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Sorts list view items using an application-defined comparison function.

BOOL SortItems(
   PFNLVCOMPARE pfnCompare,
   DWORD_PTR dwData 



Address of the application-defined comparison function. The comparison function is called during the sort operation each time the relative order of two list items needs to be compared. The comparison function must be either a static member of a class or a stand-alone function that is not a member of any class.


Application-defined value that is passed to the comparison function.

Nonzero if successful; otherwise zero.

The index of each item changes to reflect the new sequence.

The comparison function has the following form:

int CALLBACK CompareFunc(LPARAM lParam1, LPARAM lParam2, 
   LPARAM lParamSort);

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.

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 items' LVITEM structure when they were inserted into the list. The lParamSort parameter is the same as the dwData value.

The following is a simple comparison function that results in items being sorted by their lParam values.

// Sort items by associated lParam
static int CALLBACK 
MyCompareProc(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort)
   return (int)(lParam1 - lParam2);