Use MFC's CFile file classes and CArchive serialization classes for binary file read and write operations

A programming case Introduction
This case is based on the console project, create a specialized demo class CDemo, realize the binary file read and write serialization operation, the specific code is as follows:
1 CDemo class Definition:
Class CDemo
{
Public
void CreateFile ();
CDemo ();
Virtual ~cdemo ();

void Serialize (CArchive &ar);
void WriteFile ();
void ReadFile ();
void Initlize ();//initialization
Private
Presentation data to read and write:

Base type Data
int nyear;
Char Chmonth;
Short Shday;
float fsalary;

String data
CString M_strusername;
CString M_strpassword;

FILE-related data:
CString m_strfilename;//filename
};
2 CDemo class interface implementation definition:

Cdemo::cdemo ()
{
Read-Write file name
M_strfilename = "Data.dat";

}

Cdemo::~cdemo ()
{

}
File read and write serialization function
void Cdemo::serialize (CArchive &ar)
{
if (AR. IsStoring ())
{
Write variable data to file
ar<<nyear;
ar<<chmonth;
ar<<shday;
ar<<fsalary;
ar<<m_strusername;
ar<<m_strpassword;
}
Else
{
Read the contents of the file and save it to a variable:
ar>>nyear;
ar>>chmonth;
ar>>shday;
ar>>fsalary;
ar>>m_strusername;
ar>>m_strpassword;

}
}


Data Write file
void Cdemo::writefile ()
{
CFile file;
if (file. Open (M_strfilename, Cfile::modewrite, NULL))//Create disk File and open
{
CArchive ar (&file, carchive::store);//Create a file serialization object based on the open file
Serialize (AR); Write file content

Close object after end
Ar. Close ();
File. Close ();
}
}


Reading data from a file
void Cdemo::readfile ()
{
CFile file;

if (file. Open (M_strfilename, Cfile::moderead, NULL))//opening disk File
{
CArchive ar (&file, carchive::load);//Create a file serialization object based on the open file
Serialize (AR); Read the contents of the file

Close object after end
Ar. Close ();