Here is the Q&A part for the “Mid” one (I will edit later): Read the rest of this entry »
Archive for the ‘Software Development’ Category
Q&A log for the “RAD-in-Action Webinar Unit Testing in Delphi featuring Nick Hodges”
Posted by jpluimers on 2014/02/12
Posted in Delphi, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Development, Software Development | 2 Comments »
Don’t forget to register: RAD-in-Action Webinar Unit Testing in Delphi featuring Nick Hodges
Posted by jpluimers on 2014/02/12
Do not forget to register for the RAD-in-Action Webinar Unit Testing in Delphi featuring Nick Hodges.
If you cannot watch it live: register anyway, as that will give you the URL for the replay download.
Very interesting stuff (I attended his sessions during the German EKON Conference) and a very entertaining speaker.
He is going to cover a lot in this seminar, and it is a great addition to the material in his Coding in Delphi book (Warren Postma wrote a nice review). You get the electronic edition of the book free when you have Delphi XE5, a hard-copy should be available soon. Read the rest of this entry »
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Posted in Delphi, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Development, Software Development | Tagged: Delphi, nick hodges, Warren Postma | 1 Comment »
Delphi: some notes on running the RADPAServer/PAServer debugger platform assistant
Posted by jpluimers on 2014/02/12
Just as a few small notes as a reminder to myself:
- bash profile shortcuts to the right PAServer or paserver
- PAServer command-line options
- example output of PAServer commands
Lets get started: Read the rest of this entry »
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Posted in Delphi, Delphi XE3, Delphi XE4, Development, Software Development | Leave a Comment »
Chrome does not pick up on time zone changes until the browser is restarted. (via: pellepim / jsTimezoneDetect / issues / #57 – Wrong time zone using Chrome on Mac — Bitbucket)
Posted by jpluimers on 2014/02/11
Just got bitten by Wrong time zone using Chrome on Mac:
Chrome does not pick up on time zone changes until a new tab is opened or the browser restarted.
Actually, it requires a browser restart, as below is the difference between a new Chrome tab and running on jsc on the console: Read the rest of this entry »
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Posted in Chrome, Development, Google, JavaScript/ECMAScript, Power User, Scripting, Software Development | Leave a Comment »
Mac OS X: How do you run JavaScript script through the Terminal? (via: Stack Overflow)
Posted by jpluimers on 2014/02/11
Now I have these aliases in my ~/.bash_profile:
alias jsc='/System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/Resources/jsc'
alias JavaScript='/System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/Resources/jsc'
Now I can use the WebKit jsc from the console.
Thanks User microspino – Stack Overflow for this answer: Read the rest of this entry »
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Posted in Apple, Development, JavaScript/ECMAScript, Mac, Mac OS X / OS X / MacOS, Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, OS X 10.8 Mountain Lion, OS X 10.9 Mavericks, Power User, Scripting, Software Development | 1 Comment »
Need to research: Yahoo Pipes (via: Chris Benard — How to Fix the Dilbert.com RSS Feed)
Posted by jpluimers on 2014/02/11
I’m not sure how to categorize this yet, so it is both under Power User and Development/Software Development.
A long while ago (somewhere mid 2013), the official Dilbert RSS feeds got disabled.
More precisely: initially they pointed each entry in the RSS feed to an antey specific landing page that made you click through the Dilbert.com site to browse for the comic strip. Which is understandable as they want to show you more ads than the RSS feed would.
Later they screwed up those landing pages page so you could not get to the Dilbert site any more, nor see those ads. You get to see only this:
Dilbert will be back soon! We are updating the site for you and will be back shortly. In the meantime, how about laughing at a comic or two on our sister site?
Which makes it a no-loss for Dilbert to re-create an RSS feed, as that will make you see the comics, enhancing at least the Dilbert brand value.
Of course you can go through http://www.dilbert.com/fast manually, but that is outside my feed aggregator realm. Read the rest of this entry »
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Posted in Development, Power User, Software Development | Tagged: Dilbert | 1 Comment »
Google Cast bug tracker (via: google-cast-sdk – Google Cast SDK – Google Project Hosting)
Posted by jpluimers on 2014/02/11
The bug tracker for Chromecast / Google Cast is at Issues – google-cast-sdk – Google Cast SDK – Google Project Hosting.
–jeroen
via: google-cast-sdk – Google Cast SDK – Google Project Hosting.
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Posted in Chromecast, Development, Google, Power User, Software Development | Leave a Comment »
.NET/C#: DBNull explained
Posted by jpluimers on 2014/02/11
The DBNull type is a very special type in .NET. It represents null values in databases, which are slightly different than null values in .NET.
The biggest confusion that people have with it is that it won’t convert to anything. Which means that you see a lot of questions like “System.InvalidCastException: Conversion from type ‘DBNull’ to type” “is not valid”.
You’d think the full name would be System.Data.DBNull, it is actually named System.DBNull. The reason is that various other functionality of the System namespace depend on it, for instance the System.Convert class.
DBNull was already present in .NET 1.x, so it predates nullable types that were introduced in C# 2 / .NET 2.
A null value on the database side will result in a DBNull instance.
If you want to explicitly pass a null value to a database, you use a DBNull.Value, which is a singleton.
Why DBNull
There is a very interestin question/answer series on StackOverflow about this: via .net – What is the point of DBNull? – Stack Overflow.
There are a few good arguments both for and against DBNull.
But the baseline is that DBNull predates the introduction in the .NET framework of genuine nullable types. Both their behaviour is slightly different, so DBNull had to stay.
Which means you have to deal with it every now and then.
Invalid casts
A bit more background on the invalid casts.
It is thrown like this:
throw new InvalidCastException(Environment.GetResourceString("InvalidCast_DBNull"));
from
Convert.DefaultToType();
which is called from the DBNull method
object IConvertible.ToType(Type type, IFormatProvider provider);
All other IConvertible methods are implementated like
bool IConvertible.ToBoolean(IFormatProvider provider) { throw new InvalidCastException(Environment.GetResourceString("InvalidCast_FromDBNull")); }
So these all throw the same exception:
bool IConvertible.ToBoolean(IFormatProvider provider); byte IConvertible.ToByte(IFormatProvider provider); char IConvertible.ToChar(IFormatProvider provider); DateTime IConvertible.ToDateTime(IFormatProvider provider); decimal IConvertible.ToDecimal(IFormatProvider provider); double IConvertible.ToDouble(IFormatProvider provider); short IConvertible.ToInt16(IFormatProvider provider); int IConvertible.ToInt32(IFormatProvider provider); long IConvertible.ToInt64(IFormatProvider provider); sbyte IConvertible.ToSByte(IFormatProvider provider); float IConvertible.ToSingle(IFormatProvider provider); ushort IConvertible.ToUInt16(IFormatProvider provider); uint IConvertible.ToUInt32(IFormatProvider provider); ulong IConvertible.ToUInt64(IFormatProvider provider);
–jeroen
via:
- .net – What is the point of DBNull? – Stack Overflow.
- Handling Null Values.
- SqlDataReader.IsDBNull Method (System.Data.SqlClient).
- Convert.IsDBNull Method (System).
- .net – Checking for DBNull throws a StrongTypingException – Stack Overflow.
- System.Data.SqlTypes Namespace ().
- INullable Interface (System.Data.SqlTypes).
- DBNull Class (System).
- DBNull.Value Field (System).
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Posted in .NET, .NET 1.x, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, .NET 4.5, C#, C# 1.0, C# 2.0, C# 3.0, C# 4.0, C# 5.0, Development, Software Development | Leave a Comment »
Android: manually install Google Play Services 4.2.39 so AllCast and others can stream to Chromecast
Posted by jpluimers on 2014/02/09
Over the years, Google Play Services has started to play a much bigger role, arguably more important than the Android version (also making it impossible to fork Android: Neither Microsoft, Nokia, nor anyone else should fork Android. It’s unforkable. | Ars Technica).
This shows again with the publication of the new Google cast SDK with public Chromecast support release last weak (I think the SDK name being broader than Googlecast means there will be much more to come in the feature).
Though most current Android users are still at version 4.1.32 of the Google Play Services, Google is rolling out a 4.2.39 version to enable that SDK. After it has rolled out to enough devices, then the Play Services library version 15 part of the SDK will be released for Android as well (which will complement the existing support for the iOS and Chrome platforms).
The odd thing: it looks like *some* developers already have this SDK, as AllCast already has been updated and it does not work with Google Play Services 4.1.32, but it does work with Google Play Services version 4.2.39. Below I show you how I tested this, and how to manually upgrade your Android device to use Google Play Services 4.2.39. Read the rest of this entry »
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Posted in Android, Android Devices, Chrome, Chromecast, Development, Google, iOS Development, Mobile Development, Nexus 4, Power User, Software Development | 1 Comment »
Jonas Bandi – Google+ – Blogged: Not happy with Agile, but why?
Posted by jpluimers on 2014/02/09
Yesterday there was this interesting post from Jonas Bandi – Google+ – Blogged: Not happy with Agile, but why?.
The content of his post is the opposite the title suggests: most developers love Agile, but it often is highly incompatible of management in bigger companies.
Well balanced post, much worth reading it.
–jeroen
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Posted in Agile, Development, Software Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 