保存和读取历史通信记录功能

crc.cpp

@@ -1,6 +1,6 @@
 #include "crc.h"
 
-quint16 calculateCrc(const QByteArray &data)
+quint16 CalculateCrc(const QByteArray &data)
 {
     quint16 crc = 0xFFFF;  // MODBUS初始值
     const quint16 polynomial = 0xA001;  // MODBUS多项式（0x8005的反转）
@@ -22,3 +22,33 @@ quint16 calculateCrc(const QByteArray &data)
     }
     return crc;
 }
+
+bool CrcCheck(const QByteArray &data)
+{
+    //首先对接收报文的长度进行检验
+    if (data.size() < 3)
+    {
+        return false;
+    }
+    //对接收的报文进行CRC校验
+    QByteArray payload = data.left(data.length() - 2);
+
+    //分离接收值的crc校验位
+    quint8 receivedCrcLow = static_cast<quint8>(data.at(data.length() - 2));
+    quint8 receivedCrcHigh = static_cast<quint8>(data.at(data.length() - 1));
+
+    //计算返回的报文的crc
+    quint16 crc = CalculateCrc(payload);
+    quint8 calcCrcLow = crc & 0xFF;
+    quint8 calcCrcHigh = (crc >> 8) & 0xFF;
+
+    //比较计算的crc值和接收到的crc值是否一致
+    if(calcCrcLow == receivedCrcLow && calcCrcHigh == receivedCrcHigh)
+    {
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}

crc.h

@@ -5,4 +5,5 @@
 #include <QByteArray>
 #include <QtGlobal>
 
-quint16 calculateCrc(const QByteArray &data);
+quint16 CalculateCrc(const QByteArray &data);
+bool CrcCheck(const QByteArray &data);

modbus.pro

@@ -15,9 +15,11 @@ TEMPLATE = app
 
 SOURCES += main.cpp\
         widget.cpp \
-    crc.cpp
+    crc.cpp \
+    mymodbus.cpp
 
 HEADERS  += widget.h \
-    crc.h
+    crc.h \
+    mymodbus.h
 
 FORMS    += widget.ui

modbus.pro.user

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.0.3, 2025-07-25T12:36:51. -->
+<!-- Written by QtCreator 4.0.3, 2025-07-26T12:31:36. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>

mymodbus.cpp

@@ -0,0 +1,200 @@
+#include "mymodbus.h"
+
+
+MyModbus::MyModbus()
+{
+}
+
+void MyModbus::Set(quint16 stationAddress, quint16 functionCode, quint16 startAdress, quint16 length)
+{
+    this->stationAddress = stationAddress;
+    this->functionCode = functionCode;
+    this->startAdress = startAdress;
+    this->length = length;
+
+}
+
+void MyModbus::ReadColiAndReg()
+{
+    sendCommand.clear();
+    sendCommand.append(stationAddress%256);
+    sendCommand.append(functionCode%256);
+    sendCommand.append(startAdress/256);
+    sendCommand.append(startAdress%256);
+    sendCommand.append(length/256);
+    sendCommand.append(length%256);
+    quint16 temp = CalculateCrc(sendCommand);
+    sendCommand.append(temp%256);
+    sendCommand.append(temp/256);
+}
+
+void MyModbus::WriteCoil(QVector<bool> &coils)
+{
+    quint16 coilCount = coils.size();
+    int byteCount = (coilCount + 7) / 8;
+
+    sendCommand.clear();
+    sendCommand.append(stationAddress%256);
+    sendCommand.append(0x0f);
+    sendCommand.append(startAdress/256);
+    sendCommand.append(startAdress%256);
+    sendCommand.append(length/256);
+    sendCommand.append(length%256);
+    sendCommand.append(byteCount);
+    for (int i = 0; i < byteCount; ++i)
+    {
+        quint8 byte = 0;
+        for (int j = 0; j < 8; ++j)
+        {
+            int bitIndex = i * 8 + j;
+            if (bitIndex < coils.size() && coils[bitIndex])
+                byte |= (1 << j);
+        }
+        sendCommand.append(static_cast<char>(byte));
+    }
+
+    quint16 temp = CalculateCrc(sendCommand);  //计算crc
+    sendCommand.append(temp%256);  //加入计算的crc值
+    sendCommand.append(temp/256);
+}
+
+void MyModbus::WriteRegister(QVector<quint16> &values)
+{
+    sendCommand.clear();
+    sendCommand.append(stationAddress%256);
+    sendCommand.append(0x10);
+    sendCommand.append(startAdress/256);
+    sendCommand.append(startAdress%256);
+    sendCommand.append(length/256);
+    sendCommand.append(length%256);
+    sendCommand.append(static_cast<char>(values.size() * 2));
+    for (quint16 v : values)
+    {
+        sendCommand.append(static_cast<char>((v >> 8) & 0xFF));
+        sendCommand.append(static_cast<char>(v & 0xFF));
+    }
+    quint16 temp = CalculateCrc(sendCommand);  //计算crc
+    sendCommand.append(temp%256);  //加入计算的crc值
+    sendCommand.append(temp/256);
+}
+
+QByteArray MyModbus::SendCommand()
+{
+    return sendCommand;
+}
+
+QByteArray MyModbus::Receive(const QByteArray &revMessage)
+{
+    receive.clear();
+    if (CrcCheck(revMessage))
+    {
+        this->receive = revMessage;
+    }
+    return receive;
+}
+
+int MyModbus::ErrorCheck()
+{
+    if ((receive.at(1) & 0x80) == 0x80)
+    {
+        // MODBUS异常响应结构：地址 | 功能码+0x80 | 异常码 | CRC
+        quint8 exCode = receive.at(2);
+        return exCode;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+int MyModbus::ErrorCheck(QByteArray rev)
+{
+    if ((rev.at(1) & 0x80) == 0x80)
+    {
+        // MODBUS异常响应结构：地址 | 功能码+0x80 | 异常码 | CRC
+        quint8 exCode = rev.at(2);
+        return exCode;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+QVector<bool> MyModbus::AnalReadCoil()
+{
+    quint8 byteCount = static_cast<quint8>(receive[2]);
+    QVector<bool> coil;
+
+    for (int byteIndex = 0; byteIndex < byteCount; byteIndex++)
+    {
+        quint8 byteValue = static_cast<quint8>(receive[3 + byteIndex]);
+
+        // 解析每个字节的8个位
+        for (int bitIndex = 0; bitIndex < 8; bitIndex++)
+        {
+            int coilIndex = byteIndex * 8 + bitIndex;
+            if (coilIndex < length)
+            {
+                bool state = byteValue & (1 << bitIndex);
+                coil.append(state);
+            }
+        }
+    }
+    return coil;
+}
+
+QVector<quint16> MyModbus::AnalReadReg()
+{
+    int byteCount = receive.at(2);
+    QByteArray data = receive.mid(3, byteCount);
+
+    QVector<quint16> registers;
+    for (int i = 0; i < data.size(); i += 2)
+    {
+        quint16 value = (static_cast<quint8>(data[i]) << 8) | static_cast<quint8>(data[i+1]);
+        registers.append(value);
+    }
+
+    return registers;
+}
+
+QVector<bool> MyModbus::AnalReadCoil(QByteArray rev)
+{
+    quint8 byteCount = static_cast<quint8>(rev[2]);
+    QVector<bool> coil;
+
+    for (int byteIndex = 0; byteIndex < byteCount; byteIndex++)
+    {
+        quint8 byteValue = static_cast<quint8>(rev[3 + byteIndex]);
+
+        // 解析每个字节的8个位
+        for (int bitIndex = 0; bitIndex < 8; bitIndex++)
+        {
+            int coilIndex = byteIndex * 8 + bitIndex;
+            if (coilIndex < length)
+            {
+                bool state = byteValue & (1 << bitIndex);
+                coil.append(state);
+            }
+        }
+    }
+    return coil;
+}
+
+QVector<quint16> MyModbus::AnalReadReg(QByteArray rev)
+{
+    int byteCount = rev.at(2);
+    QByteArray data = rev.mid(3, byteCount);
+
+    QVector<quint16> registers;
+    for (int i = 0; i < data.size(); i += 2)
+    {
+        quint16 value = (static_cast<quint8>(data[i]) << 8) | static_cast<quint8>(data[i+1]);
+        registers.append(value);
+    }
+
+    return registers;
+}
+
+

mymodbus.h

@@ -0,0 +1,35 @@
+#ifndef MYMODBUS_H
+#define MYMODBUS_H
+
+#include <QByteArray>
+#include <QVector>
+#include <QString>
+#include "crc.h"
+
+class MyModbus
+{
+private:
+    quint16 stationAddress;
+    quint16 functionCode;
+    quint16 startAdress;
+    quint16 length;
+    QByteArray sendCommand;
+    QByteArray receive;
+
+public:
+    MyModbus();
+    void Set(quint16 stationAddress,quint16 functionCode,quint16 startAdress,quint16 length);
+    void ReadColiAndReg();
+    void WriteCoil(QVector<bool> &coils);
+    void WriteRegister(QVector<quint16> &values);
+    QByteArray SendCommand();
+    QByteArray Receive(const QByteArray &revMessage);
+    int ErrorCheck();
+    int ErrorCheck(QByteArray rev);
+    QVector<bool> AnalReadCoil();
+    QVector<quint16> AnalReadReg();
+    QVector<bool> AnalReadCoil(QByteArray rev);
+    QVector<quint16> AnalReadReg(QByteArray rev);
+};
+
+#endif // MYMODBUS_H

widget.cpp

@@ -8,7 +8,10 @@
 #include <QVector>
 #include <QMessageBox>
 #include <synchapi.h>
+#include <QFile>
+#include <QFileDialog>
 #include "crc.h"
+#include "mymodbus.h"
 
 Widget::Widget(QWidget *parent) :
     QWidget(parent),
@@ -16,11 +19,28 @@ Widget::Widget(QWidget *parent) :
 {
     ui->setupUi(this);
     serialPort = new QSerialPort(this);
+    modbus = new MyModbus();
 
     connect(serialPort,&QSerialPort::readyRead,this,&Widget::on_SerialData_ReadyToRead);
     QObject::connect(&timer, &QTimer::timeout, [&]{
+        if (comCount < 3)
+        {
+            ui->textEdit_2->append("通信超时，重新发送中");
+
+            serialPort->write(modbus->SendCommand());
+            Sleep(1000);
+            timer.isActive();
+            timer.start(1000);
+
+            comCount ++;
+        }
+        else
+        {
         QMessageBox::warning(this, "提示", "等待响应超时，请检查设备状态。");
+        ui->btn_read->setEnabled(1);
+        ui->pushWrite->setEnabled(1);
         timer.stop();
+        }
     });
 
     ui->comboBox_baudRate->setCurrentIndex(3);
@@ -71,6 +91,7 @@ void Widget::on_btnConnect_clicked()
         if (serialPort->open(QIODevice::ReadWrite))
         {
             qDebug() << "Serial open success";
+            ui->textEdit_2->append("串口连接成功");
             ui->btnConnect->setText("断开");
             ui->btn_read->setEnabled(1);
             ui->pushWrite->setEnabled(1);
@@ -78,15 +99,18 @@ void Widget::on_btnConnect_clicked()
         else
         {
             qDebug() << "error";
+            QMessageBox::warning(this, "提示", "串口连接失败，请检查串口参数配置");
         }
     }
     else
     {
+        delete modbus;
         serialPort->close();
         ui->btn_read->setEnabled(0);
         ui->pushWrite->setEnabled(0);
         qDebug() << "Serial close";
         ui->btnConnect->setText("连接");
+        ui->textEdit_2->append("串口断开");
     }
 
 }
@@ -117,43 +141,23 @@ void Widget::on_pushWrite_clicked()
         coils.append(ch == '1');
     }
 
-    quint16 coilCount = coils.size();
-
-    QByteArray SendCommand;  //要发送的报文
-    SendCommand.append(ui->comboBox_stationAddress->currentText().toInt()%256);  //加入站地址
-    SendCommand.append(0x0f);
-    SendCommand.append(ui->lineEdit_stratAddress->text().toInt()/256);  //加入起始地址
-    SendCommand.append(ui->lineEdit_stratAddress->text().toInt()%256);
-    SendCommand.append(ui->lineEdit_length->text().toInt()/256);        //加入长度
-    SendCommand.append(ui->lineEdit_length->text().toInt()%256);
-
-    int byteCount = (coilCount + 7) / 8;
-
-    SendCommand.append(byteCount);      //字节数
-    for (int i = 0; i < byteCount; ++i)
-    {
-        quint8 byte = 0;
-        for (int j = 0; j < 8; ++j)
-        {
-            int bitIndex = i * 8 + j;
-            if (bitIndex < coils.size() && coils[bitIndex])
-                byte |= (1 << j);
-        }
-        SendCommand.append(static_cast<char>(byte));
-    }
-
+    quint16 stationAddress = ui->comboBox_stationAddress->currentText().toInt();
+    quint16 functionCode = 0x0f;
+    quint16 stratAddress = ui->lineEdit_stratAddress->text().toInt();
+    quint16 length = ui->lineEdit_length->text().toInt();
 
-    quint16 temp = calculateCrc(SendCommand);  //计算crc
+    modbus->Set(stationAddress,functionCode,stratAddress,length);
+    modbus->WriteCoil(coils);
 
-    SendCommand.append(temp%256);  //加入计算的crc值
-    SendCommand.append(temp/256);
-
-    ui->textEdit_2->append("发送报文"+SendCommand.toHex().toUpper());
-    serialPort->write(SendCommand);
+    ui->textEdit_2->append("发送报文"+modbus->SendCommand().toHex().toUpper());
+    serialPort->write(modbus->SendCommand());
+    ui->btn_read->setEnabled(0);
+    ui->pushWrite->setEnabled(0);
 
-    Sleep(100);
+    comCount = 0;
+    Sleep(200);
     timer.isActive();
-    timer.start(2000);   // 2 s 后触发超时
+    timer.start(1000);   // 1 s 后触发超时
 
     qDebug() << "SenOk" <<sendData;
     break;
@@ -182,31 +186,23 @@ void Widget::on_pushWrite_clicked()
             values.append(v);
         }
 
-        QByteArray SendCommand;  //要发送的报文
-        SendCommand.append(ui->comboBox_stationAddress->currentText().toInt()%256);  //加入站地址
-        SendCommand.append(0x10);
-        SendCommand.append(ui->lineEdit_stratAddress->text().toInt()/256);  //加入起始地址
-        SendCommand.append(ui->lineEdit_stratAddress->text().toInt()%256);
-        SendCommand.append(ui->lineEdit_length->text().toInt()/256);        //加入长度
-        SendCommand.append(ui->lineEdit_length->text().toInt()%256);
-        SendCommand.append(static_cast<char>(values.size() * 2));
-        for (quint16 v : values)
-        {
-            SendCommand.append(static_cast<char>((v >> 8) & 0xFF));
-            SendCommand.append(static_cast<char>(v & 0xFF));
-        }
-
-        quint16 temp = calculateCrc(SendCommand);  //计算crc
+        quint16 stationAddress = ui->comboBox_stationAddress->currentText().toInt();
+        quint16 functionCode = 0x0f;
+        quint16 stratAddress = ui->lineEdit_stratAddress->text().toInt();
+        quint16 length = ui->lineEdit_length->text().toInt();
 
-        SendCommand.append(temp%256);  //加入计算的crc值
-        SendCommand.append(temp/256);
+        modbus->Set(stationAddress,functionCode,stratAddress,length);
+        modbus->WriteRegister(values);  //要发送的报文
 
-        ui->textEdit_2->append("发送报文"+SendCommand.toHex().toUpper());
-        serialPort->write(SendCommand);
+        ui->textEdit_2->append("发送报文"+modbus->SendCommand().toHex().toUpper());
+        serialPort->write(modbus->SendCommand());
+        ui->btn_read->setEnabled(0);
+        ui->pushWrite->setEnabled(0);
 
-        Sleep(100);
+        comCount = 0;
+        Sleep(200);
         timer.isActive();
-        timer.start(2000);   // 2 s 后触发超时
+        timer.start(1000);   // 1 s 后触发超时
 
         qDebug() << "SenOk" <<sendData;
         break;
@@ -223,117 +219,73 @@ void Widget::on_pushWrite_clicked()
 //处理回复报文
 void Widget::on_SerialData_ReadyToRead()
 {
-    timer.stop();
-
-    QByteArray revMessage = serialPort->readAll();
+    QByteArray revMessage = modbus->Receive(serialPort->readAll());
+    if (!revMessage.isEmpty())
+    {
+        ui->btn_read->setEnabled(1);
+        ui->pushWrite->setEnabled(1);
+        timer.stop();
+    }
+    else
+    {
+        return;
+    }
     QString hexData = revMessage.toHex().toUpper();
     qDebug() << hexData;
     ui->textEdit_2->append("接收报文"+hexData);
 
-    //首先对接收报文的长度进行检验
-    if (revMessage.size() < 3) {
-        QMessageBox::warning(this, "警告", "无效的响应格式");
-        qDebug() << "响应报文过短，长度 =" << revMessage.size();
-        return;
-    }
-
-    //对接收的报文进行CRC校验
-    QByteArray payload = revMessage.left(revMessage.length() - 2);
+    qDebug() << "接收成功";
+    int exCode = modbus->ErrorCheck(revMessage);
+    if (exCode)
+    {
+        QString errorMsg;
+        switch (exCode)
+        {
+        case 0x01: errorMsg = "非法功能码"; break;
+        case 0x02: errorMsg = "非法数据地址"; break;
+        case 0x03: errorMsg = "非法数据值"; break;
+        case 0x04: errorMsg = "从站设备故障"; break;
+        default: errorMsg = "未知异常"; break;
+        }
 
-    //分离接收值的crc校验位
-    quint8 receivedCrcLow = static_cast<quint8>(revMessage.at(revMessage.length() - 2));
-    quint8 receivedCrcHigh = static_cast<quint8>(revMessage.at(revMessage.length() - 1));
+        QMessageBox::warning(this, "异常响应",
+                             QString("异常\n错误码: 0x%1 (%2)")
+                             .arg(QString::number(exCode, 16).toUpper().rightJustified(2, '0'))
+                             .arg(errorMsg));
 
-    //计算返回的报文的crc
-    quint16 crc = calculateCrc(payload);
-    quint8 calcCrcLow = crc & 0xFF;
-    quint8 calcCrcHigh = (crc >> 8) & 0xFF;
+        return;
+    }
 
-    //比较计算的crc值和接收到的crc值是否一致
-    if(calcCrcLow == receivedCrcLow && calcCrcHigh == receivedCrcHigh)
+    switch (ui->comboBox_gongnengma->currentIndex())
     {
-        qDebug() << "接收成功";
-        if ((revMessage.at(1) & 0x80) == 0x80) {
-            // MODBUS异常响应结构：地址 | 功能码+0x80 | 异常码 | CRC
-            quint8 originalFunctionCode = revMessage.at(1) & 0x7F; // 去掉最高位
-            quint8 exCode = revMessage.at(2);
-
-            QString errorMsg;
-            switch (exCode) {
-                case 0x01: errorMsg = "非法功能码"; break;
-                case 0x02: errorMsg = "非法数据地址"; break;
-                case 0x03: errorMsg = "非法数据值"; break;
-                case 0x04: errorMsg = "从站设备故障"; break;
-                case 0x05: errorMsg = "确认"; break;
-                case 0x06: errorMsg = "从站设备忙"; break;
-                case 0x07: errorMsg = "负确认"; break;
-                case 0x08: errorMsg = "存储奇偶错误"; break;
-                default: errorMsg = "未知异常"; break;
-            }
-
-            QMessageBox::warning(this, "异常响应",
-                QString("功能码 0x%1 异常\n错误码: 0x%2 (%3)")
-                    .arg(QString::number(originalFunctionCode, 16).toUpper())
-                    .arg(QString::number(exCode, 16).toUpper().rightJustified(2, '0'))
-                    .arg(errorMsg));
-
-            return;
-        }
+    //解析读线圈的返回报文
+    case 0:
+    {
+        QVector<bool> coil = modbus->AnalReadCoil(revMessage);
 
-        switch (ui->comboBox_gongnengma->currentIndex())
+        ui->textEdit->append("线圈状态：");
+        for (int i = 0; i < coil.size(); i++)
         {
-        //解析读线圈的返回报文
-        case 0:
-        {
-            quint8 byteCount = static_cast<quint8>(revMessage[2]);
-
-            for (int byteIndex = 0; byteIndex < byteCount; byteIndex++)
-            {
-                quint8 byteValue = static_cast<quint8>(revMessage[3 + byteIndex]);
-
-                // 解析每个字节的8个位
-                for (int bitIndex = 0; bitIndex < 8; bitIndex++)
-                {
-                    int coilIndex = byteIndex * 8 + bitIndex;
-                    if (coilIndex < ui->lineEdit_length->text().toInt())
-                    {
-                        bool state = byteValue & (1 << bitIndex);
-                        qDebug() << coilIndex <<" " << state;
-                        ui->textEdit->append("线圈"+QString::number(coilIndex+1)+":"+QString::number(state));
-                    }
-                }
-            }
-            break;
+            bool state = coil.at(i);
+            ui->textEdit->append("线圈"+QString::number(i+1)+":"+QString::number(state));
         }
+
+        break;
+    }
         //解析读寄存器的返回报文
-        case 1:
-        {
-            if (revMessage.size() >= 5 && revMessage.at(1) == 0x03)
+    case 1:
+    {
+            QVector<quint16> registers = modbus->AnalReadReg(revMessage);
+
+            ui->textEdit->append("寄存器的值：");
+            for (int i = 0; i < registers.size(); i++)
             {
-                int byteCount = revMessage.at(2);
-                QByteArray data = revMessage.mid(3, byteCount);
-
-                QVector<quint16> registers;
-                for (int i = 0; i < data.size(); i += 2)
-                {
-                    quint16 value = (static_cast<quint8>(data[i]) << 8) | static_cast<quint8>(data[i+1]);
-                    registers.append(value);
-                }
-
-                for (int i = 0; i < registers.size(); i++)
-                {
-                    qDebug() << "Register value:" << registers.at(i);
-                    ui->textEdit->append("寄存器"+QString::number(i)+":"+QString::number(registers.at(i)));
-                }
+                ui->textEdit->append("寄存器"+QString::number(i+1)+":"+QString::number(registers.at(i)));
             }
-            break;
-        }
+        break;
 
-        }
     }
-    else
-    {
-        qDebug() << "接收失败";
+
     }
 }
 
@@ -346,32 +298,88 @@ void Widget::on_btn_read_clicked()
         QMessageBox::warning(this, "提示", "请将“操作”切换为读线圈或读寄存器");
         return;
     }
-    QByteArray SendCommand;  //要发送的报文
-    SendCommand.append(ui->comboBox_stationAddress->currentText().toInt()%256);  //加入站地址
+    quint16 stationAddress = ui->comboBox_stationAddress->currentText().toInt();
+    quint16 functionCode;
+    quint16 stratAddress = ui->lineEdit_stratAddress->text().toInt();
+    quint16 length = ui->lineEdit_length->text().toInt();
+    QByteArray SendCommand;
+
     if (ui->comboBox_gongnengma->currentIndex() == 0)  //读线圈
     {
-        SendCommand.append(0x01);
+        functionCode = 0x01;
     }
     else if(ui->comboBox_gongnengma->currentIndex() == 1)  //读寄存器
     {
-        SendCommand.append(0x03);
+        functionCode = 0x03;
     }
 
-    SendCommand.append(ui->lineEdit_stratAddress->text().toInt()/256);  //加入起始地址
-    SendCommand.append(ui->lineEdit_stratAddress->text().toInt()%256);
-    SendCommand.append(ui->lineEdit_length->text().toInt()/256);        //加入长度
-    SendCommand.append(ui->lineEdit_length->text().toInt()%256);
+    modbus->Set(stationAddress,functionCode,stratAddress,length);
+    modbus->ReadColiAndReg();
+
+    serialPort->write(modbus->SendCommand());  //发送报文
+    ui->textEdit_2->append("发送报文"+modbus->SendCommand().toHex().toUpper());
+    ui->btn_read->setEnabled(0);
+    ui->pushWrite->setEnabled(0);
+
+    comCount = 0;
+    Sleep(200);
+    timer.isActive();
+    timer.start(1000);   // 1 s 后触发超时
+}
+
+void Widget::on_pushButton_clicked()
+{
+    QString fileName = QFileDialog::getSaveFileName(
+            this,
+            "保存文本",
+            QDir::homePath() + "/note.txt",
+            "文本文件 (*.txt);;所有文件 (*.*)");
+
+        if (fileName.isEmpty())
+            return;
 
-    quint16 temp = calculateCrc(SendCommand);  //计算crc
+        QFile file(fileName);
+        if (!file.open(QIODevice::Append | QIODevice::Text))   //
+            {
+                QMessageBox::warning(this, "错误", "无法打开文件");
+                return;
+            }
 
-    SendCommand.append(temp%256);  //加入计算的crc值
-    SendCommand.append(temp/256);
+            // 每次追加前换行
+            if (file.size() > 0)                    // 文件非空
+                file.write("\n");                   // 先换行，再写内容
 
-    qDebug() << SendCommand.toHex();
-    ui->textEdit_2->append("发送报文"+SendCommand.toHex().toUpper());
-    serialPort->write(SendCommand);  //发送报文
+            QTextStream out(&file);
+            out.setCodec("UTF-8");
+            out << ui->textEdit_2->toPlainText();     // 追加写入
+            file.close();
+}
 
-    Sleep(100);
-    timer.isActive();
-    timer.start(2000);   // 2 s 后触发超时
+void Widget::on_pushButton_2_clicked()
+{
+    QString fileName = QFileDialog::getOpenFileName(
+            this,
+            "打开文本",
+            QDir::homePath(),
+            "文本文件 (*.txt);;所有文件 (*.*)");
+
+        if (fileName.isEmpty())
+            return;
+
+        QFile file(fileName);
+        if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
+        {
+            QMessageBox::warning(this, "错误", "无法读取文件");
+            return;
+        }
+
+        QTextStream in(&file);
+        in.setCodec("UTF-8");
+        ui->textEdit_2->setPlainText(in.readAll());
+        file.close();
+}
+
+void Widget::on_pushButton_3_clicked()
+{
+    ui->textEdit_2->clear();
 }

widget.h

@@ -4,6 +4,7 @@
 #include <QSerialPort>
 #include <QWidget>
 #include <QTimer>
+#include "mymodbus.h"
 
 namespace Ui {
 class Widget;
@@ -26,10 +27,18 @@ private slots:
 
     void on_btn_read_clicked();
 
+    void on_pushButton_clicked();
+
+    void on_pushButton_2_clicked();
+
+    void on_pushButton_3_clicked();
+
 private:
     Ui::Widget *ui;
     QSerialPort *serialPort;
+    MyModbus *modbus;
     QTimer timer;
+    int comCount;
 };
 
 #endif // WIDGET_H

widget.ui

@@ -13,219 +13,11 @@
   <property name="windowTitle">
    <string>Widget</string>
   </property>
-  <widget class="QLabel" name="label">
-   <property name="geometry">
-    <rect>
-     <x>31</x>
-     <y>31</y>
-     <width>30</width>
-     <height>16</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>串口</string>
-   </property>
-  </widget>
-  <widget class="QComboBox" name="comboBox_serialNum">
-   <property name="geometry">
-    <rect>
-     <x>68</x>
-     <y>31</y>
-     <width>87</width>
-     <height>21</height>
-    </rect>
-   </property>
-  </widget>
-  <widget class="QLabel" name="label_2">
-   <property name="geometry">
-    <rect>
-     <x>162</x>
-     <y>31</y>
-     <width>45</width>
-     <height>16</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>波特率</string>
-   </property>
-  </widget>
-  <widget class="QLabel" name="label_3">
-   <property name="geometry">
-    <rect>
-     <x>308</x>
-     <y>31</y>
-     <width>45</width>
-     <height>16</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>数据位</string>
-   </property>
-  </widget>
-  <widget class="QComboBox" name="comboBox_baudRate">
-   <property name="geometry">
-    <rect>
-     <x>214</x>
-     <y>31</y>
-     <width>87</width>
-     <height>21</height>
-    </rect>
-   </property>
-   <item>
-    <property name="text">
-     <string>1200</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>2400</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>4800</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>9600</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>19200</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>38400</string>
-    </property>
-   </item>
-  </widget>
-  <widget class="QComboBox" name="comboBox_dataBit">
-   <property name="geometry">
-    <rect>
-     <x>360</x>
-     <y>31</y>
-     <width>61</width>
-     <height>21</height>
-    </rect>
-   </property>
-   <item>
-    <property name="text">
-     <string>5</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>6</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>7</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>8</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>NONE</string>
-    </property>
-   </item>
-  </widget>
-  <widget class="QPushButton" name="btnConnect">
-   <property name="geometry">
-    <rect>
-     <x>340</x>
-     <y>60</y>
-     <width>93</width>
-     <height>28</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>连接</string>
-   </property>
-  </widget>
-  <widget class="QComboBox" name="comboBox_xiaoyan">
-   <property name="geometry">
-    <rect>
-     <x>80</x>
-     <y>70</y>
-     <width>91</width>
-     <height>21</height>
-    </rect>
-   </property>
-   <item>
-    <property name="text">
-     <string>无校验(N)</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>奇校验(O)</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>偶校验(E)</string>
-    </property>
-   </item>
-  </widget>
-  <widget class="QLabel" name="label_7">
-   <property name="geometry">
-    <rect>
-     <x>30</x>
-     <y>70</y>
-     <width>51</width>
-     <height>21</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>校验位</string>
-   </property>
-  </widget>
-  <widget class="QLabel" name="label_8">
-   <property name="geometry">
-    <rect>
-     <x>198</x>
-     <y>70</y>
-     <width>45</width>
-     <height>16</height>
-    </rect>
-   </property>
-   <property name="text">
-    <string>停止位</string>
-   </property>
-  </widget>
-  <widget class="QComboBox" name="comboBox_stopBit">
-   <property name="geometry">
-    <rect>
-     <x>250</x>
-     <y>70</y>
-     <width>61</width>
-     <height>21</height>
-    </rect>
-   </property>
-   <item>
-    <property name="text">
-     <string>1</string>
-    </property>
-   </item>
-   <item>
-    <property name="text">
-     <string>2</string>
-    </property>
-   </item>
-  </widget>
   <widget class="QLineEdit" name="lineEdit">
    <property name="geometry">
     <rect>
-     <x>330</x>
-     <y>410</y>
+     <x>340</x>
+     <y>430</y>
      <width>301</width>
      <height>31</height>
     </rect>
@@ -234,8 +26,8 @@
   <widget class="QPushButton" name="pushWrite">
    <property name="geometry">
     <rect>
-     <x>330</x>
-     <y>460</y>
+     <x>350</x>
+     <y>470</y>
      <width>93</width>
      <height>28</height>
     </rect>
@@ -248,7 +40,7 @@
    <property name="geometry">
     <rect>
      <x>40</x>
-     <y>230</y>
+     <y>250</y>
      <width>251</width>
      <height>211</height>
     </rect>
@@ -257,8 +49,8 @@
   <widget class="QPushButton" name="btn_read">
    <property name="geometry">
     <rect>
-     <x>90</x>
-     <y>460</y>
+     <x>110</x>
+     <y>470</y>
      <width>93</width>
      <height>28</height>
     </rect>
@@ -374,7 +166,7 @@
     <item>
      <widget class="QLineEdit" name="lineEdit_stratAddress">
       <property name="text">
-       <string>00</string>
+       <string>256</string>
       </property>
      </widget>
     </item>
@@ -388,7 +180,7 @@
     <item>
      <widget class="QLineEdit" name="lineEdit_length">
       <property name="text">
-       <string>00</string>
+       <string>1</string>
       </property>
      </widget>
     </item>
@@ -397,8 +189,8 @@
   <widget class="QLabel" name="label_13">
    <property name="geometry">
     <rect>
-     <x>330</x>
-     <y>300</y>
+     <x>340</x>
+     <y>330</y>
      <width>311</width>
      <height>101</height>
     </rect>
@@ -410,15 +202,206 @@
 相邻寄存器的值之间用英文&quot;,&quot;分离。</string>
    </property>
   </widget>
-  <widget class="QTextEdit" name="textEdit_2">
+  <widget class="QWidget" name="">
+   <property name="geometry">
+    <rect>
+     <x>40</x>
+     <y>30</y>
+     <width>378</width>
+     <height>62</height>
+    </rect>
+   </property>
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <layout class="QHBoxLayout" name="horizontalLayout_2">
+      <item>
+       <widget class="QLabel" name="label">
+        <property name="text">
+         <string>串口</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBox_serialNum"/>
+      </item>
+      <item>
+       <widget class="QLabel" name="label_2">
+        <property name="text">
+         <string>波特率</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBox_baudRate">
+        <item>
+         <property name="text">
+          <string>1200</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>2400</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>4800</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>9600</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>19200</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>38400</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+      <item>
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>数据位</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBox_dataBit">
+        <item>
+         <property name="text">
+          <string>5</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>6</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>7</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>8</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>NONE</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <layout class="QHBoxLayout" name="horizontalLayout_3">
+      <item>
+       <widget class="QLabel" name="label_7">
+        <property name="text">
+         <string>校验位</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBox_xiaoyan">
+        <item>
+         <property name="text">
+          <string>无校验(N)</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>奇校验(O)</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>偶校验(E)</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+      <item>
+       <widget class="QLabel" name="label_8">
+        <property name="text">
+         <string>停止位</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBox_stopBit">
+        <item>
+         <property name="text">
+          <string>1</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>2</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="btnConnect">
+        <property name="text">
+         <string>连接</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QWidget" name="">
    <property name="geometry">
     <rect>
      <x>40</x>
      <y>150</y>
      <width>671</width>
-     <height>61</height>
+     <height>91</height>
     </rect>
    </property>
+   <layout class="QHBoxLayout" name="horizontalLayout_4">
+    <item>
+     <widget class="QTextEdit" name="textEdit_2"/>
+    </item>
+    <item>
+     <layout class="QVBoxLayout" name="verticalLayout_2">
+      <item>
+       <widget class="QPushButton" name="pushButton_3">
+        <property name="text">
+         <string>清空收发信息</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="pushButton">
+        <property name="text">
+         <string>保存收发信息</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QPushButton" name="pushButton_2">
+        <property name="text">
+         <string>读取历史收发信息</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+   </layout>
   </widget>
  </widget>
  <layoutdefault spacing="6" margin="11"/>