Re: [Lazarus] Debian (Sid): fpc 3.0.0+dfsg-2 cannot compile lazarus trunc

[John Landmesser]

Am 01.02.2016 um 18:47 schrieb Mattias Gaertner:

On Mon, 1 Feb 2016 18:20:59 +0100
John Landmesser  wrote:

Is this the new FPC 3.0.0 from Debian unstable?

Mattias

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yes it's from unstable ( sid )

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Re: [Lazarus] change Font on TButton do not work?

[Bart]

On 1/31/16, Josef Schnieder  wrote:

> But the button caption is unchanged. It appears an "A" instead of "*".
> I tested the Font in Libreoffice and it works well.
>
> any idea?

Turn of themes.

Bart

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Re: [Lazarus] Free Pascal and Lazarus learning center

[Michael Schnell]

On 01/31/2016 11:10 PM, Anthony Walter wrote:

Thanks for the idea Bo. I'll put it near the top of my queue.


+1

IMHO the knowledge about the  (great)  thread Features of Lazarus are by 
far not spread wide enough.


The "lesson" should include:

 - Motivation for the usage of threads:
 - - long winding calculations
 - - blocking sockets and other hardware / system interface
 - - exploiting multi-core hardware
 - Different programming Paradigms for Main Thread and Worker Threads
 - - Main thread: Event driven (never sleep ! )
 - - one-shot Worker threads
 - - cyclic Worker Thread
 - - - "wake up" e.g.  by blocking interfaces,TEvent or 
CriticalSection

 - - - polling with sleep (trading performance against latency)
 - Worker Thread to Main Tread Events:
 - - TTherad.Synchonize
 - - TThread.Queue
 - - Application.ProcessMessages (IMHO less important since we have 
TThread.Queue in FPC 3.x)
 - - using "Event data transport classes" to be used as an argument 
of TThread.Queue

 - Data integrity
 - - "Thread safe"
 - - CriticalSection
 - - TThreadList
 - Creating a Thread pool to prevent overhead for creating and 
destroying worker threads.

- Advanced:
-  - Threads and DLL/so

...


-Michael

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Re: [Lazarus] change Font on TButton do not work?

[Josef Schnieder]

I modified the font:
First the encoding  was "symbol" -> problem as described (it doesn't 
matter, when i change the charset)
than copy the chars, so that the encoding is "UnicodeBmp" -> problem is 
solved


The solution for me is to modify the font.

best regards
Josef


Am 01.02.2016 um 11:18 schrieb Bart:

On 1/31/16, Josef Schnieder  wrote:


But the button caption is unchanged. It appears an "A" instead of "*".
I tested the Font in Libreoffice and it works well.

any idea?

Turn of themes.

Bart

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Re: [Lazarus] Tutorial Video: Getting Started

[Mattias Gaertner]

On Mon, 1 Feb 2016 05:43:15 -0500
Anthony Walter  wrote:

> I've posted a tutorial video, which is the first in a series, titled
> "Getting Started". It's available for viewing here:
> 
> http://www.getlazarus.org/learn/tutorials/start/
> 
> Additional tutorial videos with progressively more advanced subject matter
> will be posted to the tutorials section regularly. Up next will be a brief
> introduction to the Lazarus IDE.

It says "Lazarus Learing Center" in the title.

Mattias

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[Lazarus] Tutorial Video: Getting Started

[Anthony Walter]

I've posted a tutorial video, which is the first in a series, titled
"Getting Started". It's available for viewing here:

http://www.getlazarus.org/learn/tutorials/start/

Additional tutorial videos with progressively more advanced subject matter
will be posted to the tutorials section regularly. Up next will be a brief
introduction to the Lazarus IDE.
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Re: [Lazarus] Tutorial Video: Getting Started

[Anthony Walter]

Dang it. Correction coming pronto.

On Mon, Feb 1, 2016 at 5:59 AM, Mattias Gaertner 
wrote:

> On Mon, 1 Feb 2016 05:43:15 -0500
> Anthony Walter  wrote:
>
> > I've posted a tutorial video, which is the first in a series, titled
> > "Getting Started". It's available for viewing here:
> >
> > http://www.getlazarus.org/learn/tutorials/start/
> >
> > Additional tutorial videos with progressively more advanced subject
> matter
> > will be posted to the tutorials section regularly. Up next will be a
> brief
> > introduction to the Lazarus IDE.
>
> It says "Lazarus Learing Center" in the title.
>
> Mattias
>
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Re: [Lazarus] Debian (Sid): fpc 3.0.0+dfsg-2 cannot compile lazarus trunc

[Mattias Gaertner]

On Mon, 1 Feb 2016 18:20:59 +0100
John Landmesser  wrote:

> Does anybody else has issues with Debians  fpc 3.0.0+dfsg-2

Is this the new FPC 3.0.0 from Debian unstable?

> fpc 3.0.0+dfsg-2 hangs on ..linking

Mattias

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Re: [Lazarus] Free Pascal and Lazarus learning center

[Anthony Walter]

Michael, if you or anyone with commit rights feels comfortable adding a
derived thread class (TSimpleThread) with the features I've described to
the classes unit, then I'll post my implementation to mantis as a patch.
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Re: [Lazarus] Free Pascal and Lazarus learning center

[Bo Berglund]

On Mon, 01 Feb 2016 13:53:30 +0100, Michael Schnell
 wrote:

>On 02/01/2016 12:47 PM, Bo Berglund wrote:
>> Blocking sockets is where I am now...
>So Porting AsyncPro would be a great exercise :-) !!!
>
>This is an exceptionally useful tool, great open source code once done 
>by a professional tea, but done in a Windows-only and outdated way (not 
>using TThread.Queue, but Windows messages and "procedure... message" 
>instead. Mending this and using decently portable blocking Socket and 
>Com-Port (TTY) components would do the trick.

Ouch! Now you seem to have found my old thread where I was asking
about AsyncPro. I used that in Delphi including the variation that
uses TCP/IP rather than COM: as transport layer.
I used it, without really having to understand what was going on
behind the scenes...

But as you say it is Windows-only...
And very complex to hack into as well.
So I turned to Indy10 now since I don't need serial, but have to
handle the blocking sockets in a scenario similar to event driven
handling

I will watch this!  :)


-- 
Bo Berglund
Developer in Sweden


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Re: [Lazarus] Free Pascal and Lazarus learning center

[Michael Schnell]

On 02/01/2016 12:47 PM, Bo Berglund wrote:

Blocking sockets is where I am now...

So Porting AsyncPro would be a great exercise :-) !!!

This is an exceptionally useful tool, great open source code once done 
by a professional tea, but done in a Windows-only and outdated way (not 
using TThread.Queue, but Windows messages and "procedure... message" 
instead. Mending this and using decently portable blocking Socket and 
Com-Port (TTY) components would do the trick.


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Re: [Lazarus] Free Pascal and Lazarus learning center

[Michael Van Canneyt]

On Mon, 1 Feb 2016, Anthony Walter wrote:


Just a bit of information, my Cross.Codebot library has threading built in
to the socket protocol implementations, so with regards to explaining it I
could just show the source code or I could write it a again just to
demonstrate.

With regards to complexity, I never define a new thread class, which is the
typical way most people think about working with threads in Free Pascal.
Instead I have one thread class defined in my System unit, and you pass it
your execute method along with an optional status handler. Your execute is
called, the thread object is freed for you automatically, and you don't
need to declare a new type.



[snip]


procedure TDownloadForm.DownloadClick(Sender: TObject);
begin
 if FThread <> nil then
   Exit;
 FThread := TSimpleThread.Create(Download, DownloadStatus,
DownloadComplete);
end;


This mechanism could easily be added as class static methods to TThread
itself. It would make life easier for many simple cases.

Class Procedure TThread.Spawn(MyProcedure,OnStatus,OnTerminate : 
TThreadProcedure); static;

Or "ExecuteInThread" instead of "Spawn".

Would you care to enter this as a feature request ?

Michael.

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Re: [Lazarus] Free Pascal and Lazarus learning center

[Anthony Walter]

Michael,

My implementation adds an optional Status property to a thread, which then
necessitates an instance. When Status is written (that's the optional part)
in a background thread its value is copied temporarily to a private field,
then the thread invokes Synchronize. Before your status changed handler is
notified, the thread instance copies the temporary status back to the
property read field. With this type of arrangement it's possible to update
the Status property in a background thread while the user interface might
be reading from it.

The net result is that setting Status in the background thread causes the
user interface thread to receive a notification where it can do whatever it
wants with Status. Examples: show a percentage complete, show steps being
worked on, show bytes transferred, or whatever you dream up.
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Re: [Lazarus] Free Pascal and Lazarus learning center

[Michael Van Canneyt]

On Mon, 1 Feb 2016, Anthony Walter wrote:


Michael, if you or anyone with commit rights feels comfortable adding a
derived thread class (TSimpleThread) with the features I've described to
the classes unit, then I'll post my implementation to mantis as a patch.


I feel comfortable with this :-)

I wouldn't have proposed it otherwise :)

Michael.

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Re: [Lazarus] Tutorial Video: Getting Started

[Michael Van Canneyt]

It could have been worse:

"Lazarus Leering Center"

:-)

Michael.

On Mon, 1 Feb 2016, Anthony Walter wrote:


Dang it. Correction coming pronto.

On Mon, Feb 1, 2016 at 5:59 AM, Mattias Gaertner 
wrote:


On Mon, 1 Feb 2016 05:43:15 -0500
Anthony Walter  wrote:


I've posted a tutorial video, which is the first in a series, titled
"Getting Started". It's available for viewing here:

http://www.getlazarus.org/learn/tutorials/start/

Additional tutorial videos with progressively more advanced subject

matter

will be posted to the tutorials section regularly. Up next will be a

brief

introduction to the Lazarus IDE.


It says "Lazarus Learing Center" in the title.

Mattias

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Re: [Lazarus] Tutorial Video: Getting Started

[Anthony Walter]

Fixed. Thanks for catching that. :)
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Re: [Lazarus] Free Pascal and Lazarus learning center

[Bo Berglund]

On Mon, 01 Feb 2016 11:21:45 +0100, Michael Schnell
 wrote:

>On 01/31/2016 11:10 PM, Anthony Walter wrote:
>> Thanks for the idea Bo. I'll put it near the top of my queue.
>>
>+1
>
>IMHO the knowledge about the  (great)  thread Features of Lazarus are by 
>far not spread wide enough.
I could not agree more! I have been programming Delphi since 1996 and
only very occationally used TThread objects. So I have totally
forgotten now how it was done. (I am now retired so I don't have
access to my old work code anymore)
>
>The "lesson" should include:
>
>  - Motivation for the usage of threads:
>  - - long winding calculations
>  - - blocking sockets and other hardware / system interface

Blocking sockets is where I am now...
Got some help from Remy Lebeau concerning running a TIdTcpClient
object in a TThread descendant because its methods are blocking. But
his solution is based on TThread and TEvent new functionality existing
in Delphi XE5 but not in Delphi 2007 or FreePascal 3.0
So I am essentially stuck anyway since I would like it to be a
portable solution Delphi <=> FreePascal

This is anyway why I proposed the thread section here, believing that
if I don't know enough to use it properly there are for shure a whole
bunch others that share this predicament


-- 
Bo Berglund
Developer in Sweden


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Re: [Lazarus] Free Pascal and Lazarus learning center

[Anthony Walter]

Just a bit of information, my Cross.Codebot library has threading built in
to the socket protocol implementations, so with regards to explaining it I
could just show the source code or I could write it a again just to
demonstrate.

With regards to complexity, I never define a new thread class, which is the
typical way most people think about working with threads in Free Pascal.
Instead I have one thread class defined in my System unit, and you pass it
your execute method along with an optional status handler. Your execute is
called, the thread object is freed for you automatically, and you don't
need to declare a new type.

procedure TDownloadForm.DownloadComplete(Thread: TSimpleThread);
begin
  FThread := nil;
  // Invoked in the user interface thread
  // Check Thread.Cancelled here
end;

procedure TDownloadForm.DownloadStatus(Thread: TSimpleThread);
begin
  // Invoked in the user interface thread
  // Do something with Thread.Status here
end;

procedure TDownloadForm.Download(Thread: TSimpleThread);
begin
  // Download here in a thread
  // Set Thread.Status := SomeString to sync status updates with the UI
  // FThread.Cancel cancels the thread
  // Throw exception cancels the thread
end;

procedure TDownloadForm.DownloadClick(Sender: TObject);
begin
  if FThread <> nil then
Exit;
  FThread := TSimpleThread.Create(Download, DownloadStatus,
DownloadComplete);
end;
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Re: [Lazarus] Free Pascal and Lazarus learning center

[Michael Schnell]

On 02/01/2016 03:00 PM, Bo Berglund wrote:
And very complex to hack into as well. 

If I can provide any help., please let me know.


So I turned to Indy10 now


Not a good idea IMHO, Indy is exceptionally complex.

-Michael

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Re: [Lazarus] Free Pascal and Lazarus learning center

[Sven Barth]

Am 01.02.2016 13:54 schrieb "Michael Van Canneyt" :
>
>
>
> On Mon, 1 Feb 2016, Anthony Walter wrote:
>
>> Just a bit of information, my Cross.Codebot library has threading built
in
>> to the socket protocol implementations, so with regards to explaining it
I
>> could just show the source code or I could write it a again just to
>> demonstrate.
>>
>> With regards to complexity, I never define a new thread class, which is
the
>> typical way most people think about working with threads in Free Pascal.
>> Instead I have one thread class defined in my System unit, and you pass
it
>> your execute method along with an optional status handler. Your execute
is
>> called, the thread object is freed for you automatically, and you don't
>> need to declare a new type.
>>
>
> [snip]
>
>
>> procedure TDownloadForm.DownloadClick(Sender: TObject);
>> begin
>>  if FThread <> nil then
>>Exit;
>>  FThread := TSimpleThread.Create(Download, DownloadStatus,
>> DownloadComplete);
>> end;
>
>
> This mechanism could easily be added as class static methods to TThread
> itself. It would make life easier for many simple cases.
>
> Class Procedure TThread.Spawn(MyProcedure,OnStatus,OnTerminate :
TThreadProcedure); static;
>
> Or "ExecuteInThread" instead of "Spawn".
>
> Would you care to enter this as a feature request ?

Current Delphis have something similar for anonymous functions already, so
we should use the same name, but with "of object" procvars instead (note:
the resulting thread class will be TAnonymousThread).

Regards,
Sven
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Re: [Lazarus] Free Pascal and Lazarus learning center

[Anthony Walter]

Sven,

What's the current road map look like for closures? Is it even on the
radar? If so, and if no major work has been done on it yet, an improved
syntax would go a long way in usability.
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Re: [Lazarus] Free Pascal and Lazarus learning center

[Sven Barth]

Am 01.02.2016 16:18 schrieb "Anthony Walter" :
>
> Sven,
>
> What's the current road map look like for closures? Is it even on the
radar? If so, and if no major work has been done on it yet, an improved
syntax would go a long way in usability.

Someone is working on them and a prototype exists (look in fpc-devel's
archive for December). Now the code only needs to be cleaned up.

In my head I already play around with a shorter/nicer syntax at least for
expressions (thus lambda expressions ;) ), but most ideas rely on type
inference which I'm very reluctant to add, because that's something that's
not part of the sprit of Pascal.

Regards,
Sven
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[Lazarus] Debian (Sid): fpc 3.0.0+dfsg-2 cannot compile lazarus trunc

[John Landmesser]

Does anybody else has issues with Debians  fpc 3.0.0+dfsg-2

Downgraded to fpc 2.6.4 to compile Lazarus trunc again!

My system:
Lazarus 1.7 r1.5 FPC 2.6.4 x86_64-linux-gtk 2
( Misleading information here, its Revision 51468 )

fpc 3.0.0+dfsg-2 hangs on ..linking

ok, thats Debian related, but I'm just curious



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