一则简单的Windows共享内存IPC代码

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Windows共享内存可以让两个进程对同一块内存进行读写。

以下有2个进程，a.cpp生成A进程，b.cpp生成b进程。那么a进程将不停地读名为"Global\\MyFileMappingObject"的共享内存块，而b进程不停地写名为"Global\\MyFileMappingObject"的共享内存块。从而实现IPC。

//a.cpp#include <windows.h>#include <string.h>#include <string>#include <iostream>#include <tchar.h>using namespace std;#define BUF_SIZE 256TCHAR szName[]=TEXT("Global\\MyFileMappingObject");    //指向同一块共享内存的名字int main(int argc, char *argv[]){    HANDLE hMapFile;    LPCTSTR pBuf;    hMapFile = CreateFileMapping(        INVALID_HANDLE_VALUE,    // use paging file        NULL,                    // default security        PAGE_READWRITE,          // read/write access        0,                       // maximum object size (high-order DWORD)        BUF_SIZE,                // maximum object size (low-order DWORD)        szName);                 // name of mapping object    if (hMapFile == NULL)    {        _tprintf(TEXT("Could not create file mapping object (%d).\n"),            GetLastError());        return 1;    }    pBuf = (LPTSTR) MapViewOfFile(hMapFile,   // handle to map object        FILE_MAP_ALL_ACCESS, // read/write permission        0,        0,        BUF_SIZE);    if (pBuf == NULL)    {        _tprintf(TEXT("Could not map view of file (%d).\n"),            GetLastError());        CloseHandle(hMapFile);        return 1;    }    //从main开始至此，A B process代码一样，都是获取名为"Global\\MyFileMappingObject"的共享内存的指针    //以下代码，A不停地读共享内存pBuf    while(1)    {        cout<<pBuf<<endl;        cout<<"A process: hit keyboard to receive from B process"<<endl;        getchar();    }    UnmapViewOfFile(pBuf);    CloseHandle(hMapFile);    return 0;}

//b.cpp#include <iostream>#include <Windows.h>#include <tchar.h>using namespace std;#define BUF_SIZE 256TCHAR szName[]=TEXT("Global\\MyFileMappingObject");    //指向同一块共享内存的名字int main(){    HANDLE hMapFile;    LPCTSTR pBuf;    hMapFile = CreateFileMapping(        INVALID_HANDLE_VALUE,    // use paging file        NULL,                    // default security        PAGE_READWRITE,          // read/write access        0,                       // maximum object size (high-order DWORD)        BUF_SIZE,                // maximum object size (low-order DWORD)        szName);                 // name of mapping object    if (hMapFile == NULL)    {        _tprintf(TEXT("Could not create file mapping object (%d).\n"),            GetLastError());        return 1;    }    pBuf = (LPTSTR) MapViewOfFile(hMapFile,   // handle to map object        FILE_MAP_ALL_ACCESS, // read/write permission        0,        0,        BUF_SIZE);    if (pBuf == NULL)    {        _tprintf(TEXT("Could not map view of file (%d).\n"),            GetLastError());        CloseHandle(hMapFile);        return 1;    }    //从main开始至此，A B process代码一样，都是获取名为"Global\\MyFileMappingObject"的共享内存的指针    //以下代码，B不停写共享内存pBuf    while(1)    {        TCHAR s[BUF_SIZE];        cout<<"B process: plz input sth. to be transfered to A process."<<endl;        cin>>s;        memcpy((PVOID)pBuf, s, BUF_SIZE);    }}

http://www.cnblogs.com/lihaozy/archive/2012/08/14/2638009.html

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