On Thu, 16 May 2019 13:13:16 +0200 hwilmer <h...@gc-24.de> wrote: > On 5/11/19 11:07 AM, Shlomi Fish wrote: > > Hi hwilmer, > > > > On Fri, 10 May 2019 19:09:50 +0200 > > hwilmer <h...@gc-24.de> wrote: > > > >> Hi, > >> > >> I would like to use curl to retrieve an image from a web server which I > >> want to store in a table in a mariadb database without downloading the > >> image to a file. For this application, I do not want to store > >> references to files stored in some file system instead. > >> > >> So I would want to use something like > >> > >> > >> my $binary_data = `curl -k "https://www.example.com/some.jpg"`; > >> > > > > Perl distinguishes between 8-bit/binary strings and unicode ones. See > > https://perldoc.perl.org/perlunitut.html . > > What kind of string do I get when using backticks like in the above > example? One that perl considers as a text string I could use stuff > like uc or lc on, or as a binary string I could use pack or unpack on? > Variables are without types, so there is no way to tell. If I was using > curl to receive a text string, how would I know which encoding is being > used? For all I know that could depend on the machine my program is > running on after lots of factors I would never know about. And this > same encoding could happen to the image data. > > Why would I use pack or unpack on the image data curl puts into the > string? Do I need to worry that somewhere --- like in my program or in > some method DBI provides or somewhere else --- some kind of string > transformation might take place that damages the image data? Is there a > way to tell perl that this is actually not a string but some binary data > that must not be transformed or encoded? > > So far, it's working, but that could be just luck ... >
Perhaps use open "-|" with an encoding - see https://perldoc.perl.org/functions/binmode.html . > > Note however that you should see https://perl-begin.org/uses/web-automation/ > > and use a module instead of trapping curl.exe's output. Perl has bindings to > > libcurl too if that is what you want. > > First I tried to use WWW::Mechanize, and that failed because it can't > deal witch the self-signed certificates the web server is using. I > couldn't find anywhere in the documentation how to allow such > certificates. Otherwise it seemed to be able to do what I wanted. > See https://stackoverflow.com/questions/47662461/how-to-accept-self-signed-certificates-with-lwpuseragent > Using curl via the library bindings is somewhat going to lengths I would > rather avoid. > -- ----------------------------------------------------------------- Shlomi Fish http://www.shlomifish.org/ http://youtu.be/xZLwtc9x4yA - Anime in Real Life!! (Parody) Well, one thing I can tell you about parenthood is that such things can progress from figurative to literal, extremely quickly. — http://www.shlomifish.org/humour/Summerschool-at-the-NSA/ Please reply to list if it's a mailing list post - http://shlom.in/reply . -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
![https://www.example.com/some.jpg"`](https://www.example.com/some.jpg"`){kind=link}