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Home » Tip Bank » C++
Language: C++
Expertise: Beginner
Apr 22, 1998

Sorting in a ListView

Question:
I would like to know how to program a Custom Sort procedure on a ListView in Borland's C++ Builder.

Answer:
Normally, the ListView control will sort items automatically for you. However, it may not sort them in the order you want. For example, alphabetically, "10/1/98" comes before "4/1/98," but you would probably prefer that these items appear chronologically.

The exact syntax needed to sort items in a custom order depends on your compiler and if you are using application frameworks. Basically, you need to create your ListView control without the LVS_SORTASCENDING or LVS_SORTDESCENDING window styles.

Send an LVM_SORTITEMS message to the control, or use the ListView_SortItems macro. Either approach requires you to specify the address of a compare function that you must define. The compare function must have the following form:

int CALLBACK CompareFunc(LPARAM lParam1, LPARAM
lParam2, LPARAM lParamSort);
Windows will call this function with each item to be sorted. The lParam1 and lParam2 arguments specify the 32-bit values associated with each item being compared. These are the values that you specified in the lParam member of the LVITEM structure when you add the items to the list.

Your comparison function should return a negative value if the first item comes before the second item, or a positive value if the second item comes before the first item. If the two items are equal, the comparison function should return 0.

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