Using Winsock 2.0

#1317

Author: Eduardo Jauch
Date: Wed, 21 Feb 2007 15:07

37 lines
1538 bytes

Hi!

I'm trying to do some code for use winsock.

I write this:

//---------------------------------------------------------------------------
#include <stdio.h>
#include <conio.h>
#include <winsock2.h>

#pragma argsused

int main(int argc, char* argv[])
{
   int sockfd;

   sockfd = socket(AF_INET, SOCK_STREAM, 0);

   if (sockfd == INVALID_SOCKET)
     printf("Error: %d", WSAGetLastError());
   else
     printf("OK");

   getch();

   return 0;
}
//---------------------------------------------------------------------------


But always get sockfd with a -1 value and the ESAGetLastError with the 
value 10093.

Anyone could help me to solve this?

Thanks :)

Re: Using Winsock 2.0

#1318

Author: PaoloItaly
Date: Wed, 21 Feb 2007 15:20

132 lines
4664 bytes

int myWSAErrorCode(int code)
{
  switch(code)
  {
    case WSANOTINITIALISED:
         myMessageBox("A successful WSAStartup must occur before using this 
function");
         break;

    case WSAENETDOWN:
         myMessageBox("The network subsystem has failed");
         break;

    case WSAEADDRINUSE:
         myMessageBox("The specified address is already in use");
         break;

    case WSAEINTR:
         myMessageBox("The (blocking) call was canceled through 
WSACancelBlockingCall");
         break;

    case WSAEINPROGRESS:
         myMessageBox("A blocking Windows Sockets 1.1 call is in progress,\n 
or the service provider is still processing a callback function");
         break;

    case WSAEALREADY:
         myMessageBox("A nonblocking connect call is in progress on the 
specified socket.\nNote  In order to preserve backward compatibility, this 
error is reported as WSAEINVAL\nto Windows Sockets 1.1 applications that 
link to either WINSOCK.DLL or WSOCK32.DLL.");
         break;

    case WSAEADDRNOTAVAIL:
         myMessageBox("The specified address is not available from the local 
machine");
         break;

    case WSAEAFNOSUPPORT:
         myMessageBox("Addresses in the specified family cannot be used with 
this socket");
         break;

    case WSAECONNREFUSED:
         myMessageBox("The attempt to connect was forcefully rejected");
         break;

    case WSAEFAULT:
         myMessageBox("The name or the namelen argument is not a valid part 
of\nthe user address space, the namelen argument is too small,\nor the name 
argument contains incorrect address format for the associated address 
family");
         break;

    case WSAEINVAL:
         myMessageBox("The parameter s is a listening socket, or the 
destination address specified\nis not consistent with that of the 
constrained group the socket belongs to");
         break;

    case WSAEISCONN:
         myMessageBox("The socket is already connected (connection-oriented 
sockets only)");
         break;

    case WSAENETUNREACH:
         myMessageBox("The network cannot be reached from this host at this 
time");
         break;

    case WSAENOBUFS:
         myMessageBox("No buffer space is available. The socket cannot be 
connected");
         break;

    case WSAENOTSOCK:
         myMessageBox("The descriptor is not a socket");
         break;

    case WSAETIMEDOUT:
         myMessageBox("Attempt to connect timed out without establishing a 
connection");
         break;

    case WSAEWOULDBLOCK:
         myMessageBox("The socket is marked as nonblocking and the 
connection cannot be completed immediately.\nIt is possible to select the 
socket while it is connecting by selecting it for writing");
         break;

    case WSAEACCES:
         myMessageBox("Attempt to connect datagram socket to broadcast 
address failed because\nsetsockopt SO_BROADCAST is not enabled");
         break;

    default:
         code = 0;
         break;
  }

  if(code)
    WSASetLastError(code);

  return code;
}

SOCKET openSocket(unsigned short port, char ipAddr[], struct sockaddr_in 
*addr)
{
  WORD wVersionRequested;
  WSADATA wsaData;
  SOCKET tempSock = INVALID_SOCKET;

  ::WSASetLastError(::WSAGetLastError());

  wVersionRequested = MAKEWORD(2, 0);
  if(::WSAStartup(wVersionRequested, &wsaData) == 0)
  {
    tempSock = ::socket(AF_INET, SOCK_STREAM, 0);
    if(tempSock != INVALID_SOCKET)
    {
      addr->sin_family = AF_INET;
      addr->sin_port = htons(port);
      addr->sin_addr.s_addr = inet_addr(ipAddr);
    }

    myWSAErrorCode(::WSAGetLastError());
  }

  return tempSock;
}

Re: Using Winsock 2.0

#1320

Author: Eduardo Jauch
Date: Wed, 21 Feb 2007 15:21

9 lines
1126 bytes

Never mind...

I found the problem...
Not like in linux, on windows the socket libriry must be initialized 
using WSAStartup function...

The help provides a good exemple :)

Thanks! :)

Re: Using Winsock 2.0

#1319

Author: Eduardo Jauch
Date: Wed, 21 Feb 2007 15:23

140 lines
5042 bytes

PaoloItaly escreveu:
> int myWSAErrorCode(int code)
> {
>   switch(code)
>   {
>     case WSANOTINITIALISED:
>          myMessageBox("A successful WSAStartup must occur before using this 
> function");
>          break;
> 
>     case WSAENETDOWN:
>          myMessageBox("The network subsystem has failed");
>          break;
> 
>     case WSAEADDRINUSE:
>          myMessageBox("The specified address is already in use");
>          break;
> 
>     case WSAEINTR:
>          myMessageBox("The (blocking) call was canceled through 
> WSACancelBlockingCall");
>          break;
> 
>     case WSAEINPROGRESS:
>          myMessageBox("A blocking Windows Sockets 1.1 call is in progress,\n 
> or the service provider is still processing a callback function");
>          break;
> 
>     case WSAEALREADY:
>          myMessageBox("A nonblocking connect call is in progress on the 
> specified socket.\nNote  In order to preserve backward compatibility, this 
> error is reported as WSAEINVAL\nto Windows Sockets 1.1 applications that 
> link to either WINSOCK.DLL or WSOCK32.DLL.");
>          break;
> 
>     case WSAEADDRNOTAVAIL:
>          myMessageBox("The specified address is not available from the local 
> machine");
>          break;
> 
>     case WSAEAFNOSUPPORT:
>          myMessageBox("Addresses in the specified family cannot be used with 
> this socket");
>          break;
> 
>     case WSAECONNREFUSED:
>          myMessageBox("The attempt to connect was forcefully rejected");
>          break;
> 
>     case WSAEFAULT:
>          myMessageBox("The name or the namelen argument is not a valid part 
> of\nthe user address space, the namelen argument is too small,\nor the name 
> argument contains incorrect address format for the associated address 
> family");
>          break;
> 
>     case WSAEINVAL:
>          myMessageBox("The parameter s is a listening socket, or the 
> destination address specified\nis not consistent with that of the 
> constrained group the socket belongs to");
>          break;
> 
>     case WSAEISCONN:
>          myMessageBox("The socket is already connected (connection-oriented 
> sockets only)");
>          break;
> 
>     case WSAENETUNREACH:
>          myMessageBox("The network cannot be reached from this host at this 
> time");
>          break;
> 
>     case WSAENOBUFS:
>          myMessageBox("No buffer space is available. The socket cannot be 
> connected");
>          break;
> 
>     case WSAENOTSOCK:
>          myMessageBox("The descriptor is not a socket");
>          break;
> 
>     case WSAETIMEDOUT:
>          myMessageBox("Attempt to connect timed out without establishing a 
> connection");
>          break;
> 
>     case WSAEWOULDBLOCK:
>          myMessageBox("The socket is marked as nonblocking and the 
> connection cannot be completed immediately.\nIt is possible to select the 
> socket while it is connecting by selecting it for writing");
>          break;
> 
>     case WSAEACCES:
>          myMessageBox("Attempt to connect datagram socket to broadcast 
> address failed because\nsetsockopt SO_BROADCAST is not enabled");
>          break;
> 
>     default:
>          code = 0;
>          break;
>   }
> 
>   if(code)
>     WSASetLastError(code);
> 
>   return code;
> }
> 
> SOCKET openSocket(unsigned short port, char ipAddr[], struct sockaddr_in 
> *addr)
> {
>   WORD wVersionRequested;
>   WSADATA wsaData;
>   SOCKET tempSock = INVALID_SOCKET;
> 
>   ::WSASetLastError(::WSAGetLastError());
> 
>   wVersionRequested = MAKEWORD(2, 0);
>   if(::WSAStartup(wVersionRequested, &wsaData) == 0)
>   {
>     tempSock = ::socket(AF_INET, SOCK_STREAM, 0);
>     if(tempSock != INVALID_SOCKET)
>     {
>       addr->sin_family = AF_INET;
>       addr->sin_port = htons(port);
>       addr->sin_addr.s_addr = inet_addr(ipAddr);
>     }
> 
>     myWSAErrorCode(::WSAGetLastError());
>   }
> 
>   return tempSock;
> }
> 
> 


HeY!!!

Thanks Paolo!!! :)

Re: Using Winsock 2.0

#1322

Author: Remy Lebeau (TeamB)
Date: Wed, 21 Feb 2007 18:28

21 lines
1427 bytes

"Eduardo Jauch" <eduardo.jauch@gmail.com> wrote in message
news:45dc601b$1@newsgroups.borland.com...

>    int sockfd;

socket() returns a SOCKET handle, not an int.

>    sockfd = socket(AF_INET, SOCK_STREAM, 0);

You did not call WSAStartup() before calling socket().  You must do
so, in order to specify the version of WinSock that you want to use,
and to validate that it is actually available.

> But always get sockfd with a -1 value and the ESAGetLastError
> with the value 10093.

10093 is WSANOTINITIALISED.


Gambit

Re: Using Winsock 2.0

#1323

Author: Remy Lebeau (TeamB)
Date: Wed, 21 Feb 2007 18:29

12 lines
1177 bytes

"Eduardo Jauch" <eduardo.jauch@gmail.com> wrote in message
news:45dc63c7$1@newsgroups.borland.com...

> HeY!!!
>
> Thanks Paolo!!! :)

For future reference, please trim your replies.  Do not overquote.


Gambit

Re: Using Winsock 2.0

#1328

Author: Eduardo Jauch
Date: Thu, 22 Feb 2007 00:48

6 lines
1146 bytes

Remy Lebeau (TeamB) escreveu:
  > For future reference, please trim your replies.  Do not overquote.
> 

Sorry. :)
I'll remember that :)

Re: Using Winsock 2.0

#1327

Author: Eduardo Jauch
Date: Thu, 22 Feb 2007 00:49

17 lines
1286 bytes

Remy Lebeau (TeamB) escreveu:
> socket() returns a SOCKET handle, not an int.

Ok :)
> 
> You did not call WSAStartup() before calling socket().  You must do
> so, in order to specify the version of WinSock that you want to use,
> and to validate that it is actually available.

Yes. That was my fault. :)

> 10093 is WSANOTINITIALISED.
> 

Now I know ;)

Thanks :)

🚀 go-pugleaf

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