{ Extented FileTransfer-Example by Joe Blocher (www.myticket.at)
  based on
  Remobjects: Filetransfer-Example, Threads-Example
  Eric Hill (TeamRO): Block-Transfer

  * Simultanous uploading files using threads (Multiselect in OpenDialog)
  * All other clients will start download automatically
}

unit ExtendedFileTransferClientMain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls,
  uROClient, uROClientIntf, uRORemoteService, uROBinMessage, uROWinInetHTTPChannel,
  Buttons, SyncObjs, ExtendedFileTransferLibrary_Intf,
  uROEventRepository;

type
  TExtendedFileTransferClientMainForm = class(TForm, IFileEvents)
    ROMessage: TROBinMessage;
    ROChannel: TROWinInetHTTPChannel;
    RORemoteService: TRORemoteService;
    UploadButton: TButton;
    EventReceiver: TROEventReceiver;
    Label4: TLabel;
    eFolder: TEdit;
    bSelectFolder: TButton;
    Memo: TMemo;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure UploadButtonClick(Sender: TObject);
    procedure bSelectFolderClick(Sender: TObject);
  private
    { Private declarations }
    fCritical: TCriticalSection;
    fFileService: IExtendedFileTransferService;
    procedure Log(Mes: string);
    procedure OnDownloadAborted(Sender: TObject);
    procedure OnDownloadError(Sender: TObject);
    procedure OnDownloadFinished(Sender: TObject);
    procedure OnDownloadProgress(Sender: TObject);
    procedure OnDownloadStarted(Sender: TObject);
    procedure OnUploadAborted(Sender: TObject);
    procedure OnUploadError(Sender: TObject);
    procedure OnUploadFinished(Sender: TObject);
    procedure OnUploadProgress(Sender: TObject);
    procedure OnUploadStarted(Sender: TObject);
    {IFileEvents}
    procedure OnNewFileAvailable(const filename: string; const filesize: Int64);
  public
    { Public declarations }
  end;

var
  ExtendedFileTransferClientMainForm: TExtendedFileTransferClientMainForm;

implementation
uses
  FileCtrl,
  ExtendedFileTransferClientUploadThread,
  ExtendedFileTransferClientDownloadThread;

{$R *.dfm}

procedure TExtendedFileTransferClientMainForm.FormCreate(Sender: TObject);
begin
  fCritical := TCriticalSection.create;
  eFolder.Text := ExtractFilePath(Paramstr(0)) + 'DownloadFiles\';
  ForceDirectories(eFolder.Text);
  fFileService := RORemoteService as IExtendedFileTransferService;
  EventReceiver.RegisterEventHandlers([EID_FileEvents], [Self]);
  EventReceiver.Active := True;
end;

procedure TExtendedFileTransferClientMainForm.FormDestroy(Sender: TObject);
begin
  try
    EventReceiver.Active := False;
    EventReceiver.UnregisterEventHandlers([EID_FileEvents]);
  finally
    fFileService := nil;
    fCritical.Free;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnDownloadAborted(Sender: TObject);
begin
  fCritical.Enter;
  with Sender as TDownloadThread do try
    // Do something
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnDownloadError(Sender: TObject);

begin
  fCritical.Enter;
  with Sender as TDownloadThread do try
    Log('Download ' + Filename + ': ' + Errortext);
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnDownloadStarted(Sender: TObject);
begin
  fCritical.Enter;
  with Sender as TDownloadThread do try
    Log(InfoStr + ': Download started');
    //Do something other: create new Progressbar (Max = FileSize .... )
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnDownloadProgress(Sender: TObject);
begin
  fCritical.Enter;
  try
    //Update Progressbar .... Use CurrentBytePos
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnDownloadFinished(Sender: TObject);
begin
  fCritical.Enter;
  with Sender as TDownloadThread do try
    if DownloadOK then begin
      Log(InfoStr + ': Download finished');
    end;
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnUploadAborted(Sender: TObject);
begin
  fCritical.Enter;
  with Sender as TUploadThread do try
    // Do something  -> Add Serviceoperation: Delete File ....
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnUploadError(Sender: TObject);

begin
  fCritical.Enter;
  with Sender as TUploadThread do try
    Log('Upload ' + Filename + ': ' + Errortext);
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnUploadStarted(Sender: TObject);
begin
  fCritical.Enter;
  with Sender as TUploadThread do try
    Log(InfoStr + ': Upload started');
    //Do something other: create Progressbar (Max = FileSize .... )
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnUploadProgress(Sender: TObject);
begin
  fCritical.Enter;
  try
    //Update Progressbar .... Use CurrentBytePos
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnUploadFinished(Sender: TObject);
begin
  fCritical.Enter;
  with Sender as TUploadThread do try
    if UploadOK then begin
      Log(InfoStr + ': Upload finished');
      fFileService.uploadfinished(Filename, FileSize);
    end;
  finally
    fCritical.Leave;
  end;
end;

procedure TExtendedFileTransferClientMainForm.UploadButtonClick(Sender: TObject);
var
  i: Integer;
begin
  with TOpendialog.Create(nil) do try
    InitialDir := 'c:\';
    Filename := '*.*';
    Filter := 'All Files (*.*)|*.*';
    Filterindex := 1;
    options := options + [ofAllowMultiSelect];
    if Execute then
      for i := 0 to Files.count - 1 do
        TUploadThread.Create(Files[i], OnUploadStarted, OnUploadProgress, OnUploadFinished, OnUploadAborted, OnUploadError);
  finally
    free;
  end;
end;

procedure TExtendedFileTransferClientMainForm.OnNewFileAvailable(const filename: string; const filesize:
  Int64);
begin
  TDownloadThread.Create(eFolder.Text, filename, filesize,
    OnDownloadStarted, OnDownloadProgress, OnDownloadFinished,
    OnDownloadAborted, OnDownloadError);
end;

procedure TExtendedFileTransferClientMainForm.bSelectFolderClick(
  Sender: TObject);
var
  ffolder: string;
begin
  ffolder := eFolder.Text;
  SelectDirectory(ffolder, [sdAllowCreate, sdPerformCreate, sdPrompt], 0);
  eFolder.Text := IncludeTrailingPathDelimiter(ffolder);
end;

procedure TExtendedFileTransferClientMainForm.Log(Mes: string);
begin
  Memo.Lines.Add(Mes);
end;

end.