How to use the Qt class library

Function name

    //int转字节数组
    static QByteArray intToByte(int i);
    static QByteArray intToByteRec(int i);

    //字节数组转int
    static int byteToInt(const QByteArray &data);
    static int byteToIntRec(const QByteArray &data);
    static quint32 byteToUInt(const QByteArray &data);
    static quint32 byteToUIntRec(const QByteArray &data);

    //ushort转字节数组
    static QByteArray ushortToByte(ushort i);
    static QByteArray ushortToByteRec(ushort i);

    //字节数组转ushort
    static int byteToUShort(const QByteArray &data);
    static int byteToUShortRec(const QByteArray &data);

function body

QByteArray QUIHelper::intToByte(int i)
{
    QByteArray result;
    result.resize(4);
    result[3] = (uchar)(0x000000ff & i);
    result[2] = (uchar)((0x0000ff00 & i) >> 8);
    result[1] = (uchar)((0x00ff0000 & i) >> 16);
    result[0] = (uchar)((0xff000000 & i) >> 24);
    return result;
}

QByteArray QUIHelper::intToByteRec(int i)
{
    QByteArray result;
    result.resize(4);
    result[0] = (uchar)(0x000000ff & i);
    result[1] = (uchar)((0x0000ff00 & i) >> 8);
    result[2] = (uchar)((0x00ff0000 & i) >> 16);
    result[3] = (uchar)((0xff000000 & i) >> 24);
    return result;
}

int QUIHelper::byteToInt(const QByteArray &data)
{
    int i = data.at(3) & 0x000000ff;
    i |= ((data.at(2) << 8) & 0x0000ff00);
    i |= ((data.at(1) << 16) & 0x00ff0000);
    i |= ((data.at(0) << 24) & 0xff000000);
    return i;
}

int QUIHelper::byteToIntRec(const QByteArray &data)
{
    int i = data.at(0) & 0x000000ff;
    i |= ((data.at(1) << 8) & 0x0000ff00);
    i |= ((data.at(2) << 16) & 0x00ff0000);
    i |= ((data.at(3) << 24) & 0xff000000);
    return i;
}

quint32 QUIHelper::byteToUInt(const QByteArray &data)
{
    quint32 i = data.at(3) & 0x000000ff;
    i |= ((data.at(2) << 8) & 0x0000ff00);
    i |= ((data.at(1) << 16) & 0x00ff0000);
    i |= ((data.at(0) << 24) & 0xff000000);
    return i;
}

quint32 QUIHelper::byteToUIntRec(const QByteArray &data)
{
    quint32 i = data.at(0) & 0x000000ff;
    i |= ((data.at(1) << 8) & 0x0000ff00);
    i |= ((data.at(2) << 16) & 0x00ff0000);
    i |= ((data.at(3) << 24) & 0xff000000);
    return i;
}

QByteArray QUIHelper::ushortToByte(ushort i)
{
    QByteArray result;
    result.resize(2);
    result[1] = (uchar)(0x000000ff & i);
    result[0] = (uchar)((0x0000ff00 & i) >> 8);
    return result;
}

QByteArray QUIHelper::ushortToByteRec(ushort i)
{
    QByteArray result;
    result.resize(2);
    result[0] = (uchar)(0x000000ff & i);
    result[1] = (uchar)((0x0000ff00 & i) >> 8);
    return result;
}

int QUIHelper::byteToUShort(const QByteArray &data)
{
    int i = data.at(1) & 0x000000FF;
    i |= ((data.at(0) << 8) & 0x0000FF00);

    if (i >= 32768) {
        i = i - 65536;
    }

    return i;
}

int QUIHelper::byteToUShortRec(const QByteArray &data)
{
    int i = data.at(0) & 0x000000FF;
    i |= ((data.at(1) << 8) & 0x0000FF00);

    if (i >= 32768) {
        i = i - 65536;
    }

    return i;
}

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