WM_NEXTDLGCTL消息,
wCtlFocus = wParam; // identifies control for focus
fHandle = (BOOL) LOWORD(lParam); // wParam handle flag
Parameters
wCtlFocus
Value of wParam. If the fHandle parameter is TRUE, the wCtlFocus parameter identifies the control that receives the focus. If fHandle is FALSE, wCtlFocus is a flag that indicates whether the next or previous control with the WS_TABSTOP style receives the focus. If wCtlFocus is zero, the next control receives the focus; otherwise, the previous control with the WS_TABSTOP style receives the focus.
fHandle
Value of lParam. Contains a flag that indicates how Windows uses the wCtlFocus parameter. If the fHandle parameter is TRUE, wCtlFocus is a handle associated with the control that receives the focus; otherwise, wCtlFocus is a flag that indicates whether the next or previous control with the WS_TABSTOP style receives the focus.
perform(WM_NEXTDLGCTL,1,0)可以让焦点向前移动
