请教基本的socket的编程

[braveroc]

按照基本的winsock的例子写的,用vc.net下编译,不知道为什么总是绑定失败
ret 总是等于 -1

SOCKET sock;
sock = socket(AF_INET,SOCK_STREAM,0);
memset( &server,0, sizeof( server ));
server.sin_family = AF_INET ;
server.sin_port =port;
server.sin_addr.s_addr = INADDR_ANY;
;
struct sockaddr hostser;

int ret = 0;
int lengs;
lengs = sizeof(server);

ret = bind(sock, (struct sockaddr *)&server,lengs);
IN
if (ret == SOCKET_ERROR ) {
perror("Socket bind错误");
return SOCKET_ERROR;
}
ret = listen(sock,5);
if (ret == SOCKET_ERROR ) {
perror("Socket listen错误");
return SOCKET_ERROR;
}
unsigned int s ;
//CString p;

int leng =sizeof(sockaddr);
s= accept(sock, ( sockaddr*)&server,&leng); //client's socket
if ( s < 0 ) {
cout<<"accept error"<<endl;
return -1;
}
return 0;

[fellowcheng]

沙发

[viena]

板凳

[真相重于对错]

call
int WSAGetLastError(void);

获得错误码