ScreenSwitcher

ScreenSwitcher is a high-performance, lightweight background utility for Windows 11 designed for users with multi-monitor setups, specifically those using a secondary Smart TV (like an LG OLED). It removes the friction of manual display management and TV power controls by combining them into instant, global keyboard shortcuts.

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🚀 Key Features

• Global Hotkeys: Switch display modes instantly from anywhere in Windows without opening menus.
• Smart TV Integration: Automatically sends a "Magic Packet" (Wake-on-LAN) to power on your TV when switching to the secondary screen.
• Asynchronous Execution: Display switching is triggered immediately; network signals for the TV are handled in the background to ensure zero lag in hotkey responsiveness.
• Robust Networking: Uses a burst-packet strategy (sending 5 packets across both ports 7 and 9) across all available network interfaces to ensure your TV wakes up reliably every time.
• Silent Background Operation: Runs as a hidden process with no taskbar clutter.
• Auto-Startup: Automatically registers with Windows to start when you log in.

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⌨️ Shortcuts

Shortcut	Action
Shift + Ctrl + 1	PC Screen Only: Instantly enables your primary monitor.
Shift + Ctrl + 2	Second Screen Only: Powers on your Smart TV (WoL) and switches display to it.

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⚙️ Configuration for TV Power on functionality

The program uses a config.json file for settings. To get started:

1. Copy config.json.template to config.json.
2. Edit config.json with your TV's details.

{
  "EnableTvWake": true,
  "TvMacAddress": "00:00:00:00:00:00"
}

• EnableTvWake: Toggle the Wake-on-LAN feature true or false.
• TvMacAddress: The physical MAC address of your TV. Supports formats like 00:00:00:00:00:00, 00-00-00..., or 000000....

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🛠️ Setup & Requirements

1. Prerequisites

• .NET 10.0 Runtime (Windows)
• An LG OLED or any Smart TV that supports Wake-on-LAN.

2. TV Preparation

• Ensure your TV is connected to the same local network as your PC.
• Enable "Wake-on-LAN" or "Mobile/Network Power On" in your TV settings.
  • LG TVs: Settings > General > Devices > External Devices > TV On With Mobile -> ON.

3. Deployment

1. Build the project using dotnet build -c Release.
2. Copy config.json.template to config.json in the root or build folder.
3. Edit config.json with your TV's MAC address.
4. Launch ScreenSwitcher.exe. It will automatically add itself to your Windows Startup.

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🔍 Technical Implementation

Component	Detail
Language	C# 13
Framework	.NET 10 (WinForms for Message Loop)
Display Engine	Native Windows DisplaySwitch.exe integration
WoL Logic	Multicast UDP (Interface-aware directed broadcast)
Configuration	Singleton Caching for zero-latency shortcut processing
Persistence	Windows Registry (HKCU Run Key)

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📜 License

This project is open-source and available under the MIT License.