On 2005-01-16 20:23, koen de wijs <[EMAIL PROTECTED]> wrote:
> I heard that C is the most powerfull language under unix and almost
> the complete system is written under it. You can do everything with
> it. Where is a good toturial?
Many good C resources are available online at:
http://www.eskimo.com/%7Escs/C-faq/top.html
You can also find some references for printed books there. The C
language is not difficult to start using, but there _are_ some finer
points that newcomers can grasp more easily after reading a few
printed books.
> Can you read and write directly with the printer port or does the
> kernell block that?
Accessing the hardware directly is one of the most unportable things
you can do with C and UNIX. You should try using the proper device
file instead, if possible.
For printers that would be /dev/lpt0, /dev/lpt1, etc.
> I got a programm from someone that putted some assmebler in his c
> programm to adress the printer port.
Very unportable, as I said above. Writing a C program that uses
fopen() or open() on the /dev/lpt0 file (or any other lpt device),
would be much preferable.
> And where can I find an overview of all the *.h files that you can
> use under FreeBSD
The manpages that define the relevant APIs are usually your best bet.
Then, when you are experienced enough with C you may start reading the
*.h files under /usr/include directly.
> Are there any visual programming tools under FreeBSD, like click and
> drag like microsoft visual c? The only options that I found where:
> GTK, KDE libs and Gnome libs or directly tlak with the x server.
I'm sure there are some. A lot of people like using IDEs like
KDevelop or Eclipse. The good thing about the compilers and other
tools of FreeBSD is that you don't *have* to use an IDE though.
A good editor is usually all one needs. This is why many people
prefer to stay away from IDEs altogether and use vim or Emacs to edit
their programs instead.
> The other languages that I know are: Perl, I could only find that it
> is especially for tasks for your system and that it's based on C Shell
> scripts, for tasks for your systems and simple programms Python.
>
> What are the advantages of these languages above C and are there more
> programming languages under FreeBSD?
This is a very difficult question to answer without getting you to learn
all the relevant languages first. Every language has its own merits, I
guess. You can learn as many of them as you like, or you can pick 2-3
of them and stick with them. The choise is yours to make...
- Giorgos
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