Qt 字符串QString arg()用法总结

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

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