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154 lines
3.5 KiB
C++
154 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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//
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// smem.cpp - This deals with all shared memory functions needed for
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// the MAPI component of Communicator
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// Written by: Rich Pizzarro (rhp@netscape.com)
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// November 1997
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//
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#include <windows.h>
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#include <windowsx.h>
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#include "mapismem.h"
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#ifndef ZeroMemory
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#include <memory.h>
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#define ZeroMemory(PTR, SIZE) memset(PTR, 0, SIZE)
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#endif // ZeroMemory
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//
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// *create new* shared memory chunk
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// once this is created, use the pointer
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// to the segment to to store data
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// e.g.:
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// lpString = "string for communicator";
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// lstrcpy((LPSTR)pData->m_buf[0], lpString);
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//
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CSharedMem *
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NSCreateSharedMemory(DWORD memSize, LPCTSTR memName, HANDLE *hSharedMemory)
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{
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#ifdef WIN32
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BOOL bExistedBefore;
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CSharedMem *pData;
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LPCTSTR szObjectName = memName;
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DWORD dwSize = sizeof(CSharedMem) + memSize;
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*hSharedMemory = CreateFileMapping(
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(HANDLE)0xFFFFFFFF,0,PAGE_READWRITE,0,dwSize,szObjectName);
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if(*hSharedMemory == 0)
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{
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return NULL;
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}
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bExistedBefore = (GetLastError() == ERROR_ALREADY_EXISTS);
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if(bExistedBefore)
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{
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return NULL;
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}
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pData = (CSharedMem *)MapViewOfFile(
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*hSharedMemory, FILE_MAP_ALL_ACCESS, 0, 0, 0);
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if(pData == NULL)
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{
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return NULL;
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}
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ZeroMemory(pData, dwSize);
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pData->m_dwSize = memSize;
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return pData;
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#else
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CSharedMem *sMemChunk = NULL;
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DWORD dwSize = memSize = (sizeof(CSharedMem) + memSize);
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if (sMemChunk != NULL)
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return(sMemChunk);
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sMemChunk = (CSharedMem *) GlobalAllocPtr(GMEM_MOVEABLE, dwSize);
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ZeroMemory(sMemChunk, (size_t) dwSize);
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sMemChunk->m_dwSize = dwSize; // Missing in Communicator code!
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return(sMemChunk);
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#endif // WIN32
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}
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//
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// *open existing* shared memory chunk
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// once you have the pointer to the new segment
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// use this pointer to access data, e.g.:
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//
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CSharedMem *
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NSOpenExistingSharedMemory(LPCTSTR memName, HANDLE *hSharedMemory)
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{
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#ifdef WIN32
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CSharedMem *pData;
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DWORD dwSize;
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LPCTSTR szObjectName = memName;
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*hSharedMemory = OpenFileMapping(
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PAGE_READWRITE,FALSE,szObjectName);
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if(*hSharedMemory == 0)
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{
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return NULL;
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}
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pData = (CSharedMem *)MapViewOfFile(
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*hSharedMemory,FILE_MAP_ALL_ACCESS,0,0,0);
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if(pData == NULL)
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{
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return NULL;
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}
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dwSize = pData->m_dwSize;
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return pData;
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#else
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return(NULL); // In Win16, this is really meaningless...
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#endif
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}
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//
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// to close shared memory segment
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//
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void
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NSCloseSharedMemory(CSharedMem *pData, HANDLE hSharedMemory)
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{
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#ifdef WIN32
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if(pData != 0)
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{
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UnmapViewOfFile(pData);
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pData = 0;
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}
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if(hSharedMemory != 0)
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{
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CloseHandle(hSharedMemory);
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hSharedMemory = 0;
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}
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#else
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if (pData != NULL)
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{
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GlobalFreePtr(pData);
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pData = NULL;
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}
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#endif // WIN32
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}
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