4.Linux環(huán)境下Tcp Socket 編程

在 Linux 環(huán)境下使用 Indy 組件進行 TCP Socket 編程也非常的簡單，一般情況下，Linux 下編寫 TCP Socket 應(yīng)用程序是不需要有 UI 的，所以，今天我們一起來在 Linux 環(huán)境下實現(xiàn)一個 shell 命令行的 TCP Socket 應(yīng)用程序。

在 Linux 環(huán)境下編寫 Object Pascal 程序，就需要使用 Lazarus 或者 CodeTyphon 了，我們在本節(jié)使用 CodeTyphon 來編寫，同時在 Linux 下編寫 shell 命令行程序，日志系統(tǒng)是不可缺少的，所以，我先介紹 Lazarus 下的日志系統(tǒng)。

4.1 Lazarus Logger

在 Lazarus 中， TEventLog 是一個可用于向系統(tǒng)日志發(fā)送消息的組件。如果不存在系統(tǒng)日志（例如在 Windows 95/98 或 DOS 上），則將消息寫入文件。消息可以使用一般的 Log 調(diào)用，或?qū)ｉT的 Warning、Error、Info或Debug調(diào)用來記錄，這些調(diào)用具有預(yù)定義的事件類型。

TEventLog 的主要屬性：

• LogType – 日志類型，取值： ltSystem | ltFile | ItStdErr | ItStdOut
• FileName – 日志文件名
• DefaultEventType – 默認事件類型，取值：etCustom | etInfo | etWarning |etError | etDebug
• AppendContent – 控制是否將輸出附加到現(xiàn)有文件
• Active – 激活日志機制，取值為布爾型
• TimeStampFormat – 時間戳字符串的格式

TEventLog 的主要方法：

4.2 Tcp Socket 服務(wù)端

在 Linux shell 下開發(fā) Tcp Socket 服務(wù)端，需要創(chuàng)建一個 Console Application，然后新建的應(yīng)用程序類中編寫代碼。仍然采用上一節(jié)的示例來說明。

示例：客戶端定時實時檢測所在機器的屏幕分辨率上行到服務(wù)端，服務(wù)端接收到數(shù)據(jù)后，根據(jù)其屏幕分辨率隨機生成一個坐標并下發(fā)給客戶端，客戶端將應(yīng)用程序的窗體位置放置到相應(yīng)的坐標上。

客戶端代碼仍然是上一節(jié)的代碼，在此不再贅述。

首先，打開 CodeTyphon，選擇 Project -> New Project，然后選擇 Console Application，設(shè)置 Application class name 和 Title，單擊 Ok，此時生成的代碼如下：

program Project1;{$mode objfpc}{$H+}uses {$IFDEF UNIX} cthreads, {$ENDIF} Classes, SysUtils, CustApp { you can add units after this };type { TTcpApplication } TTcpApplication = class(TCustomApplication) protected procedure DoRun; override; public constructor Create(TheOwner: TComponent); override; destructor Destroy; override; procedure WriteHelp; virtual; end;{ TTcpApplication }procedure TTcpApplication.DoRun;var ErrorMsg: String;begin // quick check parameters ErrorMsg:=CheckOptions(‘h’, ‘help’); if ErrorMsg” then begin ShowException(Exception.Create(ErrorMsg)); Terminate; Exit; end; // parse parameters if HasOption(‘h’, ‘help’) then begin WriteHelp; Terminate; Exit; end; { add your program here } // stop program loop Terminate;end;constructor TTcpApplication.Create(TheOwner: TComponent);begin inherited Create(TheOwner); StopOnException:=True;end;destructor TTcpApplication.Destroy;begin inherited Destroy;end;procedure TTcpApplication.WriteHelp;begin { add your help code here } writeln(‘Usage: ‘, ExeName, ‘ -h’);end;var Application: TTcpApplication;begin Application:=TTcpApplication.Create(nil); Application.Title:=’Tcp Application’; Application.Run; Application.Free;end.

生成的代碼為設(shè)置的類名的類代碼，其中：

• WriteHelp – 輸出幫助信息
• DoRun – 該程序的主要執(zhí)行代碼

下面，我們根據(jù)需求來實現(xiàn) Tcp Server 的功能，由于需要在程序執(zhí)行過程中記錄日志，所以先在該類的聲明部分添加日志和 TIdTCPServer 變量，如下代碼：

private TcpServer: TIdTCPServer; Logger: TEventLog;

接下來，聲明日志輸出功能和 Tcp Server 需要實現(xiàn)的事件處理功能，對于日志，我們需要輸出消息類數(shù)據(jù)和錯誤類信息，代碼如下：

procedure OutputInfoLog(Info: String); // 消息日志procedure OutputErrorLog(Error: String); // 錯誤日志procedure ServeExecute(AContext: TIdContext); // 與客戶端交互數(shù)據(jù)procedure ServeConnecte(AContext: TIdContext); // 客戶端建立連接時觸發(fā)procedure ServeDisconnect(AContext: TIdContext); // 客戶端斷開連接時觸發(fā)procedure ServeException(AContext: TIdContext; AException: Exception); // 與客戶端交互發(fā)生異常時觸發(fā)

實現(xiàn)日志輸出功能：

procedure TTcpApplication.OutputInfoLog(Info: String);var LogContent: String;begin LogContent:=FormatDateTime(‘yyyy-mm-dd hh:nn:ss:zzz’, Now) + ‘ -info- ‘ + Info; Writeln(LogContent); Logger.Info(LogContent);end;procedure TTcpApplication.OutputErrorLog(Error: String);var LogContent: String;begin LogContent:=FormatDateTime(‘yyyy-mm-dd hh:nn:ss:zzz’, Now) + ‘ -error- ‘ + Error; Writeln(LogContent); Logger.Info(LogContent);end;

實現(xiàn)客戶端建立連接、斷開連接、發(fā)生異常時觸發(fā)的事件：

procedure TTcpApplication.ServeConnecte(AContext: TIdContext);var Info: String;begin // 連接 Info := AContext.Connection.Socket.Binding.PeerIP + ‘:’ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – has created connection.’; OutputInfoLog(Info);end;procedure TTcpApplication.ServeDisconnect(AContext: TIdContext);var Info: String;begin // 斷開連接 Info := AContext.Connection.Socket.Binding.PeerIP + ‘:’ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – has closed connection.’; OutputInfoLog(Info);end;procedure TTcpApplication.ServeException(AContext: TIdContext; AException: Exception);var Info: String;begin // 異常 Info := AContext.Connection.Socket.Binding.PeerIP + ‘ ‘ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – Error: ‘ + AException.Message; OutputErrorLog(Info);end;

定義交互數(shù)據(jù)結(jié)構(gòu)：

// 通信數(shù)據(jù)結(jié)構(gòu) TCommBlock = Record Part: String[1]; // 客戶端上傳: W-屏幕寬度, H-屏幕高度, E-結(jié)束; 服務(wù)端下發(fā): X-水平坐標, Y-垂直坐標, E-結(jié)束 Desc: String[16]; // 描述 Value: Integer; // 數(shù)據(jù)值 end;

實現(xiàn)數(shù)據(jù)交互功能：

procedure TTcpApplication.ServeExecute(AContext: TIdContext);var CommBlock: TCommBlock; bytes: TIdBytes; W, H, X, Y: Integer; Host: String;begin // 執(zhí)行 if AContext.Connection.Connected then begin try OutputInfoLog(‘—– Start —–‘); Host:=AContext.Connection.Socket.Binding.PeerIP; AContext.Connection.IOHandler.ReadBytes(bytes, SizeOf(CommBlock), False); BytesToRaw(bytes, CommBlock, SizeOf(CommBlock)); OutputInfoLog(‘Recv – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); if CommBlock.Part = ‘W’ then W:=CommBlock.Value; if CommBlock.Part = ‘H’ then H:=CommBlock.Value; if CommBlock.Part = ‘E’ then begin Randomize; X:=Random(W); Y:=Random(H); // 發(fā)送水平坐標 CommBlock.Part:=’X’; CommBlock.Desc:=’水平坐標’; CommBlock.Value:=X; OutputInfoLog(‘Send – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); AContext.Connection.IOHandler.Write(RawToBytes(CommBlock, SizeOf(CommBlock))); // 發(fā)送垂直坐標 CommBlock.Part:=’Y’; CommBlock.Desc:=’垂直坐標’; CommBlock.Value:=Y; OutputInfoLog(‘Send – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); AContext.Connection.IOHandler.Write(RawToBytes(CommBlock, SizeOf(CommBlock))); // 發(fā)送結(jié)束標志 CommBlock.Part:=’E’; CommBlock.Desc:=’結(jié)束’; CommBlock.Value:=0; OutputInfoLog(‘Send – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); AContext.Connection.IOHandler.Write(RawToBytes(CommBlock, SizeOf(CommBlock))); end; except ON E: Exception do OutputErrorLog(‘ERROR: ‘ + Host + ‘ – ‘ + E.Message); end; end;end;

實現(xiàn)主程序：

// 日志初始化Logger:=TEventLog.Create(Self);Logger.FileName:=’tcp_serve.log’;Logger.LogType:=ltFile;Logger.DefaultEventType:=etDebug;Logger.AppendContent:=True;Logger.Active:=True;// Server 端初始化TcpServer:=TIdTCPServer.Create(Self);TcpServer.DefaultPort:=8081;// 設(shè)置 Server 端事件處理TcpServer.OnConnect:=@ServeConnecte;TcpServer.OnDisconnect:=@ServeDisconnect;TcpServer.OnExecute:=@ServeExecute;TcpServer.OnException:=@ServeException;// 啟動 ServerTcpServer.StartListening;TcpServer.Active:=True;OutputInfoLog(‘Started at 8081’); while True do readln();// 釋放資源 Logger.Destroy;TcpServer.StopListening;TcpServer.Destroy; // stop program loopTerminate;

完整代碼如下：

program ct1203;{$mode objfpc}{$H+}uses {$IFDEF UNIX} cthreads, {$ENDIF} Classes, SysUtils, CustApp, IdTCPServer, IdContext, IdGlobal, EventLog { you can add units after this };type { TTcpApplication } TTcpApplication = class(TCustomApplication) private TcpServer: TIdTCPServer; Logger: TEventLog; protected procedure DoRun; override; procedure OutputInfoLog(Info: String); procedure OutputErrorLog(Error: String); procedure ServeExecute(AContext: TIdContext); procedure ServeConnecte(AContext: TIdContext); procedure ServeDisconnect(AContext: TIdContext); procedure ServeException(AContext: TIdContext; AException: Exception); public constructor Create(TheOwner: TComponent); override; destructor Destroy; override; // procedure WriteHelp; virtual; end; // 通信數(shù)據(jù)結(jié)構(gòu) TCommBlock = Record Part: String[1]; // 客戶端上傳: W-屏幕寬度, H-屏幕高度, E-結(jié)束; 服務(wù)端下發(fā): X-水平坐標, Y-垂直坐標, E-結(jié)束 Desc: String[16]; // 描述 Value: Integer; // 數(shù)據(jù)值 end;{ TTcpApplication }procedure TTcpApplication.OutputInfoLog(Info: String);var LogContent: String;begin LogContent:=FormatDateTime(‘yyyy-mm-dd hh:nn:ss:zzz’, Now) + ‘ -info- ‘ + Info; Writeln(LogContent); Logger.Info(LogContent);end;procedure TTcpApplication.OutputErrorLog(Error: String);var LogContent: String;begin LogContent:=FormatDateTime(‘yyyy-mm-dd hh:nn:ss:zzz’, Now) + ‘ -error- ‘ + Error; Writeln(LogContent); Logger.Info(LogContent);end;procedure TTcpApplication.ServeConnecte(AContext: TIdContext);var Info: String;begin // 連接 Info := AContext.Connection.Socket.Binding.PeerIP + ‘:’ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – has created connection.’; OutputInfoLog(Info);end;procedure TTcpApplication.ServeDisconnect(AContext: TIdContext);var Info: String;begin // 斷開連接 Info := AContext.Connection.Socket.Binding.PeerIP + ‘:’ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – has closed connection.’; OutputInfoLog(Info);end;procedure TTcpApplication.ServeException(AContext: TIdContext; AException: Exception);var Info: String;begin // 異常 Info := AContext.Connection.Socket.Binding.PeerIP + ‘ ‘ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – Error: ‘ + AException.Message; OutputErrorLog(Info);end;procedure TTcpApplication.ServeExecute(AContext: TIdContext);var CommBlock: TCommBlock; bytes: TIdBytes; W, H, X, Y: Integer; Host: String;begin // 執(zhí)行 if AContext.Connection.Connected then begin try OutputInfoLog(‘—– Start —–‘); Host:=AContext.Connection.Socket.Binding.PeerIP; AContext.Connection.IOHandler.ReadBytes(bytes, SizeOf(CommBlock), False); BytesToRaw(bytes, CommBlock, SizeOf(CommBlock)); OutputInfoLog(‘Recv – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); if CommBlock.Part = ‘W’ then W:=CommBlock.Value; if CommBlock.Part = ‘H’ then H:=CommBlock.Value; if CommBlock.Part = ‘E’ then begin Randomize; X:=Random(W); Y:=Random(H); // 發(fā)送水平坐標 CommBlock.Part:=’X’; CommBlock.Desc:=’水平坐標’; CommBlock.Value:=X; OutputInfoLog(‘Send – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); AContext.Connection.IOHandler.Write(RawToBytes(CommBlock, SizeOf(CommBlock))); // 發(fā)送垂直坐標 CommBlock.Part:=’Y’; CommBlock.Desc:=’垂直坐標’; CommBlock.Value:=Y; OutputInfoLog(‘Send – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); AContext.Connection.IOHandler.Write(RawToBytes(CommBlock, SizeOf(CommBlock))); // 發(fā)送結(jié)束標志 CommBlock.Part:=’E’; CommBlock.Desc:=’結(jié)束’; CommBlock.Value:=0; OutputInfoLog(‘Send – ‘ + Host + ‘ ‘ + CommBlock.Desc + ‘: ‘ + inttostr(CommBlock.Value)); AContext.Connection.IOHandler.Write(RawToBytes(CommBlock, SizeOf(CommBlock))); end; except ON E: Exception do OutputErrorLog(‘ERROR: ‘ + Host + ‘ – ‘ + E.Message); end; end;end;procedure TTcpApplication.DoRun;// var // ErrorMsg: String;begin // quick check parameters (*ErrorMsg:=CheckOptions(‘h’, ‘help’); if ErrorMsg” then begin ShowException(Exception.Create(ErrorMsg)); Terminate; Exit; end;*) // parse parameters (*if HasOption(‘h’, ‘help’) then begin WriteHelp; Terminate; Exit; end;*) { add your program here } Logger:=TEventLog.Create(Self); Logger.FileName:=’tcp_serve.log’; Logger.LogType:=ltFile; Logger.DefaultEventType:=etDebug; Logger.AppendContent:=True; // Logger.TimeStampFormat:=’yyyy-mm-dd hh:nn:ss:zzz’; Logger.Active:=True; TcpServer:=TIdTCPServer.Create(Self); TcpServer.DefaultPort:=8081; TcpServer.OnConnect:=@ServeConnecte; TcpServer.OnDisconnect:=@ServeDisconnect; TcpServer.OnExecute:=@ServeExecute; TcpServer.OnException:=@ServeException; TcpServer.StartListening; TcpServer.Active:=True; OutputInfoLog(‘Started at 8081’); while True do readln(); Logger.Destroy; TcpServer.StopListening; TcpServer.Destroy; // stop program loop Terminate;end;constructor TTcpApplication.Create(TheOwner: TComponent);begin inherited Create(TheOwner); StopOnException:=True;end;destructor TTcpApplication.Destroy;begin inherited Destroy;end;(*procedure TTcpApplication.WriteHelp;begin { add your help code here } writeln(‘Usage: ‘, ExeName, ‘ -h’);end;*)var Application: TTcpApplication;begin Application:=TTcpApplication.Create(nil); Application.Title:=’Tcp Application’; Application.Run; Application.Free;end.

程序運行效果：

[2022-06-25 10:30:07.442 Info] 2022-06-25 10:30:07:442 -info- Started at 8081 [2022-06-25 10:30:21.783 Info] 2022-06-25 10:30:21:783 -info- 127.0.0.1:52612 – has created connection. [2022-06-25 10:30:21.783 Info] 2022-06-25 10:30:21:783 -info- —– Start —– [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- Recv – 127.0.0.1 寬度: 1920 [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- —– Start —– [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- Recv – 127.0.0.1 高度: 1080 [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- —– Start —– [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- Recv – 127.0.0.1 結(jié)束: 0 [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- Send – 127.0.0.1 水平坐標: 550 [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- Send – 127.0.0.1 垂直坐標: 877 [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- Send – 127.0.0.1 結(jié)束: 0 [2022-06-25 10:30:31.797 Info] 2022-06-25 10:30:31:797 -info- —– Start —– [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- Recv – 127.0.0.1 寬度: 1920 [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- —– Start —– [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- Recv – 127.0.0.1 高度: 1080 [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- —– Start —– [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- Recv – 127.0.0.1 結(jié)束: 0 [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- Send – 127.0.0.1 水平坐標: 777 [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- Send – 127.0.0.1 垂直坐標: 950 [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- Send – 127.0.0.1 結(jié)束: 0 [2022-06-25 10:30:41.794 Info] 2022-06-25 10:30:41:794 -info- —– Start —– [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- Recv – 127.0.0.1 寬度: 1920 [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- —– Start —– [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- Recv – 127.0.0.1 高度: 1080 [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- —– Start —– [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- Recv – 127.0.0.1 結(jié)束: 0 [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- Send – 127.0.0.1 水平坐標: 271 [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- Send – 127.0.0.1 垂直坐標: 294 [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- Send – 127.0.0.1 結(jié)束: 0 [2022-06-25 10:30:51.792 Info] 2022-06-25 10:30:51:792 -info- —– Start —– [2022-06-25 10:30:53.792 Info] 2022-06-25 10:30:53:792 -error- ERROR: 127.0.0.1 – Connection Closed Gracefully. [2022-06-25 10:30:53.792 Info] 2022-06-25 10:30:53:792 -info- 127.0.0.1:52612 – has closed connection.

4.3 Tcp Socket Server 代碼框架

program 程序名;{$mode objfpc}{$H+}uses {$IFDEF UNIX} cthreads, {$ENDIF} Classes, SysUtils, CustApp, IdTCPServer, IdContext, IdGlobal, EventLog { you can add units after this };type { TTcpApplication } TTcpApplication = class(TCustomApplication) private TcpServer: TIdTCPServer; Logger: TEventLog; protected procedure DoRun; override; procedure OutputInfoLog(Info: String); procedure OutputErrorLog(Error: String); procedure ServeExecute(AContext: TIdContext); procedure ServeConnecte(AContext: TIdContext); procedure ServeDisconnect(AContext: TIdContext); procedure ServeException(AContext: TIdContext; AException: Exception); public constructor Create(TheOwner: TComponent); override; destructor Destroy; override; end;{ TTcpApplication }procedure TTcpApplication.OutputInfoLog(Info: String);var LogContent: String;begin LogContent:=FormatDateTime(‘yyyy-mm-dd hh:nn:ss:zzz’, Now) + ‘ -info- ‘ + Info; Writeln(LogContent); Logger.Info(LogContent);end;procedure TTcpApplication.OutputErrorLog(Error: String);var LogContent: String;begin LogContent:=FormatDateTime(‘yyyy-mm-dd hh:nn:ss:zzz’, Now) + ‘ -error- ‘ + Error; Writeln(LogContent); Logger.Info(LogContent);end;procedure TTcpApplication.ServeConnecte(AContext: TIdContext);var Info: String;begin // 連接 Info := AContext.Connection.Socket.Binding.PeerIP + ‘:’ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – has created connection.’; OutputInfoLog(Info);end;procedure TTcpApplication.ServeDisconnect(AContext: TIdContext);var Info: String;begin // 斷開連接 Info := AContext.Connection.Socket.Binding.PeerIP + ‘:’ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – has closed connection.’; OutputInfoLog(Info);end;procedure TTcpApplication.ServeException(AContext: TIdContext; AException: Exception);var Info: String;begin // 異常 Info := AContext.Connection.Socket.Binding.PeerIP + ‘ ‘ + inttostr(AContext.Connection.Socket.Binding.PeerPort) + ‘ – Error: ‘ + AException.Message; OutputErrorLog(Info);end;procedure TTcpApplication.ServeExecute(AContext: TIdContext);begin // 執(zhí)行 – 業(yè)務(wù)邏輯 end;procedure TTcpApplication.DoRun;begin { add your program here } Logger:=TEventLog.Create(Self); Logger.FileName:=’tcp_serve.log’; Logger.LogType:=ltFile; Logger.DefaultEventType:=etDebug; Logger.AppendContent:=True; Logger.Active:=True; TcpServer:=TIdTCPServer.Create(Self); TcpServer.DefaultPort:=8081; TcpServer.OnConnect:=@ServeConnecte; TcpServer.OnDisconnect:=@ServeDisconnect; TcpServer.OnExecute:=@ServeExecute; TcpServer.OnException:=@ServeException; TcpServer.StartListening; TcpServer.Active:=True; Writeln(‘Started at 8081’); Logger.Info(‘Started at 8081′); while True do readln(); // stop program loop Terminate;end;constructor TTcpApplication.Create(TheOwner: TComponent);begin inherited Create(TheOwner); StopOnException:=True;end;destructor TTcpApplication.Destroy;begin inherited Destroy;end;var Application: TTcpApplication;begin Application:=TTcpApplication.Create(nil); Application.Title:=’Tcp Application’; Application.Run; Application.Free;end.

將上面的代碼框架復(fù)制后適當(dāng)修改，實現(xiàn)業(yè)務(wù)邏輯即可。