowLong(IntPtr hWnd, int nIndex);
+
         /// <summary>
         /// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getwindowlongptrw .
         /// </summary>
         [SupportedOSPlatform("windows")]
-        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
         private static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);
 
+        /// <summary>
+        /// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setwindowlongw .
+        /// </summary>
+        [SupportedOSPlatform("windows")]
+        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
+        private static extern IntPtr SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
+
         /// <summary>
         /// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-setwindowlongptrw .
         /// </summary>
         [SupportedOSPlatform("windows")]
-        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Winapi)]
         private static extern IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
     }
 }