Qt 字符串QString arg()用法总结

QString 有多种方法,我慢慢总结中~~~~~~~~~~~~

 

1、QString::arg()//用字符串变量参数依次替代字符串中最小数值

 

 

 

     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);
     qDebug() << status ;

 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，

 

     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

 

 

[麻烦各位手下留情，抽空点一下，博文下面的谷歌广告呗]