C++ 将 int 转换为带有零填充（前导零）的 QString
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Convert an int to a QString with zero padding (leading zeroes)
提问by elcuco
I want to "stringify" a number and add zero-padding, like how printf("%05d")would add leading zeros if the number is less than 5 digits.
我想“字符串化”一个数字并添加零填充，就像printf("%05d")如果数字小于 5 位，如何添加前导零。
回答by chalup
Use this:
用这个：
QString number = QString("%1").arg(yourNumber, 5, 10, QChar('0'));
5 here corresponds to 5 in printf("%05d"). 10 is the radix, you can put 16 to print the number in hex.
这里的 5 对应于 5 in printf("%05d")。10 是基数，你可以把 16 打印成十六进制的数字。
回答by Дмитрий Гранин
QString QString::rightJustified ( int width, QChar fill = QLatin1Char( ' ' ), bool truncate = false ) const
QString QString::rightJustified ( int width, QChar fill = QLatin1Char( ' ' ), bool truncate = false ) const
int myNumber = 99;
QString result;
result = QString::number(myNumber).rightJustified(5, '0');
result is now 00099
结果现在是 00099
回答by user1767754
The Short Example:
简短示例：
int myNumber = 9;
//Arg1: the number
//Arg2: how many 0 you want?
//Arg3: The base (10 - decimal, 16 hexadecimal - if you don't understand, choose 10)
// It seems like only decimal can support negative numbers.
QString number = QString("%1").arg(myNumber, 2, 10, QChar('0'));
Output will be: 09
回答by Isaac
Try:
尝试：
QString s = s.sprintf("%08X",yournumber);
EDIT: According to the docs at http://qt-project.org/doc/qt-4.8/qstring.html#sprintf:
编辑：根据http://qt-project.org/doc/qt-4.8/qstring.html#sprintf上的文档 ：
Warning: We do not recommend using QString::sprintf() in new Qt code. Instead, consider using QTextStream or arg(), both of which support Unicode strings seamlessly and are type-safe. Here's an example that uses QTextStream:
警告：我们不建议在新的 Qt 代码中使用 QString::sprintf()。相反，请考虑使用 QTextStream 或 arg()，它们都无缝支持 Unicode 字符串并且是类型安全的。下面是一个使用 QTextStream 的例子：
QString result;
QTextStream(&result) << "pi = " << 3.14;
// result == "pi = 3.14"
Read the other docs for features missing from this method.
阅读其他文档以了解此方法中缺少的功能。
回答by Ramao Balta
I use a technique since VB 5
我使用自 VB 5 以来的技术
QString theStr=QString("0000%1").arg(theNumber).right(4);
回答by elcuco
I was trying this (which does work, but cumbersome).
我正在尝试这个（确实有效，但很麻烦）。
QString s;
s.setNum(n,base);
s = s.toUpper();
presision -= s.length();
while(presision>0){
s.prepend('0');
presision--;
}
