Pointeur thread string

**KNETUS** · 31/08/2007, 07h40

bonjour

je n'arrive pas a faire passer une string comme parametre(pointer) a un tjvthread
cela m'affiche la bonne string une fois sur deux !!

la commande qui lance le string:

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url := 'blablabla';
ThreadGetPageTitre.Execute(Pchar(url ));

le thread:

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procedure TForm1.ThreadExecute(Sender: TObject;Params: Pointer);
var
 
pt:pchar;
begin
    pt:= Params;
    showmessage( pt^);
end;

si quelqu'un a une solution !!
merci

end;

**ShaiLeTroll** · 31/08/2007, 18h37

je ne connais pas le tjvthread

mais normalement, Execute() est une méthode que l'on doit surcharger sans changer les paramètres

tient ce code devrait t'interesser, c'est pour un TThread standard mais cela m'étonnerait que le tjvthread soit si différent

C'est un peu compliqué, mais cela peut te donner une idée de ce que l'on peut faire avec un simple objet TThread ...

Intéresse toi à "DirName"

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  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;
 
  TNotifyLogFileChangeThread = 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;
 
  { TNotifyLogFileChangeThread}
 
constructor TNotifyLogFileChangeThread.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 TNotifyLogFileChangeThread.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 TNotifyLogFileChangeThread.GetFlash(): Boolean;
begin
   FFlashCritical.Acquire();
   try
      Result := FFlash;
      FFlash := False;
   finally
      FFlashCritical.Release();
   end;
end;
 
procedure TNotifyLogFileChangeThread.SetFlash(Value: Boolean);
begin
   FFlashCritical.Acquire();
   try
      FFlash := Value;
   finally
      FFlashCritical.Release();
   end;
end;
 
class procedure TNotifyLogFileChangeThread.ChangeFlash(Active: Boolean);
begin
   _InternalThread.Flash := Active;
end;
 
function ShellProc(code: Integer; wparam: WPARAM; lparam: LPARAM): LRESULT stdcall; // TFNHookProc
begin
  TNotifyLogFileChangeThread.ChangeFlash(code = HSHELL_REDRAW);
  Result := Ord(True);
end;
 
procedure TNotifyLogFileChangeThread.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 TNotifyLogFileChangeThread.DoChange();
begin
   try
      if Assigned(FOnChange) then
      begin
        FOnChange(Self, FFileSize.GetMessages());
      end;
   except
      Exit;
   end;
end;
 
procedure TNotifyLogFileChangeThread.DoIdle();
begin
   try
      if Assigned(FOnIdle) then
      begin
        FOnIdle(Self, FormatDateTime(' : dddd dd mmmm à hh:nn:ss', Now()));
      end;
   except
      Exit;
   end;
end;
 
procedure TNotifyLogFileChangeThread.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;

Pointeur thread string

Langage Delphi

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