Winsock question

[AtomicChip]

I'm creating a .dll for direct SMTP services just 'cuz I'm sick and tired of the silly little Outlook box popping up every time I want to send an e-mail. I'm running into difficulty in the connection part of the dll. The socket is initalized, created, and connection info for it is all set just fine, but for some reason whenever I try to connect, I keep getting the 10060 error (Timeout). Here is the code that I have come up with. Any help here would be greatly appreciated, and worth some big starts...

#include <windows.h>
#include <winsock.h>

#define PORTNUM 5000
#define NOMANGLE

int index = 0, iReturn;
char szClientA[100];
TCHAR szClientB[100];
TCHAR szError[100];

SOCKET ServerSock = INVALID_SOCKET;
SOCKADDR_IN destination_sin;
PHOSTENT phostent = NULL;

WSADATA WSAData;

NOMANGLE int _stdcall InitSock();
NOMANGLE int _stdcall CreateSock();
NOMANGLE int _stdcall SetConnectionInfo( LPCTSTR, unsigned int );
NOMANGLE int _stdcall ConnectToServer();

NOMANGLE int _stdcall InitSock()
{
if (WSAStartup (MAKEWORD(1,1), &WSAData) != 0)
{
return -1;
exit(0);
}
return 0;
}

NOMANGLE int _stdcall CreateSock()
{
if ((ServerSock = socket (AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
{
return -1;
exit(0);
}
return 0;
}

NOMANGLE int _stdcall SetConnectionInfo( LPCTSTR hostName, unsigned int port )
{
destination_sin.sin_family = AF_INET;
if ((phostent = gethostbyname (hostName)) == NULL)
{
closesocket (ServerSock);
return -1;
exit(0);
}

memcpy ((char FAR *)&(destination_sin.sin_addr), phostent->h_addr, phostent->h_length);
destination_sin.sin_port = htons (PORTNUM);

return 0;
}

NOMANGLE int _stdcall ConnectToServer()
{

if (connect (ServerSock, (PSOCKADDR) &destination_sin, sizeof (destination_sin)) == SOCKET_ERROR)
{
closesocket (ServerSock);
return -1;
exit(0);
}
return 0;

} -----------------------------------------------
&quot;The night sky over the planet Krikkit is the least interesting sight in the entire universe.&quot;
-Hitch Hiker's Guide To The Galaxy

 

[williamu]

I think you'll find that the code is timing out due to DNS errors. You'll need to ensure that the h_name of the HOSTENT struct contains a fully qualified domain name.

Or you can create an entry in your hosts file and use that.

e.g.
xyz.xyx.xny.xx MailServer

By using MailServer for the h_name.

HTH
William
Software Engineer
ICQ No. 56047340

 

[Guest_imported]

remember: gethostbyname(char *)

thus:
LPCTSTR ~ CString *

ok so now: if your passing in a pointer to a CString, declare it as that and use this:

if you pass in CString * hostname as parameters use:

gethostbyname(hostname->GetBuffer(0));

and be sure it is a fully qualified domain...

hope that helps

[]D[][]V[][]D

 

[williamu]

It should be noted that the GetBuffer() method of the CString object requires a parameter > than 0 since the value passed is used to determine the size of the string returned and not the starting point.



William
Software Engineer
ICQ No. 56047340