Added: object persistancy classes (writing an object to the registry using RTTI)
Changed: TSplitArray -> TStringDynArray (backwards compatible)
This commit is contained in:
parent
5a274c11ef
commit
b86e2def4a
413
X2UtPersist.pas
Normal file
413
X2UtPersist.pas
Normal file
@ -0,0 +1,413 @@
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unit X2UtPersist;
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interface
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uses
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Classes,
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Types,
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TypInfo;
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type
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TX2IterateObjectProc = procedure(AObject: TObject; APropInfo: PPropInfo; var AContinue: Boolean) of object;
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TX2CustomPersist = class(TObject)
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private
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FSections: TStrings;
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protected
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function IterateObject(AObject: TObject; ACallback: TX2IterateObjectProc): Boolean; virtual;
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procedure ReadObject(AObject: TObject; APropInfo: PPropInfo; var AContinue: Boolean);
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procedure WriteObject(AObject: TObject; APropInfo: PPropInfo; var AContinue: Boolean);
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protected
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function DoRead(AObject: TObject): Boolean; virtual;
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procedure DoWrite(AObject: TObject); virtual;
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function BeginSection(const AName: String): Boolean; virtual;
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procedure EndSection(); virtual;
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function ReadInteger(const AName: String; out AValue: Integer): Boolean; virtual; abstract;
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function ReadFloat(const AName: String; out AValue: Extended): Boolean; virtual; abstract;
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function ReadString(const AName: String; out AValue: String): Boolean; virtual; abstract;
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function ReadInt64(const AName: String; out AValue: Int64): Boolean; virtual; abstract;
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procedure ReadCollection(const AName: String; ACollection: TCollection); virtual;
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procedure ReadStream(const AName: String; AStream: TStream); virtual;
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function WriteInteger(const AName: String; AValue: Integer): Boolean; virtual; abstract;
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function WriteFloat(const AName: String; AValue: Extended): Boolean; virtual; abstract;
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function WriteString(const AName, AValue: String): Boolean; virtual; abstract;
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function WriteInt64(const AName: String; AValue: Int64): Boolean; virtual; abstract;
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procedure ClearCollection(); virtual;
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procedure WriteCollection(const AName: String; ACollection: TCollection); virtual;
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procedure WriteStream(const AName: String; AStream: TStream); virtual;
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property Sections: TStrings read FSections;
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public
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constructor Create();
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destructor Destroy(); override;
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function Read(AObject: TObject): Boolean; virtual;
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procedure Write(AObject: TObject); virtual;
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end;
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const
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CollectionCountName = 'Count';
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CollectionItemNamePrefix = 'Item';
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implementation
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uses
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SysUtils,
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X2UtStrings;
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{ TX2CustomPersist }
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constructor TX2CustomPersist.Create();
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begin
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inherited;
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FSections := TStringList.Create();
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end;
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destructor TX2CustomPersist.Destroy();
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begin
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FreeAndNil(FSections);
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inherited;
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end;
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function TX2CustomPersist.IterateObject(AObject: TObject; ACallback: TX2IterateObjectProc): Boolean;
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var
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propCount: Integer;
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propList: PPropList;
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propIndex: Integer;
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propInfo: PPropInfo;
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continue: Boolean;
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begin
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Result := True;
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{ Iterate through published properties }
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propCount := GetPropList(AObject.ClassInfo, tkProperties, nil);
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if propCount > 0 then
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begin
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GetMem(propList, propCount * SizeOf(PPropInfo));
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try
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GetPropList(AObject.ClassInfo, tkProperties, propList);
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continue := True;
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for propIndex := 0 to Pred(propCount) do
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begin
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propInfo := propList^[propIndex];
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ACallback(AObject, propInfo, continue);
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if not continue then
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begin
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Result := False;
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Break;
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end;
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end;
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finally
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FreeMem(propList, propCount * SizeOf(PPropInfo));
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end;
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end;
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end;
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function TX2CustomPersist.Read(AObject: TObject): Boolean;
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begin
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Assert(Assigned(AObject), 'AObject must be assigned.');
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Result := DoRead(AObject);
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end;
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procedure TX2CustomPersist.Write(AObject: TObject);
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begin
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Assert(Assigned(AObject), 'AObject must be assigned.');
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DoWrite(AObject);
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end;
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function TX2CustomPersist.DoRead(AObject: TObject): Boolean;
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begin
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IterateObject(AObject, ReadObject);
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Result := True;
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end;
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procedure TX2CustomPersist.DoWrite(AObject: TObject);
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begin
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IterateObject(AObject, WriteObject);
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end;
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function TX2CustomPersist.BeginSection(const AName: String): Boolean;
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begin
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FSections.Add(AName);
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Result := True;
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end;
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procedure TX2CustomPersist.EndSection();
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begin
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Assert(FSections.Count > 0, 'EndSection called without BeginSection');
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FSections.Delete(Pred(FSections.Count));
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end;
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procedure TX2CustomPersist.ReadObject(AObject: TObject; APropInfo: PPropInfo;
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var AContinue: Boolean);
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var
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ordValue: Integer;
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floatValue: Extended;
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stringValue: String;
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int64Value: Int64;
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objectProp: TObject;
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begin
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{ Only read writable properties }
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if (APropInfo^.PropType^.Kind <> tkClass) and
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(not Assigned(APropInfo^.SetProc)) then
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Exit;
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case APropInfo^.PropType^.Kind of
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tkInteger,
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tkChar,
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tkWChar:
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if ReadInteger(APropInfo^.Name, ordValue) then
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SetOrdProp(AObject, APropInfo, ordValue);
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tkFloat:
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if ReadFloat(APropInfo^.Name, floatValue) then
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SetFloatProp(AObject, APropInfo, floatValue);
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tkEnumeration:
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if ReadString(APropInfo^.Name, stringValue) then
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begin
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ordValue := GetEnumValue(APropInfo^.PropType^, stringValue);
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if ordValue >= 0 then
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SetOrdProp(AObject, APropInfo, ordValue);
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end;
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tkString,
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tkLString,
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tkWString:
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if ReadString(APropInfo^.Name, stringValue) then
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SetStrProp(AObject, APropInfo, stringValue);
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tkSet:
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if ReadString(APropInfo^.Name, stringValue) then
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begin
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try
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ordValue := StringToSet(APropInfo, stringValue);
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SetOrdProp(AObject, APropInfo, ordValue);
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except
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on E:EPropertyConvertError do;
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end;
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end;
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tkVariant:
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if ReadString(APropInfo^.Name, stringValue) then
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SetVariantProp(AObject, APropInfo, stringValue);
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tkInt64:
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if ReadInt64(APropInfo^.Name, int64Value) then
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SetInt64Prop(AObject, APropInfo, int64Value);
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tkClass:
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begin
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objectProp := GetObjectProp(AObject, APropInfo);
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if Assigned(objectProp) then
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begin
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if objectProp is TStream then
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begin
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ReadStream(APropInfo^.Name, TStream(objectProp));
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end else
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begin
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{ Recurse into object properties }
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if BeginSection(APropInfo^.Name) then
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try
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if objectProp is TCollection then
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ReadCollection(APropInfo^.Name, TCollection(objectProp));
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AContinue := IterateObject(objectProp, ReadObject);
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finally
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EndSection();
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end;
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end;
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end;
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end;
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end;
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end;
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procedure TX2CustomPersist.WriteObject(AObject: TObject; APropInfo: PPropInfo; var AContinue: Boolean);
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var
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ordValue: Integer;
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floatValue: Extended;
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stringValue: String;
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int64Value: Int64;
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objectProp: TObject;
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begin
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{ Only write read/writable properties which have IsStored True }
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if (APropInfo^.PropType^.Kind <> tkClass) and
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(not (Assigned(APropInfo^.GetProc) and
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Assigned(APropInfo^.SetProc) and
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IsStoredProp(AObject, APropInfo))) then
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Exit;
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case APropInfo^.PropType^.Kind of
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tkInteger,
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tkChar,
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tkWChar:
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begin
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ordValue := GetOrdProp(AObject, APropInfo);
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WriteInteger(APropInfo^.Name, ordValue);
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end;
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tkFloat:
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begin
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floatValue := GetFloatProp(AObject, APropInfo);
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WriteFloat(APropInfo^.Name, floatValue);
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end;
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tkEnumeration:
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begin
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ordValue := GetOrdProp(AObject, APropInfo);
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stringValue := GetEnumName(APropInfo^.PropType^, ordValue);
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WriteString(APropInfo^.Name, stringValue);
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end;
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tkString,
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tkLString,
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tkWString:
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begin
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stringValue := GetStrProp(AObject, APropInfo);
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WriteString(APropInfo^.Name, stringValue);
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end;
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tkSet:
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begin
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ordValue := GetOrdProp(AObject, APropInfo);
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stringValue := SetToString(APropInfo, ordValue, True);
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WriteString(APropInfo^.Name, stringValue);
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end;
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tkVariant:
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begin
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stringValue := GetVariantProp(AObject, APropInfo);
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WriteString(APropInfo^.Name, stringValue);
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end;
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tkInt64:
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begin
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int64Value := GetInt64Prop(AObject, APropInfo);
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WriteInt64(APropInfo^.Name, int64Value);
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end;
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tkClass:
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begin
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objectProp := GetObjectProp(AObject, APropInfo);
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if Assigned(objectProp) then
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begin
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if objectProp is TStream then
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begin
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WriteStream(APropInfo^.Name, TStream(objectProp));
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end else
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begin
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{ Recurse into object properties }
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if BeginSection(APropInfo^.Name) then
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try
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if objectProp is TCollection then
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WriteCollection(APropInfo^.Name, TCollection(objectProp));
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AContinue := IterateObject(objectProp, WriteObject);
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finally
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EndSection();
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end;
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end;
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end;
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end;
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end;
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end;
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procedure TX2CustomPersist.ReadCollection(const AName: String; ACollection: TCollection);
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var
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itemCount: Integer;
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itemIndex: Integer;
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collectionItem: TCollectionItem;
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begin
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if ReadInteger(CollectionCountName, itemCount) then
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begin
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ACollection.BeginUpdate();
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try
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ACollection.Clear();
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for itemIndex := 0 to Pred(itemCount) do
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begin
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if BeginSection(CollectionItemNamePrefix + IntToStr(itemIndex)) then
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try
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collectionItem := ACollection.Add();
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IterateObject(collectionItem, ReadObject);
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finally
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EndSection();
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end;
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end;
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finally
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ACollection.EndUpdate();
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end;
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end;
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end;
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procedure TX2CustomPersist.ReadStream(const AName: String; AStream: TStream);
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begin
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// #ToDo1 (MvR) 8-6-2007: ReadStream
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end;
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procedure TX2CustomPersist.ClearCollection();
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begin
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end;
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procedure TX2CustomPersist.WriteCollection(const AName: String; ACollection: TCollection);
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var
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itemIndex: Integer;
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begin
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ClearCollection();
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WriteInteger(CollectionCountName, ACollection.Count);
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for itemIndex := 0 to Pred(ACollection.Count) do
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begin
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if BeginSection(CollectionItemNamePrefix + IntToStr(itemIndex)) then
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try
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IterateObject(ACollection.Items[itemIndex], WriteObject);
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finally
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EndSection();
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end;
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end;
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end;
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procedure TX2CustomPersist.WriteStream(const AName: String; AStream: TStream);
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begin
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// #ToDo1 (MvR) 8-6-2007: WriteStream
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end;
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end.
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285
X2UtPersistRegistry.pas
Normal file
285
X2UtPersistRegistry.pas
Normal file
@ -0,0 +1,285 @@
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unit X2UtPersistRegistry;
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interface
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uses
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Classes,
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Registry,
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Windows,
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X2UtPersist;
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type
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TX2UtPersistRegistry = class(TX2CustomPersist)
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private
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FKey: String;
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FRootKey: HKEY;
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FRegistry: TRegistry;
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FReading: Boolean;
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protected
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procedure InitRegistry(AReading: Boolean);
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procedure FinalizeRegistry();
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function OpenKey(const ANewKey: String): Boolean;
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function DoRead(AObject: TObject): Boolean; override;
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procedure DoWrite(AObject: TObject); override;
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function BeginSection(const AName: String): Boolean; override;
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procedure EndSection(); override;
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function ReadInteger(const AName: String; out AValue: Integer): Boolean; override;
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function ReadFloat(const AName: String; out AValue: Extended): Boolean; override;
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function ReadString(const AName: String; out AValue: String): Boolean; override;
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function ReadInt64(const AName: String; out AValue: Int64): Boolean; override;
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function WriteInteger(const AName: String; AValue: Integer): Boolean; override;
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function WriteFloat(const AName: String; AValue: Extended): Boolean; override;
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function WriteString(const AName, AValue: String): Boolean; override;
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function WriteInt64(const AName: String; AValue: Int64): Boolean; override;
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procedure ClearCollection(); override;
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property Registry: TRegistry read FRegistry;
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public
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constructor Create();
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destructor Destroy(); override;
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property Key: String read FKey write FKey;
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property RootKey: HKEY read FRootKey write FRootKey;
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end;
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{ Wrapper functions }
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function ReadFromRegistry(AObject: TObject; const AKey: String; ARootKey: HKEY = HKEY_CURRENT_USER): Boolean;
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procedure WriteToRegistry(AObject: TObject; const AKey: String; ARootKey: HKEY = HKEY_CURRENT_USER);
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implementation
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uses
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SysUtils,
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X2UtStrings;
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const
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RegistrySeparator = '\';
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{ Wrapper functions }
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function ReadFromRegistry(AObject: TObject; const AKey: String; ARootKey: HKEY): Boolean;
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begin
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with TX2UtPersistRegistry.Create() do
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try
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RootKey := ARootKey;
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Key := AKey;
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Result := Read(AObject);
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finally
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Free();
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end;
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end;
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procedure WriteToRegistry(AObject: TObject; const AKey: String; ARootKey: HKEY);
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begin
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with TX2UtPersistRegistry.Create() do
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try
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RootKey := ARootKey;
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Key := AKey;
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Write(AObject);
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finally
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Free();
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end;
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end;
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{ TX2UtPersistRegistry }
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constructor TX2UtPersistRegistry.Create();
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begin
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inherited;
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FRootKey := HKEY_CURRENT_USER;
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end;
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destructor TX2UtPersistRegistry.Destroy();
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begin
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inherited;
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end;
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procedure TX2UtPersistRegistry.InitRegistry(AReading: Boolean);
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begin
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FReading := AReading;
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if AReading then
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FRegistry := TRegistry.Create(KEY_READ)
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else
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FRegistry := TRegistry.Create();
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FRegistry.RootKey := Self.RootKey;
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end;
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procedure TX2UtPersistRegistry.FinalizeRegistry();
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begin
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FreeAndNil(FRegistry);
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end;
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function TX2UtPersistRegistry.OpenKey(const ANewKey: String): Boolean;
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var
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keyName: String;
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sectionIndex: Integer;
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begin
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keyName := Self.Key;
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if (Length(keyName) > 0) and (keyName[Length(keyName)] = RegistrySeparator) then
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SetLength(keyName, Pred(Length(keyName)));
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for sectionIndex := 0 to Pred(Sections.Count) do
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keyName := keyName + RegistrySeparator + Sections[sectionIndex];
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|
||||
if Length(ANewKey) > 0 then
|
||||
keyName := keyName + RegistrySeparator + ANewKey;
|
||||
|
||||
|
||||
if Length(keyName) > 0 then
|
||||
begin
|
||||
if FReading then
|
||||
Result := FRegistry.OpenKeyReadOnly(keyName)
|
||||
else
|
||||
Result := FRegistry.OpenKey(keyName, True);
|
||||
end else
|
||||
Result := False;
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.DoRead(AObject: TObject): Boolean;
|
||||
begin
|
||||
InitRegistry(True);
|
||||
try
|
||||
OpenKey('');
|
||||
Result := inherited DoRead(AObject);
|
||||
finally
|
||||
FinalizeRegistry();
|
||||
end;
|
||||
end;
|
||||
|
||||
|
||||
procedure TX2UtPersistRegistry.DoWrite(AObject: TObject);
|
||||
begin
|
||||
InitRegistry(False);
|
||||
try
|
||||
OpenKey('');
|
||||
inherited DoWrite(AObject);
|
||||
finally
|
||||
FinalizeRegistry();
|
||||
end;
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.BeginSection(const AName: String): Boolean;
|
||||
begin
|
||||
Result := OpenKey(AName);
|
||||
|
||||
if Result then
|
||||
inherited BeginSection(AName);
|
||||
end;
|
||||
|
||||
|
||||
procedure TX2UtPersistRegistry.EndSection();
|
||||
begin
|
||||
inherited;
|
||||
|
||||
{ Re-open the previous section }
|
||||
OpenKey('');
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.ReadInteger(const AName: String; out AValue: Integer): Boolean;
|
||||
begin
|
||||
Result := Registry.ValueExists(AName);
|
||||
if Result then
|
||||
AValue := Registry.ReadInteger(AName);
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.ReadFloat(const AName: String; out AValue: Extended): Boolean;
|
||||
begin
|
||||
Result := Registry.ValueExists(AName);
|
||||
if Result then
|
||||
AValue := Registry.ReadFloat(AName);
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.ReadString(const AName: String; out AValue: String): Boolean;
|
||||
begin
|
||||
Result := Registry.ValueExists(AName);
|
||||
if Result then
|
||||
AValue := Registry.ReadString(AName);
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.ReadInt64(const AName: String; out AValue: Int64): Boolean;
|
||||
begin
|
||||
Result := (Registry.GetDataSize(AName) = SizeOf(AValue));
|
||||
if Result then
|
||||
Registry.ReadBinaryData(AName, AValue, SizeOf(AValue));
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.WriteInteger(const AName: String; AValue: Integer): Boolean;
|
||||
begin
|
||||
Registry.WriteInteger(AName, AValue);
|
||||
Result := True;
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.WriteFloat(const AName: String; AValue: Extended): Boolean;
|
||||
begin
|
||||
Registry.WriteFloat(AName, AValue);
|
||||
Result := True;
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.WriteString(const AName, AValue: String): Boolean;
|
||||
begin
|
||||
Registry.WriteString(AName, AValue);
|
||||
Result := True;
|
||||
end;
|
||||
|
||||
|
||||
function TX2UtPersistRegistry.WriteInt64(const AName: String; AValue: Int64): Boolean;
|
||||
begin
|
||||
Registry.WriteBinaryData(AName, AValue, SizeOf(AValue));
|
||||
Result := True;
|
||||
end;
|
||||
|
||||
|
||||
procedure TX2UtPersistRegistry.ClearCollection();
|
||||
var
|
||||
keyNames: TStringList;
|
||||
keyIndex: Integer;
|
||||
|
||||
begin
|
||||
inherited;
|
||||
|
||||
keyNames := TStringList.Create();
|
||||
try
|
||||
Registry.GetKeyNames(keyNames);
|
||||
|
||||
for keyIndex := 0 to Pred(keyNames.Count) do
|
||||
if SameTextS(keyNames[keyIndex], CollectionItemNamePrefix) then
|
||||
Registry.DeleteKey(keyNames[keyIndex]);
|
||||
finally
|
||||
FreeAndNil(keyNames);
|
||||
end;
|
||||
end;
|
||||
|
||||
end.
|
||||
|
||||
@ -7,9 +7,13 @@
|
||||
unit X2UtStrings;
|
||||
|
||||
interface
|
||||
uses
|
||||
Types;
|
||||
|
||||
type
|
||||
//** Array of string values.
|
||||
TSplitArray = array of String;
|
||||
{** Backwards compatibility }
|
||||
TSplitArray = TStringDynArray;
|
||||
|
||||
|
||||
{** Formats the specified size.
|
||||
*
|
||||
@ -74,7 +78,7 @@ type
|
||||
* @todo though optimized, it now fails on #0 characters, need
|
||||
* to determine the end by checking the AnsiString length.
|
||||
*}
|
||||
procedure Split(const ASource, ADelimiter: String; out ADest: TSplitArray);
|
||||
procedure Split(const ASource, ADelimiter: String; out ADest: TStringDynArray);
|
||||
|
||||
{** Appends string parts with a specified glue value.
|
||||
*
|
||||
@ -82,7 +86,7 @@ type
|
||||
* @param AGlue the string added between the parts
|
||||
* @result the composed parts
|
||||
*}
|
||||
function Join(const ASource: TSplitArray; const AGlue: String): String;
|
||||
function Join(const ASource: TStringDynArray; const AGlue: String): String;
|
||||
|
||||
{** Determines if one path is the child of another path.
|
||||
*
|
||||
@ -196,7 +200,7 @@ begin
|
||||
end;
|
||||
|
||||
|
||||
procedure Split(const ASource, ADelimiter: String; out ADest: TSplitArray);
|
||||
procedure Split(const ASource, ADelimiter: String; out ADest: TStringDynArray);
|
||||
// StrPos is slow. Sloooooow slow. This function may not be advanced or
|
||||
// the fastest one around, but it sure kicks StrPos' ass.
|
||||
// 11.5 vs 1.7 seconds on a 2.4 Ghz for 10.000 iterations, baby!
|
||||
@ -317,7 +321,7 @@ begin
|
||||
until False;
|
||||
end;
|
||||
|
||||
function Join(const ASource: TSplitArray; const AGlue: String): String;
|
||||
function Join(const ASource: TStringDynArray; const AGlue: String): String;
|
||||
var
|
||||
iGlue: Integer;
|
||||
iHigh: Integer;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user