🪟 Transparency

A Windows Forms utility written in C# that allows you to inspect, select, and control other open windows on the system.

This tool lets you:

• List all visible windows
• Select a target window
• Pin it Always on Top
• Make it click-through
• Adjust window transparency

It uses Win32 API (user32.dll) calls via P/Invoke to manipulate window behavior at the OS level.

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📥 Download

You can download the prebuilt executable (ZIP) here:

👉 Download Windows Overlay Controller (.exe)

⚠️ Windows may show a security warning for unsigned executables.
This is expected for locally built applications.

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✨ Features

🧾 Window Enumeration

• Lists all currently visible top-level windows
• Auto-refreshes the window list every 3 seconds
• Manual refresh button available
• Preserves selection when refreshing

🎯 Window Selection

• Select a window by its title
• Save selected window for later use
• Open a dedicated control panel for the selected window

🧷 Window Controls

• Always on Top (Pin)
• Click-Through Mode (mouse events pass through the window)
• Transparency Control (0–100%)

🖥️ Real-Time Control

• Changes apply instantly using Win32 API
• Control panel stays on top for convenience

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🧠 How It Works

Window Listing

• Uses EnumWindows to enumerate all top-level windows
• Filters only visible windows using IsWindowVisible
• Retrieves window titles via GetWindowText

Window Identification

• Selected windows are identified by their title
• FindWindow is used to retrieve the target window handle (HWND)

Window Manipulation

Window behavior is modified using extended window styles:

• WS_EX_LAYERED for transparency
• WS_EX_TRANSPARENT for click-through
• SetWindowPos for top-most behavior
• SetLayeredWindowAttributes for alpha blending

All logic is centralized in a reusable WindowUtility helper class.

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🧱 Project Structure

Textual overview of the project layout:

• Program entry point (Main)
• Window list UI (NameGetter1)
• Window control UI (WindowControlForm)
• Win32 helper utilities (WindowUtility)
• Shared state models (selected window tracking)

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🚀 How to Run

1. Open the project in Visual Studio
2. Build the solution (Any CPU / x86 recommended)
3. Run the application
4. Select a window from the list
5. Click Window Control to modify its behavior

⚠️ Some windows (system or protected apps) may not allow full control.

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🛠️ Technical Details

• Language: C#
• Framework: .NET (WinForms)
• Platform: Windows
• UI Toolkit: Windows Forms
• Interop: Win32 API (user32.dll via P/Invoke)

Key Win32 Functions Used

• EnumWindows
• GetWindowText
• FindWindow
• SetWindowLong
• SetWindowPos
• SetLayeredWindowAttributes

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🚀 How to Run

Option 1: Run Prebuilt Executable

1. Download and extract the ZIP file
2. Run the .exe file
3. Select a window from the list
4. Click Window Control to modify its behavior

Option 2: Build from Source

1. Open the project in Visual Studio
2. Build the solution (Any CPU / x86 recommended)
3. Run the application

⚠️ Some windows (system or protected apps) may not allow full control.

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🔮 Future Improvements

• Handle windows using HWND instead of title (more reliable)
• Per-window profiles (save/load settings)
• Keyboard shortcuts
• Multi-monitor support
• WPF version for modern UI
• Exception handling for protected windows

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📜 License

This project is released under the MIT License.
Free to use, modify, and extend for learning or personal projects.