在XMLDocument中使用DocumentElement时发生访问冲突

问题描述

当我尝试使用 XMLDocument 的 DocumentElement 时，总是遇到访问冲突。我根据文件的存在创建了 XMLDocument 。

I always get an access violation when I try to use the DocumentElement of the XMLDocument. I create XMLDocument based on the existence of some file.

错误消息

我的代码

unit XMLBase;

interface
uses
  SysUtils, xmldom, XMLIntf, XMLDoc, Forms;

type
  TXMLbase = class
  private
    { Private declarations }
  public
    XMLDocument1: TXMLDocument;
    root: IXMLNode;
    constructor Create;
  end;

var
  fn: string;

implementation

constructor TXMLbase.Create;
begin
  fn := ChangeFileExt(Application.ExeName, '.xml');
  XMLDocument1 := TXMLDocument.Create(nil);
  XMLDocument1.Options := [doNodeAutoIndent];
  XMLDocument1.Active := False;
  //optional, is used to indent the Xml document
  if FileExists(fn) then
  begin
  XMLDocument1.LoadFromFile(fn);
  XMLDocument1.Active:= True;
  root := XMLDocument1.DocumentElement;  //<<--- Access Voilation
  end
  else
  begin
    XMLDocument1.Active := False;
    XMLDocument1.XML.Text := '';
    XMLDocument1.Active := True;
    root := XMLDocument1.AddChild('Settings');
  end;
XMLDocument1.SaveToFile(fn);
end;

end.

由于对象或指针的初始化不正确而导致访问冲突，这是否意味着 XMLDocument 是否未初始化？

Access violations arise due to improper initialization of object or pointers, does that mean that the XMLDocument is not being initialized?

推荐答案

如David所示，只是将XMLDocument1声明从 XMLDocument1：TXMLDocument 到 XMLDocument1：IXMLDocument 解决了该问题。您的问题与

As indicated by David just changing your XMLDocument1 declaration from XMLDocument1: TXMLDocument to XMLDocument1: IXMLDocument solves the problem. Your issue is related to Using TXmlDocument

这篇关于在XMLDocument中使用DocumentElement时发生访问冲突的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！