CListBox::CompareItem()

[gokings]

Does anyone happen to have a complete buildable project using ClistBox::CompareItem()? If I set the list box to "has strings", CompareItem() is never called. If I uncheck "has strings", then CompareItem() is called, but all the information in the COMPAREITEMSTRUCT regarding item 2 appears to be garbage. Thanks

[Jose Lamas Rios]

It's been a while since I used that, but I found some code for an owner-drawn CClassListBox (derived from CListBox) without "has strings", in which: I added items to the listbox using something like

int CClassListBox::AddItem(CFormClass* pClass)
{
ASSERT_VALID(pClass);
return AddString((char*) pClass);
}

int CClassListBox::InsertItem(UINT nIndex, CFormClass* pClass)
{
ASSERT_VALID(pClass);
return InsertString(nIndex, (char*) pClass);
}

then DrawItem, MeasureItem, CompareItem, etc., received these CFormClass pointers as the itemData fields. The CompareItem() implementation was:

int CClassListBox::CompareItem(LPCOMPAREITEMSTRUCT lpCIS)
{
CFormClass* pI1 = (CFormClass*) lpCIS->itemData1;
CFormClass* pI2 = (CFormClass*) lpCIS->itemData2;

ASSERT\_VALID(pI1);
ASSERT\_VALID(pI2);
ASSERT(pI1->IsKindOf(RUNTIME\_CLASS(CFormClass)));
ASSERT(pI2->IsKindOf(RUNTIME\_CLASS(CFormClass)));

if (pI1->IsGraphic() && !pI2->IsGraphic())
	return -1;

if (!pI1->IsGraphic() && pI2->IsGraphic())
	return 1;

int i = stricmp(pI1->GetName(),pI2->GetName());
if (i < 0)
	i = -1;
else if (i > 0)
	i = 1;
 
return i;

}

Hope that helps, -- jlr http://jlamas.blogspot.com/[^]