feat(mainwindow): 优化串口数据接收处理

- 增加 bufferReceived 缓冲区，用于存储接收到的数据
-采用循环处理，直到找到所有完整的数据行
- 修复了原代码中未处理不完整数据行的问题
- 优化了数据日志的更新逻辑

Author: AndroidCoderPeng

mainwindow.cpp

@@ -450,9 +450,14 @@ void MainWindow::updateConnectState(const bool connected) const {
 }
 
 void MainWindow::onReceivedData() {
-  const QByteArray bytes = serialPort.readAll();
-  if (bytes != nullptr) {
-    updateComMessageLog(bytes, "收");
+  bufferReceived += serialPort.readAll();
+  while (true) {
+    int endIndex = bufferReceived.indexOf('\n');
+    if (endIndex == -1)
+      break;
+
+    updateComMessageLog(bufferReceived, "收");
+    bufferReceived.remove(0, endIndex + 1);
   }
 }
 

mainwindow.hpp

@@ -34,6 +34,7 @@ class MainWindow : public QMainWindow {
   QSqlQuery *sqlQuery;
   QTableWidgetItem *commandItem = nullptr;
   QTableWidgetItem *remarkItem = nullptr;
+  QByteArray bufferReceived;
   QList<ComMessage> history;
   QTimer *timer = nullptr;