内存映射文件 修改以及保存文件

/**************************************************************** 
// Function : 内存映射文件进行文件同步操作的例子，转载请注明出处
// Author    : Lthis
// Create    : 2015-2-1 11:07:50 
// Checked    : Lthis 2015-2-1 
****************************************************************/

#include "stdafx.h"
#include "windows.h"
#include <iostream>
using namespace std;



int _tmain(int argc, _TCHAR* argv[])

{
    /*
        code by Lthis
    */
    HANDLE hFile = ::CreateFile(L"C:\\tmp\\a.exe",
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_ALWAYS,
        FILE_ATTRIBUTE_NORMAL,
        NULL);

    HANDLE hFileMapping = ::CreateFileMapping(hFile,
        NULL,
        PAGE_READWRITE,
        0, 0,
        NULL);

    PBYTE pbFile = NULL;
    pbFile = (PBYTE)::MapViewOfFile(hFileMapping, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
    cout << pbFile << endl;
    pbFile[0] = ‘!‘;
    pbFile[1] = ‘@‘;
    FlushViewOfFile(pbFile, 2);                //禁止写延迟，立即写入
    cout << pbFile << endl;

    ::UnmapViewOfFile(pbFile);
    ::CloseHandle(hFileMapping);
    ::CloseHandle(hFile);
    /*
        code by Lthis
    */
    getchar();
    return 0;

}