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59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
// SharedMemory.h: interface for the CSharedMemory class.
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//
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//////////////////////////////////////////////////////////////////////
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#pragma once
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#include <afx.h>
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#include "DllDefines.h"
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class UTILITYDLL CSharedMemory : public CObject
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{
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public:
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CSharedMemory();
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CSharedMemory(LPCTSTR pszName, DWORD dwBytes, bool NameExtension);
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~CSharedMemory() final;
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DWORD_PTR CreateSharedMem(LPCTSTR pszName, DWORD dwBytes);
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DWORD_PTR CreateSharedMemEx(LPCTSTR pszName, DWORD dwBytes, bool NameExtension = false);
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LPVOID getDirectMap() const;
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DWORD GetSize() const;
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//
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// methods to set whether to ummap shm upon destruction
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void SetUnmappedOnDeleted(bool bDelete);
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// Will return 0 or ERROR_ALREADY_EXISTS if it already exists.
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LPVOID Open(DWORD dwTimeout = INFINITE); // SM must be opened before use. The pointer
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// returns must be type casted to it type
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// Returns NULL if the SM was not created ot failed
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bool Close(); // SM should be closed after use so that others can open the SM
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bool IsOpen() const
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{
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return m_bOpen;
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} // Check if SM is opened
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DWORD GetLength() const
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{
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return m_dwLength;
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}
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#ifdef _DEBUG
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virtual void AssertValid() const;
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virtual void Dump(CDumpContext& dc) const;
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#endif
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protected:
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DECLARE_DYNAMIC(CSharedMemory)
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private:
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DWORD CalculateShmSize(DWORD dwSize) const;
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HANDLE m_hMutex{ nullptr };
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LPVOID m_pvData{ nullptr };
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HANDLE m_hMapping{ nullptr };
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bool m_bOpen{ false };
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DWORD m_dwLength{ 0 };
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bool m_bUnMappedOnDeleted{ true };
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};
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