WM_VKEYTOITEM
The
WM_VKEYTOITEM message is sent by a list box with the LBS_WANTKEYBOARDINPUT
style to its owner in response to a WM_KEYDOWN message.
WM_VKEYTOITEM
vkey = LOWORD(wParam); // virtual-key code
nCaretPos = HIWORD(wParam); // caret position
hwndLB = lParam; // handle of list box
Parameters
vkey
Value of the
low-order word of wParam. Specifies the virtual-key code of the key the
user pressed.
nCaretPos
Value of the
high-order word of wParam. Specifies the current position of the caret.
hwndLB
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 -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 -1 indicates that the list box should perform the
default action in response to the keystroke. A return value of 0 or greater
specifies the 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.
See Also