C / C++ / MFC

WORD wVersionRequested = MAKEWORD(2,0);
WSADATA wsaData;
int nRet;

nRet = WSAStartup(wVersionRequested, &wsaData);
if(nRet) {
    //AfxMessageBox("WSAStartup()");
    WSACleanup();
    return -1;
}

if(wsaData.wVersion != wVersionRequested) {
    //AfxMessageBox("WinSock version not supported");
    WSACleanup();
    return -1;
}

LPHOSTENT lpHostEntry;

lpHostEntry = gethostbyname(lpServerName);

if(lpHostEntry == NULL) {
    //AfxMessageBox("gethostbyname()");
    WSACleanup();
    return -1;
}

SOCKADDR_IN sa;
sa.sin_family = AF_INET;
sa.sin_addr = *((LPIN_ADDR)*lpHostEntry->h_addr_list);
sa.sin_port = htons(nPort);

pSocket = new SOCKET;
*pSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(*pSocket == INVALID_SOCKET) {
    //AfxMessageBox("socket()");
    WSACleanup();
    return -1;
}

hEvent = new WSAEVENT;
*hEvent = WSACreateEvent();
if(*hEvent == WSA_INVALID_EVENT) {
    AfxMessageBox("WSACreateEvent()");
    closesocket(*pSocket);
    WSACleanup();
    return -1;
}

nRet = WSAEventSelect(*pSocket, *hEvent, FD_READ|FD_CONNECT|FD_CLOSE);
if(nRet == SOCKET_ERROR) {
    AfxMessageBox("EventSelect()");
    closesocket(*pSocket);
    WSACloseEvent(*hEvent);
    WSACleanup();
    return -1;
}

nRet = connect(*pSocket, (LPSOCKADDR)&sa, sizeof(SOCKADDR_IN));
if(nRet == SOCKET_ERROR) {
    nRet = WSAGetLastError();
    if(nRet == WSAEWOULDBLOCK) {
        //AfxMessageBox("Connect would block");
    }
    else {
        //AfxMessageBox("connect()");
        closesocket(*pSocket);
        WSACloseEvent(*hEvent);
        WSACleanup();
        return -1;
    }
}

WSANETWORKEVENTS events;
while(1) {
    DWORD dwRet;
    dwRet = WSAWaitForMultipleEvents(1,
        hEvent,
        FALSE,
        5000,
        FALSE);
    if (dwRet == WSA_WAIT_TIMEOUT) {
        AfxMessageBox("Wait timed out1");
        closesocket(*pSocket);
        WSACloseEvent(*hEvent);
        return -1;
    }

    nRet = WSAEnumNetworkEvents(*pSocket, *hEvent, &events);

    if (nRet == SOCKET_ERROR) {
        AfxMessageBox("WSAEnumNetworkEvents()");
        closesocket(*pSocket);
        WSACloseEvent(*hEvent);
        return -1;
    }

    if (events.lNetworkEvents & FD_CLOSE) {
        AfxMessageBox("closing...");
        closesocket(*pSocket);
        WSACloseEvent(*hEvent);
    }

    if (events.lNetworkEvents & FD_CONNECT) {
        if(events.iErrorCode[FD_CONNECT_BIT]!=0)
            return -1;

        //AfxMessageBox("connected");
        return 0;
    }
}
return 0;

//Pointer to button array<br />
CButton* myButton;<br />
<br />
//Hold number of buttons in the list<br />
int nbButtons;<br />
<br />
//Add a button in the list<br />
void InsertButton(LPCTSTR lpszText);

void CLinkList::InsertButton(LPCTSTR lpszText)<br />
{<br />
        // Memory allocation ( preserve existing!! )<br />
	if(nbButtons<1)   // First memory allocation<br />
	    myButton=(CButton*)malloc(sizeof(CButton)*(nbButtons+1));	<br />
        else              // Dynamic realoccation<br />
	    myButton=(CButton*)realloc(myButton, sizeof(CButton)* (nbButtons+1));	<br />
<br />
        // Set location<br />
	CRect rect(0,nbButtons*25,60,20);<br />
	<br />
        // Create the button control<br />
	myButton[nIndex].Create( lpszText, WS_VISIBLE | WS_CHILD, rect, this, GetDlgCtrlID() );<br />
<br />
        // Increment number of buttons in the list<br />
	nbButtons++;<br />
<br />
}

cs.dwStyles = ~ WS_VSCROLL;