C++实现txt文件传输 上

思路：

socket建立连接。然后把文件读进char*buffer。

把buffer传输完。接收到以后复原。

今天弄了一天。暂时就弄出来了txt格式。EXCEL和图片那些都没搞明白。

放个今天的马。这个是接收端。

Server.h

#define _WINSOCK_DEPRECATED_NO_WARNINGS 
#ifndef _SERVER_H
#define _SERVER_H
#include <fstream>
#include <iostream>
#include <string>
#include <thread>
#include <WinSock2.h>
#pragma  comment(lib,"ws2_32.lib")
SOCKET cl[4];
using namespace std;
class Server
{
public:Server();
     ~Server();
     void SocketInit();
     void SetConnect();
     static void TaskThread(int id);
     
private:
  SOCKET s;
  SOCKET cnfd;
    
};


#endif //_SERVER_H
#include "Server.h"
Server::Server(){

  WSADATA wsadata;
  WORD ver = MAKEWORD(2, 2);
  if (::WSAStartup(ver, &wsadata) < 0)
  {

    exit(0);
  }
  
  for (int i = 0; i < 4; i++)
    cl[i] = -1;
}

Server::~Server()
{
  ::WSACleanup();


}
void Server::SocketInit(){

  s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  sockaddr_in sin;
  sin.sin_family = AF_INET;
  sin.sin_port = htons(4567);
  sin.sin_addr.S_un.S_addr = inet_addr("192.168.1.3");

  if (::bind(s, (LPSOCKADDR)&sin, sizeof(sin))==SOCKET_ERROR)
  {
    return;
  }
  if (::listen(s, 5) == SOCKET_ERROR)
  {

    return;
  }

};
void Server::SetConnect(){
  cout << "NoBody" << endl;
  while (1)
  {
    cnfd = 0;
    sockaddr_in re;
    int n = sizeof(re);
    cnfd = ::accept(s, (SOCKADDR*)&re, &n);
    if (cnfd == INVALID_SOCKET)
    {
      return;
    }
    int ONE = 0;
    int i;
    for ( i = 0; i < 4; i++)
    {
      if (cl[i] == -1)
      {
        ONE = 1;
        break;
      }
    }
    if (ONE)
    {
      cl[i] = cnfd;
      cnfd = 0;
      thread t(TaskThread,i);
      t.detach();
    }
    else
    {
      char sorry[8] = "wait...";
      ::send(cnfd, sorry, 8, 0);
    }
  }
  closesocket(s);
  

};
void Server::TaskThread(int id)
{
  int num = 0;
  char hello[] = "hello";
  ::send(cl[id], hello, 6, 0);
  ofstream out("1.txt", ios_base::binary | ios_base::out|ios::app);
  char buf[255];
  int nR;
  while ((nR = ::recv(cl[id], buf, 256, 0))>0)
  {
    
    cout << ++num << endl;
    cout << "nR is " << nR << endl;
      if (out.is_open())
      {
        cout << "gGGGGGGg" << endl;
        out.write((char*)buf,nR);
        cout << endl;
      }
      ::send(cl[id],buf,nR, 0);
      
      //nR = ::recv(cl[id], buf, 256, 0);
  }
  
  if (out.is_open())
  out.close();
  closesocket(cl[id]);
  cl[id] = -1;
  ifstream in("1.txt");
  char buuf[255];
  if (in.is_open())
  {
    in.getline(buuf, 10);
    in.close();
  }

  cout << buuf << endl;
  cin.get();

};
int main()
{
  Server sver;
  sver.SocketInit();
  sver.SetConnect();



  
}