简单的 winsock UDP通信 MINGW

gcc 编译：

gcc -o server server.c -lws2_32
gcc -o client client.c -lws2_32 

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server端代码

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

WORD RPort =6666; //客户端 port
char RIP[16]="127.0.0.1";
WORD LPort =7777; //服务端 port
char LIP[16]="127.0.0.1";

SOCKET S;
struct sockaddr_in rAddr;
struct sockaddr_in lAddr;

WSADATA WD; //winsock dll  消息
int r ; // result

void ShowInfo(char *info)
{
    puts(info);
    exit(1);
}
void SetSockAddr(struct sockaddr_in *A,WORD Port,char *IP)
{
    A->sin_family=AF_INET; //tcp/tp协议           win下PF_INET 与AF_INET 相同
    A->sin_port=htons(Port); //端口          主机字节顺序转网络字节顺序
    A->sin_addr.s_addr=inet_addr(IP); //IP地址
}
 int main(int argc,char *argv[])
 {

     WORD    V;
     V=0x0202 ; //winsock 版本 2.2  ，可以用  MAKEWORD(2,2) 表示

    r=WSAStartup(V,(LPWSADATA)&WD); //载入适合的winsock动态链接库
    if(r == SOCKET_ERROR) ShowInfo("Start Error"); // SOCKET_ERROR  等于 -1

    S=socket(AF_INET,SOCK_DGRAM,0); // create win socket
                                                                                   //socket(int af,int type,int protocel)

                                                                                  //程序结束前使用closesocket(S)
    if(S == SOCKET_ERROR) ShowInfo("socket create error");

    SetSockAddr(&lAddr,LPort,LIP);

    r=bind(S,(struct sockaddr far *)&lAddr,sizeof(lAddr));
    if(r == SOCKET_ERROR) ShowInfo("bind error");

    SetSockAddr(&rAddr,RPort,RIP);

    char msg[80];

        do{
            puts("wait client....");

            //接收client端信息
            r=recv(S,msg,80,0);
            if(r ==SOCKET_ERROR ) ShowInfo("receive error");

            msg[r]='\0';


            if(!strcmp(msg,"exit")) {
                printf("client is exit\n");
                break;
            }

            puts("client message :");
            puts(msg);

            // inform client message is succeed receive
            strcpy(msg,"ok!");
            r=sendto(S,msg,strlen(msg),0,(struct sockaddr far *)&rAddr,sizeof(rAddr));
            if( r == SOCKET_ERROR ) ShowInfo("send error");

        } while(1);
        closesocket(S);
        WSACleanup();

     return 0;
 }

client端代码

#include <stdio.h>
#include <winsock2.h>

WORD    rport=7777;
char     rip[16]="127.0.0.1";
WORD    lport=6666;
char     lip[16]="127.0.0.1";

SOCKET S;

struct     sockaddr_in    raddr;
struct  sockaddr_in    laddr;

WSADATA WD;

int r;

void ShowInfo(char *info){
    puts(info);
    printf("error code is %d\n",WSAGetLastError());
    exit(1);
}

void    SetSockAddr(struct sockaddr_in *A,WORD Port ,char *IP)
{
    A->sin_family =AF_INET;
    A->sin_port = htons(Port);
    A->sin_addr.s_addr=inet_addr(IP);

}

int main(int argc ,char *argv[])
{
    // load winsock dll
    r = WSAStartup(MAKEWORD(2,2),&WD);
    if(r == SOCKET_ERROR) ShowInfo(" start error");

    //create win sokcet
    S = socket(AF_INET,SOCK_DGRAM,0);
    if(S == SOCKET_ERROR) ShowInfo( "socket error");

    //message
    char msg[80];

    //set socket  localhost
    SetSockAddr(&laddr,lport,lip);

    //指定 Socket 的 Local 位址
    r=bind(S,(struct sockaddr far *)&laddr,sizeof(laddr));
    if(r == SOCKET_ERROR ) ShowInfo(" bind error");

    //set socket server
    SetSockAddr(&raddr,rport,rip);

    //--------get message and send messge
    do{
        puts("send:");
        gets(msg);

        //send to server
        r=sendto(S,msg,strlen(msg),0,(struct sockaddr far *)&raddr,sizeof(raddr));
        if( r == SOCKET_ERROR ) ShowInfo("send error");

        // exit
        if(! strcmp( msg,"exit")) break;

        puts("send ok! wait server recieve");

        //get recieve
        r=recv(S,msg,80,0);
        if( r== SOCKET_ERROR ) ShowInfo("recieve error");
        puts("server:");
        msg[r]='\0';
        puts(msg);


    }while(1);

    closesocket(S); //close socket
    WSACleanup(); //中止Windows Sockets DLL的使用

    return 0;
}

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