NM_CLICK Notifies a control's parent window that the user has clicked the left mouse button within the control. NM_CLICK is sent in the form of a WM_NOTIFY message. LVN_COLUMNCLICK Notifies a list view control's parent window that a column was clicked. This notification message is sent in the form of a WM_NOTIFY message. WM_TRAYNOTIRY 是你自定义的消息ON_WM_TIMER 是定时器消息，你设定的时间到了就触发这个消息。
Notifies a control's parent window that the user has clicked the left mouse button within the control. NM_CLICK is sent in the form of a WM_NOTIFY message. LVN_COLUMNCLICK
Notifies a list view control's parent window that a column was clicked. This notification message is sent in the form of a WM_NOTIFY message.
WM_TRAYNOTIRY 是你自定义的消息ON_WM_TIMER 是定时器消息，你设定的时间到了就触发这个消息。
ON_WM_TIMER是时钟产生的
这样比较方便