qt 整理解析QByteArray,QString,unsigned char之间的恩怨情仇

            QString datastr = msg.mid(24,8);


            //QString转数字=> packetLen=str.toUInt(&ok,16);
            //QByteArray存放的就是二进制数据,注意下=> QByteArray info; int packetLen = (unsigned char)info.at(2);
            //左移(扩大)=> packetLen<<=8;
            //数字转其他进制并输出字符串=>
            //int n = 63;QByteArray::number(n); // returns "63"
            //int n = 63;QByteArray::number(n, 16); // returns "3f"
            //int n = 63;QByteArray::number(n, 16).toUpper(); // returns "3F"
            //int n = 63;QByteArray::number(n, 2); // returns "111111"
            //int n = 63;QByteArray::number(n, 8); // returns "77"
            /*
            表示值为 123456.78，则传送的数据为 N1=78H+33H N2=56H+33H N3=34H+33H N4=12H+33H
            QByteArray::number(datastr.mid(2,2).toUInt(&ok,16)-0x33);
            序号:12 34 56 78
            原始:33 CB CC 3C
            解析:00 98 99 09
            组装:09 99 98 00
            */
            bool ok;
            QString resultstr = "";
            resultstr += QByteArray::number((datastr.mid(6,2).toUInt(&ok,16)-0x33),16);//09
            resultstr += QByteArray::number((datastr.mid(4,2).toUInt(&ok,16)-0x33),16);//0999
            resultstr += QByteArray::number((datastr.mid(2,2).toUInt(&ok,16)-0x33),16);//099998

            text.append(QString("result: "+resultstr));
　　　　　　 
 

　　 QString meterNumber = "0000000100000001";

    char bcd[8];bool ok;

    for(int i=0;i<8;i++){bcd[i] = meterNumber.mid(2*i,2).toUInt(&ok,16);}

    QString te1 = QByteArray((char*)bcd,8).toHex();//te1=>0000000100000001

　　　　　QString tem = QByteArray((char*)buf_OUT,retLen).toHex();

        //buf_out   0x68,0x00,0x00,0x16

        //tem       68000016

 

//使用c整理出来

 

//info->hex data eg: 68,00,00,00,00,99,99,68,51,08,53,d3,33,cc,cc,3c,33,33,eb,16
int parsingDirectReading(unsigned char *info, char infolen)
{
    //check 0x68 0x16
    if(*(info+0)!=0x68) return -1;
    if(*(info+infolen-1)!=0x16) return -1;
    //check cs byte
    unsigned char cs = 0;
    for(char i=0;i<infolen-2;i++)cs=*(info+i)+cs;
    if(cs!=*(info+infolen-2)) return -2;

    //parse data//((tem >> 4) & 0x0F) * 10 + (tem & 0x0F);
    unsigned char result[4];
    for(char i=0;i<4;i++){
        unsigned char tem = *(info+15-i)-0x33;
        *(result+i) = ((tem >> 4) & 0x0F) * 10 + (tem & 0x0F);
    }
    return result[0]*10000 + result[1]*100 + result[2];
}

 //测试demo

            //test//QString msg = 6800000000999968510853d333cccc3c3333eb16//20个
            bool ok1;
            QString te;
            unsigned char arr01[20];
            for(int i=0;i<20;i++){
                arr01[i]=(unsigned char)msg.mid(i*2,2).toUInt(&ok1,16);
            }
            unsigned char arr02[4];
            int result = parsingDirectReading(arr01,20);
            myDebugMsg("test start===================");
            myDebugMsg("before=>"+msg);
            for(int i=0;i<20;i++){
                te += QByteArray::number(arr01[i],16);
            }
            myDebugMsg("after=>"+te);
            te = QByteArray::number(result);myDebugMsg("result=>"+te);
            myDebugMsg("test end====================");

 

 

 //其他的

/*
char buf_OUT[BUF_SIZE];
memset(buf_OUT,0,BUF_SIZE);
QByteArray -> QChar -> uchar

char *ch;//不要定义成ch[n];
QByteArray byte;
ch = byte.data();

char *ch;
QByteArray byte;
byte = QByteArray(ch);

 int *p = (int*)malloc(sizeof(int)*m);
 C语言中用malloc/free； C++里用new/delete;

*/

 

 

 

 

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