C# how to use WM_GETTEXT / GetWindowText API / Window Title

public class GetTextTestClass{

    [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
    public static extern bool SendMessage(IntPtr hWnd, uint Msg, int wParam, StringBuilder lParam);

    [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
    public static extern IntPtr SendMessage(int hWnd, int Msg, int wparam, int lparam);

    const int WM_GETTEXT       = 0x000D;
    const int WM_GETTEXTLENGTH = 0x000E;

    public string GetControlText(IntPtr hWnd){

        // Get the size of the string required to hold the window title (including trailing null.) 
        Int32 titleSize = SendMessage((int)hWnd, WM_GETTEXTLENGTH, 0, 0).ToInt32();

        // If titleSize is 0, there is no title so return an empty string (or null)
        if (titleSize == 0)
            return String.Empty;

        StringBuilder title = new StringBuilder(titleSize + 1);

        SendMessage(hWnd, (int)WM_GETTEXT, title.Capacity, title);

        return title.ToString();

Leave a Comment