Virtual list (Problems with parameter/pointer) - c++

Question

I am trying to convert my CListCtrl into a virtual list, but i dont know which parameter i have to use
// --- Virtual List ---
void CSpielebibliothekGUIDlg::OnGetdispinfoList(NMHDR* pNMHDR, LRESULT* pResult) // --- nullptr muss weg ---
{
LPNMITEMACTIVATE pNMIA = reinterpret_cast<LPNMITEMACTIVATE>(pNMHDR);
LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;
LV_ITEM* pItem = &(pDispInfo)->item;
int itemid = pItem->iItem;
if (pItem->mask & LVIF_TEXT)
{
CString text;
// --- Welche Spalte ---
if (pItem->iSubItem == 0)
{
// --- Name ---
text = Spiele[itemid].m_Name;
}
if (pItem->iSubItem == 1)
{
//Text is slogan
text = Spiele[itemid].m_Plattform;
}
if (pItem->iSubItem == 2)
{
text = Spiele[itemid].m_Genre;
}
if (pItem->iSubItem == 3)
{
CString Release;
Release.Format(_T("%d"), Spiele[itemid].m_Erscheinungsjahr);
text = Release;
}
if (pItem->iSubItem == 4)
{
CString Preis;
Preis.Format(_T("%g"), Spiele[itemid].m_Preis);
text = Preis;
}
if (pItem->iSubItem == 5)
{
CString EAN;
EAN.Format(_T("%d"), Spiele[itemid].m_EAN);
text = EAN;
}
if (pItem->iSubItem == 6)
{
text = Spiele[itemid].Verwandschaft;
}
lstrcpyn(pItem->pszText, text, pItem->cchTextMax);
}
*pResult = 0;
}
this is my function call
OnGetdispinfoList(nullptr, nullptr);
of course the nullptr are not right, iam glad for any help.

Answer 1

You don't need to call message handlers, they will be called by system after you:
Set proper window styles (LVS_OWNERDATA)
Set item count
Add your OnGetdispinfoList to the message map