Posted by jpluimers on 2018/10/15
I’ve used these myself:
There are many more listed in for instance these links:
IIPC OpenWayBack:
–jeroen
Posted in Internet, InternetArchive, Power User, WayBack machine | Leave a Comment »
Posted by jpluimers on 2018/10/12
Especially HTC devices used to store part of the context information like this:
<HTCData><Twitter>id:11111111/friendof:00000000</Twitter></HTCData>
[WayBack] TweeterID – Twitter ID and username converter:
Convert any Twitter account’s username or @handle into its respective Twitter ID, or convert ID to username
You can also do the Twitter ID to @handle conversion by URL (at the time of writing, neither existed, which is intentional: replace your own ID there) [WayBack] permalinks – URL link to Twitter user with ID, not name – Stack Overflow:
I could not find a twitter URL that does the conversion the other way around.
–jeroen
Posted in Power User, SocialMedia, Twitter | Leave a Comment »
Posted by jpluimers on 2018/10/12
Even for Geeks like me, this is a great on-line tool for converting media files: [WayBack/Archive] Zamzar – video converter, audio converter, image converter, eBook converter
Thanks Matijn for pointing me to this.
And for nerds there is ffmpeg:
for name in *.ogg; do ffmpeg -i "$name" -ab 128k -map_meta_data 0:0,s0 "${name/.ogg/.mp3}"; done;
–jeroen
Posted in Audio, Emoticons, ffmpeg, Geeky, Media, Power User, Video | Leave a Comment »
Posted by jpluimers on 2018/10/12
For removing the yellowing of ABS plastics:
In addition to homemade gel mixtures, hydrogen peroxide-based hair bleaching creams available at beauty supply stores can also be used as a ready-made mix.
More background information:
–jeroen
Posted in History, LifeHacker, Power User | Leave a Comment »
Posted by jpluimers on 2018/10/11
Hopefully I get this to work after fixing
The first part of the fix was to
The second part is getting the USB web cameras to work.
I’ve got two types, but the label on them doesn’t list their common name, only their P/N sometimes with M/N:
The MotionEyeOS web interface didn’t list any working cameras so I had to do some digging.
Luckily [WayBack] Webcam software and driver support for Windows has a table of part and model numbers combined with product names, so they got revealed them as these:
Both are supported by motion according to [WayBack] Logitech < Motion < Foswiki though the Quick Cam Messenger needs [WayBack] Quickcam Messenger & Communicate driver for Linux which I should try to cross-compile one day.
The latter works fine. Below are some settings I used.
Posted in *nix, Development, Hardware Development, Linux, Odroid, Power User | Leave a Comment »
Posted by jpluimers on 2018/10/11
What is the proper way for pooling of TCustomConnection instances in Delphi, that allows to distinguish between instances that have effectively equal connection properties and the ones that are effectively unequal?
I’ve tried searching the RTL and VCL sources and didn’t find a generic way.
I could copy either of the specific ones I found (see list below) and adapt them to a more generic solution or adapt one of the answers in #16404051 to be for TCustomConnection, but I wonder if there is an existing solution for TCustomConnection in the first place.
Specific ones I found in Delphi XE8:
- DBX: unit Data.DBXPool
- FireDAC: unit FireDAC.Stan.Pool
- IBX: unit IBX.IBConnectionBroker
Source [WayBack] database connection – Looking for a generic way to pool TCusomConnection in Delphi – Stack Overflow
Hopefully by now I’ve some implementation for this that works nicely.
If not, these might get me started too:
In the .NET world, I take these things for granted, and it looks like ADO already does it out of the box as well:
–jeroen
via: [WayBack] Is there a Delphi library that allows for pooling of TCustomConnection… – Jeroen Wiert Pluimers – Google+
Posted in Delphi, Delphi XE8, Development, Software Development | 2 Comments »
Posted by jpluimers on 2018/10/10
[WayBack] linux – dmesg time vs system time time isnt correct – Server Fault helped me solve this problem with an Odroid C1+ running busybox:
[root@meye-062016b9 ~]# hwclock --show Wed Apr 3 20:25:47 2013 0.000000 seconds [root@meye-062016b9 ~]# date Wed May 31 09:48:18 UTC 2018 [root@meye-062016b9 ~]# hwclock --systohc --utc [root@meye-062016b9 ~]# hwclock --show Wed May 31 09:48:29 2018 0.000000 seconds [root@meye-062016b9 ~]# date Wed May 31 09:48:35 UTC 2018 [root@meye-062016b9 ~]#Note: If your logging clock in
/var/log/dmesg.logis wrong by an exact couple of hours, then try [WayBack] syslog time wrong – but date returns the correct time? and edit [WayBack]/etc/sysconfig/clock.
The above involves looking if I can get MotionEyeOS working Giving up on the official Ubuntu for Odroid C1 image.
So far not much luck: the Ubuntu got hosed, but before it was stable as in that didn’t reboot suddenly.
Now the MotionEyeOS (which is busybox based) reboots itself without notice about every 3 minutes, despite no other hardware connected and trying 3 different power supplies.
The Odroid C1+ only draws 0.34 Ampère at 5.13 Volt which is well within specs.
I’m puzzled:
[Wed May 31 09:49:51 2018] Booting Linux on physical CPU 0x200 [Wed May 31 09:52:20 2018] Booting Linux on physical CPU 0x200 [Wed May 31 09:54:50 2018] Booting Linux on physical CPU 0x200 [Wed May 31 09:57:19 2018] Booting Linux on physical CPU 0x200 [Wed May 31 09:59:49 2018] Booting Linux on physical CPU 0x200 [Wed May 31 10:02:22 2018] Booting Linux on physical CPU 0x200 [Wed May 31 10:04:56 2018] Booting Linux on physical CPU 0x200 [Wed May 31 10:07:26 2018] Booting Linux on physical CPU 0x200 [Wed May 31 10:09:59 2018] Booting Linux on physical CPU 0x200 [Wed May 31 10:12:29 2018] Booting Linux on physical CPU 0x200 [Wed May 31 10:14:58 2018] Booting Linux on physical CPU 0x200
—jeroen
Posted in *nix, *nix-tools, Power User | Leave a Comment »
Posted by jpluimers on 2018/10/10
The below came in really useful in an old project I took over that was full of bugs having to do with improper casts and FreeAndNil usage.
EDIT 20181010: WordPress.com keeps mangling angle-brackets in pre and code sections, so I added the code to a gist; see link below.
First the examples.
procedure TMyServer.UnbindFromIdTcpServerStatusContext(const aContext: TIdContext);
var
lClientSession: TClientSession;
begin
lClientSession := TObjectHelper.Cast<TClientSession>(aContext.Data);
...
end;
type
TBaseDataInterface = class(TObject)
strict private
FDatabase: TIBDatabase;
FTransaction: TIBTransaction;
...
end;
destructor TBaseDataInterface.Destroy();
begin
TObjectHelper.FreeAndNil(FDatabase);
TObjectHelper.FreeAndNil(FTransaction);
...
inherited Destroy();
end;
And the implementation.
unit ObjectHelperUnit;
interface
type
TObjectHelper = record
class function Cast<T: class>(const aValue: TObject): T; static;
class procedure FreeAndNil<T: class>(var Value: T); static;
end;
implementation
uses
System.SysConst,
System.SysUtils;
class function TObjectHelper.Cast<T>(const aValue: TObject): T;
var
lException: Exception;
begin
if Assigned(aValue) then
begin
if aValue is T then
Result := T(aValue)
else
begin
lException := EInvalidCast.CreateFmt('%s; actual type %s but expected %s.',
[SInvalidCast, aValue.QualifiedClassName, T.QualifiedClassName]);
raise lException;
end;
end
else
Result := nil;
end;
class procedure TObjectHelper.FreeAndNil<T>(var Value: T);
begin
System.SysUtils.FreeAndNil(Value);
end;
end.
–jeroen
Gist:
| unit ObjectHelperUnit; | |
| interface | |
| type | |
| TObjectHelper = record | |
| class function Cast<T: class>(const aValue: TObject): T; static; | |
| class procedure FreeAndNil<T: class>(var Value: T); static; | |
| end; | |
| implementation | |
| uses | |
| System.SysConst, | |
| System.SysUtils; | |
| class function TObjectHelper.Cast<T>(const aValue: TObject): T; | |
| var | |
| lException: Exception; | |
| begin | |
| if Assigned(aValue) then | |
| begin | |
| if aValue is T then | |
| Result := T(aValue) | |
| else | |
| begin | |
| lException := EInvalidCast.CreateFmt('%s; actual type %s but expected %s.', | |
| [SInvalidCast, aValue.QualifiedClassName, T.QualifiedClassName]); | |
| raise lException at ReturnAddress; | |
| end; | |
| end | |
| else | |
| Result := nil; | |
| end; | |
| class procedure TObjectHelper.FreeAndNil<T>(var Value: T); | |
| begin | |
| System.SysUtils.FreeAndNil(Value); | |
| end; | |
| end. |
| procedure TMyServer.UnbindFromIdTcpServerStatusContext(const aContext: TIdContext); | |
| var | |
| lClientSession: TClientSession; | |
| begin | |
| lClientSession := TObjectHelper.Cast<TClientSession>(aContext.Data); | |
| … | |
| end; | |
| type | |
| TBaseDataInterface = class(TObject) | |
| strict private | |
| FDatabase: TIBDatabase; | |
| FTransaction: TIBTransaction; | |
| … | |
| end; | |
| destructor TBaseDataInterface.Destroy(); | |
| begin | |
| TObjectHelper.FreeAndNil(FDatabase); | |
| TObjectHelper.FreeAndNil(FTransaction); | |
| … | |
| inherited Destroy(); | |
| end; |
Posted in Delphi, Development, Software Development | 16 Comments »
Posted by jpluimers on 2018/10/09
Netcat to the rescue waiting for a Windows 10 upgrade to finish (which can take hours):
while ! nc -z 172.22.0.67 3389; do echo "sleeping"; sleep 10; done; echo 'The server is up!'
Via: [WayBack] tcp – How can I trigger a script when a certain port becomes available for requests? – Unix & Linux Stack Exchange, quoting from the answer:
ncis Netcat, “the Swiss-army knife for TCP/IP”,-zmeans: do not send any data, just check if the port is open,while ! nc -z …; do sleep 0.1; done: keep checking and sleeping for one tenth of a second until the port opens up, i.e. Netcat returns with a zero (success) status.
–jeroen
Posted in *nix, *nix-tools, Communications Development, Development, Internet protocol suite, Power User, TCP, Windows | Leave a Comment »
Posted by jpluimers on 2018/10/09
After the trouble in Ubuntu: Fixing the myserious “Failed to stop apt-daily.timer: Connection timed out” I got into more trouble:
apt-get update && apt-get upgrade hung the device.
It booted fine, but a new update showed it was in a hosed state.
I don’t expect vendor supported distributions to fail this way, so I gave up on the ubuntu-16.04-minimal-odroid-c1-20160817.img.xz .
–jeroen
| root@odroidC1:~# apt-get update && apt-get upgrade | |
| Hit:1 http://ports.ubuntu.com/ubuntu-ports xenial InRelease | |
| Hit:2 http://ports.ubuntu.com/ubuntu-ports xenial-updates InRelease | |
| Hit:3 http://ports.ubuntu.com/ubuntu-ports xenial-backports InRelease | |
| Hit:4 http://ports.ubuntu.com/ubuntu-ports xenial-security InRelease | |
| Hit:5 http://deb.odroid.in/c1 xenial InRelease | |
| Reading package lists… Done | |
| E: dpkg was interrupted, you must manually run 'dpkg –configure -a' to correct the problem. | |
| root@odroidC1:~# dpkg –configure -a | |
| Processing triggers for ureadahead (0.100.0-19) … | |
| Setting up initramfs-tools (0.122ubuntu8.8) … | |
| update-initramfs: deferring update (trigger activated) | |
| Processing triggers for systemd (229-4ubuntu17) … | |
| Processing triggers for initramfs-tools (0.122ubuntu8.8) … | |
| update-initramfs: Generating /boot/initrd.img-4.4.0-28-generic | |
| WARNING: missing /lib/modules/4.4.0-28-generic | |
| Ensure all necessary drivers are built into the linux image! | |
| depmod: ERROR: could not open directory /lib/modules/4.4.0-28-generic: No such file or directory | |
| depmod: FATAL: could not search modules: No such file or directory | |
| depmod: WARNING: could not open /var/tmp/mkinitramfs_FQEGW2/lib/modules/4.4.0-28-generic/modules.order: No such file or directory | |
| depmod: WARNING: could not open /var/tmp/mkinitramfs_FQEGW2/lib/modules/4.4.0-28-generic/modules.builtin: No such file or directory | |
| root@odroidC1:~# df -h | |
| Filesystem Size Used Avail Use% Mounted on | |
| udev 396M 0 396M 0% /dev | |
| tmpfs 81M 3.3M 78M 5% /run | |
| /dev/mmcblk0p2 59G 1.1G 55G 2% / | |
| tmpfs 403M 0 403M 0% /dev/shm | |
| tmpfs 5.0M 0 5.0M 0% /run/lock | |
| tmpfs 403M 0 403M 0% /sys/fs/cgroup | |
| /dev/mmcblk0p1 128M 11M 118M 9% /media/boot |
Posted in Development, Hardware Development, Odroid | 3 Comments »
The Wiert Corner - irregular stream of stuff 