C++ Qt QXmlStreamReader访问冲突

我使用的是Qt5.11.1（MSVSC2015 32位）和QtCreator 4.6.2。 我在使用QXmlStreamReader解析XML时遇到问题。代码是基于。 当我的代码被执行时，它在checkWarnMessage函数中的QIODevice.cpp中产生访问冲突。 这显示了调用堆栈和发生访问冲突的确切线路

实际的XML i更复杂，并且具有嵌套元素。解析XML的函数的实现方式与Qt示例中的void XbelReader:：readXBEL（）函数相同（根据元素名称调用相应的函数来解析该元素）。但通过这个简单的例子，我成功地重现了我在实际解决方案中遇到的问题

XML是：

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <element1>1</element1>
    <element2>2</element2>
    <element3>3</element3>
    <element4>4</element4>
    <element5>5</element5>
    <element6>6</element6>
</root>

访问冲突不会发生

我真的不知道我做错了什么。或者QXmlStreamReader中是否存在错误？我认为即使我做错了什么，Qt库中也不应该发生访问冲突

整个项目（XmlParser.pro、main.cpp和config.xml）都可以从这里下载

编辑

我已经按照Manthan的建议修复了我的示例，并且它按照预期工作。我在XML中又添加了一个东西。我在element1之前添加了大量多行注释。注释本身有8019个字符，包括空格字符，而整个XML文件有8266个字符

XML现在看起来像

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <!--
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment,
    comment, comment, co
    -->
    <element1>1</element1>
    <element2>2</element2>
    <element3>3</element3>
    <element4>4</element4>
    <element5>5</element5>
    <element6>6</element6>
</root>

1.
2.
3.
4.
5.
6.

我已经检查过XML在Notepad++和XMLTools插件以及xmlvalidation.XML中是否有效。当我使用新的XML执行固定的示例时，我再次在前面链接的图像上描述的完全相同的位置上遇到访问冲突

现在，如果我从XML中的注释中删除最后一个“o”字符（或者从注释中删除任何其他字符，或者从element6的文本中删除例如“6”，或者事实上从XML中删除任何字符，同时保持XML的有效性），示例将成功执行。这是我最初的问题。我的原始XML文件中有很多注释，结果文件的大小超过了8KB。现在，作为一种解决方法，我删除注释以避免访问冲突

我不清楚注释（或文件）长度是如何导致访问冲突的

---

整个项目可以从此下载问题在while循环中。更新如下

while(xmlReader.readNextStartElement())
{
    if(xmlReader.name() == "element1")
        ParseElement1(xmlReader);
    else if(xmlReader.name() == "element2")
        ParseElement2(xmlReader);
    else
        xmlReader.skipCurrentElement();
}

---

在您的代码中，第一个元素的类型为'element1'，然后是第一个it进程（使用first

if

），然后它们再次出现

else

，试图跳过它，这会导致问题。

啊，我不敢相信我没有看到这一点。非常感谢你！但不管我犯了什么愚蠢的错误，QXmlStreamReader不应该检查一些前提条件吗？@scopchanov，对不起。这是我的第一篇文章。在您发表评论后，我试图更新投票答案，但我收到一条消息，“记录了声誉低于15的人所投的票，但不要更改公开显示的分数。@Aleksandar，我明白了！现在试试；）

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <!--
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, 
    comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment, comment,
    comment, comment, co
    -->
    <element1>1</element1>
    <element2>2</element2>
    <element3>3</element3>
    <element4>4</element4>
    <element5>5</element5>
    <element6>6</element6>
</root>

while(xmlReader.readNextStartElement())
{
    if(xmlReader.name() == "element1")
        ParseElement1(xmlReader);
    else if(xmlReader.name() == "element2")
        ParseElement2(xmlReader);
    else
        xmlReader.skipCurrentElement();
}