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// error_demo.cpp --------------------------------------------------------------------//
// Copyright Beman Dawes 2009
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
// Library home page: http://www.boost.org/libs/filesystem
//--------------------------------------------------------------------------------------//
// //
// The purpose of this program is to demonstrate how error reporting works. //
// //
//--------------------------------------------------------------------------------------//
#include <boost/filesystem.hpp>
#include <boost/system/system_error.hpp>
#include <iostream>
using std::cout;
using boost::filesystem::path;
using boost::filesystem::filesystem_error;
using boost::system::error_code;
using boost::system::system_error;
namespace fs = boost::filesystem;
namespace
{
void report_system_error(const system_error& ex)
{
cout << " threw system_error:\n"
<< " ex.code().value() is " << ex.code().value() << '\n'
<< " ex.code().category().name() is " << ex.code().category().name() << '\n'
<< " ex.what() is " << ex.what() << '\n'
;
}
void report_filesystem_error(const system_error& ex)
{
cout << " threw filesystem_error exception:\n"
<< " ex.code().value() is " << ex.code().value() << '\n'
<< " ex.code().category().name() is " << ex.code().category().name() << '\n'
<< " ex.what() is " << ex.what() << '\n'
;
}
void report_status(fs::file_status s)
{
cout << " file_status::type() is ";
switch (s.type())
{
case fs::status_error:
cout << "status_error\n"; break;
case fs::file_not_found:
cout << "file_not_found\n"; break;
case fs::regular_file:
cout << "regular_file\n"; break;
case fs::directory_file:
cout << "directory_file\n"; break;
case fs::symlink_file:
cout << "symlink_file\n"; break;
case fs::block_file:
cout << "block_file\n"; break;
case fs::character_file:
cout << "character_file\n"; break;
case fs::fifo_file:
cout << "fifo_file\n"; break;
case fs::socket_file:
cout << "socket_file\n"; break;
case fs::type_unknown:
cout << "type_unknown\n"; break;
default:
cout << "not a valid enumeration constant\n";
}
}
void report_error_code(const error_code& ec)
{
cout << " ec:\n"
<< " value() is " << ec.value() << '\n'
<< " category().name() is " << ec.category().name() << '\n'
<< " message() is " << ec.message() << '\n'
;
}
bool threw_exception;
}
int main(int argc, char* argv[])
{
if (argc < 2)
{
cout << "Usage: error_demo path\n";
return 1;
}
error_code ec;
//// construct path - no error_code
//try { path p1(argv[1]); }
//catch (const system_error& ex)
//{
// cout << "construct path without error_code";
// report_system_error(ex);
//}
//// construct path - with error_code
path p (argv[1]);
fs::file_status s;
bool b (false);
fs::directory_iterator di;
// get status - no error_code
cout << "\nstatus(\"" << p.string() << "\");\n";
threw_exception = false;
try { s = fs::status(p); }
catch (const system_error& ex)
{
report_filesystem_error(ex);
threw_exception = true;
}
if (!threw_exception)
cout << " Did not throw exception\n";
report_status(s);
// get status - with error_code
cout << "\nstatus(\"" << p.string() << "\", ec);\n";
s = fs::status(p, ec);
report_status(s);
report_error_code(ec);
// query existence - no error_code
cout << "\nexists(\"" << p.string() << "\");\n";
threw_exception = false;
try { b = fs::exists(p); }
catch (const system_error& ex)
{
report_filesystem_error(ex);
threw_exception = true;
}
if (!threw_exception)
{
cout << " Did not throw exception\n"
<< " Returns: " << (b ? "true" : "false") << '\n';
}
// query existence - with error_code
// directory_iterator - no error_code
cout << "\ndirectory_iterator(\"" << p.string() << "\");\n";
threw_exception = false;
try { di = fs::directory_iterator(p); }
catch (const system_error& ex)
{
report_filesystem_error(ex);
threw_exception = true;
}
if (!threw_exception)
{
cout << " Did not throw exception\n"
<< (di == fs::directory_iterator() ? " Equal" : " Not equal")
<< " to the end iterator\n";
}
// directory_iterator - with error_code
cout << "\ndirectory_iterator(\"" << p.string() << "\", ec);\n";
di = fs::directory_iterator(p, ec);
cout << (di == fs::directory_iterator() ? " Equal" : " Not equal")
<< " to the end iterator\n";
report_error_code(ec);
return 0;
}
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