Why is Cyrillic displayed incorrectly in the interface?

Question

Qt

Hello Toaster!
The problem is that when adding Cyrillic to the interface using code, for example like this (in QComboBox):

ui->userList->addItem("Стандартный пользователь");
ui->userList->addItem(tr("Стандартный пользователь"));
ui->userList->addItem(trUtf8("Стандартный пользователь"));

in all three cases it displays black diamonds with questions. Latin is displayed normally.

Answer 1

Because Qt expects unicode strings.
QTextCodec *codec = QTextCodec::codecForName("Windows-1251");
ui->userList->addItem(codec->toUnicode("Standard User"));
Try this code, it should work.

Answer 2

Do not do it this way:

ui->userList->addItem(tr("Стандартный пользователь"));
ui->userList->addItem(trUtf8("Стандартный пользователь"));

tr and trUtf8 are usually used to localize the application, write in English, then include "translation" and Qt will substitute everything.
Try adding items to the combobox in the form builder.