基于VC++开发InlineHook网络数据发送接收函数
大家都懂，很多时候开发项目需要修改网络数据，代码如下，请柬代码分析
#include "stdafx.h"
#include <stdio.h>
#include <Windows.h>
#include <Winsock2.h>
#ifdef _MANAGED
#pragma managed(push, off)
#endif
#define HOOK_API extern "C" _declspec(dllexport)
//本dll的handle
HANDLE g_hInstance = NULL;
//修改API入口为 mov eax, 00400000;jmp eax是程序能跳转到自己的函数
BYTE g_btNewBytes[8] = { 0xB8, 0x0, 0x0, 0x40, 0x0, 0xFF, 0xE0, 0x0 };
//保存原API入口的8个字节
DWORD g_dwOldBytes[2][2] = { 0x0, 0x0, 0x0, 0x0 };
//钩子句柄
HHOOK g_hOldHook = NULL;
//API中send函数的地址
DWORD g_pSend = 0;
DWORD g_pRecv = 0;
//事务，解决同步问题
HANDLE g_hSendEvent = NULL;
HANDLE g_hRecvEvent = NULL;
//自己的send函数地址，参数必须与API的send函数地址相同
int _stdcall hook_send( SOCKET s, const char *buf, int len, int flags );
int _stdcall hook_recv(IN SOCKET s,OUT char FAR * buf,IN int len,IN int flags );
//要Hook的进程和主线程ID号
DWORD g_dwProcessID = 0;
DWORD g_dwThreadID = 0;
// 如果是win9x，不能使用fopen函数
void WriteLog(char *fmt,...)
{
va_list args;
char modname[200];
char temp[5000];
HANDLE hFile;
SYSTEMTIME loaclTime;
GetLocalTime(&loaclTime);
GetModuleFileName(NULL, modname, sizeof(modname));
if((hFile =CreateFile("c:\\hookapi.log", GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) <0)
{
return;
}
SetFilePointer(hFile, 0, NULL, FILE_END);
wsprintf(temp, "%d:%d:%d mydll.dll:%s:", loaclTime.wHour,loaclTime.wMinute,loaclTime.wMilliseconds, modname);
DWORD dw;
WriteFile(hFile, temp, strlen(temp), &dw, NULL);
va_start(args,fmt);
vsprintf(temp, fmt, args);
va_end(args);
WriteFile(hFile, temp, strlen(temp), &dw, NULL);
wsprintf(temp, "\r\n");
WriteFile(hFile, temp, strlen(temp), &dw, NULL);
CloseHandle(hFile);
}
int _stdcall hook_recv(IN SOCKET s,OUT char FAR * buf,IN int len,IN int flags )
{
int nRet;
WaitForSingleObject( g_hRecvEvent, INFINITE );
//恢复API头8个字节
WriteProcessMemory( INVALID_HANDLE_VALUE, ( void* )g_pRecv,( void* )g_dwOldBytes[0], sizeof( DWORD )*2, NULL );
/*
这里可以添加想要进行的处理过程
*/
//真正执行API函数
nRet = recv( s, buf, len, flags );
//写入跳转语句，继续Hook
WriteProcessMemory( INVALID_HANDLE_VALUE, ( void* )g_pRecv,( void* )g_btNewBytes, sizeof( DWORD )*2, NULL);
WriteLog("%s",buf);
SetEvent( g_hRecvEvent );
return nRet;
}
int _stdcall hook_send( SOCKET s, const char *buf, int len, int flags )
{
int nRet;
WaitForSingleObject( g_hSendEvent, INFINITE );
//恢复API头8个字节
WriteProcessMemory( INVALID_HANDLE_VALUE, ( void* )g_pSend,
( void* )g_dwOldBytes[0], sizeof( DWORD )*2, NULL );
/*
这里可以添加想要进行的处理过程
*/
WriteLog("Send:%s",buf);
//真正执行API函数
nRet = send( s, buf, len, flags );
//写入跳转语句，继续Hook
WriteProcessMemory( INVALID_HANDLE_VALUE, ( void* )g_pSend,
( void* )g_btNewBytes, sizeof( DWORD )*2, NULL );
SetEvent( g_hSendEvent );
return nRet;
}
static LRESULT WINAPI HookProc( int nCode, WPARAM wParam, LPARAM lParam )
{
return CallNextHookEx( g_hOldHook, nCode, wParam, lParam );
}
HOOK_API BOOL StartHook(HWND hWnd)
{
//通过传入的窗口句柄获取线程句柄
g_dwThreadID = GetWindowThreadProcessId( hWnd, &g_dwProcessID );
//WH_CALLWNDPROC类型的Hook
g_hOldHook = SetWindowsHookEx( WH_CALLWNDPROC, HookProc,( HINSTANCE ) g_hInstance, g_dwThreadID );
if( g_hOldHook == NULL )
return FALSE;
return TRUE;
}
HOOK_API void StopHook(void)
{
if(g_hOldHook != NULL)
{
WaitForSingleObject( g_hSendEvent, INFINITE );
HANDLE hProcess = NULL;
hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, g_dwProcessID);
DWORD dwOldProc;
DWORD dwNewProc;
//改变页面属性为读写
VirtualProtectEx( hProcess, ( void* )g_pSend, 8, PAGE_READWRITE, &dwOldProc );
//恢复API的首8个字节
WriteProcessMemory( hProcess, ( void* )g_pSend,
( void* )g_dwOldBytes[0], sizeof( DWORD )*2, NULL );
//恢复页面文件的属性
VirtualProtectEx( hProcess, ( void* )g_pSend, 8, dwOldProc, &dwNewProc );
CloseHandle(g_hSendEvent);
UnhookWindowsHookEx( g_hOldHook );
}
}
DWORD WINAPI ThreadFunc( LPVOID lpParam )
{
char szMsg[80];
wsprintf( szMsg, "Parameter = %d.", *(DWORD*)lpParam );
MessageBox( NULL, szMsg, "ThreadFunc", MB_OK );
while(1) Sleep(1000);
return 0;
}
BOOL APIENTRY DllMain( HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
if(ul_reason_for_call == DLL_PROCESS_ATTACH)
{
WriteLog("Start HOOK");
//获取本dll句柄
g_hInstance = hModule;
//创建事务
g_hSendEvent = CreateEvent( NULL, FALSE, TRUE, NULL );
//重写API开头的8字节
HMODULE hWsock = LoadLibrary( "wsock32.dll" );
g_pSend = ( DWORD )GetProcAddress( hWsock, "send" );
g_pRecv = (DWORD)GetProcAddress( hWsock, "recv" );
//保存原始字节
ReadProcessMemory( INVALID_HANDLE_VALUE, ( void * )g_pSend,( void * )g_dwOldBytes[0], sizeof( DWORD )*2, NULL );
//将00400000改写为我们函数的地址
*( DWORD* )( g_btNewBytes + 1 ) = ( DWORD )hook_send;
WriteProcessMemory( INVALID_HANDLE_VALUE, ( void * )g_pSend,( void * )g_btNewBytes, sizeof( DWORD )*2, NULL );
// //保存原始字节
// ReadProcessMemory( INVALID_HANDLE_VALUE, ( void * )g_pRecv,( void * )g_dwOldBytes[0], sizeof( DWORD )*2, NULL );
// //将00400000改写为我们函数的地址
// *( DWORD* )( g_btNewBytes + 1 ) = ( DWORD )hook_recv;
// WriteProcessMemory( INVALID_HANDLE_VALUE, ( void * )g_pRecv,( void * )g_btNewBytes, sizeof( DWORD )*2, NULL );
DWORD dwThreadId, dwThrdParam = 1;
HANDLE hThread;
char szMsg[80];
hThread = CreateThread(
NULL, // default security attributes
0, // use default stack size
ThreadFunc, // thread function
&dwThrdParam, // argument to thread function
0, // use default creation flags
&dwThreadId); // returns the thread identifier
// Check the return value for success.
if (hThread == NULL)
{
wsprintf( szMsg, "CreateThread failed." );
MessageBox( NULL, szMsg, "main", MB_OK );
}
else
{
CloseHandle( hThread );
}
}
return TRUE;
}
#ifdef _MANAGED
#pragma managed(pop)
#endif #include <Winsock2.h>
//#include <windows.h>
#include <stdio.h>
#include <Tlhelp32.h>
//#pragma argsused
//自定义APIHOOK结构
typedef struct
{
FARPROC funcaddr;
BYTE olddata[5];
BYTE newdata[5];
}HOOKSTRUCT;
HHOOK g_hHook;
HINSTANCE g_hinstDll;
HMODULE hModule ;
HWND g_hForm; //接收信息窗口句柄
DWORD dwIdOld, dwIdNew;
//------------------------------------------------------------------------
// 由于要截获两个库里面的函数,所以每个函数定义了两个HOOK结构
// 一个是wsock32.dll, 一个是ws2_32.dll
//------------------------------------------------------------------------
HOOKSTRUCT recvapi;
HOOKSTRUCT recvapi1;
HOOKSTRUCT sendapi;
HOOKSTRUCT sendapi1;
HOOKSTRUCT sendtoapi;
HOOKSTRUCT sendtoapi1;
HOOKSTRUCT WSASendapi;
HOOKSTRUCT connectapi;
void HookOn();
void HookOff();
BOOL Init();
extern "C" __declspec(dllexport) BOOL __stdcall InstallHook();
extern "C" __declspec(dllexport) BOOL __stdcall UninstallHook();
BOOL hookapi(char *dllname, char *procname, DWORD myfuncaddr, HOOKSTRUCT *hookfunc);
int WINAPI Myrecv(SOCKET s, char FAR *buf, int len, int flags);
int WINAPI Myrecv1(SOCKET s, char FAR *buf, int len, int flags);
int WINAPI Mysend(SOCKET s, char FAR *buf, int len, int flags);
int WINAPI Mysend1(SOCKET s, char FAR *buf, int len, int flags);
int WINAPI Mysendto(SOCKET s, const char FAR * buf, int len,
int flags, const struct sockaddr FAR * to, int tolen);
int WINAPI Mysendto1(SOCKET s, const char FAR * buf, int len,
int flags, const struct sockaddr FAR * to, int tolen);
int WINAPI MyWSASend(
SOCKET s,
LPWSABUF lpBuffers,
DWORD dwBufferCount,
LPDWORD lpNumberOfBytesSent,
DWORD dwFlags,
LPWSAOVERLAPPED lpOverlapped,
LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine
);
int WINAPI Myconnect(SOCKET s,const struct sockaddr* name,int namelen);
void sndmsg(char *buf);
void WriteLog(char *fmt,...);
//---------------------------------------------------------------------------
// 入口函数
// 在一载入库时就进行API截获
// 释放时还原
//---------------------------------------------------------------------------
int WINAPI DllMain(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
//__asm int 3
switch (reason)
{
case DLL_PROCESS_ATTACH:
g_hinstDll = hinst;
g_hForm = FindWindow(NULL, "ZwelL");
InstallHook();
if(!Init())
{
MessageBoxA(NULL,"Init","ERROR",MB_OK);
return(false);
}
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
UninstallHook();
break;
}
return TRUE;
}
//-----------------------------------------------------------------------
BOOL Init()
{
hookapi("wsock32.dll", "recv", (DWORD)Myrecv, &recvapi);
hookapi("ws2_32.dll", "recv", (DWORD)Myrecv1, &recvapi1);
hookapi("wsock32.dll", "send", (DWORD)Mysend, &sendapi);
hookapi("ws2_32.dll", "send", (DWORD)Mysend1, &sendapi1);
hookapi("wsock32.dll", "sendto", (DWORD)Mysendto, &sendtoapi);
hookapi("ws2_32.dll", "sendto", (DWORD)Mysendto1, &sendtoapi1);
hookapi("wsock32.dll", "WSASend", (DWORD)MyWSASend, &WSASendapi);
hookapi("ws2_32.dll", "connect", (DWORD)Myconnect, &connectapi);
//hookapi("wsock32.dll", "connect", (DWORD)Myconnect, &connectapi);
dwIdNew = GetCurrentProcessId(); // 得到所属进程的ID
dwIdOld = dwIdNew;
HookOn(); // 开始拦截
return(true);
}
//---------------------------------------------------------------------------
LRESULT WINAPI Hook(int nCode, WPARAM wParam, LPARAM lParam)
{
return(CallNextHookEx(g_hHook, nCode, wParam, lParam));
}
//---------------------------------------------------------------------------
extern "C" __declspec(dllexport)
BOOL __stdcall InstallHook()
{
g_hHook = SetWindowsHookEx(WH_GETMESSAGE, (HOOKPROC)Hook, g_hinstDll, 0);
if (!g_hHook)
{
MessageBoxA(NULL, "SET ERROR", "ERROR", MB_OK);
return(false);
}
return(true);
}
//---------------------------------------------------------------------------
extern "C" __declspec(dllexport)
BOOL __stdcall UninstallHook()
{
HookOff();
if(g_hHook == NULL)
return true;
return(UnhookWindowsHookEx(g_hHook));
}
//---------------------------------------------------------------------------
// 根据输入结构截获API
//---------------------------------------------------------------------------
BOOL hookapi(char *dllname, char *procname, DWORD myfuncaddr, HOOKSTRUCT *hookfunc)
{
hModule = LoadLibrary(dllname);
hookfunc->funcaddr = GetProcAddress(hModule, procname);
if(hookfunc->funcaddr == NULL)
return false;
memcpy(hookfunc->olddata, hookfunc->funcaddr, 6);
hookfunc->newdata[0] = 0xe9;
DWORD jmpaddr = myfuncaddr - (DWORD)hookfunc->funcaddr - 5;
memcpy(&hookfunc->newdata[1], &jmpaddr, 5);
return true;
}
//---------------------------------------------------------------------------
void HookOnOne(HOOKSTRUCT *hookfunc)
{
HANDLE hProc;
dwIdOld = dwIdNew;
hProc = OpenProcess(PROCESS_ALL_ACCESS, 0, dwIdOld);
VirtualProtectEx(hProc, hookfunc->funcaddr, 5, PAGE_READWRITE,&dwIdOld);
WriteProcessMemory(hProc, hookfunc->funcaddr, hookfunc->newdata, 5, 0);
VirtualProtectEx(hProc, hookfunc->funcaddr, 5, dwIdOld, &dwIdOld);
}
//---------------------------------------------------------------------------
void HookOn()
{
// HookOnOne(&recvapi);
// HookOnOne(&sendapi);
// HookOnOne(&sendtoapi);
// HookOnOne(&recvapi1);
// HookOnOne(&sendapi1);
// HookOnOne(&sendtoapi1);
// HookOnOne(&WSASendapi);
HookOnOne(&connectapi);
}
//---------------------------------------------------------------------------
void HookOffOne(HOOKSTRUCT *hookfunc)
{
HANDLE hProc;
dwIdOld = dwIdNew;
hProc = OpenProcess(PROCESS_ALL_ACCESS, 0, dwIdOld);
VirtualProtectEx(hProc, hookfunc->funcaddr,5, PAGE_READWRITE, &dwIdOld);
WriteProcessMemory(hProc, hookfunc->funcaddr, hookfunc->olddata, 5, 0);
VirtualProtectEx(hProc, hookfunc->funcaddr, 5, dwIdOld, &dwIdOld);
}
//---------------------------------------------------------------------------
void HookOff()
{
// HookOffOne(&recvapi);
// HookOffOne(&sendapi);
// HookOffOne(&sendtoapi);
// HookOffOne(&recvapi1);
// HookOffOne(&sendapi1);
// HookOffOne(&sendtoapi1);
// HookOffOne(&WSASendapi);
HookOffOne(&connectapi);
}
//---------------------------------------------------------------------------
int WINAPI Myrecv(SOCKET s, char FAR *buf, int len, int flags)
{
int nReturn;
HookOffOne(&recvapi);
nReturn = recv(s, buf, len, flags);
HookOnOne(&recvapi);
char *tmpbuf=new char[len+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "recv|%d|%d|%s",
GetCurrentProcessId(),
len,
buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//---------------------------------------------------------------------------
int WINAPI Myrecv1(SOCKET s, char FAR *buf, int len, int flags)
{
int nReturn;
HookOffOne(&recvapi1);
nReturn = recv(s, buf, len, flags);
HookOnOne(&recvapi1);
char *tmpbuf=new char[len+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "recv1|%d|%d|%s",
GetCurrentProcessId(),
len,
buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//---------------------------------------------------------------------------
int WINAPI Mysend(SOCKET s, char FAR *buf, int len, int flags)
{
int nReturn;
HookOffOne(&sendapi);
nReturn = send(s, buf, len, flags);
HookOnOne(&sendapi);
char *tmpbuf=new char[len+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "send|%d|%d|%s",
GetCurrentProcessId(),
len,
buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//---------------------------------------------------------------------------
int WINAPI Mysend1(SOCKET s, char FAR *buf, int len, int flags)
{
int nReturn;
HookOffOne(&sendapi1);
nReturn = send(s, buf, len, flags);
HookOnOne(&sendapi1);
char *tmpbuf=new char[len+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "send1|%d|%d|%s",
GetCurrentProcessId(),
len,
buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//--------------------------------------------------------------------------
int WINAPI Mysendto(SOCKET s, const char FAR * buf, int len,
int flags, const struct sockaddr FAR * to, int tolen)
{
int nReturn;
HookOffOne(&sendtoapi);
nReturn = sendto(s, buf, len, flags, to, tolen);
HookOnOne(&sendtoapi);
char *tmpbuf=new char[len+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "sendto|%d|%d|%s",
GetCurrentProcessId(),
len,
buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//--------------------------------------------------------------------------
int WINAPI Mysendto1(SOCKET s, const char FAR * buf, int len,
int flags, const struct sockaddr FAR * to, int tolen)
{
int nReturn;
HookOffOne(&sendtoapi1);
nReturn = sendto(s, buf, len, flags, to, tolen);
HookOnOne(&sendtoapi1);
char *tmpbuf=new char[len+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "sendto1|%d|%d|%s",
GetCurrentProcessId(),
len,
buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//----------------------------------------------------------------------------
int WINAPI MyWSASend(
SOCKET s,
LPWSABUF lpBuffers,
DWORD dwBufferCount,
LPDWORD lpNumberOfBytesSent,
DWORD dwFlags,
LPWSAOVERLAPPED lpOverlapped,
LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine
)
{
int nReturn;
HookOffOne(&WSASendapi);
nReturn = WSASend(s, lpBuffers, dwBufferCount,
lpNumberOfBytesSent, dwFlags, lpOverlapped, lpCompletionRoutine);
HookOnOne(&WSASendapi);
char *tmpbuf=new char[*lpNumberOfBytesSent+100];
memset(tmpbuf, 0, sizeof(tmpbuf));
sprintf(tmpbuf, "WSASend|%d|%d|%s",
GetCurrentProcessId(),
lpNumberOfBytesSent,
lpBuffers->buf);
sndmsg(tmpbuf);
delete tmpbuf;
return(nReturn);
}
//---------显示进程的模块
bool GetListModules(DWORD dwPID,char* ModuleName,ULONG uAddress)
{
HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
MODULEENTRY32 me32;
BOOL bRet = FALSE;
// Take a snapshot of all modules in the specified process.
hModuleSnap = CreateToolhelp32Snapshot( TH32CS_SNAPMODULE, dwPID );
if( hModuleSnap == INVALID_HANDLE_VALUE )
{
//MessageBox(NULL,"CreateToolhelp32Snapshot error"),"提示",MB_OK);
return FALSE;
}
// Set the size of the structure before using it.
me32.dwSize = sizeof( MODULEENTRY32);
// Retrieve information about the first module,
// and exit if unsuccessful
if( !Module32First( hModuleSnap, &me32 ) )
{
//MessageBox(NULL,_T("Module32First error"),"提示",MB_OK);
CloseHandle( hModuleSnap ); // Must clean up the snapshot object!
return( FALSE );
}
// Now walk the module list of the process,
// and display information about each module
//因为我只需要得到exe文件的路径,所以这个循环不要
do
{
//----下面这两个地方的显示结果是一样的，有中文字符就显示为 ?
//MessageBox(NULL,me32.szExePath,"提示",MB_OK); //弹出窗口显示exe文件的路径
//m_edit.SetWindowText(me32.szExePath); //edit控件中显示exe文件的路径
// BYTE* pMem = new BYTE[me32.modBaseSize];
// if(GetProcessMem(dwPID,(DWORD)me32.modBaseAddr,me32.modBaseSize,pMem))
// {
// if(GetProcessFunction(pMem) == 0)
// printf("%s\n",me32.szExePath);
// }
// delete[] pMem;
if( uAddress >= (ULONG)me32.modBaseAddr && (uAddress = (ULONG)me32.modBaseAddr + me32.modBaseSize))
{
strcpy(ModuleName,me32.szExePath);
bRet = TRUE;
break;
}
}
while( Module32Next( hModuleSnap, &me32 ) );
CloseHandle( hModuleSnap );
return bRet;
}
int WINAPI Myconnect(
SOCKET s,
const struct sockaddr* name,
int namelen
)
{
ULONG rEbp;
__asm
{
mov rEbp,ebp
}
ULONG uAddress = *(ULONG*)(rEbp + 4); //获取调用堆榨地址
char szMsg[MAX_PATH]={0};
if(GetListModules(GetCurrentProcessId(),szMsg,uAddress))
WriteLog(szMsg);
SOCKADDR_IN* destSockAddr;
destSockAddr = (SOCKADDR_IN *)name;
sprintf(szMsg,"0x%x,%s:%d",destSockAddr->sin_family, inet_ntoa(destSockAddr->sin_addr),destSockAddr->sin_port);
WriteLog(szMsg);
int nReturn;
HookOffOne(&connectapi);
nReturn = connect(s,name,namelen);
HookOnOne(&connectapi);
return nReturn;
}
__declspec(naked) int WINAPI Myconnect1(
SOCKET s,
const struct sockaddr* name,
int namelen
)
{
//int nReturn;
//HookOffOne(&connectapi);
__asm
{
mov edi,edi
push ebp
mov ebp,esp
push 0x71a24a0c
ret
}
// connect(s,name,namelen);
// HookOnOne(&connectapi);
//
// char szMsg[MAX_PATH];
// sprintf(szMsg,"%x",name->sa_data);
// WriteLog(szMsg);
// return ;
}
//-----------------------------------------------------------------
// 向窗口发送消息
// 考虑到简单性,用了COPYDATASTRUCT结构
// 用内存映射应该会快一点
//-----------------------------------------------------------------
void sndmsg(char *buf)
{
COPYDATASTRUCT cds;
cds.dwData=sizeof(COPYDATASTRUCT);
cds.cbData=strlen(buf);
cds.lpData=buf;
SendMessage(g_hForm,WM_COPYDATA,(WPARAM)NULL,(LPARAM)&cds);
}
static char s_szMessageBuf[5000];
void WriteLog(char *fmt,...)
{
va_list args;
char modname[200];
HANDLE hFile;
SYSTEMTIME loaclTime;
GetLocalTime(&loaclTime);
GetModuleFileName(NULL, modname, sizeof(modname));
if((hFile =CreateFile("c:\\hookConnect.log", GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL)) <0)
{
return;
}
SetFilePointer(hFile, 0, NULL, FILE_END);
wsprintf(s_szMessageBuf, "%d:%d:%d :%s:", loaclTime.wHour,loaclTime.wMinute,loaclTime.wMilliseconds, modname);
DWORD dw;
WriteFile(hFile, s_szMessageBuf, strlen(s_szMessageBuf), &dw, NULL);
va_start(args,fmt);
vsprintf(s_szMessageBuf, fmt, args);
va_end(args);
WriteFile(hFile, s_szMessageBuf, strlen(s_szMessageBuf), &dw, NULL);
wsprintf(s_szMessageBuf, "\r\n");
WriteFile(hFile, s_szMessageBuf, strlen(s_szMessageBuf), &dw, NULL);
CloseHandle(hFile);
} 
