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98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
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/* -*- 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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#ifndef __SMEM_HPP__
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#define __SMEM_HPP__
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//
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// Need this for Win16 since it is an undocumented message
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//
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#ifndef WIN32
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#define WM_COPYDATA 0x004A
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/*
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* lParam of WM_COPYDATA message points to...
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*/
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typedef struct tagCOPYDATASTRUCT {
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DWORD dwData;
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DWORD cbData;
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LPVOID lpData;
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} COPYDATASTRUCT, *PCOPYDATASTRUCT;
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# ifndef LPCTSTR
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# define LPCTSTR LPCSTR
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# endif
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#endif // ifndef WIN32
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// The following structure will be stored in the shared memory
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// and will be used to pass data back and forth
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#pragma pack(4)
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typedef struct
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{
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DWORD m_dwSize; // size of the shared memory block
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BYTE m_buf[1]; // this is the buffer of memory to be used
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} CSharedMem;
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#pragma pack(4)
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// ******************************************************
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// Public routines...
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// ******************************************************
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//
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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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// pData->m_dwBytesUsed = lstrlen(lpString) + 1; // count '\0'
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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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// *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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// This will return the pointer to the memory chunk as well as
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// fill out the hSharedMemory argument that is needed for subsequent
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// operations.
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//
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// if(pData->m_dwBytesUsed > 0)
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// {
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// // use pData->m_buf here
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// }
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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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// You must pass in the pointer to the memory chunk as well as
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// the hSharedMemory HANDLE 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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#endif // __SMEM_HPP__
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