修改了一些bug

TcpClient.pro.user

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 6.0.2, 2023-01-09T16:16:43. -->
+<!-- Written by QtCreator 6.0.2, 2023-01-09T18:43:00. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>

login.cpp

@@ -8,6 +8,7 @@ Login::Login(QWidget *parent) :
     /**********ui_init**********/
     ui->setupUi(this);
     this->setWindowIcon(QIcon(":/icon.png"));
+    this->setTabOrder(ui->lineEdit_username,ui->lineEdit_password);
     this->setWindowFlags(Qt::FramelessWindowHint); //无边框
     this->setAttribute(Qt::WA_TranslucentBackground);
     new_closebutton(ui->close_btn,":/close.png", QSize(30, 30));

mainwidget.cpp

@@ -87,6 +87,7 @@ void MainWidget::on_save_btn_clicked()
                 stream << str;
                 //关闭文件
                 file.close();
+                QMessageBox::information(this,"保存聊天记录","保存成功！");
             }
         }
         else
@@ -100,6 +101,7 @@ void MainWidget::on_save_btn_clicked()
                 stream << str;
                 //关闭文件
                 file.close();
+                QMessageBox::information(this,"保存聊天记录","保存成功！");
             }
         }
     }
@@ -130,9 +132,19 @@ void MainWidget::on_send_btn_clicked()
         QString data_text = insert + text.mid(n,-1);
         QString text_self = QString("私发给%1:%2").arg(to_user).arg(text.mid(n));
         qDebug() << text_self;
-        if(to_user == username)
+        int index = 0;
+        for (index = 0; index < ui->name_list->count(); index++)
+        {
+            if(username ==ui->name_list->item(index)->text())
             {
                 QMessageBox::critical(this,"错误","不能自己给自己发送消息！");
+                return;
+            }
+        }
+        if(index >= ui->name_list->count())
+        {
+            QMessageBox::critical(this,"错误","未找到指定用户！");
+            return;
         }
         else
         {