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WM_CHARTOITEM Overview Group

The WM_CHARTOITEM message is sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a WM_CHAR message.

WM_CHARTOITEM 

nKey = LOWORD(wParam);          // key value 

nCaretPos = HIWORD(wParam);     // caret position 

hwndListBox = (HWND) lParam;    // handle of list box

Parameters

nKey: Value of the low-order word of wParam. Specifies the value of the key the user pressed.
nCaretPos: Value of the high-order word of wParam. Specifies the current position of the caret.
hwndListBox: Value of lParam. Identifies the list box.

Return Values

The return value specifies the action that the application performed in response to the message. A return value of -1 or -2 indicates that the application handled all aspects of selecting the item and requires no further action by the list box. A return value of 0 or greater specifies the zero-based index of an item in the list box and indicates that the list box should perform the default action for the keystroke on the given item.

Default Action

The DefWindowProc function returns -1.

Remarks

Only owner-drawn list boxes that do not have the LBS_HASSTRINGS style can receive this message.