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一则简单的Windows共享内存IPC代码


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 256 TCHAR 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 objectif (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 256 TCHAR 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 objectif (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); } }




【一则简单的Windows共享内存IPC代码】

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