1 | unit UCommThread;
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2 |
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3 | {$mode Delphi}{$H+}
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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, blcksock, UCommPin, SyncObjs, UCommon,
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9 | DateUtils, UThreading, SpecializedList, UBinarySerializer;
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10 |
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11 | type
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12 | TCommThread = class;
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13 |
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14 | TReceiveDataEvent = procedure(Stream: TMemoryStream) of object;
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15 |
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16 | { TCommThreadReceiveThread }
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17 |
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18 | TCommThreadReceiveThread = class(TTermThread)
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19 | public
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20 | Parent: TCommThread;
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21 | Stream: TBinarySerializer;
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22 | procedure Execute; override;
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23 | constructor Create(CreateSuspended: Boolean;
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24 | const StackSize: SizeUInt = DefaultStackSize);
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25 | destructor Destroy; override;
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26 | end;
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27 |
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28 | { TCommThread }
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29 |
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30 | TCommThread = class(TCommNode)
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31 | private
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32 | //FOnReceiveData: TReceiveDataEvent;
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33 | FReceiveThread: TCommThreadReceiveThread;
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34 | FInputBuffer: TBinarySerializer;
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35 | FInputBufferLock: TCriticalSection;
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36 | FDataAvailable: TEvent;
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37 | FStatusEvent: TEvent;
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38 | FStatusValue: Integer;
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39 | procedure PinReceiveData(Sender: TCommPin; Stream: TListByte);
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40 | procedure PinSetStatus(Sender: TCommPin; Status: Integer);
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41 | procedure ExtReceiveData(Sender: TCommPin; Stream: TListByte);
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42 | procedure ExtSetStatus(Sender: TCommPin; AStatus: Integer);
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43 | protected
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44 | procedure SetActive(const AValue: Boolean); override;
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45 | public
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46 | Ext: TCommPin;
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47 | Pin: TCommPin;
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48 | constructor Create(AOwner: TComponent); override;
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49 | destructor Destroy; override;
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50 | end;
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51 |
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52 | implementation
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53 |
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54 | { TCommThread }
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55 |
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56 | procedure TCommThread.PinReceiveData(Sender: TCommPin; Stream: TListByte);
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57 | begin
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58 | if FActive then Ext.Send(Stream);
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59 | end;
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60 |
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61 | procedure TCommThread.PinSetStatus(Sender: TCommPin; Status: Integer);
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62 | begin
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63 | if FActive then Ext.Status := Status;
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64 | end;
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65 |
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66 | procedure TCommThread.ExtReceiveData(Sender: TCommPin; Stream: TListByte);
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67 | begin
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68 | try
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69 | FInputBufferLock.Acquire;
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70 | FInputBuffer.WriteList(Stream, 0, Stream.Count);
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71 | FDataAvailable.SetEvent;
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72 | finally
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73 | FInputBufferLock.Release;
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74 | end;
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75 | end;
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76 |
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77 | procedure TCommThread.ExtSetStatus(Sender: TCommPin; AStatus: Integer);
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78 | begin
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79 | try
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80 | FInputBufferLock.Acquire;
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81 | FStatusValue := AStatus;
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82 | FStatusEvent.SetEvent;
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83 | finally
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84 | FInputBufferLock.Release;
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85 | end;
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86 | end;
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87 |
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88 | procedure TCommThread.SetActive(const AValue: Boolean);
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89 | begin
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90 | if FActive = AValue then Exit;
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91 | FActive := AValue;
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92 |
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93 | if AValue then begin
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94 | FReceiveThread := TCommThreadReceiveThread.Create(True);
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95 | FReceiveThread.FreeOnTerminate := False;
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96 | FReceiveThread.Parent := Self;
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97 | FReceiveThread.Name := 'CommThread';
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98 | FReceiveThread.Start;
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99 | end else begin
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100 | FreeAndNil(FReceiveThread);
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101 | end;
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102 | inherited;
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103 | end;
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104 |
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105 | constructor TCommThread.Create(AOwner: TComponent);
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106 | begin
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107 | inherited;
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108 | FInputBuffer := TBinarySerializer.Create;
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109 | FInputBuffer.List := TListByte.Create;
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110 | FInputBuffer.OwnsList := True;
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111 | FInputBufferLock := TCriticalSection.Create;
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112 | Ext := TCommPin.Create;
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113 | Ext.OnReceive := ExtReceiveData;
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114 | Ext.OnSetSatus := ExtSetStatus;
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115 | Ext.Node := Self;
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116 | Pin := TCommPin.Create;
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117 | Pin.OnReceive := PinReceiveData;
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118 | Pin.OnSetSatus := PinSetStatus;
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119 | Pin.Node := Self;
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120 | FDataAvailable := TSimpleEvent.Create;
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121 | FStatusEvent := TSimpleEvent.Create;
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122 | end;
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123 |
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124 | destructor TCommThread.Destroy;
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125 | begin
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126 | Active := False;
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127 | FInputBufferLock.Acquire;
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128 | FreeAndNil(FInputBuffer);
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129 | FreeAndNil(FInputBufferLock);
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130 | FreeAndNil(Ext);
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131 | FreeAndNil(Pin);
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132 | FreeAndNil(FStatusEvent);
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133 | FreeAndNil(FDataAvailable);
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134 | inherited;
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135 | end;
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136 |
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137 | { TCommThreadReceiveThread }
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138 |
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139 | procedure TCommThreadReceiveThread.Execute;
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140 | var
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141 | TempStatus: Integer;
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142 | DoSleep: Boolean;
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143 | begin
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144 | with Parent do
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145 | repeat
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146 | DoSleep := True;
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147 | // Check if new data arrived
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148 | if FDataAvailable.WaitFor(0) = wrSignaled then begin
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149 | DoSleep := False;
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150 | try
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151 | FInputBufferLock.Acquire;
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152 | Stream.List.Assign(FInputBuffer.List);
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153 | FDataAvailable.ResetEvent;
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154 | FInputBuffer.Clear;
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155 | finally
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156 | FInputBufferLock.Release;
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157 | end; // else Yield;
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158 | Pin.Send(Stream.List);
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159 | end;
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160 |
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161 | // Check if state changed
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162 | if FStatusEvent.WaitFor(0) = wrSignaled then begin
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163 | DoSleep := False;
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164 | try
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165 | FInputBufferLock.Acquire;
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166 | TempStatus := FStatusValue;
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167 | finally
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168 | FStatusEvent.ResetEvent;
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169 | FInputBufferLock.Release;
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170 | end;
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171 | Pin.Status := TempStatus;
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172 | end;
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173 | if not Terminated and DoSleep then begin
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174 | Sleep(1);
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175 | end;
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176 | until Terminated;
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177 | end;
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178 |
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179 | constructor TCommThreadReceiveThread.Create(CreateSuspended: Boolean;
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180 | const StackSize: SizeUInt);
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181 | begin
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182 | inherited;
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183 | Stream := TBinarySerializer.Create;
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184 | Stream.List := TListByte.Create;
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185 | Stream.OwnsList := True;
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186 | end;
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187 |
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188 | destructor TCommThreadReceiveThread.Destroy;
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189 | begin
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190 | Stream.Free;
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191 | inherited;
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192 | end;
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193 |
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194 | end.
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195 |
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