/// <summary>
/// Gets the title of a window.
/// </summary>
/// <param name="hWnd"> The window. </param>
/// <returns>
/// The title of the window or null if the title cannot be retrieved or <paramref name="hWnd" /> is
/// <see cref="IntPtr.Zero" />.
/// </returns>
/// <remarks>
/// <para>
/// Retrieving a window title can fail in cases the window is blocked and does not react to window messages within
/// one second.
/// </para>
/// </remarks>
public static string GetWindowTitle(IntPtr hWnd)
{
if (hWnd == IntPtr.Zero)
{
return(null);
}
int length = -1;
WindowsWindow.SendMessageTimeout1(hWnd, WindowsWindow.WmGettextlength, IntPtr.Zero, IntPtr.Zero,
WindowsWindow.SmtoAbortifhung | WindowsWindow.SmtoNormal, 1000,
ref length);
if (length == -1)
{
return(null);
}
if (length == 0)
{
return(string.Empty);
}
if (length > 10240)
{
return(null);
}
StringBuilder sb = new StringBuilder(length + 1);
IntPtr temp = new IntPtr();
WindowsWindow.SendMessageTimeout2(hWnd, WindowsWindow.WmGettext, new IntPtr(sb.Capacity), sb,
WindowsWindow.SmtoAbortifhung | WindowsWindow.SmtoNormal, 1000, ref temp);
if (temp.ToInt64() == -1)
{
return(null);
}
if (temp.ToInt64() == 0)
{
return(string.Empty);
}
string title = sb.ToString();
return(title);
}
