更改Qt中的区域设置 [英] Changing locale in Qt

问题描述

我试图改变locale使用QLocale和setDefault函数，但似乎它不工作。这里是使用C本地化库和QLocale更改locale的示例。对于C本地化库似乎它的工作，但对于QLocale似乎setDefault函数调用被忽略。

I tried to change locale using QLocale and setDefault function but it seems that it doesn't work. Here is example of changing locale using C localization library and QLocale. For C localization library it seems that it works, but for QLocale it seems that setDefault function call is ignored.

QLocale curLocale(QLocale("pl_PL"));
QLocale::setDefault(curLocale);
QDate date = QDate::currentDate();
QString dateString = date.toString();
// prints "Fri Nov 9 2012" but that was not expected
std::cout << dateString.toStdString() << std::endl;
// prints "en_US", but shouldn't it be "pl_PL"?
std::cout << QLocale::system().name().toStdString() << std::endl;

std::setlocale(LC_ALL, "pl_PL");
// prints "pl_PL"
std::cout << std::setlocale(LC_ALL, 0) << std::endl;
std::time_t currentTime;
std::time(&currentTime);
std::tm* timeinfo = std::localtime(&currentTime);
char charArray[40];
std::strftime(charArray, 40, "%a %b %d %Y", timeinfo);
// prints "pi lis 09 2012" and that's cool
std::cout << charArray << std::endl;

如何在Qt中更改正确的区域设置，以便影响程序？

How to change properly locale in Qt so it affects the program?

推荐答案

QLocale :: setDefault（）不更改系统区域设置。它改变了使用默认构造函数创建的 QLocale 对象。

QLocale::setDefault() does not change the system locale. It changes what QLocale object created with default constructor is.

想象一下，系统区域设置只能通过系统控制面板/偏好。

Supposedly, system locale can only be changed via system control panel/preferences by the user. If you want to format something that is not in the system locale, you need to specifically do that with a locale object.

此代码：

QLocale curLocale(QLocale("pl_PL"));
QLocale::setDefault(curLocale);
QDate date = QDate::currentDate();
QString dateString = QLocale().toString(date);
qDebug() << dateString;
qDebug() << QLocale().name();

打印此：

"piątek, 9 listopada 2012" 
"pl_PL" 

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