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void CFastScanDlg::OnBnClickedButton1()
{
	char tStr[255]; 
	SOCKET sock[MAX_SOCKETS];
	int busy[MAX_SOCKETS], port[MAX_SOCKETS];
	int iStartPort, iEndPort, iBusySocks = 0;
	struct sockaddr_in addr;
	fd_set fdWaitSet;
 
	WSADATA wsd;
	if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
	{
		SetDlgItemText(IDC_STATUSTEXT, "Can't load WinSock");
		return;
	}
 
	SetDlgItemText(IDC_STATUSTEXT, "Resolving host");
 
	chStartPort.GetWindowText(tStr, 255);
	iStartPort = atoi(tStr);
	chEndPort.GetWindowText(tStr, 255);
	iEndPort = atoi(tStr);
 
	chHostName.GetWindowText(tStr, 255);
 
	struct hostent *host=NULL;
	host = gethostbyname(tStr);
	if (host == NULL)
	{
		SetDlgItemText(IDC_STATUSTEXT,
			"Unable to resolve host");
		return;
	}
 
	for (int i = 0; i < MAX_SOCKETS; i++)
		busy[i] = 0;
 
	SetDlgItemText(IDC_STATUSTEXT, "Scanning");
 
	while (((iBusySocks) || (iStartPort <= iEndPort)))
	{
	    for (int i = 0; i < MAX_SOCKETS; i++)
		{
			if (busy[i] == 0 && iStartPort <= iEndPort)
			{		
				sock[i] = socket (AF_INET,
					SOCK_STREAM, IPPROTO_TCP);				
				if (sock[i] < 0)
				{
					SetDlgItemText(IDC_STATUSTEXT,
						"Socket filed");
					return;
				}
				iBusySocks++;
				addr.sin_family = AF_INET;
				addr.sin_port = htons (iStartPort);
				CopyMemory(&addr.sin_addr, host->h_addr_list[0],
						host->h_length);
 
				ULONG ulBlock;
				ulBlock = 1;
				if (ioctlsocket(sock[i], FIONBIO, &ulBlock) ==
					SOCKET_ERROR)
				{
					return;
				}
 
				connect(sock[i], (struct sockaddr *) &addr,
					sizeof (addr));
				if (WSAGetLastError() == WSAEINPROGRESS)
				{
					closesocket (sock[i]);
					iBusySocks--;
				}
				else
				{
					busy[i] = 1;
					port[i] = iStartPort;
				}
				iStartPort++;
			}
		}
		FD_ZERO (&fdWaitSet);
		for (int i = 0; i < MAX_SOCKETS; i++)
		{
			if (busy[i] == 1)
				FD_SET (sock[i], &fdWaitSet);
		}
 
		struct timeval tv;
		tv.tv_sec = 1;
		tv.tv_usec = 0;
 
		if (select (1, NULL, &fdWaitSet, NULL, &tv) == SOCKET_ERROR)
		{	  
			SetDlgItemText(IDC_STATUSTEXT, "Select error");
			return;
		}
 
		for (int i = 0; i < MAX_SOCKETS; i++)
		{
			if (busy[i] == 1)
			{
				if (FD_ISSET (sock[i], &fdWaitSet))
				{
					int opt;
					int Len = sizeof(opt);
					if (getsockopt(sock[i], SOL_SOCKET,
						SO_ERROR, (char*)&opt, &Len) ==
						SOCKET_ERROR)
						SetDlgItemText(IDC_STATUSTEXT,
							"getsockopt error");
 
					if (opt == 0)
					{
						struct servent *tec;						
						itoa(port[i],tStr, 10);
						strcat(tStr, " (");
						tec = getservbyport(htons (port[i]),
							"tcp");
						if (tec==NULL)
							strcat(tStr, "Unknown");
						else
							strcat(tStr, tec->s_name);
 
						strcat(tStr, ") - open");
						m_PortList.AddString(tStr);
						busy[i] = 0;
						shutdown(sock[i], SD_BOTH);
						closesocket(sock[i]);
					}
					busy[i] = 0;
					shutdown (sock[i], SD_BOTH);
					closesocket (sock[i]);
					iBusySocks--;					
				}
				else
				{
					busy[i] = 0;
					closesocket(sock[i]);
					iBusySocks--;
				}
			}
		}
		ProcessMessages();
	}
	WSACleanup();
	SetDlgItemText(IDC_STATUSTEXT, "Scaning complete");
	return;
}
 

prog.cpp:1: error: 'CFastScanDlg' has not been declared
prog.cpp: In function 'void OnBnClickedButton1()':
prog.cpp:4: error: 'SOCKET' was not declared in this scope
prog.cpp:4: error: expected `;' before 'sock'
prog.cpp:5: error: 'MAX_SOCKETS' was not declared in this scope
prog.cpp:7: error: aggregate 'sockaddr_in addr' has incomplete type and cannot be defined
prog.cpp:8: error: 'fd_set' was not declared in this scope
prog.cpp:8: error: expected `;' before 'fdWaitSet'
prog.cpp:10: error: 'WSADATA' was not declared in this scope
prog.cpp:10: error: expected `;' before 'wsd'
prog.cpp:11: error: 'MAKEWORD' was not declared in this scope
prog.cpp:11: error: 'wsd' was not declared in this scope
prog.cpp:11: error: 'WSAStartup' was not declared in this scope
prog.cpp:13: error: 'IDC_STATUSTEXT' was not declared in this scope
prog.cpp:13: error: 'SetDlgItemText' was not declared in this scope
prog.cpp:17: error: 'IDC_STATUSTEXT' was not declared in this scope
prog.cpp:17: error: 'SetDlgItemText' was not declared in this scope
prog.cpp:19: error: 'chStartPort' was not declared in this scope
prog.cpp:20: error: 'atoi' was not declared in this scope
prog.cpp:21: error: 'chEndPort' was not declared in this scope
prog.cpp:24: error: 'chHostName' was not declared in this scope
prog.cpp:26: error: 'NULL' was not declared in this scope
prog.cpp:27: error: 'gethostbyname' was not declared in this scope
prog.cpp:36: error: 'busy' was not declared in this scope
prog.cpp:44: error: 'busy' was not declared in this scope
prog.cpp:46: error: 'sock' was not declared in this scope
prog.cpp:46: error: 'AF_INET' was not declared in this scope
prog.cpp:47: error: 'SOCK_STREAM' was not declared in this scope
prog.cpp:47: error: 'IPPROTO_TCP' was not declared in this scope
prog.cpp:47: error: 'socket' was not declared in this scope
prog.cpp:56: error: 'htons' was not declared in this scope
prog.cpp:57: error: invalid use of incomplete type 'struct hostent'
prog.cpp:26: error: forward declaration of 'struct hostent'
prog.cpp:58: error: invalid use of incomplete type 'struct hostent'
prog.cpp:26: error: forward declaration of 'struct hostent'
prog.cpp:58: error: 'CopyMemory' was not declared in this scope
prog.cpp:60: error: 'ULONG' was not declared in this scope
prog.cpp:60: error: expected `;' before 'ulBlock'
prog.cpp:61: error: 'ulBlock' was not declared in this scope
prog.cpp:62: error: 'FIONBIO' was not declared in this scope
prog.cpp:62: error: 'ioctlsocket' was not declared in this scope
prog.cpp:63: error: 'SOCKET_ERROR' was not declared in this scope
prog.cpp:69: error: 'connect' was not declared in this scope
prog.cpp:70: error: 'WSAGetLastError' was not declared in this scope
prog.cpp:70: error: 'WSAEINPROGRESS' was not declared in this scope
prog.cpp:72: error: 'closesocket' was not declared in this scope
prog.cpp:78: error: 'port' was not declared in this scope
prog.cpp:83: error: 'fdWaitSet' was not declared in this scope
prog.cpp:83: error: 'FD_ZERO' was not declared in this scope
prog.cpp:86: error: 'busy' was not declared in this scope
prog.cpp:87: error: 'sock' was not declared in this scope
prog.cpp:87: error: 'FD_SET' was not declared in this scope
prog.cpp:90: error: aggregate 'timeval tv' has incomplete type and cannot be defined
prog.cpp:94: error: 'select' was not declared in this scope
prog.cpp:94: error: 'SOCKET_ERROR' was not declared in this scope
prog.cpp:102: error: 'busy' was not declared in this scope
prog.cpp:104: error: 'sock' was not declared in this scope
prog.cpp:104: error: 'FD_ISSET' was not declared in this scope
prog.cpp:108: error: 'SOL_SOCKET' was not declared in this scope
prog.cpp:109: error: 'SO_ERROR' was not declared in this scope
prog.cpp:109: error: 'getsockopt' was not declared in this scope
prog.cpp:110: error: 'SOCKET_ERROR' was not declared in this scope
prog.cpp:117: error: 'port' was not declared in this scope
prog.cpp:117: error: 'itoa' was not declared in this scope
prog.cpp:118: error: 'strcat' was not declared in this scope
prog.cpp:119: error: 'htons' was not declared in this scope
prog.cpp:120: error: 'getservbyport' was not declared in this scope
prog.cpp:124: error: invalid use of incomplete type 'struct servent'
prog.cpp:116: error: forward declaration of 'struct servent'
prog.cpp:127: error: 'm_PortList' was not declared in this scope
prog.cpp:129: error: 'SD_BOTH' was not declared in this scope
prog.cpp:129: error: 'shutdown' was not declared in this scope
prog.cpp:130: error: 'closesocket' was not declared in this scope
prog.cpp:133: error: 'SD_BOTH' was not declared in this scope
prog.cpp:133: error: 'shutdown' was not declared in this scope
prog.cpp:134: error: 'closesocket' was not declared in this scope
prog.cpp:140: error: 'closesocket' was not declared in this scope
prog.cpp:145: error: 'ProcessMessages' was not declared in this scope
prog.cpp:147: error: 'WSACleanup' was not declared in this scope

Standard output is empty