鼠标钩子响应的奇怪问题！！！

#define _WIN32_WINNT 0x0500   // PKBDLLHOOKSTRUCT

#include <windows.h>



//设置g_hWnd共享，禁止dll拷贝g_hWnd

#pragma data_seg("MyHook")

HWND g_hWnd = NULL;             //窗口句柄

#pragma data_seg()

#pragma comment(linker,"/section:MyHook,RWS")



HHOOK g_hlowKeyHook = NULL;     //低级键盘钩子句柄

HHOOK g_hMouse = NULL;          //鼠标钩子句柄

HHOOK g_hKeyboard = NULL;       //键盘钩子句柄



//屏蔽所有鼠标消息

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)

{

	return 1;

}



//屏蔽所有键盘消息（不包括功能键）

LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)

{

	if (wParam == VK_F8) // 后门

	{

		SendMessage(g_hWnd, WM_CLOSE, 0, 0);   //发送关闭主窗体消息

		//::MessageBox(NULL,"触发钩子后门程序，正在卸载钩子~~关闭程序","提示",MB_OK);

		UnhookWindowsHookEx(g_hlowKeyHook);    //卸载低级键盘钩子

		UnhookWindowsHookEx(g_hMouse);         //卸载鼠标钩子

		UnhookWindowsHookEx(g_hKeyboard);      //卸载键盘钩子

	}

	else

		return 1;

}



//低级键盘钩子

LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)

{

	bool isClick = false;

	PKBDLLHOOKSTRUCT LowKey = NULL;   //该结构体包含底层键盘输入事件的信息

	

	if (nCode == HC_ACTION)      //HC_ACTION  表示有消息

	{

		LowKey = (PKBDLLHOOKSTRUCT)lParam;

		switch (wParam)

		{

        case WM_KEYDOWN: isClick = 0; break;

        case WM_SYSKEYDOWN:

        case WM_KEYUP:

        case WM_SYSKEYUP:

			{              // 屏蔽Win

				isClick = (LowKey->vkCode == VK_LWIN) || (LowKey->vkCode == VK_RWIN) ||  

					//屏蔽Alt+F4

					((LowKey->vkCode == VK_F4) && ((LowKey->flags & LLKHF_ALTDOWN) != 0)) ||

					// 屏蔽Alt+Tab

					((LowKey->vkCode == VK_TAB) && ((LowKey->flags & LLKHF_ALTDOWN) != 0)) ||

					// 屏蔽Alt+Esc

					((LowKey->vkCode == VK_ESCAPE) && ((LowKey->flags & LLKHF_ALTDOWN) != 0)) ||

					// 屏蔽Ctrl+Esc

					((LowKey->vkCode == VK_ESCAPE) && ((GetKeyState(VK_CONTROL) & 0x8000) != 0));

				break;

			}

        default:

            break;

		}

	}

	if (isClick)

		return 1;

	else

		CallNextHookEx(g_hlowKeyHook,nCode,wParam,lParam);  //传给下一个钩子

}



//安装钩子

void SetHook(HWND hWnd)  

{

	g_hWnd = hWnd;               //越后安装的钩子，越先获得控制权 

    //安装低级键盘钩子  优先级3

	g_hlowKeyHook = SetWindowsHookEx(WH_KEYBOARD_LL,LowLevelKeyboardProc,GetModuleHandle("GHookDll"),0);

	//安装键盘钩子      优先级2

	g_hKeyboard = SetWindowsHookEx(WH_KEYBOARD,KeyboardProc,GetModuleHandle("GHookDll"),0);

	//安装鼠标钩子      优先级1

	g_hMouse = SetWindowsHookEx(WH_MOUSE,MouseProc,GetModuleHandle("GHookDll"),0);

}

LIBRARY GHookDll

EXPORTS

SetHook  @2

BOOL CGlobalHookDlg::OnInitDialog()

{

	CDialog::OnInitDialog();



	// Add "About..." menu item to system menu.

	HINSTANCE hInst;

	hInst = LoadLibrary("GHookDLL.dll");  //动态加载dll

	typedef void (*SetHookProc)(HWND hWnd);  

	SetHookProc SetHook = (SetHookProc)GetProcAddress(hInst,"SetHook");

	SetHook(m_hWnd);

	// IDM_ABOUTBOX must be in the system command range.

	//...................省略

	

	return TRUE;  // return TRUE  unless you set the focus to a control

}