-----Original Message-----
From: Kahánek Petr
Sent: Friday, January 04, 2008 10:22 AM
To: 'boost-users@lists.boost.org'
Subject: Problems when constructing time_duration and ptime from string
Hi,
It seems there are problems with duration/ptime construction from string, no matter if one uses duration_from_string, time_from_string or operator >>.
Lets have the following code.
Using Windows XP service pack 2, MSVS2005 SP 1, Boost 1-34.1
#include <string>
#include
using namespace std;
using namespace boost;
using namespace boost::posix_time;
int _tmain(int argc, _TCHAR* argv[])
{
string str;
time_duration td;
ptime time;
// try to construct duration and ptime from string where there's no blank space between date and time
// 1) duration_from_string will pass
// 2) "time_duration >>" will pass
// 3) time_from_string will throw
// 4) "ptime >>" will pass
str = "2007-01-2010:00:05";
td = duration_from_string(str);
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
stringstream ss(str);
ss >> td;
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
try {
time = time_from_string(str);
cout << "\"" << str << "\" == " << time << endl;
}
catch(exception& e) {
cout << "time_from_string could not construct time from \"" << str << "\", " << e.what() << endl;
}
try {
stringstream ss(str);
ss >> time;
cout << "\"" << str << "\" == " << time << endl;
}
catch(exception& e) {
cout << "operator >> could not get time from '" << "', " << e.what() << endl;
}
cout << endl << endl;
// try to construct duration and ptime from "2007-01-20-1.xwerf" (mangled delimiters, rubbish in place of
// fractional sec.) --> none will throw
str = "2007-01-20-1.xwerf";
td = duration_from_string(str);
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
stringstream ss2(str);
ss2 >> td;
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
time = time_from_string(str);
cout << "\"" << str << "\" == " << time << endl;
stringstream ss3(str);
ss3 >> time;
cout << "\"" << str << "\" == " << time << endl;
cout << endl << endl;
// try to construct duration and ptime from "2007.01.20.1.xwerf" (mangled delimiters, rubbish in place of
// fractional sec.) --> none will throw
str = "2007.01.20.1.0xwerf";
td = duration_from_string(str);
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
stringstream ss4(str);
ss4 >> td;
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
time = time_from_string(str);
cout << "\"" << str << "\" == " << time << endl;
ss4 >> time;
cout << "\"" << str << "\" == " << time << endl;
cout << endl << endl;
// try to construct duration and ptime from "2008-01-03"
// none will throw, duration created although delimiter is "-", ptime created incorrectly
str = "2008-01-03";
td = duration_from_string(str);
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
stringstream ss5(str);
ss5 >> td;
cout << "\"" << str << "\" == " << to_simple_string(td) << endl;
str = "2008-01-03";
time = time_from_string(str);
cout << "\"" << str << "\" == " << time << endl;
stringstream ss6(str);
ss6 >> time;
cout << "\"" << str << "\" == " << time << endl;
// even if duration is constructed, printing it to cout with operator << without conversion to string
// will assert in strftime.c if hours are out of scope [0,23], or if minutes/seconds are out of [0,59]
cout << str << " == " << td << endl; // CRASH
return 0;
}
Output from this program:
"2007-01-2010:00:05" == 2007:34:30
"2007-01-2010:00:05" == 2007:34:30
time_from_string could not construct time from "2007-01-2010:00:05", bad lexical
cast: source type value could not be interpreted as target "2007-01-2010:00:05" == not-a-date-time
"2007-01-20-1.xwerf" == 2007:01:20.100000
"2007-01-20-1.xwerf" == 2007:01:20.100000
"2007-01-20-1.xwerf" == 2007-Apr-13 15:01:20.100000 "2007-01-20-1.xwerf" == 2007-Apr-13 15:01:20.100000
"2007.01.20.1.0xwerf" == 2007:01:20.100000 "2007.01.20.1.0xwerf" == 2007:01:20.100000 "2007.01.20.1.0xwerf" == 2007-Apr-13 15:01:20.100000 "2007.01.20.1.0xwerf" == 2007-Apr-13 15:01:20.100000
"2008-01-03" == 2008:01:03
"2008-01-03" == 2008:01:03
"2008-01-03" == 2008-Mar-26 16:01:03
"2008-01-03" == 2008-Mar-26 16:01:03
..and then it will assert on cout << td. Durations that have hours out of [0,23] or min/sec out of [0,59] are parsed successfully but cannot be printed to cout using << (assert in strftime.c).
Workaround for "pure date", e.g. "2007-01-10", is to append "0" to it. "2007-01-10 0" is parsed OK.
I guess these can be considered bugs?
Br,
Petr
Filip Konvička