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121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
/*
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* scan_io implementation
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*
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* Copyright (C) Thomas Escher, Kai Lingemann, Andreas Nuechter
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*
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* Released under the GPL version 3.
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*
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*/
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#include "scanio/scan_io.h"
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using std::map;
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using std::pair;
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using std::string;
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#include <stdexcept>
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using std::runtime_error;
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#include <iostream>
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using std::cout;
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using std::cerr;
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using std::endl;
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#ifdef _MSC_VER
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#endif
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map<IOType, ScanIO *> ScanIO::m_scanIOs;
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ScanIO * ScanIO::getScanIO(IOType iotype)
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{
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// get the ScanIO from the map
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map<IOType, ScanIO*>::iterator it = m_scanIOs.find(iotype);
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if(it != m_scanIOs.end())
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return it->second;
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// figure out the full and correct library name
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string libname(io_type_to_libname(iotype));
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#ifdef WIN32
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libname += ".dll";
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#elif __APPLE__
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libname = "lib/lib" + libname + ".dylib";
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#else
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libname = "lib" + libname + ".so";
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#endif
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//cout << "Loading shared library " << libname << " ... " << std::flush;
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// load the library and symbols
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#ifdef _MSC_VER
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HINSTANCE hinstLib = LoadLibrary(libname.c_str());
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if (!hinstLib)
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throw runtime_error(string("Cannot load library ") + libname);
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//cout << "done." << endl;
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create_sio* create_ScanIO = (create_sio*)GetProcAddress(hinstLib, "create");
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if (!create_ScanIO) {
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FreeLibrary(hinstLib);
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throw runtime_error("Cannot load symbol create_ScanIO");
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}
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#else
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void *ptrScanIO = dlopen(libname.c_str(), RTLD_LAZY);
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if (!ptrScanIO)
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throw runtime_error(string("Cannot load library ") + libname + string(": ") + dlerror());
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//cerr << "done." << endl;
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// reset the errors
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dlerror();
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// load the symbols
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create_sio* create_ScanIO = (create_sio*)dlsym(ptrScanIO, "create");
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const char* dlsym_error = dlerror();
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if (dlsym_error) {
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dlclose(ptrScanIO);
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throw runtime_error(string("Cannot load symbol create_ScanIO: ") + dlsym_error);
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}
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#endif
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// create an instance of ScanIO, save it in the map and return it
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ScanIO* sio = create_ScanIO();
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m_scanIOs.insert(pair<IOType, ScanIO*>(iotype, sio));
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return sio;
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}
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void ScanIO::clearScanIOs()
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{
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for(map<IOType, ScanIO*>::iterator it = m_scanIOs.begin(); it != m_scanIOs.end(); ++it) {
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// figure out the full and correct library name
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string libname(io_type_to_libname(it->first));
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#ifdef WIN32
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libname += ".dll";
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#elif __APPLE__
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libname = "lib/lib" + libname + ".dylib";
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#else
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libname = "lib" + libname + ".so";
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#endif
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// load library, destroy the allocated ScanIO and then remove it
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#ifdef _MSC_VER
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HINSTANCE hinstLib = LoadLibrary(libname.c_str());
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destroy_sio* destroy_ScanIO = (destroy_sio*)GetProcAddress(hinstLib, "destroy");
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destroy_ScanIO(it->second);
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FreeLibrary(hinstLib);
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#else
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void *ptrScanIO = dlopen(libname.c_str(), RTLD_LAZY);
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destroy_sio* destroy_ScanIO = (destroy_sio*)dlsym(ptrScanIO, "destroy");
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destroy_ScanIO(it->second);
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dlclose(ptrScanIO);
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#endif
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}
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}
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