The Wiert Corner – irregular stream of stuff

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

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Archive for the ‘Software Development’ Category

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The Clickjacking attack, X-Frame-Options

Posted by jpluimers on 2015/04/29

Front-end web development isn’t my core area of expertise, but every now and then I am slightly more than the usual spectator and do get involved.

This case it was about helping to prevent The Clickjacking attack by using the The X-Frame-Options response header from RFC 7034.

Lots of people seem to have questions about it: Highest Voted ‘x-frame-options’ Questions – Stack Overflow.

So, from The X-Frame-Options response header:

There are three possible values for X-Frame-Options:

DENY
The page cannot be displayed in a frame, regardless of the site attempting to do so.
SAMEORIGIN
The page can only be displayed in a frame on the same origin as the page itself.
ALLOW-FROM uri
The page can only be displayed in a frame on the specified origin.

–jeroen

via:

Posted in Development, Software Development, Web Development | Leave a Comment »

Some interesting demographics on the G+ Delphi Developers community

Posted by jpluimers on 2015/04/28

Stefan Glienke started some interesting demographics polls on the G+ Delphi community.

Demographics are about group members that actually voted. Which might rule out Delphi programmers not writing English well.

Despite that, I think it actually tells a lot, especially when you read the comments as well.

And it made DavidI provide some background on the geographic distribution: Where in the world are programmers using Delphi? – Blogs.

–jeroen

Posted in Delphi, Development, Software Development | 3 Comments »

CRC: The C Stands for Confusion (quotes from the Dr Dobb’s article)

Posted by jpluimers on 2015/04/28

The CRC algorithm isn’t hard, but choosing the right polynomial and parameters can be tricky especially since there are so many permutations to choose from and lots of libraries have made their own (often incompatible) choices.

 A few quotes

Basics:       Read the rest of this entry »

Posted in Algorithms, Development, Software Development | Leave a Comment »

PowerShell reads: links to coverage of One-Liners about PowerShell features (using, language, etc)

Posted by jpluimers on 2015/04/23

Boy, I wish I had read these PowerShell articles earlier:

  1. PowerShell One-Liners: Help, Syntax, Display and Files.
  2. PowerShell One-Liners: Variables, Parameters, Properties, and Objects.
  3. PowerShell One-Liners: Collections, Hashtables, Arrays and Strings.
  4. PowerShell One-Liners: Accessing, Handling and Writing Data.

Besides being in depth, the articles also contain a ton of examples all in this form:

Action Command Example
Basic help for x Get-Help cmd (cmd is a full name) help Get-ChildItem
Help in separate window Show-Command cmd; then select the help icon Show-Command Get-ChildItem

–jeroen

Posted in CommandLine, Development, PowerShell, Software Development | Leave a Comment »

Delphi XE8 things I learned from the second week of G+ reading

Posted by jpluimers on 2015/04/22

General XE8 news:

Components/tools/libraries updated to XE8:

–jeroen

via:

Delphi XE8 things I learned from the first week of G+ reading « The Wiert Corner – irregular stream of stuff.

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

Coding Kata videos: Bowling game

Posted by jpluimers on 2015/04/22

A long and shorter while ago, I wrote about practicing your coding and test driven development skills:

Here are some Coding Kata videos of the Bowling Game Kata in various languages and environments. Some of them are dumb (no audio) just like good practice usually is. Note: it helps to know a bit about 10 Pin Bowling Scoring rules.

And since I want to learn Haskell and have done a lot of Tic-Tac-Toe demos inthe past:

For more background information:

–jeroen

Posted in .NET, C#, C# 1.0, C# 2.0, C# 3.0, C# 4.0, C# 5.0, C# 6 (Roslyn), Development, Java, Python, RemObjects C#, Ruby, Software Development | Leave a Comment »

Delphi on Windows x64: solution when project compiles fine under IDE, but not using MSBuild

Posted by jpluimers on 2015/04/21

Especially when using Delphi 2007 on Windows x64 system (8.x, 7, Vista, 2012 Server, 2008 Server, …), the Delphi specific .Targets files used by msbuild are simply installed to the wrong location.

A better warning for this is in my BeSharp.net repository: Run-Dependend-rsvars-From-Path.bat thanks to David Millington who wrote this:

If you copy

  • Borland.Common.Targets
  • Borland.Cpp.Targets
  • Borland.Delphi.Targets
  • Borland.Group.Targets

from

  • %windir%\Microsoft.NET\Framework\v2.0.50727

to

  • %windir%\Microsoft.NET\Framework64\v2.0.50727

then building via the command line works.

The rsvars.bat file is correct.

Note that my batch file checks for all target file sets:

Delphi 2007:

  set requiredTargets=Borland.Common.Targets Borland.Cpp.Targets Borland.Delphi.Targets Borland.Group.Targets

Delphi 2009 and up:

  set requiredTargets=CodeGear.Common.Targets CodeGear.Cpp.Targets CodeGear.Delphi.Targets CodeGear.Deployment.Targets CodeGear.Group.Targets CodeGear.Idl.Targets CodeGear.Profiles.Targets
  if %bdsVersion%==8 set requiredTargets=CodeGear.Common.Targets CodeGear.Cpp.Targets CodeGear.Delphi.Targets CodeGear.Group.Targets CodeGear.Idl.Targets
  if %bdsVersion%==13 set requiredTargets=CodeGear.Common.Targets CodeGear.Cpp.Targets CodeGear.Delphi.Targets CodeGear.Deployment.Targets CodeGear.Group.Targets CodeGear.Profiles.Targets

 

–jeroen

via [WayBack] QualityCentral: Project compiles fine under IDE, but not using MSBuild.

Posted in Delphi, Delphi 2007, Delphi 2009, Delphi 2010, Delphi x64, Delphi XE, Delphi XE2, Delphi XE3, Delphi XE4, Delphi XE5, Delphi XE6, Delphi XE7, Development, QC, Software Development | 3 Comments »

Experimenting with HTTP services – UrlEcho and UrlReq

Posted by jpluimers on 2015/04/16

Interesting, especially the reasoning behind them:

UrlEcho permits the requestor to completely define the response it wants to receive, thus giving it the ability to “host” static HTTP resources within URLs themselves. Why is this cool/useful? #

  • You don’t need a Web server to host a simple resource — you just construct a URL and you’re set to go.
  • Since resources are cheap to create and throw away, you can create as many URLs as you want, when you want them.
  • This is especially useful for testing — you don’t want to configure many server-side resources to return hard-coded responses in order to test correct handling of that response. For example, imagine you need many simple iframes to test a JavaScript library, and you don’t want to modify the server hosting the iframes each time you add or change tests. Since you already know what the responses will be, why not define them in the requests and have a simpler testing process? It makes tests easier to maintain no need to modify the server and understand due to response visibility in the tests.

UrlEcho [ed: UrlReq] lets the requestor to wrap any HTTP request any method, with headers and body into a simple GET request with only an URL defined. Why is this cool/useful? #

  • You can make any HTTP request in situations where only a simple GET is possible, or where you can only define just the URL. For example, most systems that provide Web hook callbacks only let you define the callback URL only not the method, headers or body structure.

–jeroen

via: Experimenting with HTTP services – UrlEcho and UrlReq.

Posted in Communications Development, Development, HTTP, Internet protocol suite, Software Development, TCP | Leave a Comment »

Mobile Scanning Apps: A look Into The Dark Side By: Joe C. Hecht – Code4Sale,…

Posted by jpluimers on 2015/04/15

Summary of the dark side:

Every app we tested saved the image in a grayscale JPEG format. Simply put, you scan your document, save it in “space saving” monochrome, then the app up-samples it to a now “space wasting” grayscale format, dials in a low quality lossy compression ratio to make you think you are saving space, and thereby throws away some of the pixels in your scan.

A very interesting read by Joe Hecht. Nothing new for old FAX, TIFF and PDF farts like me. Entertaining and hopefully teaching for the newer generations of software developers.

So if you ever do PDFs of paper scans:

  1. use monochrome
  2. use loss-less compression
  3. look at what FAX machines did back in the days for pixel perfect legal proof documents
  4. know about PDF/A

–jeroen

via Mobile Scanning Apps: A look Into The Dark Side By: Joe C. Hecht – Code4Sale,….

Posted in Development, Software Development | 1 Comment »

Delphi XE8 things I learned from the first week of G+ reading

Posted by jpluimers on 2015/04/15

Components and tools that work with XE8:

Appmethod

--jeroen

Posted in Castalia, Delphi, Delphi XE8, Development, Software Development | Tagged: , , , | 3 Comments »

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