C# Getting window's title by handle in Hebrew return question marks

Question

I am using this: to get window's title by its handle:

[DllImport("user32.dll")] private static extern int GetWindowText(int hWnd, StringBuilder title, int size);

StringBuilder title = new StringBuilder(256);
GetWindowText(hWnd, title, 256);

If the title has hebrew chars, it replaces them by question marks.
I guess the problem is related to econding or something... how can I solve it?

Answer 1

Use this:

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int GetWindowText(int hWnd, StringBuilder title, int size);

Answer 2

Your question contains a little error, that might not occurs very often. You assume, that the title has a max length of 256 characters, which might be enough for most cases. But as this post shows, the length could be at 100K characters, maybe more. So I would use another helper function: GetWindowTextLength

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern int GetWindowTextLength(IntPtr hWnd);

public static string GetWindowTitle(IntPtr hWnd)
{
    var length = GetWindowTextLength(hWnd) + 1;
    var title = new StringBuilder(length);
    GetWindowText(hWnd, title, length);
    return title.ToString();
}