XML和对象属性互转的基类

本人做了一个XML和对象属性互转的基类，现在放上来有兴趣拿去看一下，用法很简单，声明一个BaseConversion的子类，该子类与你想转换的对象相对应，然后覆盖基类的两个虚方法，然后在里面写元素与对象属性的转换即可以，废话少说了，还是看代码了，例子也懒得去写了，相信不会很难看懂的：

unitXMLConversion;

{*******************************************
*brief:XML和对象属性的转换
*autor:linzhenqun
*date:<chsdate w:st="on" isrocdate="False" islunardate="False" day="26" month="10" year="2005">2005-10-26</chsdate>
*email:linzhengqun@163.com
*blog:http://blog.youkuaiyun.com/linzhengqun
********************************************}

interface
uses
Classes,SysUtils,xmldom,XMLIntf,oxmldom,XMLDoc;

Type

TBaseConversion=class
protected
FXMLDoc:TXMLDocument;

(*在ParenElem元素下增加一个子元素*)
functionAppendChildElement(constTagName,Value:WideString;
ParenElem:IDOMElement):IDOMElement;

(*根据TagName取得XML节点下的某一个子节点*)
functionGetSingleEleByTagName(AEle:IDOMElement;TagName:WideString):IDOMElement;

(*取得XML节点的文本*)
functionGetElementText(AElement:IDOMNode):WideString;

(*IDOMElement的text值转换成各种类型的数据，
如果AElem=nil或者text不符合某些数据类型，返回Default值*)
functionEleTextToBoolDef(AElem:IDOMElement;constDefault:Boolean):Boolean;
functionEleTextToStrDef(AElem:IDOMElement;constDefault:WideString):WideString;
functionEleTextToIntDef(AElem:IDOMElement;constDefault:Integer):Integer;
functionEleTextToFloatDef(AElem:IDOMElement;constDefault:Extended):Extended;

(*取得IDomElement的属性的值，并转换成各种类型
如果不符合数据类型，返回Default值*)
functionEleAttrToBoolDef(AElem:IDOMElement;AttrName:WideString;
constDefault:Boolean):Boolean;
functionEleAttrToStrDef(AElem:IDOMElement;AttrName:WideString;
constDefault:WideString):WideString;
functionEleAttrToIntDef(AElem:IDOMElement;AttrName:WideString;
constDefault:Integer):Integer;
functionEleAttrToFloatDef(AElem:IDOMElement;AttrName:WideString;
constDefault:Extended):Extended;

procedureObjPropertyToElements(Obj:TObject);virtual;
procedureElementsToObjProperty(Obj:TObject);virtual;
public
procedureXMLToObjProperty(XMLStream:TStream;Obj:TObject);
procedureObjPropertyToXML(XMLStream:TStream;Obj:TObject);
constructorCreate;
destructorDestroy;override;
end;

implementation

{TBaseConversion}

functionTBaseConversion.AppendChildElement(constTagName,
Value:WideString;ParenElem:IDOMElement):IDOMElement;
var
Text:IDOMText;
begin
Result:=FXMLDoc.DOMDocument.createElement(TagName);
ifValue<>''then
begin
Text:=FXMLDoc.DOMDocument.createTextNode(Value);
Result.appendChild(Text);
end;
ParenElem.appendChild(Result);
end;

constructorTBaseConversion.Create;
var
Vendor:TDOMVendor;
begin
FXMLDoc:=TXMLDocument.Create(nil);

//下面这几句代码可以去掉，则将使用MSXML来解析
//现在是用OpenXML的原生代码解析
Vendor:=DOMVendors.Find('OpenXML');
ifVendor<>nilthen
FXMLDoc.DOMVendor:=Vendor;
end;

destructorTBaseConversion.Destroy;
begin
FXMLDoc.Free;
inherited;
end;

functionTBaseConversion.EleAttrToBoolDef(AElem:IDOMElement;AttrName:WideString;
constDefault:Boolean):Boolean;
var
LNode:IDOMNode;
begin
Result:=Default;
ifAElem<>nilthen
begin
LNode:=AElem.attributes.getNamedItem(AttrName);
ifLNode<>nilthen
Result:=StrToBoolDef(LNode.nodeValue,Default);
end
end;