Posted by jpluimers on 2017/02/08
Be sure to read the details in Trying to recover from enhancement software that generates fake input incorrectly – The Old New Thing [WayBack] (much more Old New Think stuff below):
The most insightful part for me was this diagram listing where various methods enter the message pipeline (I added the GetMessage/PeekMessage entry):
Posted in Conference Topics, Conferences, Delphi-Tage.de, Development, Event, Software Development, The Old New Thing, Windows Development | Leave a Comment »
Posted by jpluimers on 2017/01/03
The first implementation of Compiler Explorer supports many versions of the gcc, clang and icc compilers on ARM, ARM64, AVR and x86 targets.
On the left you type your C++ code, on the right you see the resulting assembler code optionally with byte code and colorised so you can correlate the C++ lines with the assembly.
A great way to start the year: learning new things!
Related:
–jeroen
via:
Some videos:
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Posted by jpluimers on 2016/12/27
A long while ago, but still an interesting discussion: Is there a predictable order of execution for Class Constructors? leading to these links:
–jeroen
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Posted by jpluimers on 2016/12/21
Some of the [Wayback] Ken Thompson – Wikiquote entries come from a great [Wayback] 1983 ACM Turing Award Acceptance Lecture [Wayback] “Reflections on Trusting Trust”.
That lecture used to be on http://cm.bell-labs.com/who/ken/trust.html
But it isn’t, and was not in the WayBack machine and neither in the Google Cache [Archive.is] because of the [Wayback/Archive.is] robots.txt. Historic link rot galore!
Edit 20210728: by now it is in the Wayback machine again; the earliest archived copy is from 2001, it also shows that as of april 2015 it is gone from the bell labs server.
The lecture is about [Wayback] compiler viruses and viruses actually did this at least a few times: Wayback: Delphi in 2009 and to [Wayback] XCode in 2015.
A few nice links from [Wayback] ACM Classic: Reflections on Trusting Trust – Google Groups though:
And archived versions of (I hope accurate) copies of the article:
Finally I found a PDF copy of the original ACM prints that Greg Ganger of Electrical and Computer Engineering at Carnegie Mellon University has online. It’s archived too.
–jeroen
Further reading:
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Posted by jpluimers on 2016/12/07
In the continued “floating point code is hard for most software developers” series:
[WayBack] Why does the Windows calculator generate tiny errors when calculating the square root of a perfect square? – The Old New Thing
Because it doesn’t know that it’s a perfect square.
–jeroen
Posted in Algorithms, Conference Topics, Conferences, Development, Event, Floating point handling, Software Development, The Old New Thing, Windows Development | Leave a Comment »
Posted by jpluimers on 2016/09/30
There are odd things with the InitialKeyboardIndicators registry setting. Technet only documents bitflag value 2.
According to the docs it should be a bitflag, but sometimes you encounter InitialKeyboardIndicators value 2147483648 (0x80000000) especially as part of the .DEFAULT profile at HKEY_USERS\.DEFAULT\Control Panel\Keyboard.
The problem I had was having these symptoms:
InitialKeyboardIndicators=0 in my local profile at HKEY_CURRENT_USER\Control Panel\Keyboard.After reading Num Lock problem: Strange number in InitialKeyboardIndicators in Registry, I set both values to 0.
Now that it is 0 in both at HKEY_USERS\.DEFAULT\Control Panel\Keyboard and HKEY_CURRENT_USER\Control Panel\Keyboard, symptoms 4-5 still hold. Strange.
It is not the same problem as Num Lock state not retained after resume from Hybrid Shutdown in Windows 8 and Windows Server 2012.
If it persist, I might just put a script in: [Partially Solved: re-wired keyboard lol] Registry key “InitialKeyboardIndicators” NEVER keeps NumLock ON + ScrollLock ON (6) at startup and reverts back to NumLock ON (2).
–jeroen
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Posted by jpluimers on 2016/09/12
Happy debugging, suckers
Or maybe not…
(yes, this year it’s not on the 13th of September, but the 12th, guess why…)
--jeroen
via: Day of the Programmer – Wikipedia, the free encyclopedia
PS: The oldest reference I could find for define true (rand() > 10) was this one from 20121014:
// Happy debugging, suckers
# define true (rand() > 10)Source: codecrap.com – snippet #6
It reminds me of a 1990s prank I once put in central consts unit of a Turbo Pascal project somewhere way beyond the right margin in a search directory outside of version control:
const True = False; False = not True;
A lot more pranks are at Happy debugging, suckers : ProgrammerHumor – reddit
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Posted by jpluimers on 2016/07/27
It comes down to these cases for XML elements having maxOccurs="1" (which the default for maxOccurs):
nillable="true" will convert from a regular type to a nullable type.minOccurs="0" will add boolean …Specified properties in the generated C# for each element.nillable="true" and minOccurs="0" in an element which gets you a nullable type and a …Specified property.Note I’m not considering
fixedordefaulthere, norattributes(that haveuseinstead ofminOccurs/maxOccurs, but do not allow for nillable) nor larger values ofmaxOccurs(which both xsd.exe and xsd2code regard asunbounded).
From the above, XML has a richer type system than C#, so in XML there are subtle a differences between:
nil in the XML elementHopefully later more text and examples to show how to actually work with this.
Delphi related to minOccurs:
Note that xsd2code.codeplex.com (unlike XmlGen#) has at least two forks at github:
From the specs:
–jeroen
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Posted by jpluimers on 2016/07/19
There is a little trick to disable “Known IDE Packages”: you can stop Delphi from loading one by either making “Value data” of the registry blank, or prepending it with an underscore:
packages that might have been disabled, by checking any string entries where the data has been pre-pended with an underscore OR is blank
[WayBack] Access violation at address 00000000 read of address 00000000, when starting the IDE or opening a project after installing the updates
I’ve pre-pended underscores to some packages in the registry key [HKEY_CURRENT_USER\Software\Borland|Codegear|Embarcadero\BDS|Delphi\#.0\Known IDE Packages] and intend to keep the list below updated over time.
Note that you have to prepend the description with an underscore: it is not sufficient to add these to
[HKEY_CURRENT_USER\Software\Borland|Codegear|Embarcadero\BDS\#.0\Disabled Packages].Empirically, the
Disabled Packagesseem to work only for packages starting withdclin their filename.
Posted in Castalia, Conference Topics, Conferences, Delphi, Delphi XE8, Development, Event, Keyboards and Keyboard Shortcuts, Power User, Software Development | 5 Comments »
Posted by jpluimers on 2016/05/24
The background here was a quick project at a client where many .dproj files were in the same directory, but they suffered from conditional define differences. Which meant that even if they were all using the DEBUG configuration, some defines in the .dproj directories were different therefore poisoning shared .DCU files (as Delphi does not automatically rebuild them when the sources have not changed even though the IDE switched to a new project).
There was no quick possibility to reorganise the project structure (a combination of a version system history being problematic and potentially lots of relative path references in the .dproj and .dpr files could still be broken) so I wanted different “Unit Output Directories” for each project preferably using non-hardcoded project name.
So I tried putting $(PROJECTNAME) in a “Unit Output Directory”. But unlike build-events – where that one has a value – in the Directory it hadn’t.
To cut things short, Uwe Raabe did some spelunking in the .dproj file and found that $(SanitizedProjectName) was recognised so I switched to .\$(Platform)\$(Config)\$(SanitizedProjectName).
Putting it in the OutputDirectory (where your .EXE gets emited) fails for most part. Yes, the .EXE gets put in the right directory. No, the debugger cannot find it as it thinks it needs to use %SanitizedProjectName%. No for TestInsight: it cannot find the EXE either because of the % expansion.
Based on SanitizedProjectName, I did some more spelunking coming with the below list. Remember though:
Only tested for
Win32applications for Delphi XE8
I assembled the list by doing a quick sed on a Delphi XE8 Win32 .dproj file transforming all XML element names to $() form then running it through a uniq like script. After that I added each of them in a “Unit Output Directory” prepended with .\_\ (well I cheated a bit, I did them in groups separated by a back-slash and went back to single items in case of failures. A kind of ‘binary search’).
Ensure the ones you use, are defined before you use them. For example: the definition of SanitizedProjectName need to be in the .dproj file before actually using SanitizedProjectName.
These expand to empty strings:
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The Wiert Corner - irregular stream of stuff 