IdUDPClient和IdUDPServer实现最简单的功能,但还是有问题,分不多了,望帮忙

[mysisc]

IdUDPClient和IdUDPServer实现最简单的功能,但还是有问题：

Client和server都设了一样的端口，client设了server的IP,并且都active=true了


UDP的Client端有一定时器(每秒)读取收到的数据,如下:
procedure TForm1.Timer1Timer(Sender: TObject);
var
s:string;
begin
s:=IdUDPClient1.ReceiveString();
if s<>'' then
listbox1.Items.Add(s);
end;


UDP的server端有一按钮发送给client的数据:

procedure TForm1.Button1Click(Sender: TObject);
begin
IdUDPServer1.Send('192.100.100.121',9903,'abcd');
end;

问题：
client收不到server的数据，而且定时器使程序变得很慢

[waterapple]

关注......

[fj_abin]

用IdUDPClient实现数据的发送，用IdUDPServer接收数据，当IdUDPClient发送数据后，IdUDPServer的OnUDPRead事件中就可以接收到你发送的数据，根本没必要用timer。 建议你找个IdUDPClient和IdUDPServer控件demo例子好好看看。

[wzyamx]

客户端：
var
cmd: string;
ASize, TotalSize: Int64;
AFileStream: TFileStream;
begin
IdTCPClient1.Host := Edit1.Text; //连接主机
IdTCPClient1.Port := StrToIntDef(Edit2.Text, 9925); //端口
IdTCPClient1.Connect; //连接
try
IdTCPClient1.WriteLn('BEGIN'); //提示服务器开始接收
cmd := IdTCPClient1.ReadLn;
//以“|”符号分离文件名
SaveDialog1.FileName := Copy(cmd, Pos('|', cmd) + 1, Length(cmd));
if not SaveDialog1.Execute then
begin
IdTCPClient1.WriteLn('CANCEL'); //告诉服务器取消
IdTCPClient1.Disconnect; //断开连接
exit;
end;
TotalSize := StrToInt(Copy(cmd, 0, Pos('|', cmd) - 1)); //分离文件大小
//建立文件流准备接收
AFileStream := TFileStream.Create(SaveDialog1.FileName, fmCreate);
try //循环开始接受
repeat
IdTCPClient1.WriteLn(IntToStr(AFileStream.Size));//发送当前传输的位置
ASize := Min(TotalSize - AFileStream.Size, IdTCPClient1.RecvBufferSize);
//选择剩余大小和缓冲区大小小的一个作为传输的大小
IdTCPClient1.ReadStream(AFileStream, ASize); //接收流
StatusBar1.SimpleText := Format('当前传输位置%d/大小%d', [AFileStream.Size, TotalSize]);
Application.ProcessMessages;
until AFileStream.Size = TotalSize; //大小一致了表示结束
finally
AFileStream.Free; //释放文件流
end;
IdTCPClient1.WriteLn('END'); //提示服务器传输完成
StatusBar1.SimpleText := '传输完成...';
except
StatusBar1.SimpleText := '连接服务器失败或者对方已经中断传输！';
end;
IdTCPClient1.Disconne

[wzyamx]

服务器：
procedure Tfrm_Server.IdTCPServer1Execute(AThread: TIdPeerThread);
var
cmd: string; //接收到客户端的字符串信息
ASize: Integer; //需要传输的流大小
begin
with AThread.Connection do //已经连街上的一个进程
begin
cmd := UpperCase(ReadLn); //客户端发送的命令字符串
if cmd = 'BEGIN' then //开始传输
begin
//告诉远程传输文件的大小和文件名
WriteLn(Format('%d|%s', [AFileStream.Size, ExtractFileName(Edit1.Text)]));
StatusBar1.SimpleText := '准备传输...';
Exit;
end;
if cmd = 'END' then
begin //传输完成
Button3.Click;
StatusBar1.SimpleText := '传输完成...';
Exit;
end;
if cmd = 'CANCEL' then
begin //传输取消
StatusBar1.SimpleText := '传输取消...';
//保持传输状态
Exit;
end;
//按照指定位置传输文件
AFileStream.Seek(StrToInT(cmd), soFromBeginning); //转到文件流传输的位置
ASize := Min(AFileStream.Size - AFileStream.Position, RecvBufferSize);
//计算需要发送的大小，Min()函数在Math单元
OpenWriteBuffer; //准备发送缓冲
WriteStream(AFileStream, false, false, ASize);
//注意这个函数的参数。
CloseWriteBuffer; //结束发送缓冲
StatusBar1.SimpleText := Format('当前传输位置%s/大小%d', [cmd, AFileStream.Size]);
ProgressBar1.Position := ProgressBar1.Position + ASize;
end;
end;

[vinsonshen]

UP

[jtnetcom]

Simple UDP client demo

Verified;
Indy 9:
D7: 25th Oct 2004 Andy Neillans
}


unit UDPClientMain;

interface

uses
Windows, Messages, Graphics, Controls, Forms, Dialogs, IdWinsock2, stdctrls,
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

{$R *.DFM}

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.

[jtnetcom]

Notes:

Simple UDP server demo

Verified:
Indy 9:
D7: 25th Oct 2004 Andy Neillans

}

unit UDPServerMain;

interface

uses
Windows, Messages, Graphics, Controls, Forms, Dialogs, IdWinsock2, stdctrls,
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;

{$R *.DFM}

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.

[newyu1127]

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