Get current Active Window : Native Windows Function « Windows « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows
3. Native Windows Function

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Text;

public class MainClass

    // Declare external functions.
    [DllImport("user32.dll")]
    private static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll")]
    private static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

    public static void Main() {
        int chars = 256;
        StringBuilder buff = new StringBuilder(chars);

        // Obtain the handle of the active window.
        IntPtr handle = GetForegroundWindow();

        // Update the controls.
        if (GetWindowText(handle, buff, chars) > 0)
        {
            Console.WriteLine(buff.ToString());
            Console.WriteLine(handle.ToString());
        }
    }
}