本文以實例形式講述了Delphi下木馬的檔案傳輸方法的實作過程，具體步驟如下：
伺服器端代碼:
unit ServerFrm;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ComCtrls, StdCtrls, ExtCtrls,WinSock;type TfrmMain = class(TForm) Panel1: TPanel; : TPanel; stabar: TStatusBar; SaveDialog: TSaveDialog; btnListen: TButton; btnReceive: TButton; btnStop: TButton; btnExit: TButton; procedure FormCreate(Sender: TObject); procedure btnExitClick(Senderure); ; procedure btnListenClick(Sender: TObject); procedure btnReceiveClick(Sender: TObject); procedure btnStopClick(Sender: TObject); private { Private declarations } public { Public declarations } StopTrans:Boolean >Translean;表示正在接收文件Server:TSocket; //定義伺服器端的socket句柄//自訂程序接收檔案procedure RecvFile(FileName:String); end;var frmMain: TfrmMain;const BlockLen=1024*4;implementation{$R *.dfm}procedure tfrmmain.RecvFile(FileName :String);var Ftrans:file of Byte; Recelen:Integer; Blockbuf:array[0..BlockLen-1] of Byte; RecvSocket:TSocket; ra:Sockaddr_in; ra_len:integer;begin ra_len:=sizeof(ra); Recvsocket:=accept(server,@ra,@ra_len); assignFile (Ftrans,filename); rewrite(ftrans); stoptrans:=false; intrans:=true; recelen:=recv(recvsocket,Blockbuf,BlockLen,0); while (recelen>0) and (not StopTrans) do begin BlockWrite(Ftrans,Blockbuf[0],BlockLen); application.ProcessMessages; recelen:=recv(recvsocket. Blockbuf,Blocklen,0); if stoptrans then begin CloseFile(Ftrans); CloseSocket(RecvSocket); InTrans:=False; MessageBox(Handle,'停止傳輸!','提示',MB_OK); EXIT; END; END; //關閉檔案,接收的SOCKET CloseFile(Ftrans) ; Closesocket(recvsocket); InTrans:=False; if (Recelen=SOCKET_ERROR) then messagebox(handle,'傳輸異常終止!','提示',MB_OK) ELSE MESSAGEBOX(HANDLE,'客戶端已經關閉連接1,檔案可能已經傳送完畢了!','提示',MB_OK);end; procedure TfrmMain .FormCreate(Sender: TObject);var aWSAData:TWSAData;begin if WSAStartup($0101,aWSAData)<>0 then raise Exception.Create('不能啟動WinSock動態連結庫'); messageBox(Handle,aWSAdata.szDescription ,'WinSock動態連結庫版本',mb_ok);end;procededure TfrmMain.b (Sender: TObject);begin Close;end;procedure TfrmMain.FormClose(Sender: TObject; var Action: TCloseAction);begin if InTrans then if MessageBox(handle,'正在接收檔案,停止嗎？ ','提示',MB_YESNO)=IDNO then abort; IF SERVER<>INVALID_SOCKET THEN CLOSESOCKET(SERVER); //釋放winsock動態連結庫所建立的資源if WSACleanup<>0 then messagebox(handle,'清除Winsock庫錯誤！ ','提示',MB_OK) ELSE messagebox(handle,'清除Winsock動態連結庫成功！','提示',MB_OK);end;procedure TfrmMain.btnListenClick(Sender: TObject);var ca:SOCKADDR_IN;begin //建立伺服器端SOCKET Server:=Socket( PF_INET,SOCK_STREAM,IPPROTO_IP); IF server=invalid_socket then begin stabar.SimpleText :='建立接收SOCKET錯誤1'; exit; end; //綁定伺服器端SOCKET ca.sin_family :=PF_INET; CA.sin_port :=htons(strtoint(trim(edtPort.Text ))); caport :=htons(strtoint(trim(edtPort.Text ))); caport :=htons(strtoint(trim(edtPort.Text) .sin_addr.S_addr :=INADDR_ANY; if bind(server,ca,sizeof(ca))=socket_error then begin stabar.SimpleText :='綁定socket錯誤,請更改接收連接埠'; closeSocket(server); exit; end else stabar.SimpleText :='綁定接收端socket成功!'; //開始監聽listen(server,5); btnlisten.Enabled :=False; btnstop.Enabled :=true;end;procedure TfrmMain.btnReceiveClick(Sender: TObject);begin if (server=INVALID_SOCKET) THEN BEGIN MESSAGEBOX(HANDLE,'還沒有進行監聽,請先進行監聽!','提示',MB_OK ); EXIT; END; IF SaveDialog.Execute THEN RECVFILE(SaveDialog.FileName ); end;procedure TfrmMain.btnStopClick(Sender: TObject);begin STOPTRANS:=TRUE; IF SERVER<>INVALID_SOCKET THEN cLOSESOCKET(SERVER)； :=fALSE; BTNlISTEN.Enabled :=TRUE;end;end.客戶端代碼:
unit ClientFrm;interfaceuse ; edtPort: TEdit; StatusBar: TStatusBar; btnConnect: TButton; btnSend: TButton; btnStop: TButton; btnExit: TButton; ProgressBar: TProgressBar; procedure FormCreate(Sender: TObject)； Action: TCloseAction); procedure btnConnectClick(Sender: TObject); procedure btnSendClick(Sender: TObject); procedure btnStopClick(Sender: TObject); private { Private declarations } Client:TSocket; public { Public Transcations } 是否停止的開發InTrans:Boolean; //表示是否正在傳送檔案procedure TransFile(FileName:String); //傳遞檔案的過程end; const BlockLen=1024*4; //每次傳送的最大資料量var frmMain: TfrmMain;implementation{$R *. dfm}procedure TfrmMain.TransFile(FileName:String); //傳遞檔案的過程var Ftrans:file of Byte; Flen:integer; BlockNum,RemainLen:integer; BlockBuf:array[0..BlockLen-1] of Byte; i:integer; SendLen:Integer;begin assignFile(Ftrans,filename); reset(Ftrans); Flen:=FileSize(Ftrans); BlockNum :=Flen div BlockLen; progressBar.Max :=1+BlockNum; RemainLen:=Flen mod BlockLen; StopTrans:=False; InTrans:=True; SendLen:=1; for i:=0 to BlockNum-1 do begin if (StopTrans) or (SendLen<=0) then Break; BlockRead(Ftrans,Blockbuf[0] ,BlockLen); SendLen:=Send(Client,Blockbuf,BlockLen,0); ProgressBar.Position :=i; Application.processMessages; end; if StopTrans then begin CloseFile(Ftrans); InTrans:=False; StatusBar.SimpleText :=''; MessageBox(Handle,'停止傳輸!','提示',mb_okText :=''; MessageBox(Handle,'停止傳輸!','提示',mb_okText_ok ); progressbar.Position :=0; exit; end; if (SendLen<=0) then begin CloseFile(Ftrans); InTrans:=False; StatusBar.SimpleText :=''; messagebox(handle,'傳出異常終止!','提示',MB_OK); progressBar.Position :=0; exit; end; if remainLen>0 then begin BlockRead(Ftrans,BlockBuf[0],RemainLen); SendLen:=send(client,BlockBuf,Remainlen,0); if (sendLen<=0) then begin closeFile(Ftrans); InTrans:=False; StatusBar.SimpleText :=''; messagebox(handle,'異常傳輸終止! ','提示',mb_ok); progressBar.Position :=0; exit; end; end; progressBar.Position :=ProgressBar.Max ; CloseFile(Ftrans); InTrans:=False; StatusBar.SimpleText :=''; messagebox(handle,'傳輸完成!','提示',mb_ok); progressbar.Position :=0 ;end;procedure TfrmMain.FormCreate(Sender: TObject);var aWSAData:TWSAData;begin if WSAStartup($0101,aWSAData)<>0 then raise Exception.Create('不能啟動WinSock動態連結庫'); messageBox(Handle,aWSAdata.szDescription ,'WinSock動態連結庫版本',mb_ok);end;procedure TfrmMain. btnExitClick(Sender: TObject);begin Close;end;procedure TfrmMain.FormClose(Sender: TObject; var Action: TCloseAction);begin if InTrans then if MessageBox(handle,'正在傳輸檔案,停止嗎？ ','提示',MB_YESNO)=IDNO then abort; //釋放winsock動態連結庫所建立的資源if WSACleanup<>0 then messagebox(handle,'清除Winsock動態連結庫錯誤！','提示',MB_OK) ELSE messagebox(handle,'清除Winsock動態連結庫成功！','提示',MB_OK); CloseSocket(Client);end;procedure TfrmMain.btnConnectClick(Sender: TObject);var ca:SOCKADDR_IN; hostaddr:u_long;begin Client:=Socket(PF_INET,SOCK_STREAM,IPPROTO_IPFer IFKPENTIP); :='為連線遠端伺服器端建立COSKET錯誤!'; exit; end; ca.sin_family :=PF_INET; CA.sin_port :=HTONS(STRTOINT(TRIM(EDTpORT.Text ))); HOSTADDR:=INET_ADDR(PCHAR( TRIM(EDTIP.Text ))); //判斷IP是否合法if (hostaddr= -1) then begin StatusBar.SimpleText :='主機IP位址：'+trim(edtip.Text )+'錯誤'; exit; end else ca.sin_addr.S_addr :=hostaddr; //連接伺服器if connect(Client,ca,sizeof( ca))<>0 then begin StatusBar.SimpleText :='連接伺服器端SOCKET錯誤!'; exit; end else StatusBar.SimpleText :='連接遠端SOCKET成功!';end;procedure TfrmMain.btnSendClick(Sender: TObject);begin if (opendfile.Execute ) and (FileExists(opendfile.FileName )) then transFile(opend.FileName Name); end;procedure TfrmMain.btnStopClick(Sender: TObject);begin Stoptrans:=True;end;end.