Comment utiliser TTimer pour détecter un événement dans un répertoire ?

**colorid** · 29/10/2007, 16h53

Bonjour,

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

**WolffN** · 29/10/2007, 17h53

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** · 30/10/2007, 11h58

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 :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
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 :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
{ 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** · 30/10/2007, 13h56

Bonjour,

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

Merci à tous

Comment utiliser TTimer pour détecter un événement dans un répertoire ?

Composants VCL Delphi

Discussions similaires

Partager

Partager