c++ - Decoding data from serial port (string with integers)

Question

I'm sending string from Arduino to PC using serial communication. Format of message includes char, value and space (separating data). Example message: "H123 V2 L63 V2413 I23 CRC2a". I have problem with decoding this message in Qt because when I use for example Utf-8 decoding it casting integers to chars (in a simplified way) and I receiving something like that: "H&?? j\u0002I&\u001AICL?H". Message length is not constant (different size for ex. H12 and H123) so I can't use predetermined position to casting. Do you have any idea how to decode message correctly?

Arduino code:

uint8_t H = 0, V = 0, L = 0, I = 0, CRC = 0;
String data;
void loop() {
  ++H; ++V; ++L; ++I;
  data = String("H");
  data += String(H, DEC);
  data += String(" V");
  data += String(V, DEC);
  data += String(" L");
  data += String(L, DEC);
  data += String(" I");
  data += String(I, DEC);
  CRC = CRC8(data.c_str(), strlen(data.c_str()));
  data += String(" CRC");
  data += String(CRC, HEX);
  Serial.println(data);
  delay(1000);
}

Qt code:

while(serial.isOpen())
{
  QByteArray data;

  if (serial.waitForReadyRead(1000))
  {
    data = serial.readLine();
    while (serial.waitForReadyRead(100))
    {
        data += serial.readAll();
    }
    QString response = QString::fromUtf8(data);
    qDebug() << "Data " << response << endl;
  }
  else
    qDebug() << "Timeout";
}

Answer 1

问题是您使用 UTF-8 解码，而 Arduino 仅发送 1 字节 ASCII 字符。所以fromLocal8Bit像说的那样使用 albert828

像这样：

while(serial.isOpen())
{
  QByteArray data;

  if (serial.waitForReadyRead(1000))
  {
    data = serial.readLine();
    while (serial.waitForReadyRead(100))
    {
        data += serial.readAll();
    }
    QString response = QString::fromLocal8Bit(data);
    qDebug() << "Data " << response << endl;
  }
  else
    qDebug() << "Timeout";
}