WIN32硬盘文件映射到内存

Posted 2020-12-10 ganxiang

#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 ", lpBuff);
    printf("%x ", *(PDWORD)lpBuff);
    printf("%x ", *((PDWORD)lpBuff+1));

    //写文件
    *(PDWORD)lpBuff = 0x41414141;
    printf("%x ", *(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);
}