QT5 eat all the white space I added in HTML

Question

0.00/5 (No votes)

See more:

Hello,

I am using QTextDocument to generate pdf from html string. However, the white space all eaten except one left.I write the html string to file and open it.The white space also disappeared.

Only if I type the & nbsp directly in html file,it's OK.
In QString, it's not.

What I have tried:

It's very strange that QDomDocument auto add "amp" before each "nbsp".So the white space place holder can't take effect.

C++

 QTextDocument text_document;
//here parse the html file , make some changes
 QDomDocument html_doc = ParseHtmlToNodes(path);
    if(html_doc.isNull())
        return;
  QFile file("changed.html");
    if (!file.open(QIODevice::WriteOnly)) {
        qDebug()<< "Cannot open file for writing: "
                  << file.errorString();
        return;
    }


    QTextStream stream_saver(&file);
    stream_saver<<html_doc.toString();
    stream_saver.setCodec("UTF8");
    stream_saver.flush();

Posted 19-Mar-17 15:06pm

Charly LEE

Updated 19-Mar-17 23:55pm

v6

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Patrice T · Answer 1 · 2017-03-19T17:05:00

Solution 1

Try

C#

myhtml.replace(" " , "&nbsp;");

or

C#

QByteArray myhtml = temp_name.toLatin1().replace(" " , "&nbsp;");

Posted 19-Mar-17 17:05pm

Patrice T

Updated 19-Mar-17 17:28pm

v2

Comments

Charly LEE 19-Mar-17 23:21pm

If I do this, the html will display "nbsp; ",but not white space

Patrice T 19-Mar-17 23:26pm

It shouldn't, something else fo wrong.

Charly LEE 20-Mar-17 0:52am

I got it, In code, I add some text to a html /, not using outside.

Charly LEE 20-Mar-17 4:36am

Hi,I update the question. new findings appended. Do you know the tricky thing in QDomDocument? I actually did what you've written, but something automatically happened when I wrote file.

Patrice T 20-Mar-17 4:54am

Can't help you on this.

Charly LEE 20-Mar-17 21:17pm

I check the html file again, all the " " become "&nbsp;",after writing to file. (in Qstring, I didn't add any "&amp",it must be added by QDomDocument inside) I don't know how to avoid this

Jochen Arndt · Answer 2 · 2017-03-19T23:55:00

According to the HTML specification multiple white spaces has to be ignored if not inside a PRE block:

Paragraphs, Lines, and Phrases[^]:
In particular, user agents should collapse input white space sequences when producing output inter-word space.

The Qt implementation just follows the standard.

Open your HTML file with a browser and you will see that it is rendered in the same way.

If you need a different rendering with multiple spaces, you have to format your HTML input accordingly (e.g. by using   non-breaking spaces or PRE blocks).