How to return text from Native (C++) code

Question

I am using Pinvoke for Interoperability between Native(C++) code and Managed(C#) code. What i want to achieve is get some text from native code into my managed code. For thi

Answer 1

Here is an example of doing this through C#. I am calling Native function GetWindowText through C# by pInvoking. GetWindowText returns the caption of the window whose handle is passed to it.

    [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 GetText(IntPtr hWnd)
    {
        // Allocate correct string length first
        int length = GetWindowTextLength(hWnd);
        StringBuilder sb = new StringBuilder(length + 1);
        GetWindowText(hWnd, sb, sb.Capacity);
        return sb.ToString();
    }        

    private void button1_Click(object sender, EventArgs e)
    {
        string str = GetText(this.Handle);
    }