Data conversion problem in Qt development serial communication software: when reading_ Qbytearray to string; When sending_ Data format; Int to hexadecimal format string; Intercept characters in string

Using Qt In the process of serial port program development , In addition to the function of serial communication , Data conversion is also a troublesome thing , This article mainly introduces the problem of data conversion in serial communication , About the function realization, you can find relevant cases by searching online .

After completing the initialization of serial port and other functions , Realize data reading and conversion .

Refer to the post ：Qt Summary 15 ：QByteArray Detailed explanation ;Qt Simple application of hexadecimal , Hexadecimal addition ;QString And QByteArray The method of mutual conversion ;

The data received from the serial port looks like ：“0010101821....” Of 16 Hexadecimal number , Serial port returns QByteArray Data format , Convert to QString, Then by intercepting some bits in the data , according to 16 Convert hexadecimal format to 10 Use .

• QByteArray turn QString

   static QString serialBuffer;

    QByteArray serialBufferTmp=m_serialPort->readAll();

    serialBuffer=serialBuffer.append(serialBufferTmp);

• Cut off the 8 Behind you 4 Bit 16 Hexadecimal number , and QString turn float

QString strValue=serialBuffer.mid(8,4);
float floatValue=strValue.toInt(nullptr,16)

• Decimal system int turn 16 Base format string

Usually we go from Qt Used in the developed interface QLineEdit The input is decimal , For serial port processing, it needs to be converted to 16 Base format , Then it can be processed into a format that can be parsed by the serial port , For example, the decimal system 50 Convert to 16 It's binary “32”, The code is as follows ：

  int Num=dec2HexInputEdit->text().toInt();

  QString hexString=QString::number(Num,16)

• 16 Hexadecimal number addition

For reference here Qt Simple application of hexadecimal , Hexadecimal addition , It first converts numbers into 10 Base number , Add and convert to QString

QString hexAri(QString str, int addend)
{
    
	bool ok;
	int dec = str.toUInt(&ok, 16);
	QString tmp = QString("%1").arg(dec + addend, 5, 16, QLatin1Char('0');
	return tmp;
	}

• string turn ByteAr
  Reference resources QString And QByteArray The method of mutual conversion ;

QByteArray SettingArray=Setting.toLatin1();