The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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In `System.SysUtils`, `class function TCardinalHelper.Parse` throws errors for valid Cardinal values

Posted by jpluimers on 2016/10/05

Oh nice System.SysUtils.TCardinalHelper.Parse:

class function TCardinalHelper.Parse(const S: string): Cardinal;
begin
  Result := StrToInt(S);
end;

Which means you get this nice EConvertError with message ''4294967295' is not a valid integer value'. with this simple test (which doesn’t even reach the Assert):

uses
  System.SysUtils;

procedure Cardinal_Parse_High_Cardinal_Succeeds();
var
  Expected: Cardinal;
  Value: string;
  Actual: Cardinal;
begin
  Expected := High(Cardinal);
  Value := Expected.ToString();
  Actual := Cardinal.Parse(Value);
  Assert(Expected = Actual);
end;

So I write some unit tests (see below) of which helpers for these types fail in one way or the other:

  • Cardinal
  • NativeUInt
  • Single
  • Double
  • Extended

These work for the boundary cases:

  • SmallInt
  • ShortInt
  • Integer
  • Int64
  • NativeInt
  • Byte
  • Word
  • UInt64
  • Boolean
  • ByteBool
  • WordBool
  • LongBool

 

–jeroen

via: Oh nice, in System.SysUtils: “` class function TCardinalHelper.Parse(const…

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Posted in Delphi, Delphi 10 Seattle, Delphi 10.1 Berlin (BigBen), Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Delphi XE8, Development, Software Development | 5 Comments »

Happy 25th birthday Linux!

Posted by jpluimers on 2016/10/05

Linux turns 25 today: Linux – Wikipedia, the free encyclopedia

Happy birthday!

–jeroen

Posted in *nix, Linux, Power User | Leave a Comment »

TMemIniFile have non-virtual SetStrings procedure. To add support processing of…

Posted by jpluimers on 2016/10/05

TMemIniFile have non-virtual SetStrings procedure.

One of the classic Delphi RTL examples of Delphi team members  not reading Delphi Component Design by +Danny Thorpe 

You can still get it for a few dollars, used: http://www.amazon.com/Delphi-Component-Design-Danny-Thorpe/dp/0201461366

–jeroen

via: TMemIniFile have non-virtual SetStrings procedure. To add support processing of….

Posted in Delphi, Development, Software Development | 1 Comment »

Delphi XE8 [dcc32 Fatal Error] dcc32_F2084_C2359.dpr(30): F2084 Internal Error: C2359

Posted by jpluimers on 2016/10/05

Fails in Delphi XE8 with a nice [dcc32 Fatal Error] dcc32_F2084_C2359.dpr(27): F2084 Internal Error: C2359

It is fixed in Delphi 10.0 Berlin, but of course a C2359 search does not reveal that as Quality Portal is behind a wall. So for future reference the bug: [RSP-13471] Int64 for loops can generate Internal Compiler Error – Embarcadero Technologies. Thanks +Stefan Glienke for mentioning the issue.

program dcc32_F2084_C2359;

type
  TNumber = Int64; // UInt64; // fails too; other numeric types do not fail. Fails in a unit as well.
  TNumbers = TArray;
  TNumberRange = record
  strict private
    function GetLowerBound: TNumber;
  public
    function Numbers: TNumbers;
    property LowerBound: TNumber read GetLowerBound;
  end;

{ TNumberRange }

function TNumberRange.GetLowerBound: TNumber;
begin
  Result := Default(TNumber);
end;

function TNumberRange.Numbers: TNumbers;
var
  lValue: TNumber;
begin
  for lValue := LowerBound to LowerBound do
  ;
end;

begin
end.

–jeroen

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Posted in Delphi, Delphi XE8, Development, F2084, Software Development | 1 Comment »

If you thought you could do multi-threading, then play “The Deadlock Empire” games

Posted by jpluimers on 2016/10/04

Slay dragons, learn concurrency! Play the cunning Scheduler, exploit flawed programs and defeat the armies of the Parallel Wizard.

Source: The Deadlock Empire

Via: Face the dragon. Learn the ropes of concurrent programming. – Lars Fosdal – Google+

Source code is available and focuses on C#; maybe one day I’ll make a Delphi version: deadlockempire/deadlockempire.github.io: The Deadlock Empire: Slay dragons, learn concurrency!

BTW: a great book (with nice illustrations at both github and kernel.org) is Source: Is Parallel Programming Hard, And, If So, What Can You Do About It? [WayBack]

–jeroen

Posted in .NET, C#, Delphi, Development, Multi-Threading / Concurrency, Software Development | Leave a Comment »

Encoding is hard… so how did the single quote become a circumflexed a followed by Euro sign and trade mark?

Posted by jpluimers on 2016/10/04

A while ago (in fact more than a year), I posted Encoding is hard…  go G+ with the below picture.

[Wayback] ftfy (“fixes text for you”, a parody on “fixed that for you”) [Wayback] fixes it, but:

How did the single quote become “’“?

Actually, because of a a common “beautification” of many Office suites (Microsoft and Open alike), the single quote was a special one: a Unicode Character ‘RIGHT SINGLE QUOTATION MARK’ (U+2019) which in UTF-8 is encoded as 0xE2 0x80 0x99.

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Posted in Development, Encoding, ftfy, ISO-8859, ISO8859, Mojibake, Software Development, Unicode, UTF-8, UTF8, Windows-1252 | Leave a Comment »

Fun deciphering thermometers

Posted by jpluimers on 2016/10/03

From a while ago: a Norwegian (left) and German (right) thermometer. In dialect. Because.

Anyone having more of these in other dialects?

Sources:

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Posted in Fun, LifeHacker, Power User | Leave a Comment »

Viewing an USB camera on Mac OS X without mirroring

Posted by jpluimers on 2016/10/03

Even though Photo Booth has an “Auto Flip New Items” option, but that only works for stills, not videos.

I needed it to see without mirroring the images from a DBPOWER 2 Million Pixels Cmos 7M/23FT USB Waterproof HD 6-led Borescope Endoscope Inspection Tube Visual Camera.

What does work are these:

I forget how I bumped into QCamera, but later I found out he posted on apple.stackexchange.com.

–jeroen

Posted in Uncategorized | Leave a Comment »

Ugh, this new Google+ is killing me. I used to be able to click someone’s name in G+ and start a new hangout …

Posted by jpluimers on 2016/10/03

Ugh, this new Google+ is killing me.I used to be able to click someone’s name in Google+ and then start a hangout with them by clicking the hangout icon… – Koushik Dutta (Koush) – Google+ has this nice comment:

Dan Hirsch: You probably have a Google Apps Account. There’s no switch back to old G+ for Google Apps aka GSuite users anymore.

–jeroen

Posted in G+: GooglePlus, SocialMedia | Leave a Comment »

SSD BareMetal cloud servers, Simple and flexible pricing, enjoy a predictable cloud pricing model | Scaleway

Posted by jpluimers on 2016/09/30

So I won’t forget:

SSD BareMetal cloud servers, Simple and flexible pricing, enjoy a predictable cloud pricing model

Source: Pricing BareMetal | Scaleway

They are based in France and host both ARM and x86 servers at very competitive prices.

At the time of writing the cheapest bare metal x86 server has 8 GB or RAM, 4 cores and 50 gigabyte SSD storage at EUR 12/month. VPS are even more affordable. 50 gigabyte extra is EUR 1/month.

Via: C2: Insanely Affordable x86-64 Servers

And:  Günstige dedicated server – Kristian Köhntopp – Google+

–jeroen

 

Posted in Hosting, Power User | Leave a Comment »

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