C / C++ / MFC

Shy Agam wrote:

But how do I go about making my DLL able to talk with my app when used by another external application?

Cedric Moonen wrote:

However, if you explicitely load your dll (by using LoadLibrary), you can place it anywhere you want and specify the path of the dll in the call to LoadLibrary.

if(lpHostEnt == NULL)
{
 CString sOutput;
 sOutput.Format("Non existing hostname, error %d", ::WSAGetLastError());
 AfxMessageBox(sOutput);
}

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modified on Thursday, May 6, 2010 3:47 AM

Non existing hostname, error 10093

SOCKET CSmtp::ConnectRemoteServer(CString sServer, UINT nPort)
{
	short nProtocolPort;
	LPHOSTENT lpHostEnt;
	LPSERVENT lpServEnt;
	SOCKADDR_IN sockAddr;
	SOCKET hServerSocket = INVALID_SOCKET;
	struct in_addr addr;

	// If the user input is an alpha name for the host, use gethostbyname()
	// If not, get host by addr (assume IPv4)

	if(atoi(sServer.Left(1)) == 0)lpHostEnt = gethostbyname(sServer);
	else
	{
		addr.s_addr = inet_addr(sServer);
		if(addr.s_addr == INADDR_NONE)
		{
			m_nError = CSMTP_BAD_IPV4_ADDR;
			return INVALID_SOCKET;
		}
		else lpHostEnt = gethostbyaddr((char *)&addr,4,AF_INET);
	}

	if(lpHostEnt != NULL)
	{
		if((hServerSocket = socket(PF_INET,SOCK_STREAM,0)) != INVALID_SOCKET)
		{
			if(nPort)nProtocolPort = htons(nPort);
			else
			{
				lpServEnt = getservbyname("mail",0);
				if(lpServEnt == NULL)nProtocolPort = htons(25);
				else nProtocolPort = lpServEnt->s_port;
			}

			sockAddr.sin_family = AF_INET;
			sockAddr.sin_port = nProtocolPort;
			sockAddr.sin_addr = *((LPIN_ADDR)*lpHostEnt->h_addr_list);
			if(connect(hServerSocket,(PSOCKADDR)&sockAddr,sizeof(sockAddr)) == SOCKET_ERROR)
			{
				m_nError = CSMTP_WSA_CONNECT;
				hServerSocket = INVALID_SOCKET;
			}
		}
		else
		{
			m_nError = CSMTP_WSA_INVALID_SOCKET;
			return INVALID_SOCKET;
		}
	}
	else
	{
		m_nError = CSMTP_WSA_GETHOSTBY_NAME_ADDR;
		return INVALID_SOCKET;
	}

	return hServerSocket;
}

// connecting to remote host
CString sServer = "smtp.gmail.com";
if((m_hSocket = ConnectRemoteServer(sServer,25)) == INVALID_SOCKET)
{
    m_nError = CSMTP_WSA_INVALID_SOCKET;
    return FALSE;
}