Tinyxml2: Reading and writing test with newline

[ajtruckle]

Hi

I have basic XML file:

<?xml version="1.0" encoding="UTF-8"?>
<Reminders>
    <W20190408>xxxx</W20190408>
    <W20190624>yyyy</W20190624>
</Reminders>

I want to be able to support multi-line for these values. What is the simplest way to cater for that with XML?

I was going to use a ¬ character and then swap it as a \r\n escape. I tried writing &#x13&X1 into the text but it ended us as literal & etc text in the file.

What is the right way?

[comargo]

What about CDATA?

<![CDATA[ Text
With new line
]]>

[ajtruckle]

Thanks for the suggestion @comargo . I found that CDATA will also take into account the whitespace before the text on each line.Since I like the content formatted nicely in the file it seemes messy with the wrapped text right over on the left edge of the file. Does that make sense?

[comargo]

The XML file is for computer, not for human. So far the pretty-printing is not the goal.

[ajtruckle]

@comargo Valid point. I guess I have in mind the way that I like my "code" presented. But I take on board what you say.

I have not actually worked with CDATA in tinyxml2 before. What is the right way to read and write it? At the moment I have:

for (RemindersList::const_iterator iterReminder = m_mapReminders.begin();
        iterReminder != m_mapReminders.end();
        ++iterReminder)
{
    CReminder rReminder = iterReminder->second;

    // Create reminder node
    XMLElement *pReminder = m_docReminders.NewElement(CT2CA(rReminder.GetKey(), CP_UTF8));
    pReminder->SetText(CT2CA(rReminder.GetReminder(), CP_UTF8));

    // Append to XML document
    pReminders->InsertEndChild(pReminder);
}

[comargo]

I didn't tried my self yet, but if you'll take a search tool for 'CDATA' keyword in xmltest.cpp file there are some blocks about it.

[ajtruckle]

I had to change it like this @comargo 👍

// Iterate the reminders
for (RemindersList::const_iterator iterReminder = m_mapReminders.begin();
        iterReminder != m_mapReminders.end();
        ++iterReminder)
{
    CReminder rReminder = iterReminder->second;

    // Create reminder node
    XMLElement *pReminder = m_docReminders.NewElement(CT2CA(rReminder.GetKey(), CP_UTF8));
    XMLText *pText = m_docReminders.NewText(CT2CA(rReminder.GetReminder(), CP_UTF8));
    pText->SetCData(true);
    pReminder->InsertEndChild(pText);

    // Append to XML document
    pReminders->InsertEndChild(pReminder);
}

However, note that tintyxml2 expects the newline constants to be \n. For my CEdit controls they have to be \r\n. So before I commit the string to / from the XML I have to swap the constants.

Is there a setting in tinyxml2 to cater for this? I am surprised I am not allowed to just use \r\n.

Please advise.

[comargo]

@ajtruckle as you can see in source (tinyxml2.cpp line 1147) - there is no settings for it... I can't tell, what is the correct behavior.

[comargo]

@ajtruckle as I see, there are no common understanding for correct behavior: https://stackoverflow.com/questions/15016004/whats-the-correct-way-to-encode-cr-lf-line-breaks-in-text-xml-values
But there is a common solution for such task: encode CR-LF sequence with pair of entities....

[comargo]

@ajtruckle Here is one more answer for question: https://stackoverflow.com/questions/2817378/does-the-xml-specification-states-that-parser-need-to-convert-n-r-to-n-always