急！有关Indy UDP 的问题：为什么别人发给我的我收得到，我发给别人的别人收不到？

pfriend21 2003-08-30 10:19:54

我使用Delphi6的Demo，修改了IdUDPClient中的IP地址后他发给我的我能收到，我发给他的却不能收到，不知道为什么啊
IP从QQ上获取：我的218.85.251.75:4001
他的：61.183.235.161:10928
是不是因为他的端口太奇怪了？

******Client*******

object UDPAntiFreeze: TIdAntiFreeze
OnlyWhenIdle = False
Left = 268
Top = 16
end
object UDPClient: TIdUDPClient
Host = '218.6.48.133'
Port = 8090
ReceiveTimeout = 0
Left = 240
Top = 16
end
{***************************************************************
*
* Project : UDPClient
* Unit Name: UDPClientMain
* Purpose : UDP demo - client project
* Version : 1.0
* Date : Wed 25 Apr 2001 - 01:44:24
* Author : <unknown>
* History :
* Tested : Wed 25 Apr 2001 // Allen O'Neill <allen_oneill@hotmail.com>
*
****************************************************************}

unit UDPClientMain;

interface

uses
{$IFDEF Linux}
QGraphics, QControls, QForms, QDialogs, QStdCtrls,
{$ELSE}
windows, messages, graphics, controls, forms, dialogs, Winsock, stdctrls,
{$ENDIF}
SysUtils, Classes, IdBaseComponent, IdAntiFreezeBase, IdAntiFreeze,
IdComponent, IdUDPBase, IdUDPClient, IdStack;

type
TUDPMainForm = class(TForm)
SourceGroupBox: TGroupBox;
HostNameLabel: TLabel;
HostAddressLabel: TLabel;
HostName: TLabel;
HostAddress: TLabel;
UDPAntiFreeze: TIdAntiFreeze;
PortLabel: TLabel;
Port: TLabel;
DestinationLabel: TLabel;
DestinationAddress: TLabel;
BufferSizeLabel: TLabel;
BufferSize: TLabel;
UDPMemo: TMemo;
SendButton: TButton;
UDPClient: TIdUDPClient;
procedure FormCreate(Sender: TObject);
procedure SendButtonClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
UDPMainForm: TUDPMainForm;

implementation

const
HOSTNAMELENGTH = 80;
RECIEVETIMEOUT = 5000; // milliseconds

{$IFDEF MSWINDOWS}{$R *.dfm}{$ELSE}{$R *.xfm}{$ENDIF}

procedure TUDPMainForm.FormCreate(Sender: TObject);
begin
Randomize; // remove if you want reproducible results.
HostName.Caption := UDPClient.LocalName;
HostAddress.Caption := GStack.LocalAddress;
Port.Caption := IntToStr(UDPClient.Port);
DestinationAddress.Caption := UDPClient.Host;
BufferSize.Caption := IntToStr(UDPClient.BufferSize);
UDPClient.ReceiveTimeout := RECIEVETIMEOUT;
end;

procedure TUDPMainForm.SendButtonClick(Sender: TObject);
var
MessageID: Integer;
ThisMessage: String;
ReceivedString: String;
begin
MessageID := Random(MAXINT);
ThisMessage := 'Message: ' + IntToStr(MessageID);
UDPMemo.Lines.Add('Sending ' + ThisMessage);
UDPClient.Send(ThisMessage);
ReceivedString := UDPClient.ReceiveString();
if ReceivedString = '' then
UDPMemo.Lines.Add('No response received from the server after ' + IntToStr(UDPClient.ReceiveTimeout) + ' millseconds.')
else
UDPMemo.Lines.Add('Received: ' + ReceivedString)
end;

end.

object UDPServer: TIdUDPServer
Bindings = <>
DefaultPort = 8090
OnUDPRead = UDPServerUDPRead
Left = 240
Top = 16
end
object UDPAntiFreeze: TIdAntiFreeze
OnlyWhenIdle = False
Left = 268
Top = 16
end
******Server*******
{***************************************************************
*
* Project : UDPServer
* Unit Name: UDPServerMain
* Purpose : UDP demo - server project
* Version : 1.0
* Date : Wed 25 Apr 2001 - 01:43:04
* Author : <unknown>
* History :
* Tested : Wed 25 Apr 2001 // Allen O'Neill <allen_oneill@hotmail.com>
*
****************************************************************}

unit UDPServerMain;

interface

uses
{$IFDEF Linux}
QGraphics, QControls, QForms, QDialogs, QStdCtrls,
{$ELSE}
windows, messages, graphics, controls, forms, dialogs, IdWinsock, stdctrls,
{$ENDIF}
SysUtils, Classes, IdBaseComponent, IdAntiFreezeBase, IdAntiFreeze,
IdComponent, IdUDPBase, IdUDPClient, IdStack, IdUDPServer, IdSocketHandle;

type
TUDPMainForm = class(TForm)
SourceGroupBox: TGroupBox;
HostNameLabel: TLabel;
HostAddressLabel: TLabel;
HostName: TLabel;
HostAddress: TLabel;
UDPServer: TIdUDPServer;
UDPAntiFreeze: TIdAntiFreeze;
PortLabel: TLabel;
Port: TLabel;
BufferSizeLabel: TLabel;
BufferSize: TLabel;
UDPMemo: TMemo;
procedure FormCreate(Sender: TObject);
procedure UDPServerUDPRead(Sender: TObject; AData: TStream; ABinding: TIdSocketHandle);
private
{ Private declarations }
public
{ Public declarations }
end;

var
UDPMainForm: TUDPMainForm;

implementation

const
HOSTNAMELENGTH = 80;

{$IFDEF MSWINDOWS}{$R *.dfm}{$ELSE}{$R *.xfm}{$ENDIF}

procedure TUDPMainForm.FormCreate(Sender: TObject);
begin
HostName.Caption := UDPServer.LocalName;
HostAddress.Caption := GStack.LocalAddress;
Port.Caption := IntToStr(UDPServer.DefaultPort);
BufferSize.Caption := IntToStr(UDPServer.BufferSize);
UDPServer.Active := True;
end;

procedure TUDPMainForm.UDPServerUDPRead(Sender: TObject; AData: TStream; ABinding: TIdSocketHandle);
var
DataStringStream: TStringStream;
s: String;
begin
DataStringStream := TStringStream.Create('');
try
DataStringStream.CopyFrom(AData, AData.Size);
UDPMemo.Lines.Add('Received "' + DataStringStream.DataString + '" from ' + ABinding.PeerIP + ' on port ' + IntToStr(ABinding.PeerPort));
s := 'Replied from ' + UDPServer.LocalName + ' to "' + DataStringStream.DataString + '"';
ABinding.SendTo(ABinding.PeerIP, ABinding.PeerPort, s[1], Length(s));
finally
DataStringStream.Free;
end;
end;

end.

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