总体思路:
1.读取所有数据(readAll())
QByteArray readbuf = serial->readAll();
2.查找标志位(QString中使用indexOf(“GNGGA”)——因为我需要GNGGA下经纬度及海拔高度,因此我识别数据头“GNGGA”,数据尾“GNGSA”)
QString tmpreadbuf = QString(readbuf); //放入QString中
int positionstart = tmpreadbuf.indexOf("$GNGGA"); //查找数据头起始位(这里是$的位置,因为查找字符串只表示字符串第一位的位置)
int positionend = tmpreadbuf.indexOf("$GNGSA"); //查找数据尾(这里是$的位置)
3.截取片段(QString中使用mid()截取,第一个参数:数据起始位;第二个参数:截取长度)
QString substring = tmpreadbuf.mid(positionstart,positionend-positionstart);
4.开始解析具体数据
完整头 文件Recv.hpp(时间紧迫,用的旧上位机,可能有未删除部分,不影响结果)
#ifndef RECV_HPP
#define RECV_HPP
#include <QMainWindow>
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>
#include <QString>
#include <QDebug>
#include <QMutex>
#include <QFile>
#include <QTimer>
#include <QDateTime>
namespace Ui {
class Recv;
}
class Recv : public QMainWindow
{
Q_OBJECT
public:
explicit Recv(QWidget *parent = nullptr);
~Recv();
char convertHex2Char(char ch);
private slots:
void onOpenserialbuttonClicked();
void readData();
private:
Ui::Recv *ui;
QSerialPort *serial;
QTimer* m_serialhnltm;
};
#endif // RECV_HPP
完整Recv.cpp文件(旧上位机改版,部分未删除,不影响结果,时间紧迫,后期看看能不能注释,精编代码)
#include "recv.hpp"
#include "ui_recv.h"
#include <QString.h>
#include <QMutex>
#include <string>
#include <iostream>
QMutex gmux;
int validlength = 0;
unsigned char *buf;
QString hexToString(unsigned char *in, int len)
{
int i;
unsigned char inChar,hi,lo;
QString s;
for (i=0; i<len; i++)
{
inChar = in[i];
hi = (inChar & 0xF0) >> 4;
if (hi > 9)
hi = 'A' + (hi - 0x0A);
else
hi += 0x30;
s.append(hi);
lo = inChar & 0x0F;
if (lo > 9)
lo = 'A' + (lo - 0x0A);
else
lo += 0x30;
s.append(lo);
s.append(0x20);
}
return s;
}
Recv::Recv(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::Recv)
{
ui->setupUi(this);
ui->comboBox_uartselect->addItem("COM1");
ui->comboBox_uartselect->addItem("COM2");
ui->comboBox_uartselect->addItem("COM3");
ui->comboBox_uartbaud->addItem("9600");
ui->comboBox_uartbaud->addItem("19200");
ui->comboBox_uartbaud->addItem("38400");
ui->comboBox_uartbaud->addItem("115200");
ui->comboBox_uartbaud->addItem("921600");
ui->comboBox_uartbaud->setCurrentIndex(2);
QObject::connect(ui->pushButton_uartopen,SIGNAL(clicked()),this,SLOT(onOpenserialbuttonClicked()));
m_serialhnltm = new QTimer(this);
//QObject::connect(m_serialhnltm,SIGNAL(timeout()),this,SLOT(handletimeout()));
}
Recv::~Recv()
{
delete ui;
}
char Recv::convertHex2Char(char ch)
{
if((ch>='0')&& (ch<='9')){
return ch-0x30;
}else if((ch>='A') && (ch<='F')){
return ch-'A'+10;
}else if((ch>='a') && (ch<='f')){
return ch-'a'+10;
}else{
return (-1);
}
}
void Recv::onOpenserialbuttonClicked()
{
if(ui->pushButton_uartopen->text() == tr("打开串口"))
{
serial = new QSerialPort;
serial->setPortName(ui->comboBox_uartselect->currentText());
int ret = serial->open(QIODevice::ReadWrite);
serial->setBaudRate(ui->comboBox_uartbaud->currentText().toInt());
serial->setDataBits(QSerialPort::Data8);
serial->setParity(QSerialPort::NoParity);
serial->setStopBits(QSerialPort::OneStop);
serial->setFlowControl(QSerialPort::NoFlowControl);
ui->comboBox_uartselect->setEnabled(false);
ui->comboBox_uartbaud->setEnabled(false);
ui->pushButton_uartopen->setText(tr("关闭串口"));
QObject::connect(serial,&QSerialPort::readyRead,this,&Recv::readData);
m_serialhnltm->start(10);
}
else
{
serial->clear();
serial->close();
serial->deleteLater();
//恢复设置使能
ui->comboBox_uartselect->setEnabled(true);
ui->comboBox_uartbaud->setEnabled(true);
ui->pushButton_uartopen->setText(tr("打开串口"));
m_serialhnltm->stop();
}
}
void Recv::readData()
{
QByteArray readbuf = serial->readAll();
QString disp_string_latitude;
QString disp_string_NS;
QString disp_string_longitude;
QString disp_string_WE;
QString disp_string_altitude;
QString disp_string_unit;
QString tmpreadbuf = QString(readbuf);
int positionstart = tmpreadbuf.indexOf("$GNGGA");
//qDebug()<<"recv: "<<positionstart;
int positionend = tmpreadbuf.indexOf("$GNGSA");
QString substring = tmpreadbuf.mid(positionstart,positionend-positionstart);
QStringList strList = substring.split(",");
//qDebug()<<"size: "<<strList.size();
int i = 0;
if(strList[i]!=NULL)
{
qDebug()<<"strList: "<<strList;
disp_string_latitude = QString("%1").arg(strList[2]);
/*解析纬度及南北半球*/
QString disp_string1 = disp_string_latitude.mid(0,2);
QString disp_string2 = disp_string_latitude.mid(2);
double data1=disp_string1.toDouble();
double data2=disp_string2.toDouble();
double data = data1+data2/60;
QString disp_string = QString::number(data,'f',6);
disp_string = QString("纬度是: %1").arg(disp_string);//在string类型中写其他内容
//qDebug()<<"recv: "<<disp_string;
disp_string_NS = QString("纬度半球: %1").arg(strList[3]);
/*解析东西半球*/
disp_string_longitude = QString("%1").arg(strList[4]);
QString disp_string3 = disp_string_longitude.mid(0,3);
QString disp_string4 = disp_string_longitude.mid(3);
double data3=disp_string3.toDouble();
double data4=disp_string4.toDouble();
double data5 = data3+data4/60;
QString disp_string5 = QString::number(data5,'f',6);
disp_string5 = QString("经度是: %1").arg(disp_string5);
//qDebug()<<"recv: "<<disp_string4;
disp_string_WE = QString("经度半球: %1").arg(strList[5]);
/*海拔高度解析*/
disp_string_altitude = QString("海拔高度: %1").arg(strList[9]);
disp_string_unit = QString("海拔高度单位: %1").arg(strList[10]);
ui->textBrowser_recv->append(disp_string);
ui->textBrowser_recv->append(disp_string_NS);
ui->textBrowser_recv->append(disp_string5);
ui->textBrowser_recv->append(disp_string_WE);
ui->textBrowser_recv->append(disp_string_altitude);
ui->textBrowser_recv->append(disp_string_unit);
}
readbuf.clear();
}
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