unit1.pas

Delphi使用Indy实现FTP操作例子（代码实现）

{********************************************
  FTP上传下载Demo

  说明：功能还没有完全完成，只是简单的上传与下
        载，在上传时断点续传还有些问题。仅供参考

  作者：5207 于2008-12-17

  http://www.mini188.com/     点滴论坛 
********************************************}
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, msxmldom, 
  IdBaseComponent,
  IdComponent, IdFTP, IdTCPConnection, IdTCPClient, 
  ComCtrls, ImgList, IdFTPCommon, ExtCtrls, IdIOHandler,
  IdIOHandlerSocket, IdAntiFreezeBase, IdAntiFreeze, IdIntercept;

type
  TForm1 = class(TForm)
    Button2: TButton;
    IdFTP1: TIdFTP;
    Label1: TLabel;
    Button4: TButton;
    Button5: TButton;
    SaveDialog1: TSaveDialog;
    ListView1: TListView;
    ImageList1: TImageList;
    Label2: TLabel;
    Label3: TLabel;
    edtUserName: TEdit;
    Label4: TLabel;
    edtPwd: TEdit;
    edtHost: TEdit;
    btnPost: TButton;
    OpenDialog1: TOpenDialog;
    Button6: TButton;
    Memo2: TMemo;
    Button7: TButton;
    Button3: TButton;
    Button8: TButton;
    pb1: TProgressBar;
    Button9: TButton;
    Button10: TButton;
    IdConnectionIntercept1: TIdConnectionIntercept;
    IdAntiFreeze1: TIdAntiFreeze;
    IdIOHandlerSocket1: TIdIOHandlerSocket;
    procedure Button2Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure ListView1DblClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure btnPostClick(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure IdFTP1Work(Sender: TObject; AWorkMode: TWorkMode;
      const AWorkCount: Integer);
    procedure IdFTP1AfterClientLogin(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure IdFTP1Connected(Sender: TObject);
    procedure IdFTP1Status(ASender: TObject; const AStatus: TIdStatus;
      const AStatusText: String);
    procedure Button7Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure IdFTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
      const AWorkCountMax: Integer);
    procedure IdFTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
    procedure Button8Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
    procedure Button10Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    FSrcFile: string;
    FStopFtp: Boolean;
    FAbortFtp: Boolean;
    FPutFile: string;
    FFtpDirList: TStringList;

    procedure ChageDir(DirName: String);
    function GetNameFromDirLine(Line: String;
      var IsDirectory: Boolean): String;
    procedure Log(const AMsg: string);
    procedure PutFile(const AFileName: string);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button2Click(Sender: TObject);
begin
  IdFTP1.Host := edtHost.Text;
  IdFTP1.Username := edtUserName.Text;
  IdFTP1.Password := edtPwd.Text;

  IdFTP1.Disconnect;
  IdFTP1.Connect;
  if IdFTP1.Connected then
  begin
    Label1.Caption := '连接成功';
    ChageDir('\');
  end
  else
    Label1.Caption := '连接失败';
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
 ChageDir('\');
end;

procedure TForm1.Button5Click(Sender: TObject);
var
  stream: TFileStream;
  sDownToFileName: string;
  bIsDir: Boolean;
  sDir: string;
begin
  if ListView1.Selected = nil then Exit;
  if not IdFTP1.Connected then
    raise Exception.Create('未连接FTP服务器');

  if SaveDialog1.Execute then
  begin
    sDownToFileName := SaveDialog1.FileName;
    if FileExists(sDownToFileName) then
      stream := TFileStream.Create(sDownToFileName, fmOpenWrite)
    else
      stream := TFileStream.Create(sDownToFileName, fmCreate);
    try
      if ListView1.Items.Count > 0 then
      begin
        sDir := GetNameFromDirLine(FFtpDirList.Strings[ListView1.ItemIndex], bIsDir);
        if not bIsDir then
        begin
          pb1.Max := IdFTP1.Size(sDir);
          pb1.Position := stream.Size;
          stream.Position := stream.Size;
          IdFTP1.Get(sDir, stream, True);
          ChageDir(IdFTP1.RetrieveCurrentDir);
        end;
      end;
    finally
      FreeAndNil(stream);
    end;
  end;
end;

procedure TForm1.ChageDir(DirName: String);
var
  i: Integer;
  bIsDir: Boolean;
  sPathName: string;
  lvItem: TListItem;
begin
  ListView1.Items.Clear;
  FFtpDirList.Clear;

  if not IdFTP1.Connected then Exit;
  ListView1.Items.BeginUpdate;
  try
    IdFTP1.ChangeDir(DirName);
    IdFTP1.TransferType := ftASCII;
    IdFTP1.List(FFtpDirList);

    bIsDir := False;
    for i := 0 to FFtpDirList.Count -1 do
    begin
      lvItem := ListView1.Items.Add;
      lvItem.Caption := GetNameFromDirLine(FFtpDirList.Strings[i], bIsDir);
    end;
  finally
    ListView1.Items.EndUpdate;
  end;
end;

procedure TForm1.ListView1DblClick(Sender: TObject);
var
  bIsDir: Boolean;
  sDir: string;
begin
  if ListView1.Selected = nil then Exit;

  if ListView1.Items.Count > 0 then
  begin
    sDir := GetNameFromDirLine(FFtpDirList.Strings[ListView1.ItemIndex], bIsDir);
    if bIsDir then
      ChageDir(sDir);
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  ws: DWORD;
begin
  FFtpDirList := TStringList.Create;
  FAbortFtp := False;
  FStopFtp := False;
end;

procedure TForm1.PutFile(const AFileName: string);
var
  mm: TFileStream;
  iFileSize: Int64;
begin
  mm := TFileStream.Create(AFileName, fmOpenRead);
  try
    try
      pb1.Max := mm.Size;
      iFileSize := IdFTP1.Size(ExtractFileName(AFileName));
      if iFileSize <> -1 then
      begin
        pb1.Position := iFileSize;
        mm.Position := iFileSize;
  //      mm.Seek(iFileSize, soFromBeginning);
        IdFTP1.Quote('REST ' + FloatToStr(iFileSize));
        IdFTP1.Put(mm, ExtractFileName(AFileName), True);
      end
      else
        IdFTP1.Put(mm, ExtractFileName(AFileName));

      ChageDir(IdFTP1.RetrieveCurrentDir);
    except

    end;

  finally
    FreeAndNil(mm);
  end;
end;

procedure TForm1.btnPostClick(Sender: TObject);
begin
  if OpenDialog1.Execute then
  begin
    FPutFile := OpenDialog1.FileName;
    PutFile(FPutFile);
  end;
end;

//获取文件或目录名 
function TForm1.GetNameFromDirLine(Line: string; var IsDirectory: Boolean): string;
var 
  i: Integer;
  DosListing: Boolean;
begin
  IsDirectory := Line[1] = 'd';
  DosListing := false;
  for i := 0 to 7 do begin
    if (i = 2) and not IsDirectory then
    begin
      //IsDirectory := Copy(Line, 1, Pos(' ', Line) - 1) = '&lt;DIR&gt;';
      IsDirectory := Copy(Line, 1, Pos(' ', Line) - 1) = '<DIR>';
      if not IsDirectory then
        DosListing := Line[1] in ['0'..'9']
      else
        DosListing := true;
    end;
    Delete(Line, 1, Pos(' ', Line));
    While Line[1] = ' ' do Delete(Line, 1, 1);
    if DosListing and (i = 2) then break;
  end;
  Result := Line;
end; 

procedure TForm1.Button6Click(Sender: TObject);
var
  iRtn: Integer;
begin
  if IdFTP1.Connected then
  begin
    iRtn := IdFTP1.SendCmd('REST 1');
    if iRtn = 350 then
      ShowMessage('支持断点续传')
    else
      ShowMessage('不支持断点续传');
  end;
end;

procedure TForm1.IdFTP1Work(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCount: Integer);
begin
  pb1.Position := AWorkCount;
  try
    if FStopFtp then
    begin
      //IdFTP1.CheckForGracefulDisconnect(False);
      IdFTP1.Abort;
//      IdFTP1.Disconnect;
    end;
  except
    Log('操作被中止');
  end;
  Application.ProcessMessages;
end;

procedure TForm1.IdFTP1AfterClientLogin(Sender: TObject);
begin
  Log(IdFTP1.LoginMsg.Text.Text);
end;

procedure TForm1.Log(const AMsg: string);
begin
  Memo2.Lines.Add(AMsg);
end;

procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  IdFTP1.Disconnect;
  CanClose := True;
end;

procedure TForm1.IdFTP1Connected(Sender: TObject);
begin
  Log('Ftp Is Connected');
end;

procedure TForm1.IdFTP1Status(ASender: TObject; const AStatus: TIdStatus;
  const AStatusText: String);
begin
  Log(AStatusText);
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
  IdFTP1.Quit;
  ChageDir('\');
  Label1.Caption := '关闭了连接';
//  IdFTP1.Disconnect;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  FStopFtp := not FStopFtp;

  if FStopFtp then
  begin
    Button3.Caption := '继续';
    FStopFtp := True;
  end
  else
  begin
    Button3.Caption := '中止';
    FStopFtp := False;
  end;
//    PutFile(FPutFile);
end;

procedure TForm1.IdFTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCountMax: Integer);
begin
  FAbortFtp := False;
  FStopFtp := False;
end;

procedure TForm1.IdFTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
begin
  FAbortFtp := False;
//  if AWorkMode in [wmRead, wmWrite] then
//    pb1.Position := pb1.Max;
end;

procedure TForm1.Button8Click(Sender: TObject);
var
  bIsDir: Boolean;
  sDir: string;
begin
  if ListView1.Selected = nil then Exit;

  if ListView1.Items.Count > 0 then
  begin
    sDir := GetNameFromDirLine(FFtpDirList.Strings[ListView1.ItemIndex], bIsDir);
    if not bIsDir then
    begin
      IdFTP1.Delete(sDir);
      ChageDir(IdFTP1.RetrieveCurrentDir);
    end;
  end;
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
  FAbortFtp := true;
end;

procedure TForm1.Button10Click(Sender: TObject);
begin
  ChageDir(IdFTP1.RetrieveCurrentDir);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  if Assigned(FFtpDirList) then FreeAndNil(FFtpDirList);
end;

end.