Bo Berglund wrote:
Bo, I suggest that you check that your board supports GTK etc. If it
doesn't support GTK but it does have basic X graphics then fpGUI might
be the least painful option.
Back again so I could read up on this thread...
So basically a widget set is a definition on what kind of graphics
environment is used on the target system then?
No, it's one or more libraries installed on the system which contain all
the code to draw standard controls- buttons and so on- on the underlying
graphics provided by the operating system. There is a handful of widget
sets- Windows, Qt and GTK for example- and a smaller number of
underlying graphics subsystems- Windows and X as examples.
Note that in that case there is a part of Windows that implements a
widget set, and a part that implements low-level graphics. It's possible
to have the Qt widget set (and possibly others) on top of Windows's
low-level graphics.
What about making a program for Linux? Do we have to compile the same
program in different versions for different desktop managers on Linux?
Like one for Gnome, another for KDE and yet another for X???
Sounds mighty tedious and error prone...
The LCL provides an interface between your program and the available
widget set, all you have to do is set the project options to tell it
which to use at which point Lazarus or lazbuild does the work for you. X
is a red herring since it's at a lower level than a widget set.
I can't speak for anybody else, but I generally compile for GTK v1, v2,
Qt and Windows, depending on the underlying OS. If you set your target
file name to something like
myproject-$(TargetCPU)-$(TargetOS)-$(LCLWidgetType) Lazarus/lazbuild
will create distinct binaries for all combinations, the only gotcha is
that you need to make sure that the libraries implementing the widget
set are present on the target system.
My first project is to make an embedded application but develop it on
a Windows host where I also want it to be running for checks etc.
This application needs some basic graphics, like using Canvas methods
to draw simple geometric forms on an image.
No. Your first project is a simple form with one button on it that
displays "Hello, World!" in a panel. Trust me.
The embedded card is a touch panel from Technologic Systems
(http://www.embeddedarm.com/products/board-detail.php?product=TS-TPC-7390#),
which runs an embedded version of Debian Linux, I believe.
If it supports GTK (what is that?)
I've told you: it's a widget set. And I've told you what a widget set is
as well :-)
> or not I don't know but I will ask them.
You don't have to ask them. Run
dpkg --get-selections |grep gtk
and expect to see output something like
libgpod3-nogtk install
libgtk1.2 install
libgtk1.2-common install
libgtk1.2-dev install
libgtk2.0-0 install
libgtk2.0-common install
libgtk2.0-dev install
libgtkglext1 install
libgtkhtml2-0 install
libwxgtk2.6-0 install
libwxgtk2.8-0 install
pinentry-gtk2 install
python-gtk2 install
Note the -dev packages, which contain all the development (header etc.)
files. If it's a comparatively recent Debian then it will almost
certainly have the GTK v2 libraries, if it's an older one it might only
have v1. Lazarus currently defaults to v2 of GTK rather than v1, v1 is
deprecated with limited support.
If you don't have the libraries or the development packages then
installing them is fairly simple. However as recently discussed that's
not strictly the role of this mailing list: I'm sure that everybody in
here is happy to help, but what a particular reseller is doing with an
unspecified version of a standard distro is ultimately not our
responsibility.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
_______________________________________________
Lazarus mailing list
[email protected]
http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
