78 lines
1.7 KiB
C++
78 lines
1.7 KiB
C++
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// DynamLnk.cpp : base class for DLLs which are loaded only when needed
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#include "stdafx.h"
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#include "DynamLnk.h"
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DynamicDLL::DynamicDLL(LPCTSTR ptchLibraryName, LPCSTR* apchFunctionNames)
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: m_hLibrary( (HMODULE)-1 ),
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m_apfFunctions( NULL ),
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m_ptchLibraryName( ptchLibraryName ),
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m_apchFunctionNames( apchFunctionNames ),
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m_nNumFunctions( 0 )
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{
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ASSERT( !IsBadStringPtr(m_ptchLibraryName,MAX_PATH) );
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ASSERT( NULL != apchFunctionNames );
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for (LPCSTR pchFunctionName = *apchFunctionNames;
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NULL != pchFunctionName;
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pchFunctionName = *(++apchFunctionNames) )
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{
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m_nNumFunctions++;
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ASSERT( !IsBadStringPtrA(pchFunctionName,MAX_PATH) );
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}
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}
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DynamicDLL::~DynamicDLL()
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{
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if (NULL != m_apfFunctions)
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{
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delete m_apfFunctions;
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m_apfFunctions = NULL;
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}
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if ((HMODULE)-1 != m_hLibrary && NULL != m_hLibrary)
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{
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VERIFY( ::FreeLibrary( m_hLibrary ) );
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m_hLibrary = NULL;
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}
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}
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BOOL DynamicDLL::LoadFunctionPointers()
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{
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if ((HMODULE)-1 != m_hLibrary)
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return (NULL != m_hLibrary);
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m_hLibrary = ::LoadLibrary( m_ptchLibraryName );
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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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// let this throw an exception
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m_apfFunctions = new FARPROC[m_nNumFunctions];
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for (INT i = 0; i < m_nNumFunctions; i++)
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{
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m_apfFunctions[i] = ::GetProcAddress( m_hLibrary, m_apchFunctionNames[i] );
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if ( NULL == m_apfFunctions[i] )
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{
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// The library is present but does not have all of the entrypoints
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VERIFY( ::FreeLibrary( m_hLibrary ) );
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m_hLibrary = NULL;
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return FALSE;
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}
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}
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return TRUE;
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}
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FARPROC DynamicDLL::QueryFunctionPtr(INT i) const
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{
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if ( 0 > i || m_nNumFunctions <= i || NULL == m_apfFunctions || NULL == m_apfFunctions[i] )
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{
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ASSERT( FALSE );
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return NULL;
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}
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return m_apfFunctions[i];
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}
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