WinAPI ListBox with LBS_NODATA style doesn't work as it expected

Question

Hello, i used this code to create owner drawn listbox.
this->hListBox= CreateWindowEx(WS_EX_CLIENTEDGE
, L"LISTBOX", NULL
, WS_CHILD | WS_VISIBLE |LBS_OWNERDRAWFIXED|LBS_NODATA
, 0, 0, this->Height, this->Width
, this->hWnd, NULL, this->hInstance, NULL);
When it's being initialized, my wndproc recieves WM_MEASUREITEM message, it works fine. But when i'm sending LB_SETCOUNT message, the actual item count doen't change. Also, the WM_DRAWITEM message being sent only when i click the listbox, so no items being
drawn after initialization

Answer 1

Hi,
That is what I thougth as well. According the manual you can use an expresion, column, constant or bind variable for N.
N determines the nth row for which the measure value is to be returned. n can be a
constant, bind variable, column, or an expression involving them, as long as it
resolves to a positive integer. The function returns NULL if the data source window
has fewer than n rows. If n is null, then the function returns an error.
Regards,
Peter