How to Get the Title of the Current Active Window Using C#

How do I get the title of the current active window using c#?

See example on how you can do this with full source code here:

http://www.csharphelp.com/2006/08/get-current-window-handle-and-caption-with-windows-api-in-c/

[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();

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

private string GetActiveWindowTitle()
{
    const int nChars = 256;
    StringBuilder Buff = new StringBuilder(nChars);
    IntPtr handle = GetForegroundWindow();

    if (GetWindowText(handle, Buff, nChars) > 0)
    {
        return Buff.ToString();
    }
    return null;
}

Edited with @Doug McClean comments for better correctness.

c# - Get current window title

Can you stick it in a loop on another thread. Have two variables: previousWindow and currentWindow. Keep comparing them, when they change - you update your log file.

How to get active window that is not part of my application?

Check this code:

[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();


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

private string GetActiveWindowTitle()
{
    const int nChars = 256;
    StringBuilder Buff = new StringBuilder(nChars);
    IntPtr handle = GetForegroundWindow();

    if (GetWindowText(handle, Buff, nChars) > 0)
    {
     return Buff.ToString();
    }
  return null;
}

C# get information about current active window

I think you want "GetWindowModuleFileName()" instead of GetWindowText
You pass in the hwnd, so you'll still need the call to GetForegroundWindow()

Get active window information using C# on Mac

You are looking for the FrontmostApplication of the shared NSWorkspace, it returns a NSRunningApplication instance.

var foreground_app = NSWorkspace.SharedWorkspace.FrontmostApplication;
Console.WriteLine($"Name: {foreground_app.LocalizedName}");
Console.WriteLine($"Pid: {foreground_app.ProcessIdentifier}");

re: https://developer.apple.com/documentation/appkit/nsrunningapplication?language=objc

get the titles of all open windows

Something like this:

using System.Diagnostics;

Process[] processlist = Process.GetProcesses();

foreach (Process process in processlist)
{
    if (!String.IsNullOrEmpty(process.MainWindowTitle))
    {
        Console.WriteLine("Process: {0} ID: {1} Window title: {2}", process.ProcessName, process.Id, process.MainWindowTitle);
    }
}