基于winsocket的UDP的数据单向通信过程
主机A（接收）：
1. 先设置winsocket的版本：
WSADATA WSAData;
WORD wVersionRequested;
wVersionRequested = MAKEWORD( 2, 0 );
//使用WinSocket2.0
2. 利用WSAStartup(wVersionRequested,&WSAData);
启动网络资源
3. 申请本地的SOCKET：（用于后面与IP和端口的绑定，用这个SOCKET，来标记sockaddr_in（IP和端口））
SOCKET LocalSocket=socket(AF_INET,SOCK_DGRAM,0);
////创建客户端socket,是UDP（SOCK_DGRAM数据流）
4. 设置本地套接字sockaddr_in：
struct sockaddr_in sockaddr_local;
sockaddr_local.sin_family = AF_INET;
sockaddr_local.sin_port= htons(LocalPORT); //port number
sockaddr_local.sin_addr= *((struct in_addr *)Localhost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_local.sin_zero),0,8);
5. 绑定本地套接字sockaddr_in到本地套接口SOCKET：
bind(LocalSocket, (struct sockaddrfar *)&sockaddr_local, sizeof(sockaddr_local))
6. 设置远程套接字sockaddr_in：
struct sockaddr_in sockaddr_remote;
sockaddr_remote.sin_family= PF_INET;
sockaddr_remote.sin_port= htons(RemotePORT); //port number
sockaddr_remote.sin_addr= *((struct in_addr *)Remotehost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_remote.sin_zero),0,8);
7. 接收信息：（recvfrom和Sendto的套接口SOCKET都为本地的socket_local，后面sockaddr *为远程套接字和套接字长度）
recvfrom(socket_local,ReceiveMassage,MAXMASSAGESIZE, 0,(sockaddr*)&sockaddr_remote,&sockaddr_inLenght) ;（阻塞接收）
8. 结束通信：
发送结束包，待定改
9. 释放本地的套接口和网络资源：
closesocket(LocalSocket);
WSACleanup();
主机B（发送）：
1. 先设置winsocket的版本：
WSADATA WSAData;
WORD wVersionRequested;
wVersionRequested = MAKEWORD( 2, 0 );
//使用WinSocket2.0
2. 利用WSAStartup(wVersionRequested,&WSAData);
启动网络资源
3. 申请本地的SOCKET：（用于后面与IP和端口的绑定，用这个SOCKET，来标记sockaddr_in（IP和端口））
SOCKET LocalSocket=socket(AF_INET,SOCK_DGRAM,0);
////创建客户端socket,是UDP（SOCK_DGRAM数据流）
4. 设置本地套接字sockaddr_in：
struct sockaddr_in sockaddr_local;
sockaddr_local.sin_family = AF_INET;
sockaddr_local.sin_port= htons(LocalPORT); //port number
sockaddr_local.sin_addr= *((struct in_addr *)Localhost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_local.sin_zero),0,8);
5. 绑定本地套接字sockaddr_in到本地套接口SOCKET：
bind(LocalSocket, (struct sockaddrfar *)&sockaddr_local, sizeof(sockaddr_local))
6. 设置远程套接字sockaddr_in：
structsockaddr_in sockaddr_remote;
sockaddr_remote.sin_family= PF_INET;
sockaddr_remote.sin_port= htons(RemotePORT); //port number
sockaddr_remote.sin_addr= *((struct in_addr *)Remotehost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_remote.sin_zero),0,8);
7. 发送信息：（recvfrom和Sendto的套接口SOCKET都为本地的socket_local，后面sockaddr *为远程套接字和套接字长度）
sendto(socket_local,Massage,sizeof(Massage),0,(sockaddr *)&sockaddr_remote,sizeof(sockaddr_remote));（不停发送）
8. 结束通信：
发送结束包，待定改
9. 释放本地的套接口和网络资源：
closesocket(LocalSocket);
WSACleanup();
代码如下：
简单的阻塞UDP通信(服务器).cpp：
#include <stdio.h>
#include <winsock2.h>
#include<fstream>
#include<iostream>
#pragma comment( lib, "WS2_32.lib" )
using namespace std;
#defineMAXMASSAGESIZE 512
#defineLocalIP "127.0.0.1"
#defineRemoteIP "127.0.0.1"
#defineLocalPORT 8888
#defineRemotePORT 9999
intERROTNUM=0;
voidShowErrorInfo(int ErrorNUM)
{
printf("ERROTNUM=%d\n",ErrorNUM);
printf("Inputany key to exit!!\n");
scanf("%d");
exit(1);
}
voidmain()
{
//启动通信的工作间和建立client套接字
WSADATA WSAData;
WORD wVersionRequested;
wVersionRequested = MAKEWORD( 2, 0 );//使用winSocket2.0
ERROTNUM=WSAStartup(wVersionRequested,&WSAData); //进行WSAStartup函数调用
if(ERROTNUM==0) // 如果成功
{
printf("Socket inital OK !!\n");
}
else
{
ERROTNUM=-1;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//////////////////////////////////////////////////本地参数设置
SOCKET LocalSocket=socket(AF_INET,SOCK_DGRAM,0);////创建客户端socket,是UDP（SOCK_DGRAM数据流）
if(LocalSocket==-1)
{
ERROTNUM=-2;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
HOSTENT *Localhost;
if((Localhost=gethostbyname(LocalIP))==NULL)
{
printf("gethostbyname出错！");
ERROTNUM=-3;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//设置本地参数
struct sockaddr_in sockaddr_local;
sockaddr_local.sin_family = AF_INET;
sockaddr_local.sin_port= htons(LocalPORT); //port number
sockaddr_local.sin_addr= *((struct in_addr *)Localhost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_local.sin_zero),0,8);
//绑定本地套接字
if(bind(LocalSocket, (structsockaddr far *)&sockaddr_local, sizeof(sockaddr_local)))
{
ERROTNUM=-5;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//////////////////////////////////////////////////远程参数设置
HOSTENT*Remotehost;
if((Remotehost=gethostbyname(RemoteIP))==NULL)
{
printf("gethostbyname出错！");
ERROTNUM=-3;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//设置远程套接字
struct sockaddr_in sockaddr_remote;
sockaddr_remote.sin_family = PF_INET;
sockaddr_remote.sin_port= htons(RemotePORT); //port number
sockaddr_remote.sin_addr= *((struct in_addr *)Remotehost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_remote.sin_zero),0,8);
//通信
voidSendANDReceiveMainloop(SOCKET socket_local,sockaddr_in sockaddr_remote );
SendANDReceiveMainloop( LocalSocket,sockaddr_remote );
//关闭本地的套接口和释放资源
closesocket(LocalSocket);
WSACleanup();
}
voidSendANDReceiveMainloop(SOCKET socket_local,sockaddr_in sockaddr_remote )
{
int ReceiveMassageLenght=0;
char ReceiveMassage[MAXMASSAGESIZE]={0,0,0};
int sockaddr_inLenght=sizeof(sockaddr_in);
do
{
//（阻塞接收）
ReceiveMassageLenght=recvfrom(socket_local,ReceiveMassage,MAXMASSAGESIZE, 0,(sockaddr*)&sockaddr_remote,&sockaddr_inLenght) ;
if(ReceiveMassageLenght==0)//对方关闭连接
break;
printf("MassageLenght=%d,ReceiveMassage:%s\n",ReceiveMassageLenght,ReceiveMassage);
}
while(ReceiveMassageLenght!=-1) ;
}
简单的阻塞UDP通信(客户机).cpp：
#include <stdio.h>
#include <winsock2.h>
#include<fstream>
#include<iostream>
#pragma comment( lib, "WS2_32.lib" )
using namespace std;
#defineMAXMASSAGESIZE 512
#defineLocalIP "127.0.0.1"
#defineRemoteIP "127.0.0.1"
#defineLocalPORT 9999
#defineRemotePORT 8888
intERROTNUM=0;
voidShowErrorInfo(int ErrorNUM)
{
printf("ERROTNUM=%d\n",ErrorNUM);
printf("Inputany key to exit!!\n");
scanf("%d\n");
exit(1);
}
voidmain()
{
//启动通信的工作间和建立client套接字
WSADATA WSAData;
WORD wVersionRequested;
wVersionRequested = MAKEWORD( 2, 0 );//使用winSocket2.0
ERROTNUM=WSAStartup(wVersionRequested,&WSAData); //进行WSAStartup函数调用
if(ERROTNUM==0) // 如果成功
{
printf("Socket inital OK !!\n");
}
else
{
ERROTNUM=-1;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//////////////////////////////////////////////////本地参数设置
SOCKET LocalSocket=socket(AF_INET,SOCK_DGRAM,0);////创建客户端socket,是TCP（SOCK_STREAM字节流）
if(LocalSocket==-1)
{
ERROTNUM=-2;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
HOSTENT *Localhost;
if((Localhost=gethostbyname(LocalIP))==NULL)
{
printf("gethostbyname出错！");
ERROTNUM=-3;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//设置本地参数
struct sockaddr_in sockaddr_local;
sockaddr_local.sin_family = AF_INET;
sockaddr_local.sin_port= htons(LocalPORT); //port number
sockaddr_local.sin_addr= *((struct in_addr *)Localhost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_local.sin_zero),0,8);
//绑定本地套接字
if(bind(LocalSocket, (structsockaddr far *)&sockaddr_local, sizeof(sockaddr_local)))
{
ERROTNUM=-5;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//////////////////////////////////////////////////远程参数设置
HOSTENT*Remotehost;
if((Remotehost=gethostbyname(RemoteIP))==NULL)
{
printf("gethostbyname出错！");
ERROTNUM=-3;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
//绑定远程套接字
struct sockaddr_in sockaddr_remote;
sockaddr_remote.sin_family = PF_INET;
sockaddr_remote.sin_port= htons(RemotePORT); //port number
sockaddr_remote.sin_addr= *((struct in_addr *)Remotehost->h_addr);//htonl(INADDR_ANY);//address
memset(&(sockaddr_remote.sin_zero),0,8);
//通信
voidSendANDReceiveMainloop(SOCKET socket_local,sockaddr_in sockaddr_remote );
SendANDReceiveMainloop( LocalSocket,sockaddr_remote );
//关闭本地的套接口和释放资源
closesocket(LocalSocket);
WSACleanup();
}
voidSendANDReceiveMainloop(SOCKET socket_local,sockaddr_in sockaddr_remote )
{
for(inti=0;i<100000;i++)
{
charMassage[MAXMASSAGESIZE]={0,0,0};
printf("i=%d\n",i);
sprintf(Massage,"%d",i);
intSendReturnLenght=0;
//不停地发送
SendReturnLenght=sendto(socket_local,Massage,sizeof(Massage), 0,(sockaddr *)&sockaddr_remote,sizeof(sockaddr_remote));
if ( SendReturnLenght== -1)
{
ERROTNUM=-9;
ShowErrorInfo(ERROTNUM);//错误提示 ///*/
}
}
}