Este código mostra como usar TXMLDocument para salvar e restaurar configurações em um documento XML. O método publico trabalha como um TIniFile. O código não precisa ser comentado porque é auto explicativo e pequeno. Foi testado apenas no Delphi 7.
unit uCiaXml;
interface
uses
Forms, SysUtils, Windows, XmlIntf, XMLDoc;
type
TXMLConfig = class
private
FModified: Boolean;
FFileName: string;
FXMLDoc: TXMLDocument;
FBackup: Boolean;
function GetVersion: string;
public
constructor Create(const FileName: string); overload;
constructor Create; overload;
destructor Destroy; override;
procedure Save;
function ReadString(const Section, Key, default: string): string;
procedure WriteString(const Section, Key, Value: string);
function ReadInteger(const Section, Key: string; default: Integer): Integer;
procedure WriteInteger(const Section, Key: string; Value: Integer);
function ReadBoolean(const Section, Key: string; default: Boolean): Boolean;
procedure WriteBoolean(const Section, Key: string; Value: Boolean);
property Backup: Boolean read FBackup write FBackup;
property Version: string read GetVersion;
end;
implementation
{ TXMLConfig }
constructor TXMLConfig.Create(const FileName: string);
begin
inherited Create;
FBackup := True;
FFileName := FileName;
FXMLDoc := TXMLDocument.Create(Application);
FXMLDoc.Options := [doNodeAutoIndent];
if FileExists(FFileName) then
FXMLDoc.LoadFromFile(FFileName)
else
begin
FXMLDoc.Active := True;
FXMLDoc.AddChild('Configuration');
end;
end;
constructor TXMLConfig.Create;
begin
Create(ChangeFileExt(Application.Exename, '_cfg.xml'));
end;
destructor TXMLConfig.Destroy;
begin
Save;
FXMLDoc.Destroy;
inherited;
end;
function TXMLConfig.GetVersion: string;
begin
Result := '1.00';
end;
function TXMLConfig.ReadBoolean(const Section, Key: string; default: Boolean): Boolean;
begin
Result := Boolean(ReadInteger(Section, Key, Integer(default)));
end;
function TXMLConfig.ReadInteger(const Section, Key: string; default: Integer): Integer;
begin
Result := StrToInt(ReadString(Section, Key, IntToStr(default)));
end;
function TXMLConfig.ReadString(const Section, Key, default: string): string;
var
Node: IXMLNode;
begin
Node := FXMLDoc.DocumentElement.ChildNodes.FindNode(Section);
if Assigned(Node) and Node.HasAttribute(Key) then
Result := Node.Attributes[Key]
else
Result := default;
end;
procedure TXMLConfig.Save;
begin
if not FModified then
Exit;
if FBackup then
CopyFile(PChar(FFileName), PChar(FFileName + '.bak'), False);
FXMLDoc.SaveToFile(FFileName);
FModified := False;
end;
procedure TXMLConfig.WriteBoolean(const Section, Key: string; Value: Boolean);
begin
WriteInteger(Section, Key, Integer(Value));
end;
procedure TXMLConfig.WriteInteger(const Section, Key: string; Value: Integer);
begin
WriteString(Section, Key, IntToStr(Value));
end;
procedure TXMLConfig.WriteString(const Section, Key, Value: string);
var
Node: IXMLNode;
begin
if ReadString(Section, Key, '') = Value then
Exit;
Node := FXMLDoc.DocumentElement.ChildNodes.FindNode(Section);
if not Assigned(Node) then
Node := FXMLDoc.DocumentElement.AddChild(Section);
Node.Attributes[Key] := Value;
FModified := True;
end;
end.
