Discussion :

[colorid]

Bonjour,

Quelqu'un voit-il comment utiliser TTimer pour détecter l'introduction d'un nouveau fichier dans un répertoire ?

[WolffN]

bonjour

tu fais la liste des fichiers a l'instant T

sur l'evt timer tu refais une nouvelle liste et tu la compare par rapport a l'ancienne liste si modification tu fais ton traitement et tu met a jour ta liste

le timer sert juste a declencher la procedure de verification du contenu du repertoire a interval régulier

[ShaiLeTroll]

Pourquoi pas un Thread et FindFirstChangeNotification, c'est prévu pour !
Tient, c'est un peu brut, c'est un code que j'ai dans un de mes programmes ...

Code :

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type
  TFileSizeList = class(TStringList)
  private
    FCritical: TCriticalSection;
    function GetSize(const FileName: string): Integer;
    procedure SetSize(const FileName: string; const Value: Integer);
    function GetOldSize(const FileName: string): Integer;
    function GetSizes(const Index: Integer): TFileSizeListItem;
    function GetLastMessage(const Index: Integer): string;
    procedure SetLastMessage(const Index: Integer; const Value: string);
  public
    constructor Create();
    destructor Destroy(); override;
    procedure Clear(); override;
    function GetMessages(): string;
    property Size[const FileName: string]: Integer read GetSize write SetSize;
    property OldSize[const FileName: string]: Integer read GetOldSize;
    property Sizes[const Index: Integer]: TFileSizeListItem read GetSizes;
    property LastMessage[const Index: Integer]: string read GetLastMessage write SetLastMessage;
  end;
 
  TNotifyShaiFileChangeThread = class(TThread)
  private
     FDirName: string;
     FOnChange: TFileMessageEvent;
     FOnIdle: TFileMessageEvent;
     FFlash: Boolean;
     FFlashCritical: TCriticalSection;
     FFileSize: TFileSizeList;
     FExcludeFile: TStringList;
     procedure DoChange();
     procedure DoIdle();
     procedure ReadLastMessages();
  protected
     function GetFlash(): Boolean;
     procedure SetFlash(Value: Boolean);
  public
     constructor Create(const DirName: string; const AExcludeFile: TStrings; AOnChange, AOnIdle: TFileMessageEvent);
     destructor Destroy(); override;
     procedure Execute; override;
     class procedure ChangeFlash(Active: Boolean);
 
     property OnChange: TFileMessageEvent read FOnChange write FOnChange;
     property OnIdle: TFileMessageEvent read FOnIdle write FOnIdle;
     property Flash: Boolean read GetFlash write SetFlash;
  end;

Code :

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{ TNotifyShaiFileChangeThread}
 
constructor TNotifyShaiFileChangeThread.Create(const DirName: string; const AExcludeFile: TStrings; AOnChange, AOnIdle: TFileMessageEvent);
var
   I: Integer;
begin
   inherited Create(True);
 
   FFlashCritical := TCriticalSection.Create();
   FreeOnTerminate := True;
   FDirName := IncludeTrailingPathDelimiter(DirName);
   FOnChange := AOnChange;
   FOnIdle := AOnIdle;
   FFileSize := TFileSizeList.Create();
 
   FExcludeFile := TStringList.Create();
   FExcludeFile.Sorted := True;
   FExcludeFile.Duplicates := dupIgnore;
   FExcludeFile.CaseSensitive := False;
   if Assigned(AExcludeFile) then
      for I := 0 to AExcludeFile.Count - 1 do
        FExcludeFile.Add(AExcludeFile.Values[AExcludeFile.Names[I]]);
 
   Resume();
end;
 
destructor TNotifyShaiFileChangeThread.Destroy();
begin
   if Assigned(FExcludeFile) then
   begin
      FExcludeFile.Free();
      FExcludeFile := nil;
   end;
 
   if Assigned(FFileSize) then
   begin
      FFileSize.Free();
      FFileSize := nil;
   end;
 
   if Assigned(FFlashCritical) then
   begin
      FFlashCritical.Free();
      FFlashCritical := nil;
   end;
end;
 
function TNotifyShaiFileChangeThread.GetFlash(): Boolean;
begin
   FFlashCritical.Acquire();
   try
      Result := FFlash;
      FFlash := False;
   finally
      FFlashCritical.Release();
   end;
end;
 
procedure TNotifyShaiFileChangeThread.SetFlash(Value: Boolean);
begin
   FFlashCritical.Acquire();
   try
      FFlash := Value;
   finally
      FFlashCritical.Release();
   end;
end;
 
class procedure TNotifyShaiFileChangeThread.ChangeFlash(Active: Boolean);
begin
   _InternalThread.Flash := Active;
end;
 
procedure TNotifyShaiFileChangeThread.Execute();
var
   HandleNotification: THandle;
   Delay: Cardinal;
begin
   ReadLastMessages;
 
   Delay := 1000;
   Sleep(Delay);
 
   HandleNotification := FindFirstChangeNotification(PChar(FDirName), True, FILE_NOTIFY_CHANGE_SIZE);
   try
      while not Terminated do
      begin
         case WaitForSingleObject(HandleNotification, Delay) of
            WAIT_OBJECT_0 :
               begin
                 ReadLastMessages;
                 Synchronize(DoChange);
                 Delay := 1000;
                 FindNextChangeNotification(HandleNotification);
               end;
            WAIT_ABANDONED : Terminate;
            WAIT_TIMEOUT :
               begin
                  Synchronize(DoIdle);
                  Delay := 200;
               end;
         end;
      end;
   finally
      FindCloseChangeNotification(HandleNotification);
   end;
end;
 
procedure TNotifyShaiFileChangeThread.DoChange();
begin
   try
      if Assigned(FOnChange) then
      begin
        FOnChange(Self, FFileSize.GetMessages());
      end;
   except
      Exit;
   end;
end;
 
procedure TNotifyShaiFileChangeThread.DoIdle();
begin
   try
      if Assigned(FOnIdle) then
      begin
        FOnIdle(Self, FormatDateTime(' : dddd dd mmmm à hh:nn:ss', Now()));
      end;
   except
      Exit;
   end;
end;
 
{$WARN SYMBOL_PLATFORM OFF}
procedure TNotifyShaiFileChangeThread.ReadLastMessages();
 
  procedure FillSizes();
  var
    SearchRec: TSearchRec;
    SearcMask: string;
  begin
    FFileSize.BeginUpdate();
    try
      SearcMask := '*.log';
      if FindFirst(FDirName+SearcMask, faAnyFile, SearchRec)= 0 then
      begin
        repeat
          if FExcludeFile.IndexOf(SearchRec.Name) < 0 then
             FFileSize.Size[SearchRec.Name] := TWin32FindData(SearchRec.FindData).nFileSizeLow; // Peu probable que cela dépasse 2Go, je ne gère pas High
        until FindNext(SearchRec) <> 0;
      end;
    finally
      FFileSize.EndUpdate();
    end;
  end;
 
  function ReadLastMessage(const FileName: string; Index, Count: Integer): string;
  var
    F: File;
    OldFM: Byte;
    AmtTransferred: Integer;
  begin
    try
      AssignFile(F, FDirName+FileName);
      OldFM := FileMode;
      FileMode := 0;
      try
        Reset(F, 1);
        try
          Seek(F, Index);
          SetLength(Result, Count);
          BlockRead(F, Result[1], Count, AmtTransferred);
          SetLength(Result, AmtTransferred);
        finally
          CloseFile(F);
        end;
      finally
        FileMode := OldFM;
      end;
    except
      on E: Exception do Result := E.Message;
    end;
  end;
 
  procedure CheckSizes();
  var
    ifs: Integer;
    Item: TFileSizeListItem;
  begin
    for ifs := 0 to FFileSize.Count - 1 do
    begin
      Item := FFileSize.Sizes[ifs];
      if Item.Size > Item.OldSize then
        FFileSize.LastMessage[ifs] := ReadLastMessage(FFileSize[ifs], Item.OldSize, Item.Size-Item.OldSize-1);
    end;
  end;
 
begin
  try
    FillSizes();
    CheckSizes();
  except
    on E: Exception do Exit;
  end;
end;
 
{ TFileSizeList }
 
constructor TFileSizeList.Create();
begin
  inherited Create();
 
  FCritical := TCriticalSection.Create();
  Sorted := True;
  Duplicates := dupIgnore;
end;
 
 
destructor TFileSizeList.Destroy();
begin
  inherited Destroy();
 
  if Assigned(FCritical) then
  begin
    FCritical.Free();
    FCritical := nil;
  end;
end;
 
procedure TFileSizeList.Clear();
var
  Index: Integer;
begin
  FCritical.Acquire();
  try
    for Index := 0 to Count - 1 do
      if Assigned(Objects[Index]) then
        Dispose(PFileSizeListItem(Objects[Index]));
    inherited Clear();
  finally
    FCritical.Release();
  end;
end;
 
function TFileSizeList.GetSize(const FileName: string): Integer;
var
  Index: Integer;
begin
  Index := IndexOf(FileName);
  if Index >= 0 then
    Result := PFileSizeListItem(Objects[Index])^.Size
  else
    Result := -1;
end;
 
procedure TFileSizeList.SetSize(const FileName: string; const Value: Integer);
var
  Index: Integer;
  Item: PFileSizeListItem;
begin
  FCritical.Acquire();
  try
    Index := IndexOf(FileName);
    if Index >= 0 then
    begin
      PFileSizeListItem(Objects[Index])^.OldSize := PFileSizeListItem(Objects[Index])^.Size;
      PFileSizeListItem(Objects[Index])^.Size := Value;
      PFileSizeListItem(Objects[Index])^.LastMessage := '';
    end else
    begin
      New(Item);
      Item^.OldSize := Value;
      Item^.Size := Value;
      Item^.LastMessage := '';
      AddObject(FileName, Pointer(Item));
    end;
  finally
    FCritical.Release();
  end;
end;
 
function TFileSizeList.GetOldSize(const FileName: string): Integer;
var
  Index: Integer;
begin
  Index := IndexOf(FileName);
  if Index >= 0 then
    Result := PFileSizeListItem(Objects[Index])^.OldSize
  else
    Result := -1;
end;
 
function TFileSizeList.GetSizes(const Index: Integer): TFileSizeListItem;
begin
  Result := PFileSizeListItem(Objects[Index])^;
end;
 
function TFileSizeList.GetLastMessage(const Index: Integer): string;
begin
  FCritical.Acquire();
  try
    if Index < Count then
      Result := PFileSizeListItem(Objects[Index])^.LastMessage
    else
      Result := '';
  finally
    FCritical.Release();
  end;
end;
 
procedure TFileSizeList.SetLastMessage(const Index: Integer; const Value: string);
begin
  FCritical.Acquire();
  try
    if Index < Count then
      PFileSizeListItem(Objects[Index])^.LastMessage := Value;
  finally
    FCritical.Release();
  end;
end;
 
function TFileSizeList.GetMessages: string;
var
  Index: Integer;
  Msg: WideString;
begin
  Result := '';
  for Index := 0 to Count - 1 do
  begin
    Msg := LastMessage[Index];
    if Length(Msg) > 0 then
    begin
      Msg := StringReplace(Msg, ' <', ' ', [rfReplaceAll]);
      Msg := StringReplace(Msg, '>'#9, ' : <B>', [rfReplaceAll]);
      Msg := StringReplace(Msg, #13, '</B><BR>', [rfReplaceAll]);
      Result := Result + '<BR>' + Msg;
    end;
  end;
  Result := StringReplace(Utf8ToAnsi(Result), #13, ' ', [rfReplaceAll]);
end;

[colorid]

Bonjour,

Effectivement la solution se trouvait être dans l'utilisation d'un thread et ça marche !

Merci à tous