Hook任务管理器SendMessageW问题

环境 windows7 + VS2008
以下为dll代码。我hook两个函数TerminateProcess与预期结果一样,SendMessageW时taskmgr.exe老是崩溃
高手看下是为啥，最好亲手调试一下，再得结论
////
//本程序hook任务管器的TerminateProcess,SendMessageW
//一般不hook SendMessageW因为消息一多且MySendMessageW代码又多的情况就会失去响应..
#include <windows.h>
#include <stdio.h>
HANDLE hEvent;
DWORD IATAddr[2];
DWORD RealAddr[2];
DWORD MyApi[2];
DWORD WINAPI ThreadProc(LPVOID lpParameter);
BOOL IAThook(TCHAR DllName[], TCHAR FunName[], DWORD MyFunAddr, int nAPI);
BOOL WINAPI MyTerminateProcess(HANDLE hProcess, UINT uExitCode);
LRESULT WINAPI MySendMessage(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
void ShowError();
BOOL APIENTRY DllMain( HMODULE hModule, DWORD Reason, LPVOID lpReserved)
{
switch (Reason)
{
case DLL_PROCESS_ATTACH:
{
HANDLE hThread = ::CreateThread(NULL, 0, ThreadProc, NULL, 0, NULL);
if (hThread == NULL)
{
ShowError();
return FALSE;
}
}break;
case DLL_THREAD_ATTACH:break;
case DLL_THREAD_DETACH:break;
case DLL_PROCESS_DETACH:break;
}
return TRUE;//返回TRUE表示DLL允许被加载。LoadLibrary将返回hModule的值
}

DWORD WINAPI ThreadProc(LPVOID lpParameter)
{
//hEvent = ::CreateEvent(NULL, FALSE, TRUE, "Rookit");
// if (hEvent == NULL)
// {
// ShowError();
// }
MyApi[0] = (DWORD)MyTerminateProcess;
MyApi[1] = (DWORD)MySendMessage;
if (!IAThook("KERNEL32.dll", "TerminateProcess", MyApi[0], 0))
{
return 0;
}
if (!IAThook("USER32.dll", "SendMessageW", MyApi[1], 1))
{
return 0;
}
return 1;
}
BOOL IAThook(TCHAR DllName[], TCHAR FunName[], DWORD MyFunAddr, int nAPI)
{
LPVOID pMap = GetModuleHandle(NULL);
IMAGE_DOS_HEADER *pMZ = (IMAGE_DOS_HEADER *)pMap;
IMAGE_NT_HEADERS *pPE = (IMAGE_NT_HEADERS *)((LPBYTE)pMap + pMZ->e_lfanew);
IMAGE_DATA_DIRECTORY *pDirectory;
pDirectory = &pPE->OptionalHeader.DataDirectory[1]; //第二成员为导入表
IMAGE_IMPORT_DESCRIPTOR *pDescriptor; //指向DLL相关信息
//pIDescriptor指向DLL信息的IMAGE_IMPORT_DESCRIPTOR数组,以全0成员结束
pDescriptor = (IMAGE_IMPORT_DESCRIPTOR *)((LPBYTE)pMZ + pDirectory->VirtualAddress);
IMAGE_THUNK_DATA * pData;
DWORD * pAddr; //函数在进程中加载地址
IMAGE_IMPORT_BY_NAME *pName;
while (pDescriptor->OriginalFirstThunk) //PE未加载前FirstThunk与OriginalFIrstThunk功能一样
{
if (strcmp(DllName, (char *)(LPBYTE(pMZ) + pDescriptor->Name)) == 0)
{
//cout << "找到指定DLL!" << endl;
pData = (IMAGE_THUNK_DATA *) ((LPBYTE)pMZ + pDescriptor->OriginalFirstThunk);
pAddr = (DWORD *) ((LPBYTE)pMZ + pDescriptor->FirstThunk);
while (pData ->u1.AddressOfData)
{
pName = (IMAGE_IMPORT_BY_NAME *) ((LPBYTE)pMZ + pData->u1.AddressOfData);
if (strcmp(FunName, (char*)pName->Name) == 0)
{
//cout << "找到指定API函数!" << endl;
IATAddr[nAPI] = (DWORD)pAddr; //指向[__jmp API@n]这一句路过jmp(e9)的地址
RealAddr[nAPI] = *pAddr; //上面地址的内容
if (!::WriteProcessMemory(GetCurrentProcess(), pAddr, &MyFunAddr, 4, NULL ))
{
//ShowError();
::MessageBoxW(NULL, L"找到指定DLL与API,但写入内存时出错!", L"提示", MB_OK);
return FALSE;
}
::MessageBoxW(NULL, L"修改成功!", L"提示", MB_ICONINFORMATION);
return TRUE;
}
pData++;
pAddr++;
}
::MessageBoxW(NULL, L"找到指定DLL但没发现指定导入函数!", L"提示!", MB_OK);
return FALSE;
}
pDescriptor++;
}
::MessageBoxW(NULL, L"没发现指定DLL", L"提示!", MB_OK);
return FALSE;
}

BOOL WINAPI MyTerminateProcess(HANDLE hProcess, UINT uExitCode)
{
if (!::WriteProcessMemory(GetCurrentProcess(), (LPVOID)IATAddr[0], &RealAddr[0], 4, NULL ))
{
//ShowError();
::MessageBoxW(NULL, L"写入内存出错!", L"提示", MB_OK);
return FALSE ;
}
::MessageBoxA(NULL, "系统正调用TerminateProcess杀进程,但被阻止了!", "HOOK", MB_ICONINFORMATION);
//这边可调用真正的TerminateProcess()
//::TerminateProcess(hProcess, uExitCode);
if (!::WriteProcessMemory(GetCurrentProcess(), (LPVOID)IATAddr[0], &MyApi[0], 4, NULL ))
{
//ShowError();
::MessageBoxW(NULL, L"写入内存出错!", L"提示", MB_OK);
return FALSE;
}
return TRUE;
}
LRESULT WINAPI MySendMessage(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
// if (::WaitForSingleObject(hEvent, INFINITE) == WAIT_FAILED)
// {
// ShowError();
//::ExitProcess(0xff);
//}
char buff[0xff] = {0};
if (!::WriteProcessMemory(GetCurrentProcess(), (LPVOID)IATAddr[1], &RealAddr[1], 4, NULL ))
{
//ShowError();
::MessageBoxW(NULL, L"写入内存出错!", L"提示", MB_OK);
return NULL ;
}

// if (Msg == WM_CLOSE)
//{
//::MessageBoxA(NULL, "目标正发送WM_CLOSE", "HOOK", 0);
// }
::SendMessageW(hWnd, Msg, wParam, lParam);
if (!::WriteProcessMemory(GetCurrentProcess(), (LPVOID)IATAddr[1], &MyApi[1], 4, NULL ))
{
//ShowError();
::MessageBoxW(NULL, L"写入内存出错!", L"提示", MB_OK);
return NULL;
}
// if(!::SetEvent(hEvent))//通知状态
// {
// ShowError();
///::ExitProcess(0xff);
// }
return 1234;
}
void ShowError()
{
LPTSTR lpMsgBuf;
::FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
::GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpMsgBuf,
0,
NULL);
::MessageBox(NULL, lpMsgBuf, NULL, MB_OK | MB_ICONSTOP);
::LocalFree(lpMsgBuf);//释放操作系统开辟的缓冲区地址
}