Posted by jpluimers on 2019/04/16
Very interesting question [WayBack] delphi – IfThen(Assigned(Widget), Widget.Description, ‘No Widget’) doesn’t crash. Should it? – Stack Overflow.
Three important things here:
- depending on inlining and kind of arguments, function calls can evaluate their arguments one or multiple times
- lacking formal language specification, you never know if a method will be inlined or not
- function calls should not have side effects
Via another interesting discussion at [WayBack] Inline functions are not guaranteed to evaluate their arguments exactly once… – David Heffernan – Google+
–jeroen
Posted in Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2019/04/15
Cool tool if you use Postfix: mail-filters/Makefile at master · fumiyas/mail-filters.
You set it up like this:
cd /etc/postfix
wget https://raw.githubusercontent.com/fumiyas/mail-filters/master/postfix/Makefile
Then each time you change your postfix configuration:
cd /etc/postfix
make
In that directory, it will (re)generate a Makefile.postmapbased on the lines with hash in main.cf, then make each .db file from the source hash file.
After that you have to manually restart postfix, which depends on your Linux flavour.
Similar solutions:
–jeroen
Posted in *nix, *nix-tools, Development, Makefile, postfix, Power User, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2019/04/15
Just when I thought I made a note of a password I hardly ever use, I didn’t, luckily this open source tools understands how to recover many kinds of passwords: AlessandroZ/LaZagne: Credentials recovery project.
–jeroen
Posted in *nix, *nix-tools, Chrome, Development, DVCS - Distributed Version Control, Firefox, git, Internet Explorer, Office, Opera, Outlook, Power User, Python, Scripting, Skype, Software Development, Source Code Management, Web Browsers, WiFi, Windows | Leave a Comment »
Posted by jpluimers on 2019/04/15
If you see the below in your Postfix log when trying to test your config, then the SASL configuration is empty. Oddly that seems the default on OpenSuSE for a while now, despite it providing cyrus SASL out of the box.
Sep 15 14:30:07 katrien postfix/smtpd[12719]: fatal: bad string length 0 < 1: smtpd_sasl_path =
Sep 15 14:30:08 katrien postfix/master[12400]: warning: process /usr/lib/postfix/smtpd pid 12719 exit status 1
Sep 15 14:30:08 katrien postfix/master[12400]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling
Prior OpenSuSE versions had this in /etc/postfix/main.cf:
# SASL stuff
############################################################
smtp_sasl_auth_enable = no
smtp_sasl_security_options =
smtp_sasl_password_maps =
smtpd_sasl_auth_enable = no
#smtpd_sasl_path = private/auth
#smtpd_sasl_type = dovecot
Newer OpenSuSE versions have this:
# SASL stuff
############################################################
smtp_sasl_auth_enable = no
smtp_sasl_security_options =
smtp_sasl_password_maps =
smtpd_sasl_auth_enable = no
# cyrus : smtpd_sasl_type = cyrus, smtpd_sasl_path = smtpd
# dovecot : smtpd_sasl_type = dovecot, smtpd_sasl_path = private/auth
smtpd_sasl_path =
smtpd_sasl_type =
Despite the newer having these installed:
# rpm -qa | grep cyrus
cyrus-sasl-crammd5-2.1.26-14.2.aarch64
cyrus-sasl-2.1.26-14.2.aarch64
cyrus-sasl-plain-2.1.26-14.2.aarch64
cyrus-sasl-digestmd5-2.1.26-14.2.aarch64
cyrus-sasl-gssapi-2.1.26-14.2.aarch64
Solution:
smtpd_sasl_path = smtpd
smtpd_sasl_type = cyrus
Since the values for both lines are default, you could even comment them out; see the documentation:
–jeroen
Via: [WayBack] postfix IRC logs [July 26 – 2007]
Posted in *nix, *nix-tools, Linux, openSuSE, postfix, Power User, SuSE Linux, Tumbleweed | Leave a Comment »
Posted by jpluimers on 2019/04/12
Every now and then I hear about providers that refuse to hand over the VoIP SIP credentials.
If you do have access to your modem, you can Wireshark the WAN side, then reset the modem and capture traffic until it has obtained the VoIP information:
[WayBack] Telfort SIP (getest met Glasvezel) | Het leven van Teus & Simone:
Veel mensen op het forum van Telfort vragen zich af of ze de SIP gegevens kunnen krijgen voor telefonie zodat men de ExperiaBox niet hoeven te gebruiken. Gezien dat de Telfort Support deze gegevens…
Via:
–jeroen
Posted in *nix, *nix-tools, Internet, Power User, Wireshark | Leave a Comment »
Posted by jpluimers on 2019/04/12
Confused by crontab expressions? Me too, so I was happy to find: At minute 3 past every 12th hour: crontab.guru – the cron schedule expression editor.
It has a [WayBack] truckload of common crontab expressions, but more importantly allows you to live edit one, then explains in human terms what it means and when the schedule runs next.
If you like a step by step cron configurator, then you can try [WayBack] Cron Job Generator by GenerateIt.net but need to note it cannot interpret a cron expression.
–jeroen
Posted in *nix, *nix-tools, cron, Linux, Power User | Leave a Comment »
Posted by jpluimers on 2019/04/11
Since I was tracking down an issue having to to with generating DIB in a compressed PDF: [Archive.is] wPDF 4 Manual: Compression related properties
Property CompressStreamMethod
By modifying this property you can let the PDF engine compress (deflate) text. By using compression the file will be reasonable smaller. On the other had compression will create binary data rather than ASCII data. While “deflate” produces the smallest files, “run-length” compression is compatible even to very old PDF reader programs.
Property JPEGQuality
wPDF can compress bitmaps using JPEG. This will work only for true color bitmaps (24 bits/pixel) and if you have set the desired quality in this property.
Property EncodeStreamMethod
If data in the PDF file is binary it can be encoded to be ASCII again. Binary data can be either compressed text or graphics. You can select HEX encoding or ASCII95 which is more effective then HEX.
Property ConvertJPEGData
Note: Only applies to TWPDFExport.
If this property is true JPEG data found in the TWPRichText editor will not be embedded as JPEG data. Instead the bitmap will be compressed using deflate or run length compression. It is necessary to set this property to TRUE if the PDF files must be compatible to older PDF reader programs which are incapable to read JPEG data.
Note that EncodeStreamMethod does not do compression, but it does belong here because the encodings result in different PDF sizes.
The settings are not documented in more detail, so here are the enumerations explaining them in a bit more depth:
CompressStreamMethodis of enumeration TWPCompressStreamMethod = (wpCompressNone, wpCompressFlate, wpCompressRunlength, wpCompressFastFlate);
ConvertJpegData is a Boolean; false means no JPEG post processing; true means convert JPEG to bitmap, then useCompressStreamMethod for the bitmap compression.JPEGQuality is of enumeration TWPJPEGQuality = (wpNoJPEG, wpJPEG_10, wpJPEG_25, wpJPEG_50, wpJPEG_75, wpJPEG_100);
wpNoJPEG means bitmaps are left as is- All others will convert bitmaps to JPEG given a quality factor:
- Good examples of JPEG compression results:
–jeroen
Posted in ASCII95, Delphi, Development, Encoding, HEX encoding, Software Development | Leave a Comment »
Posted by jpluimers on 2019/04/11
This so much reminds me of a struggle in the Toshiba Tecra 750CDT era: [WayBack] Delphi Code Monkey: Cool Advanced Troubleshooting Technique – WinDbg.
First about Warren’s issue:
His laptop froze only in Windows 10, but not Windows 7, after doing some debugging work. Display is on, but non-responsive. He ruled out a lot of things, thought it was a video issue, looked for pointers how to research it ending to force memory dumps by keyboard then running WinDbg to further pinpoint the cause.
He solved the issue by removing the Lenovo supplied Intel graphics driver and forcing the Intel HD Graphics 520 OEM drivers onto the system and posted a few interesting links:
Then some history:
Back in the 750CDT days, the problem was the combination of Toshiba using OEM S3 Virge/MX video drivers, Windows GDI and TImageList with a lot of images in them (basically: the component palette).
Result: interrupt freeze of the laptop, so not even mouse or keyword would work.
Solutions:
- use Windows NT, not Windows 95
- disable all S3 hardware acceleration
- use the Toshiba 780 series video drivers
From then on, I’ve never developed on Windows 9x based systems any more, but Windows NT based systems (even though it was much harder to get drivers for all hardware components), this despite the fact that with Windows NT 4, Microsoft video drivers from ring 3 to ring 0 (they were at ring 3 until and including Windows NT 3.51 [Archive.is]). On the one hand the move to ring 0 caused more blue screens, on the other hand made it a lot harder to directly access hardware from user software running at ring 3.
–jeroen
Posted in Development, Power User, Software Development, Windows, Windows 10 | Leave a Comment »
Posted by jpluimers on 2019/04/11
I wrote about bookmarklets before, but more from a usage perspective, not from a programmers one.
From what I understand now is that:
- bookmarklets are basically a special form of URI
- you can use JavaScript in them, but must make sure you do not interfere with existing JavaScript on the page
javascript:(function(){ window.open('https://wiert.me/'); })();
- the URI has limits so,
- browsers can have length restrictions (some around 500 characters) forcing you to put the actual script on-line as externalised bookmarklet (which won’t work on body-less pages)
- you will have to encode special characters (and URI decode them before beautifying existing JavaScript bookmarklets)
My first tries will likely be:
Read the rest of this entry »
Posted in Bookmarklet, Development, JavaScript/ECMAScript, jQuery, Power User, Scripting, Software Development, Web Browsers | Leave a Comment »
The Wiert Corner - irregular stream of stuff 