#include <windows.h>
#include <string>
#define memSize 512
bool writeSharedMem(std::string memName,std::string text)
{
    char* memNameChar = (char*)(memName.c_str());
    HANDLE hMapFile = OpenFileMapping(
        FILE_MAP_ALL_ACCESS,     // 读/写访问
        FALSE,                   // 句柄不继承
        memNameChar         // 共享内存对象的名称
    );

    if (hMapFile == NULL)
    {
        hMapFile = CreateFileMapping(
            INVALID_HANDLE_VALUE,    // 使用分页文件
            NULL,                    // 默认安全性
            PAGE_READWRITE,          // 读/写访问
            0,                       // 最大对象大小（高位32位）
            memSize,        // 最大对象大小（低位32位）
            memNameChar         // 共享内存对象的名称
        );
    }
    if (hMapFile == NULL)
        return false;

    char* pBuf = (char*)MapViewOfFile(
            hMapFile,                // 共享内存对象的句柄
            FILE_MAP_ALL_ACCESS,     // 读/写权限
            0,
            0,
            memSize
        );
    if (pBuf == NULL) {
        std::cerr << "Could not map view of file (" << GetLastError() << ")." << std::endl;
        CloseHandle(hMapFile);
        return false;
    }
    strcpy(pBuf, text.c_str());
    UnmapViewOfFile(pBuf);
    //CloseHandle(hMapFile);
}
std::string readSharedMem(std::string memName)
{
    char* memNameChar = (char*)(memName.c_str());
    HANDLE hMapFile = OpenFileMapping(
        FILE_MAP_ALL_ACCESS,     // 读/写访问
        FALSE,                   // 句柄不继承
        memNameChar         // 共享内存对象的名称
    );
    if (hMapFile == NULL)
    {
        std::cerr << "Could not open file mapping object (" << GetLastError() << ")." << std::endl;
        return "notFound";
    }
    char* pBuf = (char*)MapViewOfFile(
        hMapFile,                // 共享内存对象的句柄
        FILE_MAP_ALL_ACCESS,     // 读/写权限
        0,
        0,
        memSize
    );
    std::string reuslt = pBuf;
    UnmapViewOfFile(pBuf);
    //CloseHandle(hMapFile);
    return reuslt;
}
bool  releaseSharedMem(std::string memName)
{
    char* memNameChar = (char*)(memName.c_str());
    HANDLE hMapFile = OpenFileMapping(
        FILE_MAP_ALL_ACCESS,     // 读/写访问
        FALSE,                   // 句柄不继承
        memNameChar         // 共享内存对象的名称
    );
    if (hMapFile == NULL)
    {
        return false;
    }
    CloseHandle(hMapFile);
    return true;
}
#pragma once