新增“保存为”菜单，优化打开逻辑

mainwindow.cpp

@@ -23,12 +23,15 @@ MainWindow::MainWindow(QWidget *parent)
 
     connect(ui->actionOpen, &QAction::triggered, this, &MainWindow::onOpenButtonClicked);
     connect(ui->actionSave, &QAction::triggered, this, &MainWindow::onSaveButtonClicked);
+    connect(ui->actionSaveAs, &QAction::triggered, this, &MainWindow::onSaveAsButtonClicked);
 
     QIcon openIcon = QApplication::style()->standardIcon(QStyle::SP_DialogOpenButton);
     QIcon saveIcon = QApplication::style()->standardIcon(QStyle::SP_DialogSaveButton);
+    QIcon saveAsIcon = QApplication::style()->standardIcon(QStyle::SP_DialogSaveButton);
 
     ui->actionOpen->setIcon(openIcon);
     ui->actionSave->setIcon(saveIcon);
+    ui->actionSave->setIcon(saveAsIcon);
 
     ui->actionOpen->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_N));
     ui->actionSave->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_S));
@@ -69,28 +72,34 @@ void MainWindow::loadTextFile(const QString& fileName)
 
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
     {
-        // 文件打开失败，处理错误
+        qDebug() << "Failed to open file:" << fileName;
         return;
     }
 
     QTextStream in(&file);
 
-    // 获取文件大小并预分配内存
+    // 自动检测并设置正确的文本编码
-    qint64 fileSize = file.size();
+    in.setAutoDetectUnicode(true);
-    QString textData;
+    in.setCodec("UTF-16LE");
-    textData.reserve(fileSize);
 
     int tableRow = 0;
     int tableCol = 0;
+    QStringList rows;
+
+    // 逐行读取文本数据
     while (!in.atEnd())
     {
         QString line = in.readLine();
-        textData += line + "\n"; // 保存所有文本数据
+        if (!line.isEmpty())
+        {
+            rows.append(line);
             tableRow++;
 
             if (tableRow == 2)
             {
-            tableCol = line.split("\t").count(); // 获取第二行的列数
+                QStringList columnValues = line.split("\t", QString::SkipEmptyParts);
+                tableCol = columnValues.count();
+            }
         }
     }
 
@@ -107,7 +116,6 @@ void MainWindow::loadTextFile(const QString& fileName)
 
     tableWidget->blockSignals(true); // 阻止信号发射
 
-    QStringList rows = textData.split("\n");
     for (int i = 0; i < tableRow; ++i)
     {
         QStringList row = rows.at(i).split("\t");
@@ -123,6 +131,7 @@ void MainWindow::loadTextFile(const QString& fileName)
             QTableWidgetItem* item = new QTableWidgetItem(row.at(j));
             tableWidget->setItem(i, j, item);
         }
+
         progressDialog->setValue(i);
         QApplication::processEvents();
         if (progressDialog->wasCanceled())
@@ -131,20 +140,67 @@ void MainWindow::loadTextFile(const QString& fileName)
             break;
         }
     }
+
     progressDialog->hide();
     tableWidget->blockSignals(false); // 恢复信号发射
 }
 
+
 void MainWindow::onOpenButtonClicked()
 {
-    QString fileName = QFileDialog::getOpenFileName(this, "Open Text File", "", "Text Files (*.txt)");
+    openFilePath = QFileDialog::getOpenFileName(this, "Open Text File", "", "Text Files (*.txt)");
-    if (!fileName.isEmpty())
+    if (!openFilePath.isEmpty())
     {
-        loadTextFile(fileName);
+        loadTextFile(openFilePath);
     }
 }
 
 void MainWindow::onSaveButtonClicked()
+{
+    if (!openFilePath.isEmpty())
+    {
+        QFile file(openFilePath);
+        if (file.open(QIODevice::WriteOnly))
+        {
+            // 写入UTF-16带有BOM的标记
+            QByteArray bom;
+            bom.append((char)0xFF);
+            bom.append((char)0xFE);
+            file.write(bom);
+
+            QTextStream out(&file);
+            out.setCodec("UTF-16LE");//Qt6 use: out.setEncoding(QStringConverter::Utf16LE);
+
+            QTableWidget* tableWidget = ui->tableWidget;
+            int rowCount = tableWidget->rowCount();
+            int columnCount = tableWidget->columnCount();
+
+            for (int i = 0; i < rowCount; ++i)
+            {
+                for (int j = 0; j < columnCount; ++j)
+                {
+                    QTableWidgetItem* item = tableWidget->item(i, j);
+                    if (item != nullptr)
+                    {
+                        QString text = item->text();
+                        out << text;
+                    }
+
+                    if (j != columnCount - 1)
+                    {
+                        out << "\t"; // 制表符分隔
+                    }
+                }
+
+                out << "\r\n"; // 换行，注意使用\r\n表示换行符
+            }
+
+            file.close();
+        }
+    }
+}
+
+void MainWindow::onSaveAsButtonClicked()
 {
     QString fileName = QFileDialog::getSaveFileName(this, "Save Text File", "", "Text Files (*.txt)");
     if (!fileName.isEmpty())
@@ -207,10 +263,10 @@ void MainWindow::dropEvent(QDropEvent *event)
         QList<QUrl> urlList = mimeData->urls();
         if (urlList.length() == 1)
         {
-            QString fileName = urlList.first().toLocalFile();
+            openFilePath = urlList.first().toLocalFile();
-            if (!fileName.isEmpty())
+            if (!openFilePath.isEmpty())
             {
-                loadTextFile(fileName);
+                loadTextFile(openFilePath);
             }
         }
     }

mainwindow.h

@@ -29,10 +29,12 @@ public:
 private slots:
     void onOpenButtonClicked();
     void onSaveButtonClicked();
+    void onSaveAsButtonClicked();
 
 private:
     Ui::MainWindow *ui;
     QProgressDialog* progressDialog;
+    QString openFilePath;
 };
 
 #endif // MAINWINDOW_H

mainwindow.ui

@@ -42,6 +42,7 @@
     </property>
     <addaction name="actionOpen"/>
     <addaction name="actionSave"/>
+    <addaction name="actionSaveAs"/>
    </widget>
    <addaction name="menuOpen"/>
   </widget>
@@ -53,12 +54,18 @@
   </action>
   <action name="actionSave">
    <property name="icon">
-    <iconset theme="Save"/>
+    <iconset theme="Save">
+     <normaloff>.</normaloff>.</iconset>
    </property>
    <property name="text">
     <string>保存</string>
    </property>
   </action>
+  <action name="actionSaveAs">
+   <property name="text">
+    <string>另存为...</string>
+   </property>
+  </action>
  </widget>
  <resources/>
  <connections/>