正在阅读：VC++高级学习:监视服务器端口VC++高级学习:监视服务器端口

  #include "stdafx.h"
  #include <winsock2.h>
  #include <windows.h>
  //#include <stdio.h>
  #include <stdlib.h>
  #include <fstream.h>

  DWORD WINAPI ClientThread(LPVOID lpParam);

  int main(int argc, char* argv[])
  {
   if (argc!=2)
  {
  printf("using: listen [your ip address]\nfor example:\n  listen 202.112.246.2\n");
  return 0;
   }

    WORD wVersionRequested;
    DWORD ret;
    WSADATA wsaData;
    BOOL val;
    SOCKADDR_IN saddr;
    SOCKADDR_IN scaddr;
    int err;
    SOCKET s;
    SOCKET sc;
    int caddsize;
    HANDLE mt;
    DWORD tid;

    wVersionRequested = MAKEWORD( 2, 2 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if ( err != 0 ) {
        printf("error!WSAStartup failed!\n");
        return -1;
    }
    saddr.sin_family = AF_INET;

    //截听虽然也可以将地址指定为INADDR_ANY，但是要不能影响正常应用情况下，应该指定具体的IP，留下127.0.0.1给正常的服务应用，然后利用这个地址进行转发，就可以不影响对方正常应用了
    saddr.sin_addr.s_addr = inet_addr(argv[1]);    
    saddr.sin_port = htons(80);
    if((s=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==SOCKET_ERROR)
    {
        printf("error!socket failed!\n");
        return -1;
    }
    val = TRUE;