基于UDP的文件传输VS编程

要求：实现基于UDP的文件传输，客户端发送文件，服务端接受文件

服务端实现：

#include "stdafx.h"
#include "iostream"
#include "afxdialogex.h"
#include "winsock2.h"
using namespace std;
#define DEFAULT_PORT 1000//服务器监听端口
#define Length 1024*60//缓冲区大小

int main()
{
	WSADATA wsadata;//结构被用来保存函数
	int WsaStart = WSAStartup(MAKEWORD(1, 1), &wsadata);//返回的Windows Socket 初始化信息
	if (WsaStart != 0){
		return -1;
	}
	SOCKET Socket;
	Socket = socket(AF_INET, SOCK_DGRAM, 0);
	if (Socket < 0){
		cout << "socket build error!" << endl;
		WSACleanup();//释放资源
		return -1;
	}
	else{
		cout << "socket build success" << endl;
	}
	char HostName[128];//记录主机名
	char *IPAddress;//记录IP地址
	if (gethostname(HostName, 128) == 0)//获取主机名成功
	{
		struct hostent *pHost;
		pHost = gethostbyname(HostName);//用域名或主机名获取IP地址
		IPAddress = inet_ntoa(*(struct in_addr*)pHost->h_addr_list[0]);//取第一个地址
	}
	struct sockaddr_in local;//使用sockaddr_in结构指定IP地址和端口信息
	local.sin_family = AF_INET;
	local.sin_addr.S_un.S_addr = inet_addr(IPAddress);//将一个点分十进制的IP转换成一个长整数型 数(u_long类型),返回的整数形式是网络字节序
	local.sin_port = htons(DEFAULT_PORT);//设置的端口为DEFAULT_PORT。将整型变量从主机字 节顺序转变成网络字节顺序
	int BIND = bind(Socket, (sockaddr*)& local, sizeof(local));
	if (BIND == SOCKET_ERROR)//将IP地址和端 口绑定到所创建的套接字上
		cout << "socket build error!" << endl;
	else
		cout << "socket build success!" << endl;
	cout << "The machine address：" << inet_ntoa(local.sin_addr) << endl;
	sockaddr_in ClientAddr;//记录数据包的IP地址
	int nLen = sizeof(sockaddr);
	char szBuf[Length];//数据缓冲区
	memset(szBuf, 0, Length);//初始化缓冲区
	char path[100] = { "0" };
	cout << "Please enter file path:  (G:\\2.txt)" << endl;
	gets(path);
	FILE *file = fopen(path, "wb");
	if (!file)
	{
		cout << "Open file failed" << endl;
		return 1;
	}
	else
	{
		cout << "Waiting!!!" << endl;
	}
	while (1)
	{
		memset(szBuf, 0, Length);//清空缓冲区
		int rByte = recvfrom(Socket, szBuf, Length, 0, (struct sockaddr*)&ClientAddr, &nLen);//接受文件，写入缓冲区
		fwrite(szBuf, rByte, 1, file);//写入文件
		if (rByte < Length)
			break;
		if (SOCKET_ERROR == rByte)
		{
			printf("recvfrom()Failed:%d\n", WSAGetLastError());
			closesocket(Socket);
			WSACleanup();
			return -1;
		}
	}
	fclose(file);
	closesocket(Socket);
	WSACleanup();
	system("pause");
	return 0;
}

 

客户端实现：

#include "stdafx.h"
#include "iostream"
#include "afxdialogex.h"
#include "winsock2.h"
using namespace std;
#define DEFAULT_PORT 1000//服务器监听端口
#define Length 1024*60

int main(){
	WSADATA wsadata;
	int WsaStart = WSAStartup(MAKEWORD(1, 1), &wsadata);
	if (WsaStart != 0){
		WSACleanup();
		return -1;
	}
	SOCKET Socket;
	Socket = socket(AF_INET, SOCK_DGRAM, 0);
	if (Socket < 0){
		cout<<"socket build error!"<