On Sun, 21 Dec 2008 17:35:55 +0100, Václav Haisman wrote:
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!
Thanks! It's things like this that make me want to bang my head against a wall sometimes. Now how do I go about guessing the format?