Delphi 与 XML 示例（直接利用IXMLDocument）

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(*) uses msxml,XMLIntf,XMLDoc;

(1)//从文件存取
function writeXML(XMLName,nodeName,nodeValue:string;proID:integer):integer;
var
xmlDoc:IXMLDocument;
rootNode,CNode,NNode:IXMLNode;
iValue,iReturn:integer;
sValue:string;
begin
result := -1 ;
if not fileExists(XMLName) then exit;
xmlDoc := TXMLDocument.Create(nil);                              //*****  创建TXMLDocument *****
xmlDoc.Active := True;   iReturn:=-1;
try
    try
      xmlDoc.LoadFromFile(XMLName) ;                                  //*****  载入XML文件 *****
      xmlDoc.Version := '1.0';
      xmlDoc.Encoding :='GB2312';
      rootNode := xmlDoc.ChildNodes.FindNode('Document');     //***** 查找结点 *****
      CNode := rootNode.ChildNodes.FindNode('product');
      if CNode<>nil then
      begin
         // iValue := CNode.GetNodeValue;                                    //***** 取结点值 *****
        iValue:=CNode.Attributes['proID'];                                     //***** 取结点属性 *****
        while (proID<>iValue) and (CNode<>nil) do   //找某
        begin
          NNode := rootNode.ChildNodes.FindSibling(CNode,1); //***** 查找下一结点 *****
          CNode := NNode;
          if CNode<>nil then iValue:=CNode.Attributes['proID'];
        end;
      end;
      if CNode=nil then   //某没找到 ****
      begin
        CNode:=rootNode.AddChild('product');                              //***** 添加一个结点 *****
        CNode.SetAttribute('proID', proID);                                     // ***** 写结点属性 *****
      end;
      CNode.SetAttribute('uninstall', 'false');
      NNode := CNode.ChildNodes.FindNode(nodeName);
      if NNode=nil then
        NNode:=CNode.AddChild(nodeName);
      NNode.SetNodeValue(nodeValue) ;                                      // ***** 写结点值 *****
      xmlDoc.SaveToFile(XMLName) ;
    except
      iReturn:=-1;
    end;
finally
    xmlDoc := nil ;                                                                          //*****  释放TXMLDocument *****
    result := iReturn;
end;
end;

(2)删除结点
function removeNode(XMLName:string;proID:integer):integer;
var
xmlDoc:IXMLDocument;
rootNode,CNode,NNode:IXMLNode;
iValue,iReturn:integer;
sValue:string;
begin
result := -1 ;
if not fileExists(XMLName) then exit;
xmlDoc := TXMLDocument.Create(nil);
xmlDoc.Active := True;   iReturn:=-1;
try
    try
      xmlDoc.LoadFromFile(XMLName) ;
      xmlDoc.Encoding :='GB2312';
      rootNode := xmlDoc.ChildNodes.FindNode('Document');
      CNode := rootNode.ChildNodes.FindNode('product');
      if CNode<>nil then
      begin
        iValue:=CNode.Attributes['proID'];
        while (proID<>iValue) and (CNode<>nil) do   //找某
        begin
          NNode := rootNode.ChildNodes.FindSibling(CNode,1);
          CNode := NNode;
          if CNode<>nil then iValue:=CNode.Attributes['proID'];
        end;

end;
if CNode<>nil then rootNode.ChildNodes.Remove(CNode); //找到，删除

      xmlDoc.SaveToFile(XMLName) ;
      iReturn := 0;
    except
      iReturn:=-1;
    end;
finally
    xmlDoc := nil ;
    result := iReturn;
end;
end;