udp传输文件

本程序转自腾讯课堂里面的《C++之网络编程》视频教程里的。地址为    https://ke.qq.com/course/141506#term_id=100159728

服务器端：

#include<stdio.h>

#include<string.h>
#include<WinSock2.h>
#include<Windows.h>
#include<iostream>
#pragma comment(lib,"WS2_32.lib")


#define MAX_BUF 65536
using namespace std;


int main()
{
//初始化版本号
WSADATA wsaData;
int ret=WSAStartup(MAKEWORD(2,2),&wsaData);
if(ret!=0)
{
cout<<"wsastarup error"<<endl;
return 0;
}


//建立套接字
SOCKET s;
s=socket(AF_INET,SOCK_DGRAM,0);
if(s==INVALID_SOCKET)
{
 cout<<"socket error"<<endl;
 WSACleanup();
 return 0;
}


//定义一个地址，并进行绑定
sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(5000);
sin.sin_addr.S_un.S_addr=htonl(INADDR_ANY);


//绑定地址
int r=bind(s,(sockaddr*)&sin,sizeof(sin));
if(r==SOCKET_ERROR)
{
  cout<<"bind error"<<endl;
  closesocket(s);
  WSACleanup();
  return 0;
}

//接收缓存区
char recvbuf[MAX_BUF];

//初始化缓存区
memset(recvbuf,0,MAX_BUF);


//定义一个地址结构
sockaddr_in addr;
int addrlen=sizeof(addr);


//输入文件的路径
char path[100]={"0"};
cout<<"请输入文件的路径：（例如D:\\1.txt）"<<endl;
cin>>path;


//打开文件
FILE *fp;
fopen_s(&fp,path,"wb");
if(!fp)
{
cout<<"文件打开失败"<<endl;
return 0;
}
else
{
 cout<<"文件已经打开，等待传输......"<<endl;
}
while (true)
{
//接收
memset(recvbuf,0,MAX_BUF);
int rBye=recvfrom(s,recvbuf,MAX_BUF,0,(sockaddr*)&addr,&addrlen);


//接收失败
if(rBye==SOCKET_ERROR)
{
cout<<"recvfrom error"<<WSAGetLastError()<<endl;
closesocket(s);
WSACleanup();
return 0;
}


//接收成功
fwrite(recvbuf,1,1024,fp);
fclose(fp);
}
closesocket(s);
WSACleanup();
return 0;

}

客户端：

本程序转自腾讯课堂里面的《C++之网络编程》视频教程里的。地址为    https://ke.qq.com/course/141506#term_id=100159728

#include<stdio.h>
#include<string.h>
#include<WinSock2.h>
#include<iostream>
#include<Windows.h>
#pragma comment(lib,"WS2_32.lib")


using namespace std;


int main()
{
   //初始化版本号
WSADATA wsaData;
int ret=WSAStartup(MAKEWORD(2,2),&wsaData);
if(ret!=0)
{
cout<<"wsastarup error"<<endl;
return 0;
}


//建立套接字
SOCKET s;
s=socket(AF_INET,SOCK_DGRAM,0);
if(s==INVALID_SOCKET)
{
cout<<"socket error"<<endl;
WSACleanup();
return 0;
}


//目的地址
sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=htons(5000);
sin.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");


//要发送的文件路径
char path[100]={"0"};
cout<<"请输入要发送文件的路径：（例如D:\\1.txt）"<<endl;
cin>>path;


//打开文件
FILE *fp;
fopen_s(&fp,path,"rb");


if(!fp)
{
   cout<<"fopen_s error"<<endl;
return 0;
}
else
{
cout<<"文件已经打开，客户端等待传输"<<endl;
}


//发送缓存区
char sendbuf[1024]={0};
while (!feof(fp))
{
//清空sendbuf
memset(sendbuf,1,1024);


//把数据写入sendbuf
fread(sendbuf,1,1024,fp);


//发送sendbuf
int n=sendto(s,sendbuf,strlen(sendbuf),0,(sockaddr*)&sin,sizeof(sin));
if(n==SOCKET_ERROR)
{
cout<<"sendto error"<<endl;
closesocket(s);
WSACleanup();
return 0;
}
}
fclose(fp);
closesocket(s);
WSACleanup();
return 0;
}