delphi实现ftp上传下载文件到客户端

【实例截图】

【核心代码】

unit frmFtpUnit;

interface

uses
  Windows, Messages, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, ComCtrls,
  Menus,  SysUtils, Classes, IdIntercept, IdBaseComponent, IdComponent, IdTCPConnection,
  IdTCPClient, IdFTP, IdAntiFreezeBase, IdAntiFreeze, IdLogBase, IdLogDebug, IdGlobal,
  IdLogEvent, IdFTPCommon, IdFTPList, XPMenu;

type
  TfrmFtp = class(TForm)
    DirectoryListBox: TListBox;
    IdFTP1: TIdFTP;
    DebugListBox: TListBox;
    Panel1: TPanel;
    FtpServerEdit: TEdit;
    ConnectButton: TButton;
    Splitter1: TSplitter;
    Label1: TLabel;
    UploadOpenDialog1: TOpenDialog;
    Panel3: TPanel;
    SaveDialog1: TSaveDialog;
    StatusBar1: TStatusBar;
    TraceCheckBox: TCheckBox;
    CommandPanel: TPanel;
    UploadButton: TButton;
    AbortButton: TButton;
    BackButton: TButton;
    DeleteButton: TButton;
    DownloadButton: TButton;
    UserIDEdit: TEdit;
    PasswordEdit: TEdit;
    Label2: TLabel;
    Label3: TLabel;
    IdAntiFreeze1: TIdAntiFreeze;
    ProgressBar1: TProgressBar;
    UsePassive: TCheckBox;
    CurrentDirEdit: TEdit;
    ChDirButton: TButton;
    CreateDirButton: TButton;
    PopupMenu1: TPopupMenu;
    Download1: TMenuItem;
    Upload1: TMenuItem;
    Delete1: TMenuItem;
    N1: TMenuItem;
    Back1: TMenuItem;
    IdLogEvent1: TIdLogEvent;
    HeaderControl1: THeaderControl;
    XPMenu1: TXPMenu;
    procedure ConnectButtonClick(Sender: TObject);
    procedure UploadButtonClick(Sender: TObject);
    procedure DirectoryListBoxDblClick(Sender: TObject);
    procedure DeleteButtonClick(Sender: TObject);
    procedure IdFTP1Disconnected(Sender: TObject);
    procedure AbortButtonClick(Sender: TObject);
    procedure BackButtonClick(Sender: TObject);
    procedure IdFTP1Status(axSender: TObject; const axStatus: TIdStatus;
      const asStatusText: String);
    procedure TraceCheckBoxClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure DirectoryListBoxClick(Sender: TObject);
    procedure IdFTP1Work(Sender: TObject; AWorkMode: TWorkMode;
      const AWorkCount: Integer);
    procedure IdFTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
      const AWorkCountMax: Integer);
    procedure IdFTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
    procedure UsePassiveClick(Sender: TObject);
    procedure ChDirButtonClick(Sender: TObject);
    procedure CreateDirButtonClick(Sender: TObject);
    procedure IdLogEvent1Received(ASender: TComponent; const AText,
      AData: String);
    procedure IdLogEvent1Sent(ASender: TComponent; const AText,
      AData: String);
    procedure DebugListBoxDrawItem(Control: TWinControl; Index: Integer;
      Rect: TRect; State: TOwnerDrawState);
    procedure DirectoryListBoxDrawItem(Control: TWinControl;
      Index: Integer; Rect: TRect; State: TOwnerDrawState);
    procedure HeaderControl1SectionResize(HeaderControl: THeaderControl;
      Section: THeaderSection);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormClick(Sender: TObject);
  private
    { Private declarations }
    AbortTransfer: Boolean;
    TransferrignData: Boolean;
    BytesToTransfer: LongWord;
    STime: TDateTime;
    procedure ChageDir(DirName: String);
    procedure SetFunctionButtons(AValue: Boolean);
    procedure SaveFTPHostInfo(Datatext, header: String);
    function GetHostInfo(header: String): String;
    procedure PutToDebugLog(Operation, S1: String);
  public
    { Public declarations }
  end;

var
  frmFtp: TfrmFtp;

implementation

{$R *.dfm}

Uses
  IniFiles;

Var
  AverageSpeed: Double = 0;

procedure TfrmFtp.SetFunctionButtons(AValue: Boolean);
Var
  i: Integer;
begin
  with CommandPanel do
    for i := 0 to ControlCount - 1 do
      if Controls[i].Name <> 'AbortButton' then Controls[i].Enabled := AValue;

  with PopupMenu1 do
    for i := 0 to Items.Count - 1 do Items[i].Enabled := AValue;

  ChDirButton.Enabled := AValue;
  CreateDirButton.Enabled := AValue;
end;

procedure TfrmFtp.ConnectButtonClick(Sender: TObject);
begin
  ConnectButton.Enabled := false;
  if IdFTP1.Connected then try
    if TransferrignData then IdFTP1.Abort;
    IdFTP1.Quit;
  finally
    CurrentDirEdit.Text := '/';
    DirectoryListBox.Items.Clear;
    SetFunctionButtons(false);
    ConnectButton.Caption := '连接(&c)';
    ConnectButton.Enabled := true;
    ConnectButton.Default := true;
  end
  else with IdFTP1 do try
    Username := UserIDEdit.Text;
    Password := PasswordEdit.Text;
    Host := FtpServerEdit.Text;
    Connect;
    Self.ChageDir(CurrentDirEdit.Text);
     SetFunctionButtons(true);
    SaveFTPHostInfo(FtpServerEdit.Text, 'FTPHOST');
  finally
    ConnectButton.Enabled := true;
    if Connected then begin
      ConnectButton.Caption := '断开(&D)';
      ConnectButton.Default := false;
    end;
  end;
end;

procedure TfrmFtp.UploadButtonClick(Sender: TObject);
begin
  if IdFTP1.Connected then begin
    if UploadOpenDialog1.Execute then
    try
      SetFunctionButtons(false);
      try
      IdFTP1.TransferType := ftBinary;
      
      IdFTP1.Put(UploadOpenDialog1.FileName, ExtractFileName(UploadOpenDialog1.FileName));
      ChageDir(idftp1.RetrieveCurrentDir);
      except
        showmessage('上传错误');
      end;
    finally
      SetFunctionButtons(true);
    end;
  end;
end;

procedure TfrmFtp.ChageDir(DirName: String);
Var
  LS: TStringList;
begin
  LS := TStringList.Create;
  try
    SetFunctionButtons(false);
    IdFTP1.ChangeDir(DirName);
    IdFTP1.TransferType := ftASCII;

    CurrentDirEdit.Text := IdFTP1.RetrieveCurrentDir;

    DirectoryListBox.Items.Clear;
    IdFTP1.List(LS);
    DirectoryListBox.Items.Assign(LS);
    if DirectoryListBox.Items.Count > 0 then
      if AnsiPos('total', DirectoryListBox.Items[0]) > 0 then DirectoryListBox.Items.Delete(0);
  finally
    SetFunctionButtons(true);
    LS.Free;
  end;
end;

procedure TfrmFtp.DirectoryListBoxDblClick(Sender: TObject);
Var
  Name{, Line}: String;
begin
  if not IdFTP1.Connected then exit;
  //Line := DirectoryListBox.Items[DirectoryListBox.ItemIndex];
  Name := IdFTP1.DirectoryListing.Items[DirectoryListBox.ItemIndex].FileName;
  if IdFTP1.DirectoryListing.Items[DirectoryListBox.ItemIndex].ItemType = ditDirectory then begin
    // Change directory
    SetFunctionButtons(false);
    ChageDir(Name);
    SetFunctionButtons(true);
  end
  else begin
    try
      SaveDialog1.FileName := Name;
      if SaveDialog1.Execute then begin
        SetFunctionButtons(false);

        IdFTP1.TransferType := ftBinary;
        BytesToTransfer := IdFTP1.Size(Name);

        if FileExists(Name) then begin
//          case MessageDlg('File aready exists. Do you want to resume the download operation?',
          case MessageDlg('文件巳经存在. 你是否想更改文件件名进行下载操作?',
            mtConfirmation, mbYesNoCancel, 0) of
            mrYes: begin
              BytesToTransfer := BytesToTransfer - FileSizeByName(Name);
              IdFTP1.Get(Name, SaveDialog1.FileName, false, true);
            end;
            mrNo: begin
              IdFTP1.Get(Name, SaveDialog1.FileName, true);
            end;
            mrCancel: begin
              exit;
            end;
          end;
        end
        else begin
          IdFTP1.Get(Name, SaveDialog1.FileName, false);
        end;
      end;
    finally
      SetFunctionButtons(true);
    end;
  end;
end;

procedure TfrmFtp.DeleteButtonClick(Sender: TObject);
Var
  Name: String;
begin
  if not IdFTP1.Connected then exit;
  Name := IdFTP1.DirectoryListing.Items[DirectoryListBox.ItemIndex].FileName;
  if IdFTP1.DirectoryListing.Items[DirectoryListBox.ItemIndex].ItemType = ditDirectory then try
    SetFunctionButtons(false);
    idftp1.RemoveDir(Name);
    //  idftp1.c
    ChageDir(idftp1.RetrieveCurrentDir);
  finally
  end
  else
  try
    SetFunctionButtons(false);
    idftp1.Delete(Name);
    ChageDir(idftp1.RetrieveCurrentDir);
  finally
  end;
end;

procedure TfrmFtp.IdFTP1Disconnected(Sender: TObject);
begin
  StatusBar1.Panels[1].Text := '断开.';
end;

procedure TfrmFtp.AbortButtonClick(Sender: TObject);
begin
  AbortTransfer := true;
end;

procedure TfrmFtp.BackButtonClick(Sender: TObject);
begin
  if not IdFTP1.Connected then exit;
  try
    ChageDir('..');
  finally end;
end;

procedure TfrmFtp.IdFTP1Status(axSender: TObject; const axStatus: TIdStatus;
  const asStatusText: String);
begin
  DebugListBox.ItemIndex := DebugListBox.Items.Add(asStatusText);
  StatusBar1.Panels[1].Text := asStatusText;
end;

procedure TfrmFtp.TraceCheckBoxClick(Sender: TObject);
begin
  if TraceCheckBox.Checked then
    IdFtp1.Intercept := IdLogEvent1
  else
    IdFtp1.Intercept := nil;

  DebugListBox.Visible := TraceCheckBox.Checked;
  if DebugListBox.Visible then Splitter1.Top := DebugListBox.Top   5;
end;

procedure TfrmFtp.FormCreate(Sender: TObject);
begin
  SetFunctionButtons(false);

  IdFtp1.Intercept := IdLogEvent1;

  FtpServerEdit.Text := GetHostInfo('FTPHOST');

  ProgressBar1.Parent := StatusBar1;
  ProgressBar1.Top := 2;
  ProgressBar1.Left := 1;
  ProgressBar1.Align := alClient;
end;

procedure TfrmFtp.DirectoryListBoxClick(Sender: TObject);
begin
  if not IdFTP1.Connected then exit;
  if DirectoryListBox.ItemIndex > -1 then begin
  if IdFTP1.DirectoryListing.Items[DirectoryListBox.ItemIndex].ItemType = ditDirectory then DownloadButton.Caption := '变动目录'
    else DownloadButton.Caption := '下载(&n)';
  end;
end;

procedure TfrmFtp.IdFTP1Work(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCount: Integer);
Var
  S: String;
  TotalTime: TDateTime;
//  RemainingTime: TDateTime;
  H, M, Sec, MS: Word;
  DLTime: Double;
begin
  TotalTime :=  Now - STime;
  DecodeTime(TotalTime, H, M, Sec, MS);
  Sec := Sec   M * 60   H * 3600;
  DLTime := Sec   MS / 1000;
  if DLTime > 0 then
    AverageSpeed := {(AverageSpeed   }(AWorkCount / 1024) / DLTime{) / 2};

  if AverageSpeed > 0 then begin
    Sec := Trunc(((ProgressBar1.Max - AWorkCount) / 1024) / AverageSpeed);

    S := Format('%2d:%2d:%2d', [Sec div 3600, (Sec div 60) mod 60, Sec mod 60]);

    S := 'Time remaining '   S;
  end
  else S := '';

  S := FormatFloat('0.00 KB/s', AverageSpeed)   '; '   S;
  case AWorkMode of
    wmRead: StatusBar1.Panels[1].Text := '下载速度 '   S;
    wmWrite: StatusBar1.Panels[1].Text := '上载速度 '   S;
  end;

  if AbortTransfer then IdFTP1.Abort;

  ProgressBar1.Position := AWorkCount;
  AbortTransfer := false;
end;

procedure TfrmFtp.IdFTP1WorkBegin(Sender: TObject; AWorkMode: TWorkMode;
  const AWorkCountMax: Integer);
begin
  TransferrignData := true;
  AbortButton.Visible := true;
  AbortTransfer := false;
  STime := Now;
  if AWorkCountMax > 0 then ProgressBar1.Max := AWorkCountMax
  else ProgressBar1.Max := BytesToTransfer;
  AverageSpeed := 0;
end;

procedure TfrmFtp.IdFTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
begin
  AbortButton.Visible := false;
  StatusBar1.Panels[1].Text := '连接成功.';
  BytesToTransfer := 0;
  TransferrignData := false;
  ProgressBar1.Position := 0;
  AverageSpeed := 0;
end;

procedure TfrmFtp.UsePassiveClick(Sender: TObject);
begin
  IdFTP1.Passive := UsePassive.Checked;
end;

procedure TfrmFtp.ChDirButtonClick(Sender: TObject);
begin
  SetFunctionButtons(false);
  ChageDir(CurrentDirEdit.Text);
  SetFunctionButtons(true);
end;

procedure TfrmFtp.CreateDirButtonClick(Sender: TObject);
Var
  S: String;
begin
  S := InputBox('创建一个新目录', '目录名称', '');
  if S <> '' then
    try
      SetFunctionButtons(false);
      IdFTP1.MakeDir(S);
      ChageDir(CurrentDirEdit.Text);
    finally
      SetFunctionButtons(true);
    end;
end;

procedure TfrmFtp.SaveFTPHostInfo(Datatext, header: String);
var
  ServerIni: TIniFile;
begin
  ServerIni := TIniFile.Create(ExtractFilePath(ParamStr(0))   'FtpHost.ini');
  ServerIni.WriteString('Server', header, Datatext);
  ServerIni.UpdateFile;
  ServerIni.Free;
end;

function TfrmFtp.GetHostInfo(header: String): String;
var
  ServerName: String;
  ServerIni: TIniFile;
begin
  ServerIni := TIniFile.Create(ExtractFilePath(ParamStr(0))   'FtpHost.ini');
  ServerName := ServerIni.ReadString('Server', header, header);

  ServerIni.Free;
  result := ServerName;
end;

procedure TfrmFtp.PutToDebugLog(Operation, S1: String);
Var
  S: String;
begin
  while Length(S1) > 0 do begin
    if Pos(#13, S1) > 0 then begin
      S := Copy(S1, 1, Pos(#13, S1) - 1);
      Delete(S1, 1, Pos(#13, S1));
      if S1[1] = #10 then Delete(S1, 1, 1);
    end
    else
      S := S1;

    DebugListBox.ItemIndex := DebugListBox.Items.Add(Operation   S);
  end;
end;

procedure TfrmFtp.IdLogEvent1Received(ASender: TComponent; const AText,
  AData: String);
begin
  PutToDebugLog('<<- ', AData);
end;

procedure TfrmFtp.IdLogEvent1Sent(ASender: TComponent; const AText,
  AData: String);
begin
  PutToDebugLog('->> ', AData);
end;

{$IFDEF Linux}
procedure TfrmFtp.DebugListBoxDrawItem(Sender: TObject; Index: Integer;
  Rect: TRect; State: TOwnerDrawState; var Handled: Boolean);
{$ELSE}
procedure TFrmFtp.DebugListBoxDrawItem(Control: TWinControl;
  Index: Integer; Rect: TRect; State: TOwnerDrawState);
{$ENDIF}
begin
  if Pos('>>', DebugListBox.Items[index]) > 1 then
    DebugListBox.Canvas.Font.Color := clRed
  else
    DebugListBox.Canvas.Font.Color := clBlue;

  if odSelected in State then begin
    DebugListBox.Canvas.Brush.Color := $00895F0A;
    DebugListBox.Canvas.Font.Color := clWhite;
  end
  else
    DebugListBox.Canvas.Brush.Color := clWindow;

  DebugListBox.Canvas.FillRect(Rect);

  DebugListBox.Canvas.TextOut(Rect.Left, Rect.Top, DebugListBox.Items[index]);
end;

{$IFDEF Linux}
procedure TFrmFtp.DirectoryListBoxDrawItem(Sender: TObject; Index: Integer;
  Rect: TRect; State: TOwnerDrawState; var Handled: Boolean);
{$ELSE}
procedure TFrmFtp.DirectoryListBoxDrawItem(Control: TWinControl;
  Index: Integer; Rect: TRect; State: TOwnerDrawState);
{$ENDIF}
Var
  R: TRect;
begin
  if odSelected in State then begin
    DirectoryListBox.Canvas.Brush.Color := $00895F0A;
    DirectoryListBox.Canvas.Font.Color := clWhite;
  end
  else
    DirectoryListBox.Canvas.Brush.Color := clWindow;

  if Assigned(IdFTP1.DirectoryListing) and (IdFTP1.DirectoryListing.Count > Index) then begin
    DirectoryListBox.Canvas.FillRect(Rect);
    with IdFTP1.DirectoryListing.Items[Index] do begin
      DirectoryListBox.Canvas.TextOut(Rect.Left, Rect.Top, FileName);
      R := Rect;

      R.Left := Rect.Left   HeaderControl1.Sections.Items[0].Width;
      R.Right := R.Left   HeaderControl1.Sections.Items[1].Width;
      DirectoryListBox.Canvas.FillRect(R);
      DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, IntToStr(Size));

      R.Left := R.Right;
      R.Right := R.Left   HeaderControl1.Sections.Items[2].Width;
      DirectoryListBox.Canvas.FillRect(R);

      if ItemType = ditDirectory then begin
        DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, 'Directory');
      end
      else
        DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, 'File');

      R.Left := R.Right;
      R.Right := R.Left   HeaderControl1.Sections.Items[3].Width;
      DirectoryListBox.Canvas.FillRect(R);
      DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, FormatDateTime('mm/dd/yyyy hh:mm', ModifiedDate));

      R.Left := R.Right;
      R.Right := R.Left   HeaderControl1.Sections.Items[4].Width;
      DirectoryListBox.Canvas.FillRect(R);
      DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, GroupName);

      R.Left := R.Right;
      R.Right := R.Left   HeaderControl1.Sections.Items[5].Width;
      DirectoryListBox.Canvas.FillRect(R);
      DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, OwnerName);

      R.Left := R.Right;
      R.Right := R.Left   HeaderControl1.Sections.Items[6].Width;
      DirectoryListBox.Canvas.FillRect(R);
      DirectoryListBox.Canvas.TextOut(R.Left, Rect.Top, OwnerPermissions   GroupPermissions   UserPermissions);
    end;
  end;
end;

procedure TfrmFtp.FormClose(Sender: TObject; var Action: TCloseAction);
begin
     action:=cafree;
     self:=nil;
end;

procedure TfrmFtp.FormClick(Sender: TObject);
begin

end;

{$IFDEF Linux}
procedure TFrmFtp.HeaderControl1SectionResize(HeaderControl: TCustomHeaderControl;
     Section: TCustomHeaderSection);
{$ELSE}
procedure TFrmFtp.HeaderControl1SectionResize(
  HeaderControl: THeaderControl; Section: THeaderSection);
{$ENDIF}
begin
  DirectoryListBox.Repaint;
end;



end.