Frank Millman wrote: > > Hi all > > > > I need to generate potentially large reports from a database, and I > > want to offer the option of print preview before actually printing > > (using wxPython). I figure that the best way to achieve this is to > > write the report to a temporary file, or more likely to a temporary > > directory with a separate file for each page. I can use that for > > previewing and for printing, and then delete the file/directory. > >
Fabio Pliger wrote: > Why create an intermediate file to preview with wxPython? I would just > preview the data with wx and keep it inside your application. If you want to > print it just print... avoid temp file creation if it's not necessary... :) > > F.P. It depends on what you mean, Fabio. If a report contains sub-totals, page breaks, etc, it is not possible to preview a particular page at random without generating the entire report first. It is certainly possible to store the entire report in memory, using a two-dimensional list (page/line), but if a report runs into hundreds of pages, I am concerned at the amount of memory this would require. Perhaps I am being old-fashioned - with todays memory of at least 64k, it would probably fit without a problem - but I would prefer to write the pages away and read them back when needed. Frank -- http://mail.python.org/mailman/listinfo/python-list
