[Qt-interest] number formatting in output textstream

[André Somers]

[Qt 4.5.2 on Windows XP-64]

 

Hi,

 

I am trying to output data to a textfile. The file contains both integers
and floating point numbers. Due to the program reading in the data, I have
specific requirements to the formatting of these numbers. Specifically, I
need the integers be formatted without anything added (just the number, no
thousands separators) but the floats formatted as defined in the locale
(here usually a comma is used for the decimals). 

 

I tried the following approach:

 

QTextStream s(&file); // file is a QFile, opened in writing mode

QLocale l = QLocale::system();  //get system locale

l.setNumberOptions(QLocale::OmitGroupSeparator); // I don’t want to use
separators, but are ‘group-separators’ the same as thousands-separators?

s.setLocale(l);

 

s << integer1 << “ “ << integer2 << “ “ << float1 << endl; // output a line
of data

 

This does not work as expected. I had hoped the OmitGroupSeparator flag
would stop the outputting of thousandsseparators, but I still get them when
the integers are bigger than 1000. Am I overlooking something? Is there a
way to get around this?

If I don’t set the locale explicitly, I don’t get the thousands separators,
but then I end up with a point as the decimal separator. That doesn’t work
for me, as the target application (which I can not change) *does* use the
locale for the formatting of floating point numbers. QLocale only seems to
support reading the characters used for the separators, but not setting
them. 

 

André

 

 

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