最近在写一个windows下MT4平台的通信程序，其实也就是利用dll与服务端通信：

service：服务器端是接受MT4端的订单信息并解析放在界面上显示：

代码：service.cpp

#define WIN32_LEAN_AND_MEAN
#include "service.h"
#include "qtablewidget.h"
int n = -1;
user use[100];
char recvbuf[DEFAULT_BUFLEN];
void oop(int num)
{
 int i;
 for( i = num;i<n;i++)
 {
  use[i] = use[i+1];
  use[i].c = use[i].c-1;
 }
} 
void op(int num)
{
 int num1 = n;
 while(num1-->-1)
 {
  if(use[num1].c == num)
  {
   oop(num1);
   n--;
  }
 }
}
int search(int s)
{
 int i = 0;
 while(use[i].t!=0&&i<=n)
 {
  if(s == use[i].t)
   return use[i].c;
  i++;
 }
 return -1;
}
int  socket_main(QTableWidget* p)
{
 WSADATA wsaData;
 int iResult;

 SOCKET ListenSocket = INVALID_SOCKET;
 SOCKET ClientSocket[64];
 for(int i = 0;i<64;i++)ClientSocket[i]= INVALID_SOCKET;
 SOCKET connfd  = INVALID_SOCKET;

 struct addrinfo *result = NULL;
 struct addrinfo hints;

 fd_set global_rdfs,current_rdfs;
 int maxfd,i,d = 0;
 int iSendResult;
 int  recvbuflen = DEFAULT_BUFLEN;
 printf("from server:\n");
 iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
 if (iResult != 0) {
  printf("WSAStartup failed with error: %d\n", iResult);
  return 1;
 }
 ZeroMemory(&hints, sizeof(hints));
 hints.ai_family = AF_INET;
 hints.ai_socktype = SOCK_STREAM;
 hints.ai_protocol = IPPROTO_TCP;
 hints.ai_flags = AI_PASSIVE;
 // Resolve the server address and port
 iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);
 if ( iResult != 0 ) {
  printf("getaddrinfo failed with error: %d\n", iResult);
  WSACleanup();
  return 1;
 }
 // Create a SOCKET for connecting to server
 ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
 if (ListenSocket == INVALID_SOCKET) {
  printf("socket failed with error: %ld\n", WSAGetLastError());
  freeaddrinfo(result);
  WSACleanup();
  return 1;
 }
 // Setup the TCP listening socket
 iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);
 if (iResult == SOCKET_ERROR) {
  printf("bind failed with error: %d\n", WSAGetLastError());
  freeaddrinfo(result);
  closesocket(ListenSocket);
  WSACleanup();
  return 1;
 }
 freeaddrinfo(result);

 iResult = listen(ListenSocket, 64);
 if (iResult == SOCKET_ERROR) {
  printf("listen failed with error: %d\n", WSAGetLastError());
  closesocket(ListenSocket);
  WSACleanup();
  return 1;
 }
 FD_ZERO(&global_rdfs);
 FD_SET(ListenSocket,&global_rdfs);
 maxfd = ListenSocket; 
 do {
  current_rdfs = global_rdfs;
  if(select(maxfd+1,&current_rdfs,NULL,NULL,0) < 0)
  {
   perror("select error");
   exit(-1);
  }
  
  for(i=0;i<=maxfd;i++)
  {
   if(FD_ISSET(i,&current_rdfs))
   {
    if(i == ListenSocket)
    {
     ClientSocket[d] = accept(ListenSocket, NULL, NULL);
     if (ClientSocket[d] == INVALID_SOCKET) {
      printf("accept failed with error: %d\n", WSAGetLastError());
      closesocket(ListenSocket);
      WSACleanup();
      return 1;
     }
     FD_SET(ClientSocket[d],&global_rdfs);
     maxfd = maxfd>ClientSocket[d]?maxfd:ClientSocket[d];
     printf("maxfd=%d",maxfd);
     d++;
    
    }
    else
    {
     if((iResult = recv(i, recvbuf, recvbuflen, 0))<=0)
     {
      perror("recv error");
     }
     else
     {
      show_massage(recvbuf,p);
      }
     }
     }
   }  

 } while (1);
 for(int i = 0;i<64;i++)
 {
  if(ClientSocket[i] != INVALID_SOCKET){
  iResult = shutdown(ClientSocket[i], SD_SEND);
  if (iResult == SOCKET_ERROR) {
   printf("shutdown failed with error: %d\n", WSAGetLastError());
   closesocket(ClientSocket[i]);
   WSACleanup();
  }
  closesocket(ClientSocket[i]);
  }
 }
 closesocket(ListenSocket);
 WSACleanup();
 return 0;
}
void show_massage(char* buf,QTableWidget* p)
{
 int row = p->columnCount();
 int num;
 int c = 0;
 int ret = 0;
 char *numch,*p1,*p2;
 strcpy(p1,strtok(buf,":"));
 strcpy(numch,strtok(NULL,":"));
 if(*p1 == '@')
 {
  p->removeRow(search(atoi(numch)));
  op(search(atoi(numch)));
 }
 else
 {
  if((ret = search(atoi(numch)))==-1)
  {
   n++;
   c = n;
   p->insertRow(n);
   use[n].t = atoi(numch);
   use[n].c = n;
  }
  else
  {
   c = ret;
  }
   p->setItem(c,0,new QTableWidgetItem(p1));
   p->setItem(c,1,new QTableWidgetItem(numch));  
   p->setItem(c,2,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,3,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,4,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,5,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,6,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,7,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,8,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,9,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,10,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,11,new QTableWidgetItem(strtok(NULL,":")));
   p->setItem(c,12,new QTableWidgetItem(strtok(NULL,":")));
 }

}

由于时间问题，程序有点繁琐，不够精简。大神路过不要见笑。。。。。