[Lazarus] Linux GUI Application define CONSOLE

[Kostas Michalopoulos]

As a side note, in order to figure out if your program is running under X11
in Linux you can simply check  for the DISPLAY environment variable:

program test;
uses
  SysUtils;
begin
  if GetEnvironmentVariable('DISPLAY') <> '' then
    Writeln('Hello X11')
  else
    Writeln('Hello Console');
end.

Obviously the program will detect X11 even if it is running under a
terminal emulator like xterm, konsole, gnome-terminal, etc.

This way you can detect if the user tries to run the program from a pure
console (like a virtual terminal from Ctrl+Alt+F1 to F6 in most Linux
machines or from a remote connection via SSH) or from under X11 and use the
appropriate user interface at launch time.



On Sun, Apr 14, 2013 at 3:54 PM, leledumbo <leledumbo_cool at yahoo.co.id>wrote:

> If your design is modular enough, you can use frontend-backend
> architecture.
> Only the frontend should differ. This could be achieved by having 2 .lpi
> referencing the same backend unit, with each own frontend (user interface).
>
> Another way would be to use build mode, differing in -Fu paths. One will
> refer to the console unit, while the other to the gui. This way requires
> you
> to have both units having the same interface. To ease maintenance, you
> could
> instead make one unit, but the implementation part is just an {$include}
> directive. This time, -Fi (instead of -Fu) will decide the path where the
> include file should be searched. So the layout is like:
>
> Solution 1 (-Fu):
> -backend.pas
> -frontend/
> --console/
> ---frontend.pas
> --gui/
> ---frontend.pas
>
> Solution 2 (-Fi):
> -backend.pas
> -frontend.pas
> -include/
> --console/
> ---frontend.inc
> --gui/
> ---frontend.inc
>
>
>
>
> --
> View this message in context:
> http://free-pascal-lazarus.989080.n3.nabble.com/Lazarus-Linux-GUI-Application-define-CONSOLE-tp4030537p4030599.html
> Sent from the Free Pascal - Lazarus mailing list archive at Nabble.com.
>
> --
> _______________________________________________
> Lazarus mailing list
> Lazarus at lists.lazarus.freepascal.org
> http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lazarus-ide.org/pipermail/lazarus/attachments/20130414/62e949ea/attachment-0003.html>