创建命名共享内存

最新推荐文章于 2024-03-29 17:30:27 发布

HisinWang

最新推荐文章于 2024-03-29 17:30:27 发布

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分类专栏： Windows核心编程笔记文章标签： win32 c++

本文链接：https://blog.youkuaiyun.com/hisinwang/article/details/45115917

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本文提供两个C++示例程序，演示如何使用Windows API创建和打开文件映射对象，进行进程间通信。通过创建文件映射对象并在内存中映射视图，实现数据写入与读取。

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Test1.cpp

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

using namespace std;

#define BUF_SIZE 256
TCHAR szName[] = TEXT("Global\\MyFileMappingObject");
TCHAR szMsg[]  = TEXT("Message for test file-mapping");

int main()
{
    //-----------------------------------------------------
    // Create File Mapping
    //-----------------------------------------------------
    HANDLE hMapFile;
    hMapFile = CreateFileMapping(
        INVALID_HANDLE_VALUE,   // use paging file
        NULL,                   // default security
        PAGE_READWRITE,         // read/write access
        0,                      // high order DWORD of max object size
        BUF_SIZE,               // low order DWORD of max object size
        szName);                // name of mapping object
    if (hMapFile == NULL)
    {
        cout << "CreateFileMapping failed with error:" 
             << GetLastError() << endl;
        return 1;
    }

    //-----------------------------------------------------
    // Map View of File
    //-----------------------------------------------------
    LPTSTR pBuf = (LPTSTR)MapViewOfFile(
        hMapFile,          // handle to map object
        FILE_MAP_READ | 
        FILE_MAP_WRITE,    // read/write permission
        0,                 // high order DWORD of the file offset 
        0,                 // low order DWORD of the file offset 
        BUF_SIZE);         // number of bytes to map
    if (pBuf == NULL)
    {
        cout << "MapViewOfFile failed with error:" 
             << GetLastError() << endl;
        return 2;
    }

    //-----------------------------------------------------
    // Write File and Read File
    //-----------------------------------------------------
    memcpy(pBuf, szMsg, sizeof(szMsg));
    getchar();
    MessageBox(NULL, pBuf, TEXT("File Mapping Test"), MB_OK);

    //-----------------------------------------------------
    // Unmap View of File and Close File Map Object
    //-----------------------------------------------------
    UnmapViewOfFile(pBuf);
    CloseHandle(hMapFile);

    //-----------------------------------------------------
    // exit
    //-----------------------------------------------------
    system("pause");
    return 0;
}

Test2.cpp

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

using namespace std;

#define BUF_SIZE 256
TCHAR szName[] = TEXT("Global\\MyFileMappingObject");

int main()
{
    //-----------------------------------------------------
    // Open File Mapping
    //-----------------------------------------------------
    HANDLE hMapFile;
    hMapFile = OpenFileMapping(
        FILE_MAP_READ |
        FILE_MAP_WRITE,    // read/write access
        FALSE,             // handle not inheritable
        szName);           // name of mapping object
    if (hMapFile == NULL)
    {
        cout << "OpenFileMapping failed with error:" 
             << GetLastError() << endl;
        return 1;
    }

    //-----------------------------------------------------
    // Map View of File
    //-----------------------------------------------------
    LPTSTR pBuf = (LPTSTR)MapViewOfFile(
        hMapFile,          // handle to map object
        FILE_MAP_READ |
        FILE_MAP_WRITE,    // read/write permission
        0,                 // high order DWORD of the file offset 
        0,                 // low order DWORD of the file offset 
        BUF_SIZE);         // number of bytes to map
    if (pBuf == NULL)
    {
        cout << "MapViewOfFile failed with error:"
             << GetLastError() << endl;
        return 2;
    }

    //-----------------------------------------------------
    // Write File and Read File
    //-----------------------------------------------------
    *pBuf = TEXT('H');
    MessageBox(NULL, pBuf, TEXT("Test File Mapping"), MB_OK);

    //-----------------------------------------------------
    // Unmap View of File and Close File Map Object
    //-----------------------------------------------------
    UnmapViewOfFile(pBuf);
    CloseHandle(hMapFile);

    //-----------------------------------------------------
    // exit
    //-----------------------------------------------------
    system("pause");
    return 0;
}