Posted by jpluimers on 2018/05/16
For my link archive via: [WayBack] Delphi Mqtt Client (Use Indy)https://github.com/wizinfantry/delphi-mqtt-client – 오대우 – Google+
Background reading:
–jeroen
Posted in Delphi, Development, Software Development | 10 Comments »
Posted by jpluimers on 2018/05/16
Generics and constraints in Delphi is still a bit of pain.
A while ago, I needed a factory for threads. It was more convoluted than I meant it to be, so I had a short chat with Stefan Glienke.
He came up with an example similar to the one below. I tore it apart so you can on each line see what the compiler dislikes.
This fails, but was kind of how I wanted it to be:
type
TFactory = record
class function Manufacture<T: TBaseClass, constructor>(parameter definitions): T;
end;
class function Manufacture<T: TBaseClass, constructor>(parameter definitions): T;
begin
Result := T.Create(parameter values);
end;Which means I need to update Delphi Constraints in Generics – RAD Studio XE documentation wiki
The factory:
type TComponentFactory = class class function CreateComponent<T: TComponent>(AOwner: TComponent): T; static; end; class function TComponentFactory.CreateComponent<T>(AOwner: TComponent): T; var ComponentClass: TComponentClass; Component: TComponent; begin ComponentClass := T; Component := ComponentClass.Create(AOwner); // you can't do `T.Create(AOwner)` Result := T(Component); // you can't do `Result := ComponentClass.Create(AOwner);` end;
The usage:
var Component: TButton; Owner: TComponent; begin Owner := Application.MainForm; Component := TComponentFactory<TButton>.CreateComponent(Owner); Component.Parent := Owner; end;
Full source example is at: After a discussion with Stefan Glienke: a pattern for a factory, this one for components, but can be uses for anything having a base class like a TThread descendant.
In the mean time, Spring4D has added the [Archive.is] Spring4D: TActivator record with many CreateInstance methods that allow you to create instances of classes for which you just have type information.
–jeroen
This fails:
type
TFactory = record
class function Manufacture<T: TBaseClass, constructor>(parameter definitions): T;
end;
class function Manufacture<T: TBaseClass, constructor>(parameter definitions): T;
begin
Result := T.Create(parameter values);
end;
| type | |
| TComponentFactory = class | |
| class function CreateComponent<T: TComponent>(AOwner: TComponent): T; static; | |
| end; | |
| class function TComponentFactory.CreateComponent<T>(AOwner: TComponent): T; | |
| var | |
| ComponentClass: TComponentClass; | |
| Component: TComponent; | |
| begin | |
| ComponentClass := T; | |
| Component := ComponentClass.Create(AOwner); // you can't do `T.Create(AOwner)` | |
| Result := T(Component); // you can't do `Result := ComponentClass.Create(AOwner);` | |
| end; |
| var | |
| Component: TButton; | |
| Owner: TComponent; | |
| begin | |
| Owner := Application.MainForm; | |
| Component := TComponentFactory<TButton>.CreateComponent(Owner); | |
| Component.Parent := Owner; | |
| end; |
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Posted by jpluimers on 2018/05/15
Note to self (as the WSDL importer has trouble with WSDL files that include XSD files having xsd:group definitions), the default settings of the importer in the UI:
-Oa -Od -Oe -Of -Oh -Oi -Oj -Oo -Op -Ot -Ou -Ov -OxThis matches the output from the
WSDLImp.exedefault settings as well (larger screenshots below):
I suspect the reason is that the command-line importer does, but the wizard does not, show an exception during processing:
*Error*: D:\Playground\iECK DT2.0 services v2.1.1\xsd\ECK-DT2-CatalogServiceSchema-v2.1.1.xsd
> Access violation at address 0059DBA4 in module 'WSDLImp.exe'. Read of address 00000000
Done : D:\Playground\iECK DT2.0 services v2.1.1\wsdl\ECK-DT2-CatalogService-v2.1.1.wsdl>0
Writing: D:\Playground\iECK_ImportWSDL\ECK_DT2_CatalogService_v2.pas
Hopefully more on that later.
Both the IDE expert and console based WSDLimp will write the output .pas file and the output file of both tools has the same content.
–jeroen
Posted in Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Posted by jpluimers on 2018/05/15
The scripts in these links didn’t work well enough for me:
So I’ve been working on a GExperts based solution (because that gave me a nice starting point). It’s not fully done yet, so here are a few things I’ve used:
function FindMethodInstance(Root: TComponent; const MethodName: string): TMethod; virtual;
(Reminder to self: contact David Hoyle who knows a lot about the OTA).
–jeroen
Posted in Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2018/05/15
Reminder to self: more than a year later, see the progression of [Archive.is] State.of.dev, a project that visualizes the current state of development split by key topics.
Or basically a split graph of the one on the side into various graphs by topic.
Current state: Home – State.of.dev
Past state: WayBack (hopefully it got the graphs archived by now).
The author is Yvo Schaap – Medium who also wrote the very interesting post [WayBack] Why your business needs a good downturn – CTO Insights – Medium.
–jeroen
Posted in Development, Power User, Software Development | Leave a Comment »
Posted by jpluimers on 2018/05/14
Well worth watching: “A Journey to OCP”, Open Compute Meetup in Amsterdam – YouTube
Keywords: Open Compute Platform, Booking, Kohntopp
Related: [WayBack] To France… – The Isoblog.
–jeroen
Posted in Cloud, Infrastructure | Leave a Comment »
Posted by jpluimers on 2018/05/14
Ubuntu is the only Linux system I had that – after installing a text-mode console setup – gets itself in the below state with only running apt update and apt-get upgrade.
Preparing to unpack .../archives/apt_1.2.19_armhf.deb ... Failed to stop apt-daily.timer: Connection timed out See system logs and 'systemctl status apt-daily.timer' for details. Failed to get load state of apt-daily.timer: Connection timed out dpkg: warning: subprocess old pre-removal script returned error exit status 1
I could not find meaningful search results for the above thing, nor did systemctl status apt-daily.timer return anything better than
Failed to get properties: Failed to activate service 'org.freedesktop.systemd1': timed out
Heck, it doesn’t even reboot any more (no helpful search results either):
# reboot Failed to start reboot.target: Failed to activate service 'org.freedesktop.systemd1': timed out See system logs and 'systemctl status reboot.target' for details. Failed to open /dev/initctl: No such device or address Failed to talk to init daemon.
Nor did systemctl status reboot.target return anything better than
Failed to get properties: Failed to activate service 'org.freedesktop.systemd1': timed out
From the ubuntu-16.04-minimal-odroid-c1-20160817.img.xz base system, it only had these extra packages installed:
etckeepertmuxspeedtest-clisendemailDespite the workaround below, I still don’t know why I got into this situation and this leaves me with a very uncomfortable feeling.
Too bad some systems (like ODroid) only have Ubuntu based distributions as sorting out stuff like above took me way too much effort.
Posted in *nix, Development, etckeeper, Hardware Development, Internet, Linux, Odroid, Power User, SpeedTest, Ubuntu | 2 Comments »
Posted by jpluimers on 2018/05/14
Since:
every now and then you will get strange characters in only your development tools.
You can change this Windows setting, but be aware that every now and then, various Windows versions will re-enable the Left Alt+Shift even if you have previously disabled it. As of Windows 7 this occurs far less often, but still seems to occur.
Source: Question: Does anyone else have instances in the IDE (Berlin but has happened…
Comments at https://plus.google.com/+JeroenPluimers/posts/ektRa2qW92L
Posted in internatiolanization (i18n) and localization (l10), Keyboards and Keyboard Shortcuts, Power User, Windows | Leave a Comment »
Posted by jpluimers on 2018/05/11
Via a private share: If you ever loose your Google Guides level for no apparent reason, still can post reviews, but cannot post to the Google Guides forums, then just mail Google. They can usually fix the situation.
–jeroen
Posted in Google, GoogleMaps, Local Guides, Power User | Leave a Comment »
Posted by jpluimers on 2018/05/11
If you use Outlook to check and manage your email, you can easily use it to check your Gmail account as well. You can set up your Gmail account to allow you to synchronize email across multiple machines using email clients instead of a browser.
Oh: you need to lower your Gmail security for Outlook 2013 as the latter isn’t up to par on security. For that, follow similar steps like in “the user name or password for imap.gmail is incorrect” – iPad, iPod or iPhone with iOS < 7.
–jeroen
Posted in GMail, Google, Office, Office 2013, Office 2016, Outlook, Power User | Leave a Comment »
The Wiert Corner - irregular stream of stuff 