我有这个代码,我从同一台PC上的虚拟机运行客户端它可以连接,但它永远不会收到LOGIN消息,可能是什么原因?
不确定send flags
参数是否设置正确。
static const char *LOGIN = "LOGIN\n";
int main()
{
int s = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
//initialize structure
bzero(&addr, addrlen);
addr.sin_family = AF_INET;
addr.sin_port = htons(6666);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(s, (struct sockaddr *)&addr, addrlen);
listen(s, 1);
struct sockaddr_in client_addr;
socklen_t client_addrlen = sizeof(client_addr);
int c = accept(s, (struct sockaddr *)&client_addr, &client_addrlen);
char *msg = new char[15];
//print client address
char * buf = new char[16];
inet_ntop(AF_INET, &(client_addr.sin_addr.s_addr), buf, 16);
cout << "Client connected: " << buf << endl;
cout << "---------------------" << endl;
send(c, LOGIN, sizeof(LOGIN), 0);
close(c);
close(s);
return 0;
}
答案 0 :(得分:3)
你必须改变:
static const char *LOGIN = "LOGIN\n";
为:
static const char LOGIN[] = "LOGIN\n";
和发送电话:
send(c, LOGIN, sizeof(LOGIN)-1, 0);
原始调用传递了4(如果在32位系统上),因为sizeof
应用于指针而不是字符串。固定版本中的-1
会从字符串中减去终止'0'
。