[Lazarus] Free Pascal / Lazarus calling conventions

[Chavoux Luyt]

Hi guys,

Just a stupid question, but is the Lazarus calling conventions documented
anywhere? Is it different from Delphi calling conventions? When calling
external c functions from libraries, does one need any special declarations
like in Delphi to tell it to use c-style calling conventions?

Related (it was actually Bo's question that got me thinking about this...
how easy/difficult would it be to write Linux drivers in Object Pascal, but
in a way that C/C++ programs can also use it? Or for that matter (since
Lazarus has been ported to Haiku) it might be easier to write drivers for
Haiku in Pascal rather than C? Maybe speed things up a bit?

Cheers,
Chavoux
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Re: [Lazarus] conditionals for detecting hardware platforms?

[Chavoux Luyt]

Hi Bo,

From: Bo Berglund 

> 

I am programming with FreePascal and Lazarus towards a Raspberry Pi2
> target platform. Doing so on the RPi2 itself is possible and basically
> works fine, except that the system is a bit sluggish at times and
> there are other inconveniences as well.
> So I moved to a Linux Mint 17.3 Mate system in a virtual computer
> (VMWare) on my Windows7 PC instead.
> 
> So I need to put some kind of conditional into my code to redirect the
> GPIO calls to some simulator I will have to build. (I am assuming that
> there is no such thing available already of course).
>
Another way (which might be easier?) is to look at the GPIO driver code
(API) on the Raspberry and write a "fake driver" (.so file?) on the Linux
system with the same name, API etc. of the Raspberry GPIO driver (I assume
that there is a driver, so forgive me if I am wrong). Since you want to
build a simulator in any case, this might be a better option that will not
require you to do anything funny in your actual application code?

Regards,
Chavoux
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Re: [Lazarus] [PATCH] components/turbopower_ipro: added the Iphttpbroker and its example

[Chavoux Luyt]

> From: Graeme Geldenhuys 
 I think it is safe to say we would all love such a solution for Object
> Pascal too. But unfortunately C is an overwhelmingly popular language,
> and most core functionality of an OS or library is implemented in it.

> Personally I agree that LCL was implemented the wrong way (not custom
> drawn), but I also need to correct you, or at least point out that even
> though fpGUI Toolkit implements ALL widgets in pure Object Pascal, and
> even has its own Object Pascal 2D graphics library for sub-pixel
> anti-aliased drawing, it too relies on external libraries. How else is
> fpGUI going to talk to X11, Win32, OS/2 etc. At some point it needs to
> talk to the windowing system of the OS (which is most likely implement
> in C, as some library). fpGUI's dependencies are magnitudes smaller than
> LCL, but there are still dependencies - you simply can't avoid that,
> other than implement a whole OS, windowing system, window manager etc in
> Object Pascal too.
Personally, I am very interested in developing a 3D Window Manager for
Linux using Object Pascal. I am still not sure if I would need to work
at the level of OpenGL (and if there are Object Pascal wrappers for
all OpenGL functions) or if there are higher-level tools in Lazarus
that could be used to write a true 3D Window Manager / Desktop
Environment for Linux? Any ideas?

Unfortunately I also do not currently have time to look at this in
more detail, so probably only in 2017. Just saying that I am seriously
interested in using Lazarus/Object Pascal at such a lower level if
possible (and it might even be ported to be cross-platform later,
depending on which underlying API it would use).

And now I am totally off-topic. But if anybody else would be
interested in something like this, please contact me... at least we
can start looking at what options are available. The other option I am
considering instead of Object Pascal is C++, which will probably have
a good interface to OpenGL. Any 3D game programmers that used Object
Pascal looking for a new challenge?

Cheers,
 Chavoux

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Re: [Lazarus] Detecting when decompiler is running

[Chavoux Luyt]

Hi

On 4 December 2015 at 18:14, 
wrote:

> 
> > I'd like to hear from others about their anti hacking tools ... ;)
>
In addition to some good points already made, I would refer you to an old
and still good article at: http://71.6.196.237/fravia/protec.htm (
http://www.woodmann.com/fravia/protec.htm). This was written from the
cracker's perspective. Keep in mind that often it is the challenge of
cracking a program, rather than making money or "stealing" a program that
drives the real cracker (somebody else often uses his work in order to try
to make money or claim fame), E.g. I have reverse engineered legally bought
copies of programs that I paid for in order to see how they did some kind
of protection (essentially to learn what you are asking from us here) or
occasionally to skip the inconvenience of having to insert a CD just in
order to start a program).

I have also once been hit by the other side of not cracking a program when
the original CD got scratched and my legally bought program became useless
because I had no backup CD. So whatever protection you use, also keep in
mind the fact that it might inconvenience your legitimate users enough that
they might stop using your program (e.g. I will never buy ARC GIS, because
a broken dongle, just as the GIS data for my thesis had to be analysed,
made it impossible to use and I then discovered powerful Open Source GIS's:
GRASS and qGIS which can do all and more for no money, but with a steeper
learning curve).

Happy hacking!
Chavoux
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[Lazarus] Lazarus for mobile development?

[Chavoux Luyt]

Hi guys,

I need to know if I can use Lazarus for mibile development on Android,
Windows mobile and iOS (iPhone)?

I currently use a program (written in Delphi, I think) that runs only on
Android and Windows mobile (and Palm OS?) called CyberTracker, which uses
MS access (.MDB) files to store both the data and the structure of the app
which will run on the mobile device. It is easy to use for creating an
app for data collection with GPS readings and pictures. Unfortunately it
does'nt run on iPhones (and I have users who need Mac and iPhone versions).

Would Lazarus be a good choice to write native apps for these mobile
devices? I have done some mobile development in Visual Studio in the past,
but only for Wndows devices. (And I have done some real embedded
development in C and assembler, but have almost no knowledge of the best
cross-platform mobile development options).

Thanks for any advice or useful links!

Cheers,
Chavoux
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Re: [Lazarus] An online package manage

[Chavoux Luyt]

 Hi Juha

 On Mon, Aug 10, 2015 at 5:29 PM, Michael Van Canneyt
 mich...@freepascal.org wrote:
  - As part of the build instructions, dependencies between packages but
 also
  between units can (and must) be specified.

 Why is that?
 Unit dependencies are already specified in uses sections of the units
 themselves.

 The most important reason I  can think of is that you can and should
specify the version of the units that will be used? I.e. it could depend on
code in a newer version of a unit that is not available in an older version
(that you might already have installed) or the other way round (old code
that got dropped in new versions - less likely, but possible)?

Cheers,
Chavoux
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[Lazarus] How to access libraries from other languages?

[Chavoux Luyt]

Hi guys,

The recent threat on Raspberry libraries made me think. I remember that it
was possible in Delphi to access .ddl libraries written in C or C++ (a bit
more work) by wrapping them and using a far call? I did this a while ago,
so not clear on the details anymore. Typically I would write a driver etc.
for hardware in C/C++ and then have a Delphi wrapper class that I could use
to access the hardware. I assume this is still possible in Lazarus? Are
there any tutorials etc. or will the old Delphi methods still work? Will
this also work with Linux .so files? For that matter, are there any other
way for Lazarus to get direct access to the hardware (except maybe use
inline assembler)?

Thanks for bringing me back up to speed!

Cheers,
Chavoux
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[Lazarus] Embedded/small database

[Chavoux Luyt]

Hi guys,

I asked advice a long time ago on a small/embedded database that could be
used for a desktop application and distributed by CD as part of the
application.I got a variety of answers including mySQL, sqlite and others.
At the time I was very partial to somehow using postgreSQL, because I had
had good experiences with it in the past and also because of postGIS (the
application should include a spatial/GIS component). But it looks like
setting up postgreSQL with a pre-existing database from the CD and all the
actual data, taking into account whether the desktop already has postgreSQL
installed and simply the size of postgreSQL (and running it as a service),
makes it not such a good fit for my application. I want the app to be
simple and quick to install and use for end-users.

I have decided to go with good old dbase (.dbf files), simply because this
is what many GIS's use, at least for their non-spatial data. I have three
questions:
1. What is your opinion on dbase for this use case? It will be a personal
Decision Support System/Expert System that will use a combination of
pre-compiled data (stored in the database during installation) and data
entered by the user (added to the database during use). I would like things
like referential integrity etc. to work as it should in a database, even
though it is small. What would be you alternatives and why?
2. What tool would you recommend for actually creating the database,
integrity etc.? I used Borland Database Engine all those years ago (it came
with Delphi), but suppose there should be better (and open source) options
now. MyDBF Studio? Or something else?
3. I see on the wiki that there are still issues with the TDbf component
for Lazarus. What would be the best option to access the .DBF files? (And
why?)

Thanks again,
Chavoux
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[Lazarus] 3D desktop written in Lazarus

[Chavoux Luyt]

Hi Lazarus Gurus,

This is a follow-up on a previous question RE OpenGL components for
Lazarus. In addition to learning openGL,what I really want to do is write a
3D desktop environment for Linux (in Lazarus, if possible). Since OpenGL is
also available for Windows and Lazarus can cross-compile, it might be
possible to port to Windows later on (but not a priority: I'd rather port
it to Haiku first).

1. What I want instead of a typical Desktop, is a 3D (like FPS game)
interface where the menu items (populated from a standard Debian/Fluxbox
menu file) are represented by e.g. books (for files) or 3D objects (for
tools) etc. and the menu groups are represented by different rooms/doors
for example.
2. Ideally it should be written so that it is easy for graphic designers to
customize.
3. But when you click on a specific program icon/object, it should open a
regular GTK/QT window with everything working as normal (maybe with
special customizable window decorations indicating the kind of program).
4. The HUD should function as a kind of shortcut to frequently used
programs.
5. In addition, it should be possible to navigate by keyboard alone (using
shortcuts and/or text auto-completion).
6. Oh, and it will be Open Source, obviously.

So I have a number of questions:
1. Does anybody know of a QT-based desktop environment that is lighter than
KDE (and not dependant on full KDE libraries)?
2. Is there an easy way to integrate OpenGL and X on Lazarus (either via
GTK or QT)?
3. I assume that creating the actual environment will be easier using a
full Lazarus Game Engine rather than only OpenGL Lazarus components.
However, should there be any difference in difficulty between accessing the
menu and opening a normal window from a game engine as compared to a
Lazarus OpenGL component?

If there is anybody who has the time, interest, (experience?), and/or more
nifty ideas for this, please contact me. For me this will be mostly a
learning process, but I also think it can be the start of something nifty
and useful.

Cheers,
Chavoux
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[Lazarus] OpenGL

[Chavoux Luyt]

Hi Lazarati

I have two questions:
1. Have there ever been a Free Pascal implementation of OpenGL? I would
like to learn OpenGL and was wondering if I will be forced to use C++/C or
if there are other options.
2. I know there are (or have been) various OpenGL Lazarus components (e.g.
GLScene, NX etc) and game engines? (JEDI SDL != OpenGL?). Which would you
advice me to install/use for learning OpenGL and why? I am not asking for a
flame-war, so please state when it is just your opinion or else give a
reason.
3. Ultimately I would like to be able to write and use a game engine based
on OpenGL (in Pascal if possible) including sound etc.

Thanks
Chavoux
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Re: [Lazarus] How to access C and C++ libraries?

[Chavoux Luyt]

Thanks everybody!

The two links were just what I needed. And some parts were faintly
familiar. :-)

Cheers
Chavoux
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[Lazarus] How to access C and C++ libraries?

[Chavoux Luyt]

Hi everybody!

Years ago I used Delphi (on Windows) to access a C or C++ API (for talking
directly with embedded device) and I can remember that there were a number
of gotchas (e.g. the calling convention had to be changed form Pascal to
something else (extern?) etc. ).

Now I am wondering about writing a simple Lazarus GUI to the Telegram API
(all C header files, AFAICT) on Linux (and maybe Windows, if not too
difficult to port). Any gotchas to keep in mind for using C and C++
libraries from Lazarus/Free Pascal (on Linux and maybe Windows) or good
guides?

Thanks
Chavoux
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[Lazarus] TFindDialog

[Chavoux Luyt]

Hi everybody

I think I am missing something, but reading through the TFindDialog
help file I still cannot figure it out: How do I specify which text
(or component) must be searched?

What I actually want to do, is to search through all files in a
directory for a specific string (the one in FindDialog.FindText) (The
current open file is in a TlpHtmlPanel).

Currently I am calling a TAsyncProcess in order to open a console and
run grep from the commandline, but there must be a better way? Even if
I have to open all the files one by one in an invisible TMemo to
search through each one. Or is there a way to pipe the output of a
TAsyncProcess (grep) back into a TMemo?

Cheers
Chavoux

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[Lazarus] Database and installation

[Chavoux Luyt]

Hi all

I have used Lazarus with PostgreSQL in a client-server setup before.
It worked very well when I installed it at a client.

I have also written desktop Delphi programs using Paradox as database
and InstallShield as the installer before, which worked very well for
distributing programs on CD (or DVD). What would be the best Lazarus
equivalent for this purpose? I.e. a program with a pre-existing,
populated database that can be distributed on (and installed from) a
CD or DVD by users.

If I use PostgreSQL it would need to see if the Postgres RDMS has
already been installed on the desktop, install it if not, populate the
PostgreSQL database with the data on the CD and install the program
itself (with possibly adding a shortcut depending on the window
manager used). I have never studied .deb (much less) .rpm packages in
detail, so I am not sure if all of this functionality can be packed in
there. And I am not really looking forward to writing InstallShield
from scratch for Windows if there is a better alternative.

Any ideas?

Thanks
Chavoux

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Re: [Lazarus] Subroutine ?

[Chavoux Luyt]

Hi Mattias



On 31 July 2013 11:00, lazarus-requ...@lists.lazarus.freepascal.org wrote:


 TComponent does not have Enabled. So the above code does not work.
 TControl has Enabled.
 Disabling a control (e.g. no focus, some widgetsets draw them
 gray) automatically disables child controls. So the easiest way
 to disable all controls on a form is to set Form1.Enabled:=false.

 Mattias

 Just a related question on this:
What happens afterwards when I say Form1.Enabled:=true; ?
If some controls were enabled beforehand and some were disabled, will this
be remembered or will I need to enable them one-by-one or will all controls
be enabled by default?

Cheers
Chavoux
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Re: [Lazarus] Lazarus, Jedi etc.

[Chavoux Luyt]

Hi Mark

On 16 July 2013 09:47, lazarus-requ...@lists.lazarus.freepascal.org wrote:

 Send Lazarus mailing list submissions to
 lazarus@lists.lazarus.freepascal.org

   From: Mark Morgan Lloyd markmll.laza...@telemetry.co.uk
  snip

If it really is so bad, why have so many developers- in particularly web
 developers- clasped it to their bosom?

For two main reasons:
1. It is (used to be) fast compared to other DB's while still handling
fairly large amounts of data.
2. Data integrity was not important to them (or they wanted to do all their
data checking on the web interface side by hand and considered it as
overkill or an unneeded resource drag on the DB side).

I have heard enough horror stories of data corruption in mySQL to agree
that it is in many ways still a toy DB and not a real RDBMS. However, when
data integrity is not that important and DB speed is a bigger priority, it
still has a role IMHO... at least it is a better choice than using text
files for storing your data.

Cheers
Chavoux
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Re: [Lazarus] Lazarus, Jedi etc.

[Chavoux Luyt]

Hi Henry

On 16 July 2013 10:28, lazarus-requ...@lists.lazarus.freepascal.org wrote:

  From: Henry Vermaak henry.verm...@gmail.com
  snip

 If it really is so bad, why have so many developers- in particularly
  web developers- clasped it to their bosom?

 Probably not, no, given that it's used by wikipedia, google, twitter,
 etc.  It just seems like Graeme and Michael are complaining that it
 doesn't default to strict mode (i.e. traditional mode in mysql
 parlance).  Lots of credibility lost if people rant about something that
  they can actually configure the way they like.

Of the three examples updates happen relatively infrequently on wikipedia,
so transactional integrity is not really important at all.
And in both the other examples speed, rather than data integrity, is the
priority (i.e. if google misses a search result or two, does it really
matter? or if I miss a tweet now and then, does it really matter?). Speed
is important, however for these applications. This is where mySQL shines.

Michael Schnell mschn...@lumino.de
 I seem to find out that this discussion is about experts making fun on
 each other, just wasting some bandwidth :-) .
I hope not! It really depends on what you want from the DB. If speed,
rather than data integrity is your priority, then mySQL is a good choice
(plus part of LAMP : although here I would advise you to use Python rather
than PHP). But if you are working with financial data, it is a really bad
idea and you need a proper RDMS.

Cheers
Chaovux
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[Lazarus] Lazarus update

[Chavoux Luyt]

Hi guys

I am still running lazarus v.1.0 RC, basically because I installed a bunch
of components (mostly 3D - GLScene, OpenGL, etc) and I can no longer
remember which ones came as part of Lazarus and which ones I had to install
myself (I am also a bit afraid that updating lazarus and fpc might break
something). Is there any way to record all currently installed components
(Lazarus inbuilt and self-installed) and automatically re-install them when
updating Lazarus? Would it be difficult to write a bash script (or .bat
file on windows) that can do this (if it does not already exist in Lazarus)?

In the same vein: any specific components to recommend for 3D game
development in Lazarus/free-pascal?

FYI I am running Lazarus on Debian stable (Mepis 11), so I normally use
.deb files for installing fpc and lazarus, (but not for components).

Thanks
Chavoux
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Re: [Lazarus] Lazarus update

[Chavoux Luyt]

Hi Mattias

Thanks... that looks really easy! I just want to confirm that this will
work the same when I install from .deb file instead of compiling from
source?

Cheers
Chavoux
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[Lazarus] Free-pascal question

[Chavoux Luyt]

Hi all

This might be slightly off-topic... I have some fpc -related questions:
1. How good is Lazarus/fpc for embedded programming (compared to C)? It
will probably be on a (custom-made) device with ARM/Atmel-based chipset
(with or without an OS - will this make a difference?).
2. I remember that the original Turbo Pascal (and Delphi) could use in-line
(i386) assembler. Is this still possible with Lazarus/free-pascal and for
other chipsets like Atmel/ARM?

Thanks
Chavoux
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Re: [Lazarus] Free-pascal question

[Chavoux Luyt]

Hi Michael

On 7 March 2013 12:11, Michael Schnell mschn...@lumino.de wrote:

 On 03/07/2013 10:45 AM, Chavoux Luyt wrote:

 1. How good is Lazarus/fpc for embedded programming (compared to C)? It
 will probably be on a (custom-made) device with ARM/Atmel-based chipset
 (with or without an OS - will this make a difference?).

  What exactly do you mean by embedded ?

I am not going to build the hardware myself, but will probably (help to)
program the device. It will be a programmable GPS collar, so I am not sure
what the engineers are going to include. But to answer your questions:


 Possible definitions include:

  - (hard) real-time

Probably not necessary. It will need a real-time clock, though.

  - direct hardware access

Yes, this will be needed.

  - interrupt programming

Yes, probably. I want to include an accelerator meter and it should send a
hardware interrupt to tell the device to take a GPS reading.

  - code in Flash memory (for diskless low-cost hardware)

Definitely diskless to fit in a GPS collar.

  - no OS

Although an OS will probably make things easier, low power consumption will
be the most (?) important requirement. An OS that runs all the time (or use
too much power to boot up every time it receives a hardware interrupt) will
probably not work (even if an open-source OS exists for a specific chipset).

  - no GUI (for headless low-cost hardware)

Yes! (If there is an OS, it might be possible to have a web interface and
embedded web server for settings etc., though).

  - memory space efficiency (for low-cost hardware)

Yes! It needs to store at least  2160 GPS data points (in addition to the
main program itself and any configuration settings).

  - speed efficiency (for low-cost hardware)

Yes!

  - cross compiling

Yes, the development will be done on Linux (either fpc or c cross-compiler)
and written to the device using whatever pins/connectors are available
(probably USB and possibly wireless/UHF - this will depend on hardware
design)

  - remote debugging

Will depend on the chipset and hardware design... can this be done using
fpc?

.Thanks
Chavoux
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Re: [Lazarus] Free-pascal question

[Chavoux Luyt]

Hi Reinier

On 7 March 2013 13:18, Reinier Olislagers reinierolislag...@gmail.com wrote:

 On 7-3-2013 11:57, Chavoux Luyt wrote:
  Will depend on the chipset and hardware design... can this be done using
  fpc?
 fpc list please.

I am not currently a member of that list. Should I join fpc-Pascal or
fpc-devel to ask this? (I assume it is one of the lists found on this
page: http://www.freepascal.org/maillist.var)?

Regards
Chavoux

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Re: [Lazarus] Free-pascal question

[Chavoux Luyt]

Hi

On 7 March 2013 15:20, Graeme Geldenhuys gra...@geldenhuys.co.uk wrote:
 On 2013-03-07 12:33, Michael Schnell wrote:
 While fpc officially does support Cross compiling, it is no especially
 easy to get it working (see the appropriate Wiki articles)


 All it takes is a bit of practice with the installation.

 Alternatively, use CodeTyphon
 [http://www.pilotlogic.com/sitejoom/index.php/codetyphon]. CodeTyphon is
 a repackaged FPC  Lazarus with lots of cross-compiling options all
 built-in, plus every component you could ever wish for. It is like the
 Studio version of Lazarus. :) Quite impressive actually.
Thanks Graeme, I'll have a look.

 Lazarus uses gdb for debugging. If you don't use an OS (such as Linux)
 on the target, you can't use the GNU created gdb receiver (either gdb
 or gdbserver).

 You could also debug using a debugserver and the dbugintf unit included
 with FPC. Making it communicate over TCP shouldn't be too hard, and is
 on my todo list. FPC includes a rudimentary console debug server, and
 LCL and fpGUI versions also exist, which are much better.
Or use a well-placed oscilloscope. ;-)
I have done a few embedded projects in the past (using C/assembler)
where that was my only debugging tool...
not so much fun for a programmer, but a good learning experience.
Unfortunately, I don't have my own oscilloscope (they are really
expensive), but I hope one of the engineers will have one.

Cheers
Chavoux

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Re: [Lazarus] Problems with Lazarus

[Chavoux Luyt]

Hi Johann

I have had similar issues in the past. I would really be nice if (like
Delphi) there was a setting in the Tools/Options window where you could set
(or at least see) the paths to all the units used by Lazarus as well as a
separate setting for the paths to all the units used by the current
project. Nothing stops Lazarus from reading and writing this information
from the .cfg file. B.T.W. since I finally got a bunch of 3D components
installed in Lazarus and did not want to go through all the trouble of
re-installing them, I am still using Lazarus 1.0 RC1, with fpc-2.6.0 on a
Debian-based system (at least until I run into a problem where I really
need an update).

As an alternative, try running fp-2.6.0 from the commandline. I am not sure
if it will solve your problem with the  missing unit/path, but if you ever
used the original Borland Turbo Pascal, you will feel right at home. And it
is much faster than Lazarus. I think for the kind of project you are
looking at, it might be the better choice.

Cheers
Chavoux

On 19 February 2013 10:17, Johann Spies johann.sp...@gmail.com wrote:

 My endeavour to return to Pascal is getting to the point of frustration:

 1.  Although I found that sometimes I have to tell Lazarus to scan the
 fpcsource to be able to find installed units, it still happens that from
 time to time I cannot compile something because a unit cannot be found.

 Today it is *Can't find unit AvgLvlTree ... check if package LazUtils is
 in the dependencies

 I have read the wiki and FAQ about this type of problems but that did not
 help at all.

 Both fpc and lazarus cannot find the unit despite the fact that I did a
 rerun of  fpcmkcfg adn despite that the following shows the unit is there:


 locate -i avglvltree
 /home/js/.lazarus/lib/LazUtils/lib/x86_64-linux/avglvltree.o
 /home/js/.lazarus/lib/LazUtils/lib/x86_64-linux/avglvltree.ppu
 /usr/share/lazarus/1.0.6/components/lazutils/avglvltree.pas
 /usr/share/lazarus/1.0.6/components/lazutils/lib/x86_64-linux/avglvltree.o

 /usr/share/lazarus/1.0.6/components/lazutils/lib/x86_64-linux/avglvltree.ppu
 /usr/share/lazarus/1.0.6/docs/xml/lazutils/avglvltree.xml
 /usr/share/lazarus/1.0.6/test/lazutils/testavglvltree.pas
 js@artikel ~/p/pascal sudo fpcmkcfg  /tmp/fpc.cfg


 *2.  My second problem is not that serious but Lazarus as an editor is
 extremely slow.  It reminds me of the reason why I do not use Eclipse for
 other projects and normally prefer Emacs or Vim.  Unfortunately the fpc-ide
 is not debug-enabled and I do not know how to enable it. I have recompiled
 the sources and according to what I understand of the configuration in the
 sources debug should be enabled.

 There must be some way to get around these type of frustrations.  Any help?

 Regards
 Johann


 PS.  I am working with Lazarus 1.0.6 and fpc-2.6.0-7 on Debian.  I have
 downloaded the packages from the Lazarus site and removed all standard
 Debian freepascal-related packages from my system.


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Re: [Lazarus] Problems with Lazarus - off-topic question

[Chavoux Luyt]

Hi Mattias

On 19 February 2013 11:12, Mattias Gaertner nc-gaert...@netcologne.dewrote:

 snip
 On some Linux the QT version is faster. Unfortunately there is no
 debian package for that. But compiling it is easy.

Is there anywhere where it is explained how this was done? The original
Delphi language was pretty much a Pascal wrapper around the Windows API
(that would probably just convert the Pascal-style calls to (far) c-style
calls and then link to the various windows .dll's)? How does this convert
into QT (or GTK for that matter)? Is there a document that explains this? I
assume this translation and linking is done by Lazarus and is not built
into fpc?

Thanks
Chavoux
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Re: [Lazarus] Problems with Lazarus - off-topic question

[Chavoux Luyt]

Thanks Mattias  Sven!

On 19 February 2013 11:43, Mattias Gaertner nc-gaert...@netcologne.dewrote:

snip

See here:
 http://wiki.freepascal.org/Qt_Interface#Quick_start_guide_for_Linux

 snip

http://wiki.freepascal.org/LCL_Internals


Sven Barth pascaldra...@googlemail.com via lists.lazarus.freepascal.org:
If you want to take a look at the API bindings just look at
$fpcsrc/rtl/win/windows.pp for the Windows API
and
$fpcsrc/packages/gtk2/src for the GTK+ API.

I will have a look!

Cheers
Chavoux
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Re: [Lazarus] Communication with PostgreSQL

[Chavoux Luyt]

Hi Johann

I wasn't going to comment since this is for a command-line program. But
what version of Lazarus do you have (and on which version of Debian)? I ask
because the Debian Lazarus packages are notoriously out of date. (E.g.
Lazarus 1.0+ has been out for a while, but not available from the main
Debian repositories for my Debian stable - based distro). I had to
install the .deb package from the Lazarus web site instead.

Cheers
Chavoux
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Re: [Lazarus] Undo/Redo in Form Designer

[Chavoux Luyt]

Hi

When I click the Save all button, don't Lazarus save only the files
that have changed since the last save? In that case, a snapshot
needs only store the information that will be saved when the Save
all button is clicked (and this information should be known somewhere
in Lazarus). AFAIK that will be diffs of the .pas, .lfm and possibly
the .lrs files of the current unit/form (and possibly of the project
file and other units if changes were made to more than 1 unit). The
point I am trying to make is that partial diffs of only the files that
were actually changed (in memory), will work.

How far back do we want undo/redo to go? Do we want to be able to
revert to a state from before the last Save all? Do we want to
revert to changes done before Lazarus was closed the previous time
(i.e. should these changes be saved when the project is closed)?

Cheers
Chavoux

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Re: [Lazarus] Lazarus support for Sorting is completely inadequate.

[Chavoux Luyt]

This is where one would want generics... I am not sure if this is
implemented in Object Pascal yet (but it is part of C++ and other
languages). I remember it being on the wish list for Delphi for a long
time, but don't know if it ever got implemented?

It would be nice if all Lazarus components could use a single fpc library
for its sorting.

Cheers
Chavoux

On 1 December 2012 19:23, Avishai avishai.g...@gmail.com wrote:

 you could just write a single comparison function,
 for the languages you have...

 That is assuming you know in advance what language will be used.  If
 you don't, then what?  I can send someone a '.po' but I can't change
 the Sort method if it isn't already in code.  What sort method should
 I include for Japanese???

 On Sat, Dec 1, 2012 at 7:21 PM, Benito van der Zander
 ben...@benibela.de wrote:
  you could just write a single comparison function,
  for the languages you have...



 --
 Shalom,
 Avishai
 avishai.g...@gmail.com
 אבישי גוֹר

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Re: [Lazarus] Updating Lazarus

[Chavoux Luyt]

Hi Mattias

On 21 November 2012 09:34, Mattias Gaertner nc-gaert...@netcologne.dewrote:

 On Tue, 20 Nov 2012 13:27:54 +0200
 Chavoux Luyt chav...@gmail.com wrote:

  Hi all
 
  I just wanted to make confirm that I am correct: If I update Lazarus
 (using
  apt on debian-based system) I will need to reinstall all the extra
  components (glScene) that I have currently installed?

 Yes.
 Well, actually if you keep your configuration (~/.lazarus) and upgrade
 to a newer version the list of installed packages is still there and
 you only need to recompile. You don't have to open every package.

Thanks, that will already help a lot.

Cheers
Chavoux
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Re: [Lazarus] Updating Lazarus

[Chavoux Luyt]

Hi all

I just wanted to make confirm that I am correct: If I update Lazarus (using
apt on debian-based system) I will need to reinstall all the extra
components (glScene) that I have currently installed? That is the way it
would have worked with Delphi, but Delphi updates were much less frequent.

Thanks
Chavoux
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Re: [Lazarus] How do you install Lazarus on Debian?

[Chavoux Luyt]

Hi Howard

On 8 November 2012 21:26, Howard Lee Harkness howard.lee.harkn...@gmail.com
 wrote:

 I'm a relative n00b at Linux admin stuff, but I'd really like to be able
 to run Lazarus on the Debian system I've just inherited at my new contract.

 I have done a checkout of the Lazarus svn repository per the instructions
 in http://wiki.freepascal.org/Getting_Lazarus. But when I execute make
 in the lazarus directory, I just get a bunch of error messages.

Do you have a specific reason why you want to install Lazarus from source
(svn)? In general I find it easier in Debian to download the .deb files and
install from there. Normally these will also ensure that the prerequisite
packages (e.g. fpc) are also installed.

HTH
Chavoux
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Re: [Lazarus] How do you install Lazarus on Debian?

[Chavoux Luyt]

Hi Howard

On 8 November 2012 21:49, Howard Lee Harkness howard.lee.harkn...@gmail.com
 wrote:

 I was not able to find the deb files. How do you download them? When I did
 a search for lazarus install on debian, I got a list of installation
 instructions for everything except Debian -- and directions for doing a
 source checkout and build.

 BTW, I missed the part about needing to configure fpc and fpc-packages
 before doing the make. After an apt-get install fpc, make appears to be
 running just fine in the lazarus directory. Now to figure out how to start
 it up...


The instructions for Ubuntu found
herehttp://wiki.freepascal.org/Install_on_Ubuntu_from_.deb_filesshould
work pretty much the same for Debian (i.e. download from
sourceforge). Also note that for the latest version it seems that there are
no longer so many small .deb files, but IIRC just the fpc, fpc-source and
lazarus packages.

A better way IMHO (but a bit more long-winded) is to create a local debs
directory (I have mine in my home directory) to which you download all .deb
files, then create a line deb file:/path/to/local/directory/debs ./ in
your /etc/apt/sources.list file.
As root run the following commands in the debs directory (I put them
together in an executable script):
ls *deb  override
dpkg-scanpackages . ./override | gzip -c -9  Packages.gz

Then run aptitude update or apt-get update (or do update from Synaptic) and
the local .deb packages should be visible in your package manager to be
installed as usual. I must warn you though, that Ubuntu .deb packages don't
always work on Debian (e.g. because some dependencies are just not
available), but at least for lazarus and fpc it worked without problems. I
also could not get the
deb http://www.hu.freepascal.org/lazarus/ lazarus-stable universe to work
in my sources.list file (or the available version was way to old).

HTH
Chavoux
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[Lazarus] How to include nxPascal: newby question

[Chavoux Luyt]

Hi guys

How do I add the nxPascal directory (or other units (.pas files)) to the
Lazarus source directory? I assumed that I had to add it to
Tools-Options-Environment-Files-FPC Source Directory (or should it be
added to the Lazarus directory instead?), but then it replaces the
/usr/share/fpcsrc/$(FPCVER)/ directory instead of adding nxPascal to the
source path? The help file doesn't really say much more. I remember that I
could add a project specific source path as well as an environment-wide
source path in Delphi. In this case I want the nxPascal units to be
available to all projects.

Thanks
Chavoux
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Re: [Lazarus] How to include nxPascal: newby question

[Chavoux Luyt]

Thanks Mattias

On 14 October 2012 23:04, Mattias Gaertner nc-gaert...@netcologne.dewrote:

 On Sun, 14 Oct 2012 22:44:29 +0200
 Chavoux Luyt chav...@gmail.com wrote:

  Hi guys
 
  How do I add the nxPascal directory (or other units (.pas files)) to the
  Lazarus source directory?

snip

 Do you mean to all your projects or really to all projects?

Sorry, I mean available to all my projects.


 Recommended way:
 Create a package, add your shared sources and then add the package to
 any project that needs the units.

Ahh. I downloaded the nxPascal source files (all .pas units) and I don't
think they are currently in a package. The demos that come with it has the
.pas files in its uses clause... If I put them all in a package, how do I
include the package in the demos (if it is not a visual component)?



 Another way, but can create conflicts:
 Add the -Fu parameter to your /etc/fpc.cfg.

Should the Options menu item not read the options from and write them back
to the /etc/fpc.cfg file?

Cheers
Chavoux
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Re: [Lazarus] Please define delphi compatibility

[Chavoux Luyt]

Guys

I think we might be getting slightly off-track. Am I right in saying that
the consensus seems to be that Delphi compatibility is basically one-way?
I.e. from Delphi to Lazarus, but not necessarily the other way round? If we
make extensions to the the IDE that does not exist in Delphi, I can see no
other option.

The only alternative I can think of is if we keep for example a Delphi
compatible TDBNavigator without the ImageList that can be used by those
who want to be able to port their Lazarus project to Delphi. (So we might
have a Delphi compatible tab for those components where the default
Lazarus components have been improved/extended in ways that cannot be
ported back to Delphi. (Or alternatively put all the extended components
in their own tab instead). Is this worth the while?

Cheers
Chavoux
P.S. I am speaking just as a Lazarus user and not the one (or more) who
would need to implement this compatibility. :-)
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Re: [Lazarus] Please define delphi compatibility

[Chavoux Luyt]

I would also like some clarification on this question. I think
personally that it should be a one-way conversion process... i.e. it
should be possible to port/import any Delphi project into Lazarus
without problems, but not necessarily the other way round.

One possible way to implement it is to create the exact same base
class for all the Delphi components and then have the Lazarus (LCL)
components inherit from these base classes.The descendent classes can
then have all the nice-to-have feature like extra properties etc. that
we want in Lazarus (or just be an exact copy of its parent class if no
change is required). In this case it might even be possible to port
back from Lazarus to Delphi, as long as you only use the base class
components and not the LCL inherited classes.

But I think FPC might have a similar problem with the Delphi language
that has already changed a bit from the original. What is the the
situation on that side?

Cheers
Chavoux

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Re: [Lazarus] Close Project means Close Project!

[Chavoux Luyt]

Hi

On 19 September 2012 09:01, Martin laza...@mfriebe.de wrote:

 On 18/09/2012 22:19, Juha Manninen wrote:

 The right fix would be to clear the last opened project memory when a
 project is closed.
 Then a new project would be created when Lazarus starts next time.
 I didn't look at the code now but it should be relatively easy. If you
 provide a patch, I can apply it.


 Actually I like and the current behaviour..

 I have open last project ay start option enabled.
 And I often find myself testing something on a New and not saved project. 
 Even if I stop working and close the IDE,  the   saved project I .worked on 
 will be back

Maybe the solution is simply to change the default settings? I think
most people (myself included) would like a closed project to stay
closed when Lazarus restarts. It is also the usual behaviour in other
IDE's. Then those who like the current setting can still change it?

Cheers
Chavoux

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Re: [Lazarus] Stable islands: testing stability

[Chavoux Luyt]

+1

On 17 September 2012 07:39, Reinier Olislagers
reinierolislag...@gmail.comwrote:

 MML's post on stable islands has made me think.

 Below some ideas for discussion:
 If we want to know whether a certain combination of
 OS+FPC+Lazarus+packages is stable, we:
 1. should ask the user
 2. don't trust him completely though and we should get measurements

 Short-term action
 =
 I suggest we can create a Lazarus GUI that
 - asks the user how stable he thinks Lazarus is
 - collects test measurement data (see below)
 The GUI can then display the results, save them for the user's own use
 (import in database etc), and upload to a central web page

 The GUI could run these tests:
 - compiler test suite. Custom test code; results available as XML, IIRC.
 - FPC database tests (e.g. for bufdataset, memds, sdfdataset, perhaps
 test Firebird embedded, sqlite, as well as any specified in the user's
 database.ini). These are fpcunit tests; can spit out e.g. XML
 - any other fpc tests written with fpcunit
 - Lazarus non-GUI tests (can't remember what data format these have)

 Medium-term action
 ==
 - Have FPC report not only version but also SVN revision (much like
 lazarus does in help/about) so that data can be used to pinpoint exactly
 what version is used if checked out from SVN (e.g. trunk)
 - Write small cross platform database application to collect, read in
 test results into database; useful for user's own use
 - Similar but for a central web site. Web page with results could be
 done much like the compiler test suite page
 - Extend FPC fpcunit tests for packages (both in coverage and number of
 packages tested)
 - Extend Lazarus non-GUI tests (e.g. fill stringgrid, save as csv, load
 from csv, compare grid contents). Perhaps even a policy/behaviour
 change: no new units accepted without relevant tests (of course where
 feasible)
 - Extend packages so that there is a self-test possibility: the GUI
 mentioned above) and/or IDE shoul run unit tests in the packages and get
 the resutls. Example: Lazreport creates sample report, outputs to file,
 and compares file contents with expected contents

 Extending the test suites etc. would aid in regression testing as long
 as attention is paid to the trend in test faults.

 What do you think?

 Thanks,
 Reinier

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Re: [Lazarus] Lazbuild on IBM Power6 (OpenSuse Linux)

[Chavoux Luyt]

Hi Leonardo

On 17 September 2012 13:53, Leonardo M. Ramé l.r...@griensu.com wrote:

 On 2012-09-17 09:18:22 +, Mark Morgan Lloyd wrote:
  Leonardo M. Ramé wrote:

  I've installed FPC 2.7.1 from sources and Lazarus also from
  sources.
  

Just one question: Are you sure Lazarus works with FPC2.7.1? I got the idea
that it only works with FPC2.6? I might be wrong and it might not be a
problem when installing from source, though. Just an idea to check.

Cheers
Chavoux
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Re: [Lazarus] Proprietary vs Open Source mentality

[Chavoux Luyt]

Hi guys

On 3 September 2012 02:34, Craig Peterson cr...@scootersoftware.com wrote:

 I don't think it's an open source vs closed source mentality. It's quite
 possible that Uwe can't open source it; in the post you linked he even
 mentions that he used knowledge of the compiler internals to implement it.
 snip

I think we are missing the point here. It was not so much about Uwe himself
as about the difference in mindset between open source and
shareware/freeware. Personally I think many freeware programmers first
want to see how  popular their component/program is with the hope of later
selling it (or selling a non-free de luxe version) once it gets popular
enough. That is why they want to keep the source closed (not saying that
this is the reason behind Uwe's decision). But at the same time they loose
out on the benefit of having other programmers improving their product free
of charge.

I think the point was that the proprietary mindset is in general not a
productive way of thinking. If you are not making money from something
anyway, why not share the source code? Then others may learn from you and
(especially if you hate writing documentation) understand exactly how to
use your program/component and in addition, actually improve your code if
they want to add extra features (that you might find useful in turn). Also,
when you loose interest or don't have time for the project any more, there
will be probably be somebody to continue with it.

Regards
Chavoux
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Re: [Lazarus] Components dcu?

[Chavoux Luyt]

Hi Michael

On 29 August 2012 09:50, Michael Schnell mschn...@lumino.de wrote:

 On 08/28/2012 04:23 PM, Chavoux Luyt wrote:

 I remember reading a long time ago that Lazarus has to be rebuilt
 whenever a new component is added. I know that this is not necessary in
 Delphi.

 Recompiling is just part of the normal process of installing a package
 that provides one or more visual components. I feel you hardly notice it if
 you don't look too close and just click OK. :-) .

 So what is the problem ?

My real problem was getting my Delphi Components to work in Lazarus without
breaking the whole IDE. It seems like the best thing to do is to just
backup the lazarus executable before trying to add the new component?

Regards
Chavoux
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[Lazarus] Components dcu?

[Chavoux Luyt]

Hi guys

I remember reading a long time ago that Lazarus has to be rebuilt whenever
a new component is added. I know that this is not necessary in Delphi. Can
someone explain why? Or refer me to the right documentation (or code). Is
this a FPC problem or Lazarus specific? What I really want to know is how
much work is it going to be to get Lazarus to install new components
without recompiling? If it is possible, I would like to help getting this
to work in Lazarus. What magic is Delphi using? I assume that somehow
Delphi dynamically link the .dcu object files?

Are there any open source IDE' s that can add new components without
needing a rebuilt?

Thanks
Chavoux
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Re: [Lazarus] Components dcu?

[Chavoux Luyt]

Thanks for the link guys!

On 28 August 2012 16:51, Graeme Geldenhuys gra...@geldenhuys.co.uk wrote:

 As Mattias suggested, read the wiki page to fully understand the issue (or
 non-issue).

 Coming from a Delphi background (where developers can't rebuild the IDE),
 it must sound like a daunting task, but it fact it is no different to
 compiling your own projects. Lazarus IDE even includes a menu item in the
 Tools menu to help facilitate the process. Once you have done it a
 handful of times, it becomes a no-brainer. Plus it's not like you install
 new components every day either.

I read through the wiki, but it seems like they only discuss the
possibilities. Nothing has been done yet? Do we actually know how Delphi
did it (on the wiki it looks like we are still guessing)? I wrote a few
components for Delphi and would like to import them into Lazarus. I just
thought it would be nice to do it without needing to recompile Lazarus
every-time (and if I made a stuff-up my whole IDE will not be
dysfunctional).

Cheers
Chavoux
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Re: [Lazarus] Delphi post-XE3 roadmap

[Chavoux Luyt]

Sorry for a newbie question, but how is FPC connected to gcc anyways?
Doesn't it translate the (object) pascal code directly into the
various machine languages for the different platforms (Or into
assembler and then machine language)? Pascal, only needs a one-pass
compiler, making it by nature much faster to compile than C based
languages, so why would FPC use anything C or C++ (except for external
function calls to the OS API)?

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Re: [Lazarus] ImagesforLazarus problem

[Chavoux Luyt]

Hi Mattias

On 14 August 2012 11:17, Mattias Gaertner nc-gaert...@netcologne.de wrote:


 Can you test with Lazarus 1.0 RC1?

I installed 1.0 RC1 and it is working without problems now.


 Thanks!

Cheers
Chavoux
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[Lazarus] Newbie linking question...

[Chavoux Luyt]

Hi guys

When I try to install a new package (glScene), everything seems to compile
fine, only to stop with a fatal error:

/usr/bin/ld: warning: ../link.res contains output sections; did you forget
-T?
/usr/bin/ld: cannot find -lXxf86vm
lazarus.pp(133,1) Error: Error while linking
lazarus.pp(133,1) Fatal: There were 1 errors compiling module, stopping

what is this lXxf86vm file?

I have installed the new Lazarus (lazarus_1.0RC1-0_i386.deb and
fpc_2.6.0-120728.deb).

Thanks in advance
Chavoux
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Re: [Lazarus] Newbie linking question...

[Chavoux Luyt]

Thanks Daniel

On 13 August 2012 19:12, Daniel Gaspary dgasp...@gmail.com wrote:

 I believe you are using ubuntu, and this is happening because a missing
 library.


 Try to install the following package: libxxf86vm-dev

 sudo apt-get install libxxf86vm-dev

I am actually using Debian, but that solved the problem.

Cheers
Chavoux
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[Lazarus] Right tool for the job?

[Chavoux Luyt]

Hi guys

I am thinking of writing a new (3D) window manager for linux using
OpenGL/glScene in Lazarus. Do you think it is the right tool for the job,
or should I rather look at something else using C or C++ directly with
openGL?

Thanks!
Chavoux
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Re: [Lazarus] Right tool for the job?

[Chavoux Luyt]

Hi Graeme

On 8 August 2012 10:20, Graeme Geldenhuys graemeg.li...@gmail.com wrote:

 The Object Pascal language is 100% fine for just about any task
 GUI app, Console app, CGI / Web app, Services/Daemon apps etc. There
 are already a few X11 window managers implemented using Object Pascal.
 XPDE (implemented using Kylix 3), fpwm (available on SourceForge which
 first used fpGUI Toolki, but not sure what it uses now) etc. I have
 also seen some window managers implemented using SDL (projects also
 available on SourceForge), and FPC includes SDL bindings out of the
 box.

Thanks for the answer. While I am very comfortable with the Object Pascal
language, I know that the original Delphi was in many case simply a very
thin layer over the Windows API (sometimes simply a Pascal translation).
That is why I was not so sure about its use on Linux (especially for 3D).

I just want to confirm that SDL bindings you talk about is not the same as
the JEDI SDL tools? Or does the JEDI SDL components make use of these
existing bindings?

Thanks again
Chavoux
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[Lazarus] ImagesforLazarus problem

[Chavoux Luyt]

Hi Everybody

When I want to compile (and install) the ImagesforLazarus package, I get an
error: Error: Duplicate identifier IMAGESFORLAZARUS
I am trying to install the glScene package and need this package to be
installed first. Any ideas why?

In the source code I see this:

{ This file was automatically created by Lazarus. Do not edit!
This source is only used to compile and install the package.
}

unit ImagesforLazarus;

interface

uses
  IS THIS CORRECT?-ImagesforLazarus, LazBMP, LazJPG, LazPNG, LazPNM,
LazTGA, LazXPM,
LazarusPackageIntf;


Is it correct for the unit to use itself? If I comment out the
ImagesforLazarus part, and then recompile the unit, it asks to reload
file from disk and then simply ignore the file I just saved, reverting back
to the original file somehow.  (If I say to ignore the files from disk, it
still gives me this same error message).

Thanks
Chavoux
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