add save config file error reminder

config_mgr.cpp

@@ -3,7 +3,7 @@
 #include <QJsonDocument>
 #include <QJsonArray>
 #include <QJsonObject>
-
+#include <QMessageBox>
 #include "data_config.h"
 #include "vibrationdata.h"
 #include "tachometer_data.h"
@@ -18,7 +18,7 @@ ConfigMgr *ConfigMgr::instance = nullptr;
 ConfigMgr::~ConfigMgr() {
 }
 
-void ConfigMgr::Save(QString & file_path) {
+int ConfigMgr::Save(QString & file_path) {
     QJsonObject doc_obj;
     int slot = 0;
     QJsonArray card_type;
@@ -590,8 +590,14 @@ void ConfigMgr::Save(QString & file_path) {
     jsonDoc.setObject(doc_obj);
     QFile file(file_path);
     file.open(QIODevice::WriteOnly);
-    file.write(jsonDoc.toJson());
+    int ret = file.write(jsonDoc.toJson());
     file.close();
+    if(ret != 0){
+        return -1;
+    }else{
+        return 0;
+    }
+
 }
 
 void ConfigMgr::Load(QString filename) {

config_mgr.h

@@ -122,7 +122,7 @@ class ConfigMgr {
         return instance;
     }
     ~ConfigMgr();
-    void Save(QString & file_path);
+    int Save(QString & file_path);
     void Load(QString filename);
     std::shared_ptr<CardBase> GetSlotPtr(int slot);//1-15
     void AddCard(std::shared_ptr<CardBase> ptr);

mainwindow.cpp

@@ -640,10 +640,16 @@ void MainWindow::on_pushButton_save_clicked() {
         if(filepath == "")
             return;
         file_name = filepath + "\\"+file_name +".json";
-        ConfigMgr::Instance()->Save(file_name);
+        int ret = ConfigMgr::Instance()->Save(file_name);
+        if(ret != 0){
+            QMessageBox::warning(this, QStringLiteral("提示"), QStringLiteral("文件保存失败！请检查文件权限！"));
+        }
         tsi_config_file = file_name;
     }else {
-        ConfigMgr::Instance()->Save(tsi_config_file);
+        int ret = ConfigMgr::Instance()->Save(tsi_config_file);
+        if(ret != 0){
+            QMessageBox::warning(this, QStringLiteral("提示"), QStringLiteral("文件保存失败！请检查文件权限！"));
+        }
     }
 
     return;