QString 与 QByteArray笔记

程序中在于外设打交到是常常会用到读硬件显示到控件，或是读控件写到硬件的情况，操作的最多的是字节流，所以肯定会用到QString 和QByteArray，下面测试一些常用的转换；

#include <QApplication>

#include <QDebug>

int main(int argv, char *argc[])

{

    QApplication app(argv, argc);

    //将16进制串转化成16进制数值组

    //QStirng hex -> QByteArray hex

    QString str1("12345f");

    QByteArray data1 = str1.toLocal8Bit();

    QByteArray data2 = QByteArray::fromHex(data1);

    //将10进制串转化成16进制数值组

    //QStirng int -> QByteArray hex

    bool ok;

    QByteArray data3, data4;

    QString str2 = "65534";

    uint value = str2.toUInt(&ok, 10);

    str2 = str2.setNum(value, 16);

    data3 = str2.toLocal8Bit();

    data4 = QByteArray::fromHex(data3);

    //将十六进制数组转换成十六进制串（Hex）串

    //QByteArray hex -> QStirng hex

    QString str3;

    str3 = data2.toHex().toUpper();

    //将十六进制数组转换成十进制串int串

    //QByteArray hex -> QStirng int

    QString str4;

    value = (0xff00 & (data4.at(0) << 8))  | (0xff & data4.at(1));

    str4.setNum(value);

    return app.exec();

}

运行结果