MFC 文件写入读取 Flush等操作14.5.9

本文提供两个使用MFC进行文件操作的示例：一是利用CArchive类进行数据的序列化存储与读取；二是通过CFile类进行基本的文件创建、写入、读取及获取文件状态的操作。

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// MFCSerialize.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "afxwin.h"

void Store( )
{   //打开文件
    CFile file;
    file.Open( "c:\\serial.dat", 
        CFile::modeCreate|CFile::modeWrite );
    DWORD nNum  = 100;
    BYTE  nNum2 = 1;
    CHAR  szText[] = "Hello CArchive";
    //定义CArchive
    CArchive ar( &file, CArchive::store );
    //数据保存
    ar << nNum;
/*
    _AFX_INLINE CArchive& CArchive::operator<<( DWORD dw )
    { 
        if( m_lpBufCur + sizeof(DWORD) > m_lpBufMax) 
        {
            Flush();
        }
        *((DWORD*)m_lpBufCur) = dw; 
        m_lpBufCur += sizeof(DWORD); 
    
        return *this; 
    }
*/
    ar << szText;
    ar << nNum2;
    //关闭CArchive
    ar.Close( );
    //关闭文件
    file.Close( );
}

void Load( )
{   //打开文件
    CFile file;
    file.Open( "C:\\serial.dat", CFile::modeRead );
    //
    CArchive ar( &file, CArchive::load );
    
    DWORD nNum = 0;
    ar >> nNum;
    CString strText;
    ar >> strText;
    BYTE nNum2 = 0;
    ar >> nNum2;
    printf( "%d %d\n", nNum, nNum2 );
    printf( "%s\n", (LPCTSTR)strText );
    //
    ar.Close( );
    //关闭文件
    file.Close( );
}

int main(int argc, char* argv[])
{
    Store( );
    Load( );
	return 0;
}

// MFCFile.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "afxwin.h"
#include "conio.h"

void Create()
{
	CFile cFile;
	
	if(false==cFile.Open("C:\\MFC.log",CFile::modeCreate)){
	
		printf("Create file fail\n");
	}
	cFile.Close();
}
void Data(){
	CFile cFile;
	
	if(false==cFile.Open("C:\\MFC.log",CFile::modeReadWrite)){
	
		printf("Create file fail\n");
	}
	//写数据
	try{
		char szText[100]="Hello Cfile";
		cFile.Write(szText,strlen(szText));
		//把指针移到文件开头 必须要做的
		cFile.Seek(0,CFile::begin);
		//读取文件
		char szBuf[100]={0};
		cFile.Read(szBuf,100);
		printf("%s\n",szBuf);
	}
	catch(CFileException e){
		
	}
	catch(...){
	
	}
	//读数据

	cFile.Close();
}
void Status(){
	CFile cFile;
	CFileStatus cFileStatus;
	CFile::GetStatus("C:\\MFC.log",cFileStatus);
	CString m_ctime=cFileStatus.m_ctime.Format("%Y-%Mm-%d %H:%M:%S");
	
	printf("SIZE:%d",cFileStatus.m_size);
	printf("path:%s",cFileStatus.m_szFullName);
	printf("time:%s",(LPCSTR)m_ctime);
	
	if(false==cFile.Open("C:\\MFC.log",CFile::modeReadWrite)){
	
		printf("Create file fail\n");
	}
}

int main(int argc, char* argv[])
{
	//Create();
	Data();
	getch();
	return 0;
}