The COMPAREITEMSTRUCT structure supplies the identifiers and application-supplied data for two items in a sorted, owner-drawn list box or combo box.
Whenever an application adds a new item to an owner-drawn list box or combo box created with the CBS_SORT or LBS_SORT style, Windows sends the owner a WM_COMPAREITEM message. The lParam parameter of the message contains a long pointer to a COMPAREITEMSTRUCT structure. Upon receiving the message, the owner compares the two items and returns a value indicating which item sorts before the other.
typedef struct tagCOMPAREITEMSTRUCT { // cis UINT CtlType; UINT CtlID; HWND hwndItem; UINT itemID1; DWORD itemData1; UINT itemID2; DWORD itemData2; } COMPAREITEMSTRUCT;
This member will be -1 if the item has not been
inserted or when searching for a potential item in the list box or combo box.
This member will be -1 if the item has not been inserted or when searching for a potential item in the list box or combo box.
file: /Techref/os/win/api/win32/struc/src/str02_3.htm, 3KB, , updated: 2000/4/7 11:20, local time: 2024/12/23 05:15,
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