Use this: QString number = QStringLiteral(“%1”).arg(yourNumber, 5, 10, QLatin1Char(‘0’)); 5 here corresponds to 5 in printf(“%05d”). 10 is the radix, you can put 16 to print the number in hex.
Well, the Qt FAQ says: int main(int argc, char **argv) { QApplication app(argc, argv); QString str1 = “Test”; QByteArray ba = str1.toLocal8Bit(); const char *c_str2 = ba.data(); printf(“str2: %s”, c_str2); return app.exec(); } So perhaps you’re having other problems. How exactly doesn’t this work?
If compiled with STL compatibility, QString has a static method to convert a std::string to a QString: std::string str = “abc”; QString qstr = QString::fromStdString(str);
You can use: QString qs; // do things std::cout << qs.toStdString() << std::endl; It internally uses QString::toUtf8() function to create std::string, so it’s Unicode safe as well. Here’s reference documentation for QString.