Windows 进程间通信 共享内存

向内存中写数据

// SharedMemorySample_write_main.cpp
#include <SDKDDKVer.h>
#include <Windows.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    int        shmem_size = 16;  // 16byte
    HANDLE    shmem = INVALID_HANDLE_VALUE;
    HANDLE    mutex = INVALID_HANDLE_VALUE;

    mutex = ::CreateMutex(NULL, FALSE, "mutex_sample_name");

    shmem = ::CreateFileMapping(
        INVALID_HANDLE_VALUE,
        NULL,
        PAGE_READWRITE,
        0,
        shmem_size,
        "shared_memory_name"
        );

    char *buf = (char*)::MapViewOfFile(shmem, FILE_MAP_ALL_ACCESS, 0, 0, shmem_size);


    for (unsigned int c = 0; c < 60; ++c) {
        // mutex lock
        WaitForSingleObject(mutex, INFINITE);

        // write shared memory
        memset(buf, c, shmem_size);

        printf("write shared memory...c=%d
", c);

        // mutex unlock
        ::ReleaseMutex(mutex);

        ::Sleep(1000);
    }

    // release
    ::UnmapViewOfFile(buf);
    ::CloseHandle(shmem);
    ::ReleaseMutex(mutex);

    return 0;
}

从内存中读数据

// SharedMemorySample_read_main.cpp
#include <SDKDDKVer.h>
#include <Windows.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    int        shmem_size = 16;  // 16byte
    HANDLE    shmem = INVALID_HANDLE_VALUE;
    HANDLE    mutex = INVALID_HANDLE_VALUE;

    mutex = ::CreateMutex(NULL, FALSE, "mutex_sample_name");

    shmem = ::CreateFileMapping(
        INVALID_HANDLE_VALUE,
        NULL,
        PAGE_READWRITE,
        0,
        shmem_size,
        "shared_memory_name"
        );

    char *buf = (char*)::MapViewOfFile(shmem, FILE_MAP_ALL_ACCESS, 0, 0, shmem_size);


    for (unsigned int c = 0; c < 60; ++c) {
        // mutex lock
        WaitForSingleObject(mutex, INFINITE);

        printf("read shared memory...c=%d
", buf[0]);

        // mutex unlock
        ::ReleaseMutex(mutex);

        ::Sleep(1000);
    }

    // release
    ::UnmapViewOfFile(buf);
    ::CloseHandle(shmem);
    ::ReleaseMutex(mutex);

    return 0;
}