为什么我对connect（）的调用失败了？

Question

在C中，我尝试使用以下函数连接到服务器：

int clientConnect() {

//1. Set up connection address and port
char *ipAddress = SMSA_DEFAULT_IP;
int port = SMSA_DEFAULT_PORT;

//1a. Set up a sockaddr_in struct as described in lecture
struct sockaddr_in caddr;
caddr.sin_family = AF_INET;
caddr.sin_addr.s_addr = htonl(SMSA_DEFAULT_IP);
caddr.sin_port = htons( port );

//2. Create a socket
server_socket = socket(PF_INET, SOCK_STREAM, 0);

if(server_socket == -1)
{
    logMessage(1, "There was an error creating a socket in clientConnect()");
    return -1;
}

//3. Connect
if( connect(server_socket, (const struct sockaddr *)&caddr, sizeof(struct sockaddr) ) == -1)
{
    logMessage(1, "There was an error connecting in clientConnect()");\
    return -1;
}

logMessage(2, "The connection was made!");
return 0;}

调用此函数时，我会在日志There was an error connecting in clientConnect()中收到一条消息。这是我第一次用C进行网络编程，所以我怀疑我错过了什么。

Answer 1

connect的最后一个参数应为sizeof caddr：

connect(server_socket, (const struct sockaddr *)&caddr, sizeof caddr);