79 lines
1.5 KiB
C++
79 lines
1.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1998 Microsoft Corporation
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//
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// Module Name:
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// DllBase.h
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//
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// Abstract:
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// Dynamic Loadable Library (DLL) wrapper class.
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//
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// Implementation File:
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// DllBase.cpp
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//
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// Author:
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// Galen Barbee (galenb) February 11, 1998
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//
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// Revision History:
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//
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// Notes:
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//
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _DLLBASE_H_
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#define _DLLBASE_H_
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class CDynamicLibraryBase
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{
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public:
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CDynamicLibraryBase()
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{
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m_lpszLibraryName = NULL;
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m_lpszFunctionName = NULL;
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m_hLibrary = NULL;
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m_pfFunction = NULL;
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}
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virtual ~CDynamicLibraryBase()
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{
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if (m_hLibrary != NULL)
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{
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::FreeLibrary(m_hLibrary);
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m_hLibrary = NULL;
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}
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}
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BOOL Load()
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{
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if (m_hLibrary != NULL)
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return TRUE; // already loaded
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ASSERT(m_lpszLibraryName != NULL);
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m_hLibrary = ::LoadLibrary(m_lpszLibraryName);
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if (NULL == m_hLibrary)
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{
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// The library is not present
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return FALSE;
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}
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ASSERT(m_lpszFunctionName != NULL);
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ASSERT(m_pfFunction == NULL);
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m_pfFunction = ::GetProcAddress(m_hLibrary, m_lpszFunctionName );
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if ( NULL == m_pfFunction )
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{
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// The library is present but does not have the entry point
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::FreeLibrary( m_hLibrary );
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m_hLibrary = NULL;
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return FALSE;
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}
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ASSERT(m_hLibrary != NULL);
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ASSERT(m_pfFunction != NULL);
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return TRUE;
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}
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protected:
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LPCSTR m_lpszFunctionName;
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LPCTSTR m_lpszLibraryName;
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FARPROC m_pfFunction;
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HMODULE m_hLibrary;
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};
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#endif //_DLLBASE_H_
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