Socket通信-客户端

WSADATA wsd;
SOCKET sHost;
SOCKADDR_IN servAddr;

if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
return -1;
sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (INVALID_SOCKET == sHost)
{
WSACleanup();
return -1;
}

servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
servAddr.sin_port = htons((short)4999);
int nServAddlen = sizeof(servAddr);

int nRetVal = connect(sHost, (LPSOCKADDR)&servAddr, sizeof(servAddr));
if (SOCKET_ERROR == nRetVal)
{
closesocket(sHost);
WSACleanup();
return -1;
}

char SendBuf[SEND_BUF_SIZE] = {0};
memcpy(SendBuf, chCmd, strlen(chCmd));
nRetVal = send(sHost, SendBuf, strlen(SendBuf), 0);
if (SOCKET_ERROR == nRetVal)
{
closesocket(sHost);
WSACleanup();
return -1;
}
closesocket(sHost);
WSACleanup();