readme.wzd

来自「MFC扩展编程实例」· WZD 代码 · 共 44 行

/////////////////////////////////////////////////////////////////////
// Modify any class.
/////////////////////////////////////////////////////////////////////

NOTE: Typically you create shared memory in your Application Class's InitInstance()
and destroy it in ExitInstance().

// 1) open a segment of the swap file for shared memory
	m_hMap=::CreateFileMapping((HANDLE)0xffffffff, //or can be an open file handle
		0,											// security
		PAGE_READWRITE,								// or PAGE_READONLY or PAGE_WRITECOPY
		0,											// size -- high order (required if no file handle)
		0x1000,										// size -- low order (required if no file handle)
		MAP_ID);									// unique id--required if no file handle

	// view file--since we are using swap file, offset should be zero
	m_pSharedData=::MapViewOfFile(m_hMap,
		FILE_MAP_WRITE,			// or FILE_MAP_READ, FILE_MAP_COPY (FILE_MAP_WRITE is read/write)
		0,						// offset -- high order
		0,						// offset -- low order
		0);						// number of bytes (zero maps entire file)


// 2) writing to shared memory
	LPBYTE pData=(LPBYTE)((CWzdApp*)AfxGetApp())->GetSharedData();
	memcpy(pData,pWrite,10);

// 3) reading from shared memory
	BYTE pRead[10];
	LPBYTE pData=(LPBYTE)((CWzdApp*)AfxGetApp())->GetSharedData();
	memcpy(pRead,pData,10);


// 4) unview and close shared data
	::UnmapViewOfFile(m_pSharedData);
	::CloseHandle(m_hMap);


/////////////////////////////////////////////////////////////////////
// From: Visual C++ MFC Programming by Example by John E. Swanke
// Copyright (C) 1999 jeswanke. All rights reserved.
/////////////////////////////////////////////////////////////////////