General Discussion I am trying to retrieve a selected value from a listbox and store it in a string variable using Win API

Fri, 23 Jan 2009 12:00:54 Z

I am trying to retrieve a selected value from a listbox and store it in
a string variable.
I am using the following code:
            int count = 0;
            List<string> retVal = new List<string>();
            string item;
            IntPtr zero = new IntPtr(0);

            //Get the count of items in the list
            IntPtr ptr = SendMessage(listBox1.Handle, LB_GETCOUNT, zero, zero);

            count = ptr.ToInt32();

            StringBuilder sbText = new StringBuilder(256 + 1);
            SendMessage(listBox1.Handle, LB_GETTEXT, (count - 1), sbText);
            string str = sbText.ToString();

            MessageBox.Show("Text:" + str.Trim());
    This does not work and when I look at the value of Text it is
    "[09]" and not as I expected.

im passing the listbox handle to VC dll, which in turn will post back message to listbox.the problem is "listbox.count" shows me zero.so im using WIN API to retrieve the text from listbox. using LB_GETCOUNT im able to get the counts correctly but using LB_GETTEXT it gives me some junk value.

General Discussion I am trying to retrieve a selected value from a listbox and store it in a string variable using Win API

Fri, 23 Jan 2009 16:41:10 Z

Hi Chandrashekar, this forum is for software developers who are using the Open Protocol Specification documentation to assist them in developing systems, services, and applications. The Open Protocol Specifications can be found at: http://msdn2.microsoft.com/en-us/library/cc203350.aspx. Since your post does not appear to be related to the Open Protocol Specification documentation set we would appreciate it if you could try the 'Windows SDK' forum at http://social.msdn.microsoft.com/forums/en-US/windowssdk/threads/, or the 'Visual C# Language' forum at http://social.msdn.microsoft.com/forums/en-US/csharplanguage/threads/ instead to find the information you are looking for. Thanks!

Regards,
Bill Wesse - MSFT

Escalation Engineer