【C++】使用共享内存实现进程间通信编程语言

// ServerCom.cpp : Defines the entry point for the console application. //#include "stdafx.h"#include #include #pragma endregion #define MAP_PREFIXL"Local\\" #define MAP_NAMEL"SampleMap" #define FULL_MAP_NAMEMAP_PREFIX MAP_NAME// Max size of the file mapping object. #define MAP_SIZE65536// File offset where the view is to begin. #define VIEW_OFFSET0// The number of bytes of a file mapping to map to the view. All bytes of the // view must be within the maximum size of the file mapping object (MAP_SIZE). // If VIEW_SIZE is 0, the mapping extends from the offset (VIEW_OFFSET) to // the end of the file mapping. #define VIEW_SIZE1024// Unicode string message to be written to the mapped view. Its size in byte // must be less than the view size (VIEW_SIZE). #define MESSAGEL"Message from the first process."int _tmain(int argc, _TCHAR* argv[]) { HANDLE hMapFile = NULL; PVOID pView = NULL; // Create the file mapping object. hMapFile = CreateFileMapping( INVALID_HANDLE_VALUE,// Use paging file - shared memory NULL,// Default security attributes PAGE_READWRITE,// Allow read and write access 0,// High-order DWORD of file mapping max size MAP_SIZE,// Low-order DWORD of file mapping max size FULL_MAP_NAME// Name of the file mapping object ); if (hMapFile == NULL) { wprintf(L"CreateFileMapping failed w/err 0x%08lx\n", GetLastError()); goto Cleanup; } wprintf(L"The file mapping (%s) is created\n", FULL_MAP_NAME); // Map a view of the file mapping into the address space of the current // process. pView = MapViewOfFile( hMapFile,// Handle of the map object FILE_MAP_ALL_ACCESS,// Read and write access 0,// High-order DWORD of the file offset VIEW_OFFSET,// Low-order DWORD of the file offset VIEW_SIZE// The number of bytes to map to view ); if (pView == NULL) { wprintf(L"MapViewOfFile failed w/err 0x%08lx\n", GetLastError()); goto Cleanup; } wprintf(L"The file view is mapped\n"); // Prepare a message to be written to the view. PWSTR pszMessage = MESSAGE; DWORD cbMessage = (wcslen(pszMessage) + 1) * sizeof(*pszMessage); // Write the message to the view. memcpy_s(pView, VIEW_SIZE, pszMessage, cbMessage); wprintf(L"This message is written to the view:\n\"%s\"\n", pszMessage); // Wait to clean up resources and stop the process. wprintf(L"Press ENTER to clean up resources and quit"); getchar(); Cleanup: if (hMapFile) { if (pView) { // Unmap the file view. UnmapViewOfFile(pView); pView = NULL; } // Close the file mapping object. CloseHandle(hMapFile); hMapFile = NULL; } return 0; }

【【C++】使用共享内存实现进程间通信】

// ClientCom.cpp : Defines the entry point for the console application. //#include "stdafx.h" #include #include #pragma endregion #define MAP_PREFIXL"Local\\" #define MAP_NAMEL"SampleMap" #define FULL_MAP_NAMEMAP_PREFIX MAP_NAME// File offset where the view is to begin. #define VIEW_OFFSET0// The number of bytes of a file mapping to map to the view. All bytes of the // view must be within the maximum size of the file mapping object. If // VIEW_SIZE is 0, the mapping extends from the offset (VIEW_OFFSET) to the // end of the file mapping. #define VIEW_SIZE1024int _tmain(int argc, _TCHAR* argv[]) { HANDLE hMapFile = NULL; PVOID pView = NULL; // Try to open the named file mapping identified by the map name. hMapFile = OpenFileMapping( FILE_MAP_READ,// Read access FALSE,// Do not inherit the name FULL_MAP_NAME// File mapping name ); if (hMapFile == NULL) { wprintf(L"OpenFileMapping failed w/err 0x%08lx\n", GetLastError()); goto Cleanup; } wprintf(L"The file mapping (%s) is opened\n", FULL_MAP_NAME); // Map a view of the file mapping into the address space of the current // process. pView = MapViewOfFile( hMapFile,// Handle of the map object FILE_MAP_READ,// Read access 0,// High-order DWORD of the file offset VIEW_OFFSET,// Low-order DWORD of the file offset VIEW_SIZE// The number of bytes to map to view ); if (pView == NULL) { wprintf(L"MapViewOfFile failed w/err 0x%08lx\n", GetLastError()); goto Cleanup; } wprintf(L"The file view is mapped\n"); // Read and display the content in view. wprintf(L"Read from the file mapping:\n\"%s\"\n", (PWSTR)pView); // Wait to clean up resources and stop the process. wprintf(L"Press ENTER to clean up resources and quit"); getchar(); Cleanup: if (hMapFile) { if (pView) { // Unmap the file view. UnmapViewOfFile(pView); pView = NULL; } // Close the file mapping object. CloseHandle(hMapFile); hMapFile = NULL; } return 0; }