一则简单的Windows共享内存IPC代码-白红宇

一则简单的Windows共享内存IPC代码

阅读量：4148 次

发布时间：2019-05-25

本文共 2850 字，大约阅读时间需要 9 分钟。

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 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        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<
        
         <

//b.cpp#include 
   
    #include 
    
     #include 
     
      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."<
      
       >s;        memcpy((PVOID)pBuf, s, BUF_SIZE);    }}