Windows下FileMapping之进程通信

最新推荐文章于 2025-12-21 01:26:32 发布

原创最新推荐文章于 2025-12-21 01:26:32 发布 · 288 阅读

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#windows #FileMapping #进程通信

FileMapping之进程通信

读取端

#include <iostream>
#include <Windows.h>
#include <sddl.h>
#include <thread>
#include <chrono>
#pragma comment(lib, "Advapi32.lib")

char* pData = nullptr;
int main()
{
    // create event handle
    SECURITY_ATTRIBUTES sa;
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;
    // common user support
    PSECURITY_DESCRIPTOR pSD = NULL;
    if (!ConvertStringSecurityDescriptorToSecurityDescriptor(
        L"D:(A;;GA;;;AU)(A;;GA;;;SY)",
        1,//SDDL_REVISION_1,
        &pSD,
        NULL)) {
    }
    sa.lpSecurityDescriptor = pSD;
    HANDLE hMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, 0x100, L"FileMappingTest");
    if (hMapping != NULL)
    {
        pData = (char*)MapViewOfFile(hMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);
    }
    else {
        int nCode = GetLastError();
        std::cout << "Create file mapping failed: " << GetLastError() << "\n";
        return -1;
    }
    int nIndex = 0;
    while (1) {
        std::this_thread::sleep_for(std::chrono::milliseconds(3000));
        if (strlen(pData)) {
            std::cout << "Data: " << pData << "\n";
        }
        if ((++nIndex) >= 20)break;
    }
    getchar();
    UnmapViewOfFile(pData);
    CloseHandle(hMapping);
    return 0;
}

2、写入端

#include <iostream>
#include <Windows.h>
#include <sddl.h> 


#include <thread>
#include <chrono>
#pragma comment(lib, "Advapi32.lib")


char* pData = nullptr;
int main()
{
    const char* sharessdl = "D:P(A;OICI;GA;;;SY)(A;OICI;GA;;;BA)(A;OICI;GR;;;IU)";
    SECURITY_ATTRIBUTES security;
    ZeroMemory(&security, sizeof(security));
    security.nLength = sizeof(security);
    ConvertStringSecurityDescriptorToSecurityDescriptorA(
        sharessdl,
        SDDL_REVISION_1,
        &security.lpSecurityDescriptor,
        NULL);
    HANDLE hMapping = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, L"FileMappingTest");
    if (hMapping != NULL)
    {
        pData = (char*)MapViewOfFile(hMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);
#if 1
#if 0
        const char* pSrc = "exit";
#else
        DWORD nPid = GetCurrentProcessId();
        std::string strPid = std::to_string(nPid);
        const char* pSrc = strPid.c_str();
        //const char* pSrc = "34600";
#endif
        strcpy_s(pData, strlen(pSrc) + 1, pSrc);
        UnmapViewOfFile(pData);
        std::cout << "Set share data: " << strPid << "\n";
#endif
        HANDLE hEvent = OpenEvent(EVENT_ALL_ACCESS, FALSE, L"EventFileMapping");
        if (NULL != hEvent) {
            SetEvent(hEvent);
            CloseHandle(hEvent);
            std::cout << "Notify event\n";
        }
        else {
            std::cout << "Open event error: " << GetLastError();
        }
    }
    else {
        int nCode = GetLastError();
        std::cout << "Create file mapping failed: " << GetLastError() << "\n";
        return -1;
    }

    getchar();
    CloseHandle(hMapping);
    return 0;
}