The LVM_SORTITEMS message uses an application-defined comparison function to sort the items of a list view control. The index of each item changes to reflect the new sequence. You can send this message explicitly or by using the ListView_SortItems macro.
LVM_SORTITEMS wParam = (WPARAM) (LPARAM) lParamSort; lParam = (LPARAM) (PFNLVCOMPARE) pfnCompare;
Returns TRUE if successful or FALSE otherwise.
The comparison function has the following form:
int CALLBACK CompareFunc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort);
The lParam1 parameter is the 32-bit value associated with the first item being compared; and the lParam2 parameter is the value associated with the second item. These are the values that were specified in the lParam member of the itemsí LV_ITEM structure when they were inserted into the list. The lParamSort parameter is the same value passed to the LVM_SORTITEMS message.
The comparison function must return a negative value if the first item should precede the second, a positive value if the first item should follow the second, or zero if the two items are equivalent.
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