Hook问题
MSDN: nCode
[in] Specifies the hook code. If nCode is less than zero, the hook procedure must pass the message to the CallNextHookEx function without further processing and should return the value returned by CallNextHookEx.
哪位大虾解释一下nCode < 0 是什么情况啊,如果我不CallNextHookEx会有什么后果么?多谢