用HOOK OpenProcess实现不能被终止的程序

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以下是部分程序，在VC++6.0 Plat SDK 2003 SP1下编译通过 #include <windows.h>
#include "APIHook.h"
extern CAPIHook g_OpenProcess;
// 自定义TerminateProcess函数
#pragma data_seg("YCIShared")
HHOOK g_hHook = NULL;
DWORD dwCurrentProcessId=0;
#pragma data_seg()
HANDLE WINAPI Hook_OpenProcess(DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwProcessId)
{
typedef HANDLE (WINAPI *PFNTERMINATEPROCESS)(DWORD, BOOL,DWORD);

if(dwProcessId != dwCurrentProcessId)
{
return ((PFNTERMINATEPROCESS)(PROC)g_OpenProcess)(dwDesiredAccess,bInheritHandle,dwProcessId);
}
return 0;
}

// 挂钩TerminateProcess函数
CAPIHook g_OpenProcess("kernel32.dll", "OpenProcess",
(PROC)Hook_OpenProcess);

///////////////////////////////////////////////////////////////////////////

static HMODULE ModuleFromAddress(PVOID pv)
{
MEMORY_BASIC_INFORMATION mbi;
if(::VirtualQuery(pv, &mbi, sizeof(mbi)) != 0)
{
return (HMODULE)mbi.AllocationBase;
}
else
{
return NULL;
}
}
static LRESULT WINAPI GetMsgProc(int code, WPARAM wParam, LPARAM lParam)
{
return ::CallNextHookEx(g_hHook, code, wParam, lParam);
}
BOOL WINAPI SetSysHook(BOOL bInstall, DWORD dwThreadId)
{
BOOL bOk;
dwCurrentProcessId=dwThreadId;
if(bInstall)
{
g_hHook = ::SetWindowsHookEx(WH_GETMESSAGE, GetMsgProc,
ModuleFromAddress(GetMsgProc), 0);
bOk = (g_hHook != NULL);
}
else
{
bOk = ::UnhookWindowsHookEx(g_hHook);
g_hHook = NULL;
}
return bOk;
}