C++txt文件传输 下

这个是发送端。

思路：

文件小就1次传。大了就分开传。

.h

#define _WINSOCK_DEPRECATED_NO_WARNINGS 
#ifndef _H_H__
#define _H_H__
#include <iostream>
#include <WinSock2.h>
#include <string>
#include <fstream>
#include <thread>
#pragma comment (lib,"ws2_32.lib")
using namespace std;

class C
{

public: 
  C();
  ~C();
  static void readfr();
  

};
#endif //_H_H__

cpp

#include "h.h"
SOCKET s;
C::C(){

  WSADATA wsadata;
  WORD v = MAKEWORD(2, 2);
  if (WSAStartup(v,&wsadata)==-1)
  {
    exit(0);
  }
  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");
  int n = sizeof(sin);
  if (::connect(s, (SOCKADDR*)&sin, n) == -1)
    return;
  thread t(readfr);
  t.detach();
  
  
}
C::~C(){

  WSACleanup();
}
void C::readfr(){
  char buf[255];
  int can = 256;
  int n;
  int used= 0;
  int R = recv(s, buf, 256, 0);
  buf[R] = '\0';
  cout << "Get "<<buf << endl;
  ifstream in("1.txt", ios_base::binary | ios_base::in);
  if (!in.is_open())
  {
    cout << "Open Fail" << endl;
    return;
  }
  in.seekg(0, ios::end);
  n = in.tellg();
  in.seekg(0, ios::beg);
  cout << n << endl;
  if (n<can)
  {
    char buff[255];
    in.read(buff, n);
  
    ::send(s, buff,n, 0);
    cout << "send over" << endl;
    
    in.close();
    R = ::recv(s, buff, 256, 0);
    return;
  }
  int num = 0;
   while (n>0)
  {
    if (n >can)
      used = can;
    else
      used = n;
    n -= used;
    char * buff = new char[used];
    in.read(buff, used);
    ::send(s, buff, used, 0);
    cout << ++num << endl;
    
    
    R = ::recv(s, buff, 256, 0);
    delete buff;
    if (R<=0)
    {
      break;
    }
    Sleep(1);
   }
   if (in.is_open())
   in.close();
  closesocket(s);

}

int main(){

  C c;
  system("pause");
}