Initial commit

.gitignore

@@ -0,0 +1,10 @@
+bin/
+obj/
+Properties/
+
+.git/
+.vs/
+.vscode/
+
+BorderlessApp.csproj
+BorderlessApp.csproj.user

Program.cs

@@ -0,0 +1,151 @@
+using System.Runtime.InteropServices;
+using System.Text;
+
+class Program
+{
+    const int GWL_STYLE = -16;
+    const uint WS_CAPTION = 0x00C00000;
+    const uint WS_THICKFRAME = 0x00040000;
+    const uint SWP_FRAMECHANGED = 0x0020;
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern IntPtr FindWindow(string lp_class_name, string lp_window_name);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern uint GetWindowLong(IntPtr h_wnd, int n_index);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern uint SetWindowLong(IntPtr h_wnd, int n_index, uint dw_new_long);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern bool SetWindowPos(IntPtr h_wnd, IntPtr h_wnd_insert_after, int x, int y, int cx, int cy, uint u_flags);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern bool EnumWindows(EnumWindowsProc lp_enum_func, IntPtr l_param);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern int GetWindowText(IntPtr h_wnd, StringBuilder lp_string, int n_max_count);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern bool IsWindowVisible(IntPtr h_wnd);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    static extern int GetSystemMetrics(int n_index);
+
+    delegate bool EnumWindowsProc(IntPtr h_wnd, IntPtr l_param);
+
+    static void Main()
+    {
+        bool app_found = false;
+        while (!app_found)
+        {
+            Console.Clear();
+            Console.Write("App Name (partial): ");
+            string partial_name = Console.ReadLine();
+
+            var windows = FindWindowsByPartialName(partial_name);
+
+            if (windows.Count == 0)
+            {
+                Console.WriteLine("App not found. Please try again.");
+                continue;
+            }
+
+            int current_selection = 0;
+            bool is_running = true;
+
+            while (is_running)
+            {
+                Console.SetCursorPosition(0, 0);
+                Console.ResetColor();
+                Console.WriteLine("Select an app (use arrow keys to navigate and Enter to select):");
+
+                for (int i = 0; i < windows.Count; i++)
+                {
+                    if (i == current_selection)
+                    {
+                        Console.BackgroundColor = ConsoleColor.Blue;
+                        Console.ForegroundColor = ConsoleColor.White;
+                    }
+                    else
+                    {
+                        Console.ResetColor();
+                    }
+
+                    Console.WriteLine(windows[i].Title);
+                }
+
+                ConsoleKeyInfo key = Console.ReadKey(intercept: true);
+
+                if (key.Key == ConsoleKey.UpArrow)
+                {
+                    current_selection = (current_selection - 1 + windows.Count) % windows.Count;
+                }
+                else if (key.Key == ConsoleKey.DownArrow)
+                {
+                    current_selection = (current_selection + 1) % windows.Count;
+                }
+                else if (key.Key == ConsoleKey.Enter)
+                {
+                    IntPtr h_wnd = windows[current_selection].Handle;
+
+                    SetBorderless(h_wnd);
+
+                    Console.ResetColor();
+                    Console.Clear();
+                    Console.WriteLine("App is running in borderless mode. Press any key to exit.");
+
+                    Console.ReadKey();
+                    RestoreWindow(h_wnd);
+                    is_running = false;
+                }
+            }
+
+            app_found = true;
+        }
+    }
+
+    static void SetBorderless(IntPtr h_wnd)
+    {
+        uint styles = GetWindowLong(h_wnd, GWL_STYLE);
+        styles &= ~WS_CAPTION & ~WS_THICKFRAME;
+        SetWindowLong(h_wnd, GWL_STYLE, styles);
+
+        int screen_width = GetSystemMetrics(0);
+        int screen_height = GetSystemMetrics(1);
+
+        SetWindowPos(h_wnd, IntPtr.Zero, 0, 0, screen_width, screen_height, SWP_FRAMECHANGED);
+        Console.WriteLine("Set to fullscreen borderless");
+    }
+
+    static void RestoreWindow(IntPtr h_wnd)
+    {
+        uint styles = GetWindowLong(h_wnd, GWL_STYLE);
+        styles |= WS_CAPTION | WS_THICKFRAME;
+        SetWindowLong(h_wnd, GWL_STYLE, styles);
+
+        SetWindowPos(h_wnd, IntPtr.Zero, 0, 0, 1280, 720, SWP_FRAMECHANGED);
+        Console.WriteLine("Restored to windowed mode");
+    }
+
+    static List<(IntPtr Handle, string Title)> FindWindowsByPartialName(string partial_name)
+    {
+        var windows = new List<(IntPtr Handle, string Title)>();
+
+        EnumWindows((h_wnd, l_param) =>
+        {
+            if (!IsWindowVisible(h_wnd))
+                return true;
+
+            var title = new StringBuilder(256);
+            GetWindowText(h_wnd, title, title.Capacity);
+
+            if (title.ToString().Contains(partial_name, StringComparison.OrdinalIgnoreCase))
+                windows.Add((h_wnd, title.ToString()));
+
+            return true;
+        }, IntPtr.Zero);
+
+        return windows;
+    }
+}