3dpcp/.svn/pristine/c3/c3a027315347b36452e40faae7aca0f6ddc19d9d.svn-base

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2012-09-16 12:33:11 +00:00
/*
* scan_io implementation
*
* Copyright (C) Thomas Escher, Kai Lingemann, Andreas Nuechter
*
* Released under the GPL version 3.
*
*/
#include "scanio/scan_io.h"
using std::map;
using std::pair;
using std::string;
#include <stdexcept>
using std::runtime_error;
#include <iostream>
using std::cout;
using std::cerr;
using std::endl;
#ifdef _MSC_VER
#include <windows.h>
#else
#include <dlfcn.h>
#endif
map<IOType, ScanIO *> ScanIO::m_scanIOs;
ScanIO * ScanIO::getScanIO(IOType iotype)
{
// get the ScanIO from the map
map<IOType, ScanIO*>::iterator it = m_scanIOs.find(iotype);
if(it != m_scanIOs.end())
return it->second;
// figure out the full and correct library name
string libname(io_type_to_libname(iotype));
#ifdef WIN32
libname += ".dll";
#elif __APPLE__
libname = "lib/lib" + libname + ".dylib";
#else
libname = "lib" + libname + ".so";
#endif
//cout << "Loading shared library " << libname << " ... " << std::flush;
// load the library and symbols
#ifdef _MSC_VER
HINSTANCE hinstLib = LoadLibrary(libname.c_str());
if (!hinstLib)
throw runtime_error(string("Cannot load library ") + libname);
//cout << "done." << endl;
create_sio* create_ScanIO = (create_sio*)GetProcAddress(hinstLib, "create");
if (!create_ScanIO) {
FreeLibrary(hinstLib);
throw runtime_error("Cannot load symbol create_ScanIO");
}
#else
void *ptrScanIO = dlopen(libname.c_str(), RTLD_LAZY);
if (!ptrScanIO)
throw runtime_error(string("Cannot load library ") + libname + string(": ") + dlerror());
//cerr << "done." << endl;
// reset the errors
dlerror();
// load the symbols
create_sio* create_ScanIO = (create_sio*)dlsym(ptrScanIO, "create");
const char* dlsym_error = dlerror();
if (dlsym_error) {
dlclose(ptrScanIO);
throw runtime_error(string("Cannot load symbol create_ScanIO: ") + dlsym_error);
}
#endif
// create an instance of ScanIO, save it in the map and return it
ScanIO* sio = create_ScanIO();
m_scanIOs.insert(pair<IOType, ScanIO*>(iotype, sio));
return sio;
}
void ScanIO::clearScanIOs()
{
for(map<IOType, ScanIO*>::iterator it = m_scanIOs.begin(); it != m_scanIOs.end(); ++it) {
// figure out the full and correct library name
string libname(io_type_to_libname(it->first));
#ifdef WIN32
libname += ".dll";
#elif __APPLE__
libname = "lib/lib" + libname + ".dylib";
#else
libname = "lib" + libname + ".so";
#endif
// load library, destroy the allocated ScanIO and then remove it
#ifdef _MSC_VER
HINSTANCE hinstLib = LoadLibrary(libname.c_str());
destroy_sio* destroy_ScanIO = (destroy_sio*)GetProcAddress(hinstLib, "destroy");
destroy_ScanIO(it->second);
FreeLibrary(hinstLib);
#else
void *ptrScanIO = dlopen(libname.c_str(), RTLD_LAZY);
destroy_sio* destroy_ScanIO = (destroy_sio*)dlsym(ptrScanIO, "destroy");
destroy_ScanIO(it->second);
dlclose(ptrScanIO);
#endif
}
}