16进制字符串转QByteArray，char转16进制字符串

直接上代码，看代码你们就懂了

1、16进制QString转QByteArray

QString str = "01 a5 1e 02";
QByteArray tmpBy;
StringToHex(str, tmpBy);

void MainWindow::StringToHex(QString str, QByteArray &senddata)
{
    int hexdata,lowhexdata;
    int hexdatalen = 0;
    int len = str.length();
    senddata.resize(len/2);
    char lstr,hstr;
    for(int i=0; i<len; )
    {
        //char lstr,
        hstr=str[i].toLatin1();
        if(hstr == ' ')
        {
            i++;
            continue;
        }
        i++;
        if(i >= len)
            break;
        lstr = str[i].toLatin1();
        hexdata = ConvertHexChar(hstr);
        lowhexdata = ConvertHexChar(lstr);
        if((hexdata == 16) || (lowhexdata == 16))
            break;
        else
            hexdata = hexdata*16+lowhexdata;
        i++;
        senddata[hexdatalen] = (char)hexdata;
        hexdatalen++;
    }
    senddata.resize(hexdatalen);
}

char MainWindow::ConvertHexChar(char ch)
{
    if((ch >= '0') && (ch <= '9'))
        return ch-0x30;
    else if((ch >= 'A') && (ch <= 'F'))
        return ch-'A'+10;
    else if((ch >= 'a') && (ch <= 'f'))
        return ch-'a'+10;
    else return ch-ch;//不在0-f范围内的会发送成0
}

2、qint8(signed char)转16进制字符串

    QDataStream out(&requestData,QIODevice::ReadWrite);    //将字节数组读入
    QString strReceive;
    int index = 0;
    while(!out.atEnd())
    {
        qint8 outChar = 0;
        out>>outChar;   //每字节填充一次，直到结束
        //十六进制的转换
        QString str = QString("%1").arg(outChar & 0xFF,2,16,QLatin1Char('0'));
        strReceive.append(str);
    }

3、这块我主要是用在串口通信这里了，看自己实际情况吧