c - 套接字发送()和接收()不工作

Question

我编写了一个简单的代码来send()和recv()数据，但是当我recv()<时，我得到的错误为-1/em> 数据。发送没有给出任何错误。

服务器代码:

struct sockaddr_in name;
char *buf;

int main(int agrc, char** argv) {

int sock, new_sd;   //sock is this socket, new_sd is connection socket
int adrlen, cnt;

name.sin_family=AF_INET;
name.sin_port=htons(6050);

sock = socket(AF_INET, SOCK_STREAM, 0);

if (sock < 0) {
    printf("\nserver socket failure ");
    printf("\nServer: ");
    exit(1);
}
printf("sockfd=%d\n",sock);
adrlen=(socklen_t)sizeof(name);
if((bind (sock,(struct sockaddr *)&name,adrlen)) < 0)
   printf("\nBind failure");
if(listen(sock, 5) < 0)
   printf("\nlisten error ");
printf("listen done\n");
while(1) {
    if( new_sd =(accept(sock,(struct sockaddr *)&name,(socklen_t*)&adrlen)) < 0) {
        printf("\nserver accept failure ");
        exit(1);
    }
    printf("new_sd=%d",new_sd);

    buf = (char *)malloc(14);
    if((recv(new_sd,(void *)buf,14,MSG_WAITALL)) < 0){
       printf("\nError receiving data ");
        exit(1);
    }
}   //end while
return 0;
}

客户端代码:

char buf[14];
struct sockaddr_in name;

int main(int agrc, char** argv) {

int sock, new_sd, adrlen, cnt;
name.sin_family=AF_INET;
name.sin_port=htons(6050);

sock = socket(AF_INET, SOCK_STREAM, 0);

if (sock < 0) {
   printf("\nserver socket failure ");
   printf("\nServer: ");
    exit(1);
}

//stuff for server socket
printf("sock is %d\n",sock);
adrlen=(socklen_t)sizeof(name);


if((connect(sock,(struct sockaddr *)&name,adrlen)) < 0) {
    printf("\nclient connection failure ");
    exit(1);
}

printf("\nSuccessful connection from client 1");

strcpy(buf,"\nclientsend");

if((send(sock,(void *)buf,strlen(buf), 0)) < 0) {
    printf("\nError sending data from client 1 ");
    exit(1);
}
printf("\nExiting normally");
return 0;
}

Answer 1

可能会出现许多错误。您应该使用 GetLastError() 来了解更多信息。

此外，我注意到在客户端和服务器示例中，您都没有完全初始化“sockaddr_in name”，例如 name.ai_addr 保持原样。如果是 TCP (SOCK_STREAM)，您需要一个地址来连接。