Dialog LB output problems.

I am trying to get output to a list box in my dialog working.

Here is an example of the function I am using.
SendMessage(GetDlgItem( hChildHandle, IDC_SESSIONS ),LB_ADDSTRING,0,(LPARAM)szText);

hChildHandle is equal to my main window handle
do I need a seperate handle for my dialog, if so how do I get it.

Little confused about handles.

You may want to make the third parameter of SendMessage() look like this:

(WPARAM) strlen(szText),

That didn't work.
Here is the code for my output function.
note I am sending main_window_handl,szstring to the function

Code:

---

void vShowText(HWND        hChildHandle, char *szText)
{
        int Line;
       

        // add string to the listbox
        SendMessage(GetDlgItem( hChildHandle, IDC_SESSIONS ),LB_ADDSTRING,(WPARAM)strlen(szText),(LPARAM)szText);
       
        // determine number of items in listbox
        Line = SendMessage(GetDlgItem( hChildHandle, IDC_SESSIONS ),LB_GETCOUNT,0,0);
       
        // flag last item as the selected item, to scroll listbox down
        SendMessage(GetDlgItem( hChildHandle, IDC_SESSIONS ),LB_SETCURSEL,Line-1,0);
       
        // unflag all items to eliminate negative highlite
        SendMessage(GetDlgItem( hChildHandle, IDC_SESSIONS ),LB_SETCURSEL,-1,0);
        EnableWindow(GetDlgItem(hChildHandle, IDC_SESSIONS ), FALSE );

}

---

it was the handle that was the main problem
I set up a global variable for hDlg then initialized it in the init section of the dialog call back procedure
then I changed all the function calls to reflect the new handle

presto it works (except for my send message button lol but I'll work on that)