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本文實例講述了C++實現修改函數代碼HOOK的封裝方法，分享給大家供大家參考。具體實現方法如下：

一、對外的接口如下：

1. 類初始化時對函數HOOK
2. 取消掛鉤：
void UnHook();
3. 重新掛鉤：
void ReHook();

在初始化時HOOK的代碼：

復制代碼代碼如下:

*(DWORD*)(m_btNewBytes+1) = (DWORD)pfnHook;

8個字節的代碼地址 0xB8, 0x00, 0x00,0x40,0x00,0xFF,0xE0,0x00 只要把第二位和第三位的數據改成函數的地址，調用原先的函數時就會調到自定義的函數執行.

二、實現方法：

.h頭文件如下：

復制代碼代碼如下:

	#ifndef  _ULHOOK_H__ 

	#define _ULHOOK_H__ 

	#include <Windows.h> 

	#pragma once 

	class CULHook 

	{ 

	public: 

	    CULHook(LPSTR lpszModName, LPSTR lpszFuncNme, PROC pfnHook); 

	    ~CULHook(void); 

	    //取消掛鉤 

	    void UnHook(); 

	    //重新掛鉤 

	    void ReHook(); 

	protected: 

	    PROC m_pfnOrig; 

	    BYTE m_btNewBytes[8]; 

	    BYTE m_btOldBytes[8]; 

	    HMODULE m_hModule; 

	}; 

	#endif

.cpp源文件如下：

復制代碼代碼如下:

	#include "ULHook.h" 

	CULHook::CULHook(LPSTR lpszModName, LPSTR lpszFuncNme, PROC pfnHook) 

	{ 

	    BYTE btNewBytes[] = {0xB8, 0x00, 0x00,0x40,0x00,0xFF,0xE0,0x00}; 

	    memcpy(m_btNewBytes, btNewBytes, 8); 

	    *(DWORD*)(m_btNewBytes+1) = (DWORD)pfnHook; 

	    m_hModule = ::LoadLibraryA(lpszModName); 

	    if (NULL == m_hModule) 

	    { 

	        m_pfnOrig = NULL; 

	        return; 

	    } 

	    m_pfnOrig = (PROC)::GetProcAddress(m_hModule, lpszFuncNme); 

	    if (NULL != m_pfnOrig) 

	    { 

	        MEMORY_BASIC_INFORMATION mbi = {0}; 

	        DWORD dwOldProtect; 

	        ::VirtualQuery(m_pfnOrig, &mbi, sizeof(mbi)); 

	        ::VirtualProtect(m_pfnOrig, 8, PAGE_READWRITE, &dwOldProtect); 

	        memcpy(m_btOldBytes, m_pfnOrig, 8); 

	        ::WriteProcessMemory(GetCurrentProcess(), (VOID*)m_pfnOrig, m_btNewBytes, 8, NULL); 

	        ::VirtualProtect(m_pfnOrig, 8, dwOldProtect, NULL); 

	    } 

	} 

	CULHook::~CULHook(void) 

	{ 

	    UnHook(); 

	    if (m_hModule!=NULL) 

	    { 

	        ::FreeLibrary(m_hModule); 

	    } 

	} 

	void CULHook::UnHook() 

	{ 

	    if (m_pfnOrig != NULL) 

	    { 

	        MEMORY_BASIC_INFORMATION mbi = {0}; 

	        DWORD dwOldProtect; 

	        ::VirtualQuery(m_pfnOrig, &mbi, sizeof(mbi)); 

	        ::VirtualProtect(m_pfnOrig, 8, PAGE_READWRITE, &dwOldProtect); 

	        ::WriteProcessMemory(GetCurrentProcess(), (VOID*)m_pfnOrig, m_btOldBytes, 8, NULL); 

	        ::VirtualProtect(m_pfnOrig, 8, dwOldProtect, NULL); 

	    } 

	} 

	void CULHook::ReHook() 

	{ 

	    if (m_pfnOrig != NULL) 

	    { 

	        MEMORY_BASIC_INFORMATION mbi = {0}; 

	        DWORD dwOldProtect; 

	        ::VirtualQuery(m_pfnOrig, &mbi, sizeof(mbi)); 

	        ::VirtualProtect(m_pfnOrig, 8, PAGE_READWRITE, &dwOldProtect); 

	        ::WriteProcessMemory(GetCurrentProcess(), (VOID*)m_pfnOrig, m_btNewBytes, 8, NULL); 

	        ::VirtualProtect(m_pfnOrig, 8, dwOldProtect, NULL); 

	    } 

	}