1、int转QString
quint8转QString
1 quint8 k = 77;
2 QString str_1;
3 str_1 = QString::number(k, 10);
4 qDebug() << str_1; // "77"
5 QString str_2 = QString("%1").arg(k);
6 qDebug() << str_2; // "77"
2、quint8转QByteArray
1 QByteArray all;
2 quint8 head = 0XFF;
3 all.append(head);
4 qDebug() << all; //"\xFF"
3、quint8转QByteArray再转quint8
1 QByteArray all;
2 quint8 head = 65;
3 all.append(head);
4 qDebug() << all; //"A" // 可以看出是ascii码的值，65对应A
5 QByteArray temp = all.mid(0, 1);
6 qDebug() << temp; //"A"
7 char* data = temp.data();
8 qDebug() << data; //A
9 quint8 i = (quint8) data[0];
10 qDebug() << i; //65
4、QByteArray转char*
1 QByteArray b("123");
2 qDebug() << b; //"123"
3 char* d = b.data();
4 qDebug() << d; //123
5、quint8转QByteArray（感觉QByteArray.toInt()等方法很不好用。。）
1 quint8 q = 65;
2 QByteArray b;
3 b.setNum(q, 10);
4 qDebug() << b; //"65"
5 qDebug() << "int:" << b.toInt() << " hex:" << b.toHex(); //int: 65 hex: "3635"
6 // int转成功了，但是hex...额，没有看懂
6、QString转char*
1 QString str("123");
2 std::string temp = str.toStdString();
3 const char* constChar = temp.c_str();
4 char* result = new char[strlen(constChar) + 1];
5 strcpy(result, constChar);
6 qDebug() << result; //123
7、quint16转char*
1 quint16 code = 9299;
2 char buff[3];
3 memcpy(buff,&code,sizeof(quint16));
4 qDebug() << buff; //S$
8、char*转quint16
1 // buff为上一点中的数据
2 quint16 res = *((quint16*)buff);
3 qDebug() << res; //9299
9、quint16转QByteArray再转quint16
1 QByteArray q;
2 quint16 code = 9299;
3 char buff[3];
4 memcpy(buff,&code,sizeof(quint16));//quint16转char*
5 qDebug() << buff; //S$
6
7 q.append(buff); //char*转为QByteArray
8 char *temp = q.data(); // QByteArray转char*
9 quint16 res = *((quint16*)temp);// char*转quint16
10 qDebug() << "size:" << q.length() << " byte:" << q << " res:" << res;//size: 2 byte: "S$" res: 9299
