Delphi與XML專題之二 -----Delphi 與 XML 示例（直接利用IXMLDocument）

http://blog.csdn.net/tianguanleiok/
(*) uses msxml,XMLIntf,XMLDoc;

(1)//從文件存取
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);                              //*****  創建TXMLDocument *****
  xmlDoc.Active := True;   iReturn:=-1;
  try
    try
      xmlDoc.LoadFromFile(XMLName) ;                                    //*****  載入XML文件 *****  
      xmlDoc.Version := '1.0';
      xmlDoc.Encoding :='GB2312';
      rootNode := xmlDoc.ChildNodes.FindNode('Document');     //*****  查找結點 *****
      CNode := rootNode.ChildNodes.FindNode('product');
      if CNode<>nil then
      begin
         // iValue := CNode.GetNodeValue;                                    //*****  取結點值 ***** 
        iValue:=CNode.Attributes['proID'];                                     //*****  取結點屬性 ***** 
        while (proID<>iValue) and (CNode<>nil) do   //找某
        begin
          NNode := rootNode.ChildNodes.FindSibling(CNode,1);  //*****  查找下一結點 *****
          CNode := NNode;
          if CNode<>nil then iValue:=CNode.Attributes['proID'];
        end;
      end;
      if CNode=nil then   //某   沒找到 ****
      begin
        CNode:=rootNode.AddChild('product');                              //*****  添加一個結點 *****
        CNode.SetAttribute('proID', proID);                                     // ***** 寫結點屬性 *****
      end;
      CNode.SetAttribute('uninstall', 'false');
      NNode := CNode.ChildNodes.FindNode(nodeName);
      if NNode=nil then
        NNode:=CNode.AddChild(nodeName);
      NNode.SetNodeValue(nodeValue) ;                                       // ***** 寫結點值 *****
      xmlDoc.SaveToFile(XMLName) ;
    except
      iReturn:=-1;
    end;
  finally
    xmlDoc := nil ;                                                                          //*****  釋放TXMLDocument *****
    result := iReturn;
  end;
end;

(2)刪除結點
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 ，刪除

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