get fore ground window

GetForegroundWindow.cs

/// <summary>
/// by fairjm.
/// 2016/02/19
/// </summary>
class Program
{
	[DllImport("user32.dll")]
	static extern IntPtr GetForegroundWindow();

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

	[DllImport("user32.dll")]
	public static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out uint ProcessId);

	static void Main(string[] args)
	{
		var a = new { name = "cc" };
		while (true)
		{
			Thread.Sleep(1000);
			IntPtr handler = GetForegroundWindow();
			if(handler == null)
			{
				Console.WriteLine("No Process");
				continue;
			}
			uint pid;
			GetWindowThreadProcessId(handler, out pid);
			Console.WriteLine($"Current Time:{DateTime.Now.ToString()}");
			Console.WriteLine($"Id: {pid}");
			var process = Process.GetProcessById((int)pid);
			Console.WriteLine($"Process File Name: {process.MainModule.FileName}");
			Console.WriteLine($"Process Title: {process.MainWindowTitle}");
			Console.WriteLine($"Process Name: {process.ProcessName}");
		}
	}
}