visual-studio-2010 - 涉及Visual C++ 2010中.txt文件的字符串^操作

Question

1. 我有一个 Windows 表单SearchById并且我有一个类UserRecord（用于存储用户名等凭据）（具有实例 obj）在UserRecord.h中定义。
2. 现在，当我单击SearchById表单上的Done按钮时，它应该搜索文件 userrecord.txt并将对象的内容（其 id 与文本框 UserId中输入的 id 匹配）复制到文本框tbUserName、tbAddress 和 tbPhoneNumber中。然后，从现有表单中创建一个新表单（我传递要在新表单中显示的参数（从文件中检索的参数））。
3. 问题是它们没有被显示，尽管新表单打开时使用相同的 UserId（这很好），但其余的文本框没有显示。（尽管编译很好，没有任何错误或警告）。请帮忙！

4. 代码是：

   //Project Name: UserMaintenance
   //SearchById.h
   #pragma once
   
   namespace UserMaintenance {
   
       using namespace System;
       using namespace System::ComponentModel;
       using namespace System::Collections;
       using namespace System::Windows::Forms;
       using namespace System::Data;
       using namespace System::Drawing;        
   ..
   ..
   ..
   public ref class SearchById : public System::Windows::Forms::Form
   {
   ...
   private: System::Void btnBackToMainMenu_Click(System::Object^  sender,         System::EventArgs^  e);
   private: System::Void btnDone_Click(System::Object^  sender, System::EventArgs^  e);
   };
   }
   
   //SearchById.cpp
   #include "StdAfx.h"
   #include "SearchById.h"
   #include "Main_Menu.h"
   #include "UserRecord.h"
   #include <fstream>
   
   using namespace std;
   System::Void UserMaintenance::SearchById::btnDone_Click(System::Object^  sender, System::EventArgs^  e)
   {
       int userid = System::Convert::ToInt32(this->tbUserId->Text);
       String^ username;
       String^ address;
       String^ phone;
       ifstream fusersearch;
       fusersearch.open("userrecord.txt");
       //DO EXCEPTION HANDLING HERE
       fusersearch.seekg(0,ios::beg);
       while(fusersearch.read((char*)&obj,sizeof(obj)))
       {
           if((obj.UserRecord_compareId(userid))==1)
           {
               obj.UserRecord_output(username,address,phone);
           }
       }
       this->tbUserName->Text = username;
       this->tbAddress->Text = address;
       this->tbPhoneNumber->Text = phone;
   
       SearchById^ sbi_form = gcnew SearchById();
       sbi_form->tbUserId->Text = this->tbUserId->Text;
       sbi_form->tbUserName->Text = this->tbUserName->Text;
       sbi_form->tbAddress->Text = this->tbAddress->Text;
       sbi_form->tbPhoneNumber->Text = "hello";
       sbi_form->Show();
       this->Hide();
   }
   
   //UserRecord.h
   #ifndef USERRECORD_H
   #define USERRECORD_H
   
   #include "AddRecord.h"
   #include "stdafx.h"
   
   using namespace std;
   using namespace System::Windows::Forms;
   using namespace System;
   
   class UserRecord
   {
   private:
       int user_id;
       char user_name[30];
           char user_address[40];
       char user_phone[10];
   public:
       int UserRecord_input(int,char*,char*,char*);
       void UserRecord_output(String^ %,String^ %,String^ %);
       void UserRecord_update(int);
       int UserRecord_search();
       void UserRecord_report(int);
       int UserRecord_compareId(int);
       int UserRecord_compareNAME(char*);
   
   };
   
   static UserRecord obj;
   #endif
   
   //UserRecord.cpp
   #include "stdafx.h"
   #include "UserRecord.h"
   #include "AddRecord.h"
   #include "Main_Menu.h"
   #include<fstream>
   
   #include<iostream>
   using namespace std;
   using namespace System::Windows::Forms;
   using namespace System;
   void UserRecord::UserRecord_output(String^ %name,String^ %address,String^ %phone)
   {
       name = gcnew String(this->user_name);
       address = gcnew String(this->user_address);
       phone = gcnew String(this->user_phone);
       return;
   }
   

5. 问题可能出在UserRecord.h 和 .cpp中的 void UserRecord::UserRecord_output(String^ %name,String^ %address,String^ %phone) 函数中