Question

请帮助将此PHP更改为Delphi。这里有一个类似的问题：Porting PHP code to Delphi code

<?php
$fp = @fsockopen("udp://ru5-dayz.myfabis.ru", 2302, $errno, $errstr, 1);
fwrite($fp, "\xFE\xFD\x00\x21\x21\x21\x21\xFF\x00\x00\x00");
$buffer = fread($fp, 4096);
$buffer = substr($buffer, 5, -2);
if (!$buffer) { return FALSE; };
$item = explode("\x00", $buffer);
var_dump($item);
?>

到目前为止，这是我的尝试：

UdpSocket1.BlockMode := bmNonBlocking;
UdpSocket1.RemoteHost := arr[combobox2.ItemIndex][1];
UdpSocket1.RemotePort := arr[combobox2.ItemIndex][2];
UdpSocket1.Open;
UdpSocket1.Sendln('þý!!!!ÿ', ' ');
UdpSocket1.ReceiveBuf(tempS, 4096);
UdpSocket1.WaitForData(1000);
Memo1.Text := '';

Answer 1

选择File -> New -> Console Application - Delphi，然后复制并粘贴以下代码。

注意：在Delphi 2010下为我工作。

program Project1;

{$APPTYPE CONSOLE}

uses
   SysUtils // misc
  ,IdUDPClient // UDP Client
  ;

procedure DumpBytes(const Value: TBytes; const ACount: Integer);
const
  CLINE_BREAK_AT = 10;
var
  Index: Integer;
  LHex: string;
  LBreakCnt: Integer;
begin
  Writeln('Response dump');
  Writeln(StringOfChar('-', 50));

  LHex := EmptyStr;
  LBreakCnt := 0;
  for Index := Low(Value) to ACount -1 do begin
    LHex := LHex + '0x' + IntToHex(Value[Index], 2) + ' ';
    Inc(LBreakCnt);
    if LBreakCnt = CLINE_BREAK_AT then begin
      Writeln(LHex);
      LBreakCnt := 0;
      LHex := EmptyStr;
    end;
  end;
  Writeln(StringOfChar('-', 50));
end;

procedure DoTheDo;
var
  LClient: TIdUDPClient;
  LRequest: TBytes;
  LResponse: TBytes;
  LReadBytes: Integer;
begin
  LClient := TIdUDPClient.Create(NIL);
  try
    LClient.Host := 'ru5-dayz.myfabis.ru';
    LClient.Port := 2302;
    LClient.Connect;
    if LClient.Connected then begin
      Writeln('Connection established to: ', LClient.Host, ' on port: ', LClient.Port);
      LRequest := TBytes.Create($FE,$FD,$00,$21,$21,$21,$21,$FF,$00,$00,$00);
      LClient.SendBuffer(LClient.Host, LClient.Port, LRequest);
      SetLength(LResponse, 4096);
      LReadBytes := LClient.ReceiveBuffer(LResponse, 1000);
      Writeln('Received: ', LReadBytes, ' bytes');
      DumpBytes(LResponse, LReadBytes);
    end else
      Writeln('woops! can''t connect!!');
  finally
    LClient.Free;
  end; // tryf
end;

begin
  try
    WriteLn('Press [Enter] to begin...');
    ReadLn;
    ///
    ///  main procedure
    ///
    DoTheDo;
    ///
    ///  give the user time to see what happened
    ///
    Readln;
  except
    on E: Exception do begin
      Writeln('Ouch! ', E.ClassName, ': ', E.Message);
      ReadLn;
    end;
  end;
end.

将PHP代码移植到Delphi代码

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