Get text of selected item in listbox

[L J]

I have source:

LRESULT Vyber = SendDlgItemMessage(hwnd, IDListBox, LB_GETCURSEL, 0, 0);
LRESULT Len = SendDlgItemMessage(hwnd, IDListBox, LB_GETTEXTLEN, 0, 0);
LRESULT Item = SendDlgItemMessage(hwnd, IDListBox, LB_GETTEXT, Vyber, Len + 1);

MessageBox(hwnd,(LPCSTR) Item,"",MB_OK);

My programm falls down if I run this, but I do not why.
Could someone tell me, please?

[kbw]

Shouldn't you be passing a buffer to receive the text for LB_GETTEXT?

[L J]

Yes!! Of course. Thank you very much!! So stupid failure and too many problems. Thank you very much again!