Question

我想使用select();实现服务器客户端单线程对于服务器部分，我从http://www.binarytides.com/code-tcp-socket-server-winsock/获取代码，对于客户端，该站点不提供某些代码，他们使用netcat来模拟客户端。因此，对于客户端，我使用此代码： -

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

#pragma comment(lib,"ws2_32.lib")

int main(void) {

struct sockaddr_in si_other;
int s, slen=sizeof(si_other);
char buf[512];
char message[512];
WSADATA wsa;

//Initialise winsock
printf("\nInitialising Winsock...");
if (WSAStartup(MAKEWORD(2,2),&wsa) != 0)
{
    printf("Failed. Error Code : %d",WSAGetLastError());
    exit(EXIT_FAILURE);
}
printf("Initialised.\n");

//create socket
if ( (s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR)
{
    printf("socket() failed with error code : %d" , WSAGetLastError());
    exit(EXIT_FAILURE);
}

//setup address structure
memset((char *) &si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(8888);
si_other.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

//start communication
while(1)
{
    printf("Enter message : ");
    gets(message);

    //send the message
    if (sendto(s, message, strlen(message) , 0 , (struct sockaddr *) &si_other, slen) == SOCKET_ERROR)
    {
        printf("sendto() failed with error code : %d" , WSAGetLastError());
        exit(EXIT_FAILURE);
    }

    //receive a reply and print it
    //clear the buffer by filling null, it might have previously received data
    memset(buf,'\0', BUFLEN);
    //try to receive some data, this is a blocking call
    if (recvfrom(s, buf, BUFLEN, 0, (struct sockaddr *) &si_other, &slen) == SOCKET_ERROR)
    {
        printf("recvfrom() failed with error code : %d" , WSAGetLastError());
        exit(EXIT_FAILURE);
    }

    puts(buf);
}

closesocket(s);
WSACleanup();

return 0;
 }

即使服务器和客户端具有相同的端口，客户端也总是返回-1，这意味着他不向服务器发送任何消息。有人可以告诉我这里我做错了什么吗？任何提示将不胜感激。

感谢。

服务器客户端使用select（）

0 个答案: