CODEWITHSUNDEEP
c++qtunicodeglobalizationnon-ascii-characters
Patrick Bangert
Patrick Bangert

Reputation: 83

Translate Unicode Literal in Qt 5.3

In a Qt 5.3 application, I have a string literal that contains non-ASCII characters (specifically German Umlauts) that will need to be translated into foreign languages. So I have two issues: (1) I have to mark that literal with tr() and (2) I have to display the string correctly on the screen for which I would seem to have to use QString::fromLatin1() or some such function.

If I do

QString s = tr("ä");

the string is marked for translation but will not display right.

If I do

QString r = QString::fromLatin1("ä");

the string will display right but will not be marked for translation.

How can I combine the two into one? And yes, my source file is saved in UTF8 encoding.

I've been searching up and down the forums and none of the hints work; mainly because most of the solutions apply to Qt 4.8 and have been removed or depreciated for Qt 5.3. Thank you for your help!!

PS: I'm developing using Visual Studio 2010 on Windows 8. According to VS2010 and Notepad++ my sources are saved in UTF8 with BOM encoding.

Upvotes: 4

Views: 2330

Answers (2)

Dmitry Sokolov
Dmitry Sokolov

Reputation: 3180

If using QString::fromLatin1("ä") you get a correct output then your source files haven't UTF-8 encoding.

When source file

printf("%x\n", QString("ä").at(0).unicode());
printf("%x\n", QString::fromLatin1("ä").at(0).unicode());

has UTF-8 encoding, then output is

e4
c3

but when Latin1 (ISO-8859-1), then

fffd
e4

e4 is the Unicode code of the letter ä (U+00E4)

Upvotes: 4

Marek R
Marek R

Reputation: 37512

Read documentation of trUtf8 (deprecated/obsolete in Qt5).
So you don't have to use this function, just set proper default codec. Add i main this line:

QTextCodec::setCodecForTr("UTF-8");

If you prefer avoid changing default codec just use trUtf8 instead of tr.

Upvotes: -1

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