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