socket 实例

UDP windows下socket编程实例
UDP windows下socket编程实例

因为要测试一个GPRS的UDP上传功能,于是在Windows下写了这个UDP测试小程序.
Server 端程序源代码:
#include <stdio.h>
#include <Winsock2.h>

void main()
{
SOCKET socket1;

//InitWinsock();
 WSADATA wsaData;
    int iErrorCode;
    if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL
    {
         printf("Winsock无法初始化!/n");
         WSACleanup();
         return;
    }

    printf("服务器开始创建SOCKET。/n");
struct sockaddr_in local;
struct sockaddr_in from;
int fromlen =sizeof(from);
local.sin_family=AF_INET;
local.sin_port=htons(27015); ///监听端口
local.sin_addr.s_addr=INADDR_ANY; ///本机

socket1=socket(AF_INET,SOCK_DGRAM,0);
bind(socket1,(struct sockaddr*)&local,sizeof(local));
while (1)
{
char buffer[1024]="/0";
printf("waiting for message from others-------------/n");
if (recvfrom(socket1,buffer,sizeof(buffer),0,(struct sockaddr*)&from,&fromlen)!=SOCKET_ERROR)
{
printf("Received datagram from %s--%s/n",inet_ntoa(from.sin_addr),buffer);
////给cilent发信息
sendto(socket1,buffer,sizeof(buffer),0,(struct sockaddr*)&from,fromlen);

}
//Sleep(1000);
}
closesocket(socket1);
}

 

Client端源代码:

 

#include <stdio.h>
#include <Winsock2.h>

void main()
{
SOCKET socket1;
//InitWinsock();
 WSADATA wsaData;
    int iErrorCode;
    if (WSAStartup(MAKEWORD(2,1),&wsaData)) //调用Windows Sockets DLL
    {
         printf("Winsock无法初始化!/n");
         WSACleanup();
         return;
    }

printf("服务器开始创建SOCKET。/n");
struct sockaddr_in server;
int len =sizeof(server);
server.sin_family=AF_INET;
server.sin_port=htons(27015); ///server的监听端口
server.sin_addr.s_addr=inet_addr("221.223.16.32"); ///server的地址

socket1=socket(AF_INET,SOCK_DGRAM,0);
while (1)
{
    char buffer[1024]="/0";
    printf("input message/n");
    scanf("%s",buffer);
//    printf("%s",buffer);
    if (strcmp(buffer,"bye")==0)
    {
        printf("退出!/n");
        Sleep(100);
        closesocket(socket1);
        break;
    }

    if (sendto(socket1,buffer,sizeof(buffer),0,(struct sockaddr*)&server,len)!=SOCKET_ERROR)
    {
        //printf("sending../n");
        Sleep(100);
        if (recvfrom(socket1,buffer,sizeof(buffer),0,(struct sockaddr*)&server,&len) != SOCKET_ERROR)
        printf("rece from server:%s/n",buffer);
    }
    }
    closesocket(socket1);
}