fpConnect always returns 0
lazarus / 38-Networking and Web Programming

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Aidex · 2019-01-24 18:52

Hi! I try to connect to a server via socket and fpConnect().
But fpConnect() always results zero.
In case of an error, fpConnect should return -1, but it is zero. And
zero is not a valid handle. SocketError is also zero.
I'm using Lazarus 1.8.4 on Windows 7 64.
Does anyone know any advice? Thank you!

uses sockets, resolve;

var
  ip4: resolve.THostAddr;
  Port: Word;
  addr: SockAddr;
  SocketHandle, ConnHandle: LongInt;

begin
  [ ... defining ip4 and Port ... ]

  SocketHandle := fpSocket(AF_INET,SOCK_STREAM,0);
  if SocketHandle=-1 then Exit(false);

  initialize(addr);
  addr.sin_family := AF_INET;
  addr.sin_port := htons(Port);
  addr.sin_addr.s_addr := htonl(ip4.s_addr);

  ConnHandle := fpConnect(SocketHandle,@addr,SizeOf(addr));
  ...

=> ConnHandle==0 and SocketError==0

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engkin · 2019-01-24 19:33

"The fpConnect function returns zero if the call was successfull, -1
in case of error."

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Aidex · 2019-01-24 23:18

My best thanks, I'm very embarrassed. I had convinced myself that
fpConnect would return a new handle, just like fpAccept.
But instead I just have to continue using the SocketHandle. So simple.
Now it works. Thanks a lot!