Hittest表示鼠标在窗口的位置，该值是windows处理WM_NCHITTEST消息完毕后的返回结果：
HTBORDER
In the border of a window that does not have a sizing border
HTBOTTOM
In the lower horizontal border of a window
HTBOTTOMLEFT
In the lower-left corner of a window border
HTBOTTOMRIGHT
In the lower-right corner of a window border
HTCAPTION
In a title bar
HTCLIENT
In a client area
HTERROR
On the screen background or on a dividing line between windows (same as HTNOWHERE, except that the DefWindowProc function produces a system beep to indicate an error)
HTGROWBOX
In a size box (same as HTSIZE)
HTHSCROLL
In a horizontal scroll bar
HTLEFT
In the left border of a window
HTMENU
In a menu
HTNOWHERE
On the screen background or on a dividing line between windows
HTREDUCE
In a Minimize buttonHTRIGHT In the right border of a window
HTSIZE
In a size box (same as HTGROWBOX)
HTSYSMENU
In a System menu or in a Close button in a child window
HTTOP
In the upper horizontal border of a window
HTTOPLEFT
In the upper-left corner of a window border
HTTOPRIGHT
In the upper right corner of a window border
HTTRANSPARENT
In a window currently covered by another window
HTVSCROLL
In the vertical scroll bar
HTZOOM
In a Maximize button
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