gecko-dev/mailnews/mapi/lib/mapismem.h

102 строки
2.8 KiB
C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef __SMEM_HPP__
#define __SMEM_HPP__
//
// Need this for Win16 since it is an undocumented message
//
#ifndef WIN32
#define WM_COPYDATA 0x004A
/*
* lParam of WM_COPYDATA message points to...
*/
typedef struct tagCOPYDATASTRUCT {
DWORD dwData;
DWORD cbData;
LPVOID lpData;
} COPYDATASTRUCT, *PCOPYDATASTRUCT;
# ifndef LPCTSTR
# define LPCTSTR LPCSTR
# endif
#endif // ifndef WIN32
// The following structure will be stored in the shared memory
// and will be used to pass data back and forth
#pragma pack(4)
typedef struct
{
DWORD m_dwSize; // size of the shared memory block
BYTE m_buf[1]; // this is the buffer of memory to be used
} CSharedMem;
#pragma pack(4)
// ******************************************************
// Public routines...
// ******************************************************
//
//
// *create new* shared memory chunk
// once this is created, use the pointer
// to the segment to to store data
// e.g.:
// lpString = "string for communicator";
// lstrcpy((LPSTR)pData->m_buf[0], lpString);
// pData->m_dwBytesUsed = lstrlen(lpString) + 1; // count '\0'
//
CSharedMem *
NSCreateSharedMemory(DWORD memSize, LPCTSTR memName, HANDLE *hSharedMemory);
//
// *open existing* shared memory chunk
// once you have the pointer to the new segment
// use this pointer to access data, e.g.:
//
// This will return the pointer to the memory chunk as well as
// fill out the hSharedMemory argument that is needed for subsequent
// operations.
//
// if(pData->m_dwBytesUsed > 0)
// {
// // use pData->m_buf here
// }
//
CSharedMem *
NSOpenExistingSharedMemory(LPCTSTR memName, HANDLE *hSharedMemory);
//
// You must pass in the pointer to the memory chunk as well as
// the hSharedMemory HANDLE to close shared memory segment
//
void
NSCloseSharedMemory(CSharedMem *pData, HANDLE hSharedMemory);
#endif // __SMEM_HPP__