Why QString not use QTextCodec::codecForLocale by default ?

[xth21]

Currently,the QString cannot display correctly multi-byte characters like Chinese.(Tested on WinXP ,Chinese Version)

To solve this problem,we must add code "QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale)" in every program .

Why Qt not use QTextCodec::codecForLocale by default ?

[rcari]

Because your program will run OK on a Chinese Windows XP, but not on a French one. This codecForCStrings thing is runtime dependent.
The real solution to your problem would be to save your source files in UTF-8 and use QString::fromUtf8(...) or even better, QObject::trUtf8("") for all your string literals so that you can easily translate your app afterwards and deploy it anywhere, even on other platforms.

[dbzhang800]

[quote author="xth21" date="1343310177"]Currently,the QString cannot display correctly multi-byte characters like Chinese.(Tested on WinXP ,Chinese Version)

To solve this problem,we must add code "QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale)" in every program .

Why Qt not use QTextCodec::codecForLocale by default ?[/quote]

As it's nearly always wrong to use following line
@
QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale());
@

in a real word and cross-platform application.