1 | unit UDebugLog;
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2 |
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3 | {$mode delphi}
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4 |
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5 | interface
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6 |
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7 | uses
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8 | Classes, SysUtils, FileUtil, SpecializedList, SyncObjs;
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9 |
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10 | type
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11 | TDebugLogAddEvent = procedure (Group: string; Text: string) of object;
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12 |
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13 | TDebugLogItem = class
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14 | Time: TDateTime;
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15 | Group: string;
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16 | Text: string;
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17 | end;
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18 |
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19 | TNewItemEvent = procedure (NewItem: TDebugLogItem) of object;
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20 |
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21 | { TDebugLog }
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22 |
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23 | TDebugLog = class(TComponent)
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24 | private
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25 | FFileName: string;
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26 | FMaxCount: Integer;
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27 | FOnNewItem: TNewItemEvent;
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28 | FWriteToFileEnable: Boolean;
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29 | procedure SetMaxCount(const AValue: Integer);
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30 | public
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31 | Items: TListObject;
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32 | Lock: TCriticalSection;
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33 | procedure Add(Text: string; Group: string = '');
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34 | procedure WriteToFile(Text: string);
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35 | constructor Create(AOwner: TComponent); override;
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36 | destructor Destroy; override;
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37 | published
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38 | property WriteToFileEnable: Boolean read FWriteToFileEnable
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39 | write FWriteToFileEnable;
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40 | property FileName: string read FFileName write FFileName;
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41 | property MaxCount: Integer read FMaxCount write SetMaxCount;
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42 | property OnNewItem: TNewItemEvent read FOnNewItem write FOnNewItem;
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43 | end;
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44 |
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45 | procedure Register;
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46 |
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47 | implementation
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48 |
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49 | resourcestring
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50 | SFileNameNotDefined = 'Filename not defined';
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51 |
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52 | procedure Register;
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53 | begin
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54 | RegisterComponents('Common', [TDebugLog]);
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55 | end;
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56 |
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57 | { TDebugLog }
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58 |
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59 | procedure TDebugLog.SetMaxCount(const AValue: Integer);
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60 | begin
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61 | if FMaxCount = AValue then Exit;
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62 | FMaxCount := AValue;
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63 | try
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64 | Lock.Acquire;
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65 | if Items.Count > FMaxCount then Items.Count := AValue;
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66 | finally
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67 | Lock.Release;
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68 | end;
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69 | end;
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70 |
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71 | procedure TDebugLog.Add(Text: string; Group: string = '');
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72 | var
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73 | NewItem: TDebugLogItem;
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74 | begin
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75 | NewItem := TDebugLogItem.Create;
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76 | NewItem.Time := Now;
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77 | NewItem.Group := Group;
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78 | NewItem.Text := Text;
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79 |
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80 | try
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81 | Lock.Acquire;
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82 | Items.Insert(0, NewItem);
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83 | if Items.Count > MaxCount then begin
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84 | Items.Delete(Items.Count - 1);
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85 | end;
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86 |
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87 | if WriteToFileEnable then begin
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88 | if Group <> '' then Group := Group + '[' + Group + '] ';
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89 | WriteToFile(Group + Text);
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90 | end;
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91 | finally
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92 | Lock.Release;
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93 | end;
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94 | if Assigned(FOnNewItem) then
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95 | FOnNewItem(NewItem);
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96 | end;
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97 |
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98 | procedure TDebugLog.WriteToFile(Text: string);
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99 | var
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100 | LogFile: TFileStream;
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101 | begin
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102 | if FileName = '' then raise Exception.Create(SFileNameNotDefined);
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103 | try
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104 | if ExtractFileDir(FileName) <> '' then
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105 | ForceDirectories(ExtractFileDir(FileName));
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106 | if FileExists(FileName) then LogFile := TFileStream.Create(FileName, fmOpenWrite)
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107 | else LogFile := TFileStream.Create(FileName, fmCreate);
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108 | LogFile.Seek(0, soFromEnd);
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109 | Text := FormatDateTime('hh:nn:ss.zzz', Now) + ': ' + Text + LineEnding;
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110 | LogFile.WriteBuffer(Text[1], Length(Text));
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111 | finally
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112 | FreeAndNil(LogFile);
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113 | end;
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114 | end;
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115 |
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116 | constructor TDebugLog.Create(AOwner: TComponent);
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117 | begin
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118 | inherited;
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119 | Items := TListObject.Create;
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120 | Lock := TCriticalSection.Create;
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121 | MaxCount := 100;
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122 | FileName := 'DebugLog.txt';
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123 | WriteToFileEnable := False;
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124 | end;
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125 |
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126 | destructor TDebugLog.Destroy;
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127 | begin
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128 | Items.Free;
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129 | Lock.Free;
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130 | inherited;
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131 | end;
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132 |
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133 | end.
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134 |
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