WH_MOUSE和WH_MOUSE_LL钩子之间的区别是什么？

问题描述

我发现 WH_MOUSE 并不总是被调用。问题是我使用 WH_MOUSE 而不是 WH_MOUSE_LL ？

I've found that WH_MOUSE is not always called. Could the problem be that I'm using WH_MOUSE and not WH_MOUSE_LL?

代码：

class MouseHook
{
public:
  static signal<void(UINT, const MOUSEHOOKSTRUCT&)> clickEvent;

  static bool install()
  {
    if (isInstalled()) return true;
    hook = ::SetWindowsHookEx(WH_MOUSE, (HOOKPROC)&mouseProc,
                                ::GetModuleHandle(NULL), NULL);
    return(hook != NULL);
  }

  static bool uninstall()
  {
    if (hook == NULL) return TRUE;
    bool fOk = ::UnhookWindowsHookEx(hook);
    hook = NULL;
    return fOk != FALSE;
  }

  static bool isInstalled() { return hook != NULL; }

private:
   static LRESULT CALLBACK mouseProc(int nCode, WPARAM wParam, LPARAM lParam)
   {
      if (nCode == HC_ACTION &&
        (wParam == WM_LBUTTONDOWN || wParam == WM_NCLBUTTONDOWN ||
         wParam == WM_RBUTTONDOWN || wParam == WM_NCRBUTTONDOWN ||
         wParam == WM_MBUTTONDOWN || wParam == WM_NCMBUTTONDOWN ))
      {
        MOUSEHOOKSTRUCT* mhs = (MOUSEHOOKSTRUCT*) lParam;
        clickEvent(wParam, *mhs);
      }

      return ::CallNextHookEx(hook, nCode, wParam, lParam);
    }

   static HHOOK hook;
};

推荐答案

区别在于调用回调时的行为。
如果你使用lowlevel版本，你不会在lpfn的限制，因为调用你的钩子函数的方式执行。有关详细信息，请阅读下面。
从MSDN的SetWindowsHookEx的文档引用：

The difference is in the behavior when the callback gets called.If you're using the lowlevel version you don't incur in the limitations posed by lpfn because of the way the call to your hook function is performed. Please read below for more information.Quoting from MSDN's doc for SetWindowsHookEx:

和从LowLevelKeyboardProc：

and from LowLevelKeyboardProc:

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