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9.0

Use member s_aliases of servent record ( by using getservbyname function )

Asked by ikaros23 in Delphi Database, Delphi Programming, Delphi Curiosities

Tags: Delphi

I want to use servent record in my application.

   I declare Alias : PPChar;, but after calling getservbyname function when I try to get the value for s_aliases member I get a "Incompatible types : PPChar and Pointer " error message.

    The funny thing is that if I write something in Project-> Options -> Build Events -> Pre-build commands the project compiles just fine.... (By saying something I don't mean something meaningful .. any blabla will do the job )

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program test;
 
{$APPTYPE CONSOLE}
 
uses
  Dialogs,
  SysUtils,
  Winsock;
 
const
  WSVersion : Word = $101;
 
var
  WSAData : TWSAData;
  Servent : PServent;
  ProtocolName: String;
  Alias : PPChar;
  Port, ServiceCount : Integer;
 
begin
  Port := 0;
  if ParamCount < 2 then begin
    WriteLn('Error - missing service port or protocol! '+#10#13+'Please supply a service name and protocol (e.g. 21 tcp');
    Halt;
  end;
 
  try
    Port := StrToInt(ParamStr(1));
    except on EConvertError do begin
      WriteLn(Format('Invalid Port %d',[Port]));
      Halt;
    end;
  end;
 
  ProtocolName := ParamStr(2);
 
  if WSAStartUp(WSVersion, WSAData) = 0 then 
    try
      Servent := getservbyport(htons(Port),PChar(ProtocolName));
      if Servent <> NIL then begin
        WriteLn(Format('Official Service Name is %s',[Servent^.s_name]));
        WriteLn(Format('Service Port is %d in network order',[Servent^.s_port]));
        WriteLn(Format('Service Port is %d in host order',[ntohs(Servent^.s_port)]));
        WriteLn(Format('Protocol is %s',[Servent^.s_proto]));
        ServiceCount := 0;
        Alias := Servent^.s_aliases;
        while Alias^ <> nil do begin
          Inc(ServiceCount);
          WriteLn(Format('Service Name [%d] is %s',[ServiceCount, Alias^]));
          Inc(Alias);
        end;
        if ServiceCount = 0 then
          WriteLn('None');
        end else
          WriteLn(Format('Call to getservbyport() failed with error: %s',[SysErrorMessage(WSAGetLastError)]));
    finally
      WSACleanUp;
    end;
  else
  WriteLn('Failed to load Winsock.');
end.
[+][-]12/17/08 10:19 AM, ID: 23196275Accepted Solution

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About this solution

Zones: Delphi Database, Delphi Programming, Delphi Curiosities
Tags: Delphi
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Solution Provided By: rllibby
Participating Experts: 1
Solution Grade: B
 
 
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