The connect () function returns zero, regardless of whether it was able to connect or not

Question

When I use the function connect()on the i7 computer, it always returns zero, regardless of whether it was able to connect or not. I just do not have another application to connect, and it still returns zero (server address 127.0.0.1).

When I run the same application on another computer, it behaves correctly. So what could be the problem?

Thank.

Change the transition from the answer below.

The code

struct hostent* pHostEntry;

pHostEntry = gethostbyname(host);

if(pHostEntry == NULL)
{
    return 0;
}

struct in_addr* host_addr = (struct in_addr*) * pHostEntry->h_addr_list;

if(host_addr == NULL)
{
    return 0;
}

long sockfd;

if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
    return 0;
}

memset((char*) &serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr  = *host_addr;
serv_addr.sin_port   = htons(port);

if(connect(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == SOCKET_ERROR)
{
    CloseSocket();
    sockfd = -1;
    return 0;
}

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Answer 1

, Windows 7 IP6- . pHostEntry->h_addrtype.

Answer 2

:

if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)

Unix , , , . socket, -1 . .

Windows, , , .

Windows . socket INVALID_SOCKET , .