WIN32硬盘文件映射到内存CreateFileMapping

//内存申请物理页
HANDLE CreateFileMapping(
HANDLE hFile, //与文件句柄关联
LPSECURITY_ATTRIBUTES lpFileMappingAttributes, //NULL
DWORD flProtect, //访问保护类型 
DWORD dwMaximumSizeHigh, //申请内存的大小的高32位
DWORD dwMaximumSizeLow, //申请内存大小的低32位
LPCTSTR lpName //内核对象名称，如果别的进程也用这块内存就需要用到的这个名称
);

 

//虚拟内存与物理页关联映射
LPVOID MapViewOfFile(
HANDLE hFileMappingObject, //内存申请的对象句柄
DWORD dwDesiredAccess, // 访问保护模式 范围小于等于 CreateFileMapping的
DWORD dwFileOffsetHigh, 
DWORD dwFileOffsetLow,
DWORD dwNumberOfBytesToMap // 指定要映射的文件的字节数。如果dwNumberOfBytesToMap为零，则映射整个文件。
 );

 

 

#include <stdio.h>
#include <windows.h>


int main()
{
    //创建打开文件
    HANDLE cFile = CreateFile("D:\\filterBufFile.txt",
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL, OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL,
        NULL);
    //内存申请物理页
    HANDLE hMapFile = CreateFileMapping(cFile, NULL, PAGE_READWRITE, 0, 0, "共享映射");
    //和虚拟地址映射
    LPTSTR lpBuff = (LPTSTR)MapViewOfFile(hMapFile, FILE_MAP_WRITE, 0, 0, 0);

    //*(PDWORD)lpBuff = 0x12345678;

    //getchar();
    //读文件
    printf("%p\n", lpBuff);
    printf("%x\n", *(PDWORD)lpBuff);
    printf("%x\n", *((PDWORD)lpBuff+1));

    //写文件
    *(PDWORD)lpBuff = 0x41414141;
    printf("%x\n", *(PDWORD)lpBuff);
    //getchar();
    //强制刷新
    //FlushViewOfFile(((PDWORD)lpBuff), 4);

    //关闭映射
    UnmapViewOfFile(lpBuff);
    //关闭句柄
    CloseHandle(hMapFile);
    //关闭句柄
    CloseHandle(cFile);

    


    system("pause");
    return(0);
}