轉載自:點擊打開鏈接http://blog.163.com/qimo601@126/blog/static/1582209320134993927300/
QString 有多種方法,我慢慢總結中~~~~~~~~~~~~
1、QString::arg()//用字符串變量參數依次替代字符串中最小數值
- 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);
- style="background-color: #ffffff;"> qDebug() << status ;
結果就是:"Processing file iTest of totalTest: fileNameTest"
First, arg(i) replaces %1. Then arg(total) replaces %2. Finally, arg(fileName) replaces %3.
fieldWidth specifies the minimum amount of space that argument a shall occupy. If a requires less space than fieldWidth, it is padded to fieldWidthwith character fillChar. A positive fieldWidth produces right-aligned text. A negative fieldWidth produces left-aligned text.
2、QString::arg ( int a, int fieldWidth = 0, int base = 10, const QChar & fillChar = QLatin1Char( ' ' ) ) const
a表示輸入的值,fieldWidth表示字符寬度,base表示進制,fillChar 表示填充字符
若是字符寬度fieldWidth是正數,fillchar填在左邊,若是負數,fillchar填在右邊
16進制輸出:
- 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進制顯示,就忽略%L3的L
- //格式化輸出
- str = QString("%1").arg(521,5,10,QChar('a'))
- //str =="aa521"