string 用于国际化的 Qt tr 在 main 函数中不起作用？
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Qt tr for internationalisation does not work in main function?
提问by Passionate programmer
Qt's translation function trdoes not work in the mainfunction but works fine in a QWidget member function. Why is that?
Qt 的翻译函数tr在函数中不起作用，main但在 QWidget 成员函数中工作正常。这是为什么？
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QDialog dialog;
QString temp = tr("dadasda");//error:tr was not declared in this scope
dialog.show();
return a.exec();
}
回答by Passionate programmer
The translation function tris a static method of QObject. Since QWidgetis a subclass of QObject, tris available in methods of QWidget, but in main()you have to use QObject::trin order to use the function, as shown below.
翻译函数tr是 的静态方法QObject。由于QWidget是 的子类QObject，tr在 的方法中可用QWidget，但在main()您必须使用QObject::tr才能使用该函数，如下所示。
#include <QObject>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QDialog dialog;
QString temp = QObject::tr("dadasda");//works fine
dialog.show();
return a.exec();
}
