串口发送Hex数组

void MainWindow::String2Hex(QString str, QByteArray &senddata)
{
    int hexdata,lowhexdata;
    int hexdatalen = ;
    int len = str.length();
    senddata.resize(len/);
    char lstr,hstr;
    for(int i=; 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 == ) || (lowhexdata == ))
            break;
        else
            hexdata = hexdata*+lowhexdata;
        i++;
        senddata[hexdatalen] = (char)hexdata;
        hexdatalen++;
    }
    senddata.resize(hexdatalen);
}

char MainWindow::ConvertHexChar(char ch)
{
    if((ch >= '') && (ch <= ''))
        return ch-0x30;
    else if((ch >= 'A') && (ch <= 'F'))
        return ch-'A'+;
    else if((ch >= 'a') && (ch <= 'f'))
        return ch-'a'+;
    else return (-);
}