[Qt]用QString得到16进制，2进制等的字符串并自动填0

函数原型

QString	arg(int a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(uint a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(long a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(ulong a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(qlonglong a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(qulonglong a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(short a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(ushort a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(QChar a, int fieldWidth = 0, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(char a, int fieldWidth = 0, QChar fillChar = QLatin1Char( ' ' )) const
QString	arg(double a, int fieldWidth = 0, char format = 'g', int precision = -1, QChar fillChar = QLatin1Char( ' ' )) const

使用实例

typedef unsigned char      uint8;
QString strShowHex,strShowBin;
uint8 val = 0xfc;
//16进制
strShowHex = QString("0x%1").arg(int(val), 4, 16, QLatin1Char('0'));
//显示结果为： 0x00fc

//2进制
strShowBin = QString("%1 b").arg(int(val), 8, 2, QLatin1Char('0'));
//显示结果为： 11111100 b