92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/*=========================================================================
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Program: Insight Segmentation & Registration Toolkit
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Module: $RCSfile$
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Language: C++
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Date: $Date$
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Version: $Revision$
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Copyright (c) 2002 Insight Consortium. All rights reserved.
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices for more information.
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=========================================================================*/
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// .NAME cmDynamicLoader - class interface to system dynamic libraries
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// .SECTION Description
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// cmDynamicLoader provides a portable interface to loading dynamic
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// libraries into a process.
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#ifndef __cmDynamicLoader_h
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#define __cmDynamicLoader_h
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#include "cmStandardIncludes.h"
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// Ugly stuff for library handles
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// They are different on several different OS's
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#if defined(__hpux)
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# include <dl.h>
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typedef shl_t cmLibHandle;
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#elif defined(_WIN32)
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#include <windows.h>
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typedef HMODULE cmLibHandle;
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#else
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typedef void* cmLibHandle;
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#endif
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// C++ Does not allow casts from pointer-to-data types to
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// pointer-to-function types. However, the return type from each
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// platform's symbol lookup implementation is void*. We need to hide
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// the cast from void* to a pointer-to-function type in C code. The
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// implementation of cmDynamicLoader::GetSymbolAddress simply calls a
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// C-based implementation in cmDynamicLoaderC.c. This
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// cmDynamicLoaderFunction type is the return type of
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// cmDynamicLoader::GetSymbolAddress and can be cast to any other
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// pointer-to-function type safely in C++.
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extern "C" { typedef void (*cmDynamicLoaderFunction)(); }
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class cmDynamicLoader
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{
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public:
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// Description:
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// Load a dynamic library into the current process.
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// The returned cmLibHandle can be used to access the symbols in the
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// library.
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static cmLibHandle OpenLibrary(const char*);
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// Description:
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// Attempt to detach a dynamic library from the
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// process. A value of true is returned if it is successful.
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static int CloseLibrary(cmLibHandle);
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// Description:
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// Find the address of the symbol in the given library
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static cmDynamicLoaderFunction GetSymbolAddress(cmLibHandle, const char*);
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// Description:
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// Return the library prefix for the given architecture
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static const char* LibPrefix();
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// Description:
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// Return the library extension for the given architecture
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static const char* LibExtension();
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// Description:
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// Return the last error produced from a calls made on this class.
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static const char* LastError();
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protected:
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cmDynamicLoader() {};
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~cmDynamicLoader() {};
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private:
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cmDynamicLoader(const cmDynamicLoader&); // Not implemented.
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void operator=(const cmDynamicLoader&); // Not implemented.
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};
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#endif
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