20.共享内存的申请与释放

共享内存

#include <errhandlingapi.h>
#include <handleapi.h>
#include <memoryapi.h>
#include <minwindef.h>
#include <winnt.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>

#define MapFileName "共享内存"
#define BUF_SIZE 0X1000
HANDLE g_hMapFile;
LPTSTR g_lpBuff;

int main(int argc, char *argv[]) {
    getchar();
    //内核对象：物理页
    g_hMapFile = CreateFileMappingA(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, BUF_SIZE, MapFileName);
    //将物理页与线性地址进行映射
    g_lpBuff = (LPTSTR)MapViewOfFile(g_hMapFile, FILE_MAP_WRITE,0, 0, BUF_SIZE);

    *(PDWORD)g_lpBuff = 0x12345678;
    printf("%p",g_lpBuff);
    getchar();
    //关闭映射
    UnmapViewOfFile(g_lpBuff);
    //关闭句柄
    CloseHandle(g_hMapFile);
    getchar();
    return 0;
}