[solved] return a qstring of a line by lineposition of a plaintextedit

thistleknot

I'm hoping to load a text file and parse it line by line to read in [token's] kind of xml like.

I thought the anchorAt returned a QString of a line.

I thought I could use

->blockCount();

To get the # of lines of the plainTextEdit.

Apparently that is not the case.

Is there a way I can read a single line as a QString from a plainTextEdit?

Can I send it to another container/datatype and process it more easily in another data container?

Note:
I have noticed a textCursor function that has the ability to select. Is this what I should be using? I'd hate to do all that selecting myself in front of the user's eyes. I guess I could hide the form?

Update:
I think I can do it by sending the data to a qtextstream and following the steps outlined here

http://stackoverflow.com/questions/15115571/reading-a-txt-file-using-qtextstream-c

Solved
QString holderString = ui->plainTextEditLeft->toPlainText();

QTextStream in(&holderString);

//count lines
int lineCount = 1;
*QString line* = in.readLine();
while (!in.atEnd())
{
    line = in.readLine();
    lineCount++;
}

in.resetStatus();
//resets QTextStream cursor
in.seek(0);

aliks-os

Try put text from QTextEdit to QStringList and than you may take any row which you want. After processing of QStringList, you may put all together and place back to QTextEdit
@
QString plainTextEditContents = ui->textEdit->toPlainText();
QStringList lines = plainTextEditContents.split("\n");
//some processing
//...

//join all in one string
plainTextEditContents.clear();
for (int i = 0; i < lines.size(); ++i) {
plainTextEditContents += lines.at(i);
if (i!=lines.size()-1)
plainTextEditContents += "\n";
}
ui->textEdit->setText(plainTextEditContents)
@

thistleknot

thanks, I'll backupdate to that for faster access.

Karoluss96

Hi,
Thanks @aliks-os, I need the same, but in Python. I don't know how to translate function [my_name].at(i) to Python.

Could you suggest for different languange?

JonB

@Karoluss96 said in [solved] return a qstring of a line by lineposition of a plaintextedit:

translate function [my_name].at(i) to Python

Do you mean the plainTextEditContents += lines.at(i); line?

Karoluss96

Yes, I tried some versions... in friday afternoom :-P

Now it looks that:

 s=((str(query.record().value("CODE")) + ' - ' + str(query.record().value("STATUS_CONTR"))))
 a=s.split("\n")
 for i in a:
               print (a) #here I need to put 
# in the end I suppose:
 self.dlg.plainTextEdit.setPlaceholderText(s)
#but I'm not sure

JonB

@Karoluss96

 for i in a:
               print (a) #here I need to put

Since i is now a line in a, and since the original code appends each line to plainTextEditContents, did you just try plainTextEditContents += i?

Actually the effect of the whole C++ loop can be achieved in Python via:

plainTextEditContents = "\n".join(lines);

(which is just the reverse of the earlier lines = plainTextEditContents.split("\n")).

Karoluss96

@JonB I'm not sure that command "+=" is possible in Python... but maybe I've done it wrong

JonB

@Karoluss96

I'm not sure that command "+=" is possible in Python... but maybe I've done it wrong

It is perfectly legal.

But in any case, read the last bit I've added to my response: you don't need to bother with any loop at all in Python.

Karoluss96

OK, now it looks that:

 s=((str(query.record().value("CODE")) + ' - ' + str(query.record().value("STATUS_CONTR"))))
 a=s.split("\n")
 plainText = self.dlg.textEdit.toPlainText()
 plainText = "\n".join(a)
 for i in a:
      plainText += i

later I nedd to put all text (not only one record) into textEdit so:

self.dlg.plainTextEdit.setPlaceholderText(plainText)

shows only the last record, so that loop I think, is compulsory

JonB

@Karoluss96 said in [solved] return a qstring of a line by lineposition of a plaintextedit:

plainText = "\n".join(a)
for i in a:
     plainText += i

Please read what I wrote, and take the time to understand what you are doing

Actually the effect of the whole C++ loop can be achieved in Python via:

you don't need to bother with any loop at all in Python.

 plainText = self.dlg.textEdit.toPlainText()
 plainText = "\n".join(a)

I don't know what you are intending to do here. The second line completely replaces the value assigned into plainText by the first line.

Karoluss96

The difference of my point is that i don't want to replace 1st value by 2nd but put it down (next) after the first. Finally I need to see:

'wait - waiting for data
protocol - data in protocol
end_of_contr - the end of control '

etc.

This what you send, works good, but the final show must be as above write

JonB

@Karoluss96
I don't understand what you are saying. In any case since you know now that += can be used to append a string to a variable I imagine you can use that in place of = where you want to append.

Karoluss96

@JonB said in [solved] return a qstring of a line by lineposition of a plaintextedit:

In any case since you know now that += can be used to append a string to a variable I imagine you can use that in place of = where you want to append.

Changing += to = nothing present.
Now I have that:

 for i in a:
               plainText = i
 self.dlg.plainTextEdit.setPlaceholderText(plainText)

JonB

@Karoluss96 said in [solved] return a qstring of a line by lineposition of a plaintextedit:

Changing += to = nothing present.

What does this mean?

 for i in a:
               plainText = i

What do you think this achieves? Please review assigning to versus appending to a variable, this is basic Python stuff. You have all the information you need.

Karoluss96

I return to "+=".
Now I try to put from begin in this forum code:
if (i!=lines.size()-1)
plainTextEditContents += "\n";

but I don't know which python function is equivalent for C++'s .size()

JonB

@Karoluss96

First, I already showed you that "\n".join(lines) does the whole of what the for loop does, without any need to build it line by line or look at how may elements are in lines. Now you return to not using it.
If you insist on doing it your slow way, look up what C++ QList::size() returns and then use your knowledge of Python to call its method for returning the number of items in a Python list.

Sorry, but you are making a mountain out of mole hill for this and not acting properly on suggestions. I leave you to it....

jsulm

@Karoluss96 Please take a look at the code you posted and think about what you are doing:

plainText = "\n".join(a)
for i in a:
     plainText += i

Don't you think that you're doing same thing two times?

Karoluss96

Yes It true :-D , but I still I don't know how to put every line from sql question into text Edit, like I show in one of posts above

jsulm

@Karoluss96 Do you mean this:

self.dlg.plainTextEdit.setPlaceholderText(plainText)

? If so it should work already. Or do you want to set normal text (not placeholder)?