Getting Text from any External Window in C#

Getting Text from any External Window in C#

To get the text of an external window you could use the GetForegroundWindow and the GetWindowTextAPI functions. Here is a small example of its usage:

public partial class Form1 : Form    {        [DllImport("user32.dll")]        static extern int GetForegroundWindow();        [DllImport("user32.dll")]        static extern int GetWindowText(int hWnd, StringBuilder text, int count);         //Use SetWindowPos to make app alwaysontop        public Form1()        {            InitializeComponent();        }        private void GetActiveWindow()        {            const int nChars = 256;            int handle = 0;            StringBuilder Buff = new StringBuilder(nChars);            handle = GetForegroundWindow();            if (GetWindowText(handle, Buff, nChars)  0)            {                this.captionWindowLabel.Text = Buff.ToString();                this.IDWindowLabel.Text = handle.ToString();            }        }        private void timer1_Tick(object sender, EventArgs e)        {            GetActiveWindow();        }    } 

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist