Cpp代码 
- QString i = "iTest"; // current file's number
- QString total = "totalTest"; // number of files to process
- QString fileName = "fileNameTest"; // current file's name
- QString status = QString("Processing file %1 of %2: %3")
- .arg(i).arg(total).arg(fileName);
- style="background-color: #ffffff;"> qDebug() << status ;</span>
结果就是："Processing file iTest of totalTest: fileNameTest"
First, arg(i) replaces %1. Then arg(total) replaces %2. Finally, arg(fileName) replaces %3.
2、QString::arg ( int a, int fieldWidth = 0, int base = 10, const QChar & fillChar = QLatin1Char( ' ' ) ) const
16进制输出：fieldWidth表示字符宽度，base表示进制，
Cpp代码
- QString str;
- str = QString("Decimal 63 is %1 in hexadecimal")
- .arg(63, 0, 16);
- // str == "Decimal 63 is 3f in hexadecimal"
- QLocale::setDefault(QLocale(QLocale::English, QLocale::UnitedStates));
- str = QString("%1 %L2 %L3")
- .arg(12345)
- .arg(12345)
- .arg(12345, 0, 16);
- // str == "12345 12,345 3039"
- //16进制显示，就忽略%L3的L
本文转自莫水千流博客园博客，原文链接：http://www.cnblogs.com/zhoug2020/p/3796360.html，如需转载请自行联系原作者