Subject: Re: [Boost-users] date_time question
From: Václav Haisman (v.haisman_at_[hidden])
Date: 2008-12-21 11:35:55
Amadeus W.M. wrote, On 21.12.2008 16:31:
> I want to read from stdin files that contain dates and data. The files
> come from various sources so the dates are in different formats. Of
> course, the problem is reading the dates. Based on the date_time examples
> I put together a few lines of code using facets that I thought should
> work, but it doesn't seem to. Can't tell if I'm way off, or I'm missing
> something small.
>
>
> #include <boost/date_time/posix_time/posix_time.hpp>
>
> using namespace boost::posix_time;
> using namespace std;
>
> int main(int argc, char * argv[])
> {
> // Create a facet with the expected format.
> time_input_facet * tfacet=new time_input_facet("%Y/%m/%d %H:%M:%S");
>
> ptime pt(not_a_date_time);
> cin.imbue(locale(cin.getloc(),tfacet));
> cin >> pt;
> cout << pt << endl; // pt still not_a_date_time.
>
> return 0;
> }
>
>
> Compilation:
>
>
> g++ -g -Wall -o facets -I/usr/local/include/boost-1_35 -L/usr/local/lib/
> facets.C -lboost_date_time-gcc43-mt-1_35
>
> Run:
>
> echo "12/20/2008 09:56:00" | ./facets
Your format string is "%Y/%m/%d %H:%M:%S". The date format and the string you
accept are obviously not compatible.
> not-a-date-time # pt unchanged
>
>
> Once I sort out how to read dates from stdin (initially with the format
> hard-coded) I have to figure out how to parse the date and guess the
> format internally in the program.
>
>
> Please help! Thanks!
-- VH