Category Archives: software

react.net clearscriptv8 compiler error

error
Here’s another one for the error message Googlers. Recently I ran into a nasty build error on TeamCity after adding React.NET Nuget packages to an ASP.NET MVC solution.
Locally everything built just find, but on TeamCity the build failed with the following error message when trying to compile the MVC views:

[AspNetCompiler] ASPNETCOMPILER error ASPCONFIG: Could not load file or assembly 'ClearScriptV8-32.DLL' or one of its dependencies. The specified module could not be found.

Normally you get this type of errors when an assembly can’t be found or isn’t copied to the bin folder for some reason.
In this case it turns out to be more or less the opposite case. The DLL is in the bin folder, but .NET should be ignoring it. Apparently ASP.NET tries to load all DLL files in the bin folder, which it should not do for the v8 ones, making it crash and burn.
The clue came from this StackOverflow post and this blog post. The fix in the blog post is a bit hacky but pointed me in the right direction. The SO answer to change the web.config is spot on.

So the trick is to exclude the offending binaries by listing them in the web.config compilation section:

<configuration>
    <system.diagnostics>
        <trace autoflush="true" />
    </system.diagnostics>
    <system.web>
        <compilation>
            <assemblies>
                <remove assembly="ClearScriptV8-64" />
                <remove assembly="ClearScriptV8-32" />
                <remove assembly="v8-ia32.dll" />
                <remove assembly="v8-x64.dll" />
                       ....
            </assemblies>
        </compilation>

This way the DLL’s are no longer automatically scanned, and your build can nicely go on compiling those MVC views without any trouble.

Photo by strange little woman on stream, cc-licensed.

disable flash and silverlight for safer surfing

Flash, Silverlight and (*gasp*) QuickTime plugins in your browser with the modern web are about as necessary as a horse whip is on a Tesla. Well I might be exaggerating a bit. There are still some useful sites out there that actually use these things. Intranet sites that run on IE only for example, or flaky game sites. But any self-respecting web developer has long ditched them in favor of fancy new HTML5 features.

So why would you still run these things in your favorite browser (Firefox right?) where they only take up extra memory and have a bunch of security problems that might end up causing you trouble. There have been enough exploits for the Flash plugin out there to be sure to actually update those plugins every time they ask for it. Which is about every week if I recall correctly.

Anyway, it’s better to turns those damn things off completely and only turn them on when you hit one of those web sites maintained by a dinosaur. That way you’re stopping that evil hacker from taking over your machine with his Flash exploit and you’re gaining some free performance along the way.

In Firefox you can turn those plugins off in your Tools menu, under Add-ons. Just select “Never activate” and you’ll be fine.
Switch it back to “Ask to Activate” if you’d need them again. That way they’ll never activate by accident either, if you forget to turn it back off.
On Chrome it’s a bit more elaborate, but the option “Let me choose when to run plugin content” sounds like a safe bet instead of having plugin code be ran willy-nilly.
IE? Ha! Who cares right?! For anything else, a properly aimed search query should find you the answer in no time.

Oh, and don’t forget to tweak your Flash security settings if you decide to keep it on after all.

The Firefox add-in screen with all plugins disabled. Just like it should be.

indent selected lines with tab in vim

.vimrcOne thing that annoyed me about using Vim was how much keystrokes it took to indent or un-indent a few selected lines of code. My (probably less than ideal) way of doing that was to go into visual mode, select the lines with the movement keys J or K, then use the keys to change the indenting which are < or >.
To indent another level, pressing dot after this would work.

In Visual Studio or a typical Windows text editor I’m used to simply selecting the lines by holding shift & moving the cursor keys up or down, then pressing TAB to indent and shift-TAB to un-indent.

I’m so used to using the cursor keys for text manipulation that it’s hard to unlearn this, so I was looking for key mappings to do the same thing in Vim.
Luckily this turned out to be rather easy. If you add the following to your vimrc file, you can shift-tab away to indent your code:

" TAB-mappings to allow indenting of selected text instead of using < & >
vnoremap <Tab> >
vnoremap <S-Tab> <

warmup your site or wordpress blog with a single command line statement

mother

GNU Wget is a powerful tool when it comes to downloading files from the web or mirroring sites. It’s command line features can be daunting and not very obvious. With some experimentation, reading the (f..) manual and some Googling you can get it to do some pretty neat tricks for you.
All of that is from the command line too, which is great if you want to schedule this kind of magic or use it in a script.

For example, you might want to warm-up your site or WordPress blog so your homepage and all posts linked from it are present in your cache when a visitor arrives. I’m assuming you are using a caching on your site otherwise this is pretty pointless. For WordPress you can use a caching plugin like W3 Total Cache for example.

With Wget, it goes like this:

wget.exe http://n3wjack.net --spider --no-directories --level=1 --recursive 
         --accept-regex=n3wjack.net/20[1..9].*

The command line parameters (in order) mean something like:

  1. Crawl n3wjack.net.
  2. Crawl it like a spider (follow the links).
  3. Don’t create directories for downloads.
  4. Crawl 1 level deep (so anything linked on the homepage is OK, but don’t go deeper).
  5. Do this recursively (so it actually goes 1 level deep).
  6. Follow only links that start with "/201..." to "/209..." (it’s a regular expression).
    This one is a trick to have it only follow links to blog-posts because my URL scheme begins with the year of the post (2015, 2016, …). It’s good until 2099, which should do the trick I guess. :)
    This way I’m also avoiding it loading all tag, category or page links.

If your site has a different URL scheme you’ll have to change the accept regex pattern to fit your scheme.

You can download Wget from the GNU site. It’s Open Source and is available for Windows, Mac and various Unix systems.
For Chocolatey users, there is a wget package available to install it on your system.

verifying an md5 file hash with just powershell

Tools
You see this possibility for a lot of software downloads but if you’re like me you hardly ever end up doing it: verifying an install file’s MD5 or SHA-something hash.
For Open Source software this is however recommended if you aren’t downloaded from the official mirror (and even then) and certainly if it’s anything related to security (like Keepass for example).

But to verify that MD5 hash you probably need to install yet another piece of software you’re hardly going to need, so you end up not bothering at all.

Hold on a second.

If you have a recent Windows system with PowerShell installed, you probably have all you need to verify that MD5 hash.

Try this in the PowerShell command prompt:

Get-FileHash .\KeePass-2.30-Setup.exe -Algorithm md5

It should print out something like this:

Algorithm       Hash
---------       ----
MD5             CD430EB0F108BB192D2155C68EB7BB48

Which happens to be exactly the MD5 hash code listed on the site for that version of the Keepass installer. Yay!
Without that -Algorithm parameter it prints out the SHA-256 hash by default, but that’s longer and harder to compare visually even though it’s more precise.

That was easy and required no additional software.
Pretty damn sweet.

Photo by Julien Dumont, cc-licensed.

mstsc.exe crashes on Windows 8 (and how to fix it)

Physical View of the Network

When using MSTSC (Microsoft Terminal Server Client aka RDP or Remote Desktop on Windows) to dial into a local HyperV virtual machine on my laptop it often happened that MSTSC crashed on me. When reconnecting afterwards, the VM was running just fine. So it seemed to be an issue on my local machine and not the VM. I assumed it had something to do with HyperV and RDP and didn’t look into it any further (I didn’t need it that much after all).

The exception code I got in my Event Viewer for the crash was 0xc0000005 on ntdll.dll.

But then I kept having this problem so often when connecting to a physical machine in the network it annoyed me enough to Google for a possible solution.
One post pointed me in the right direction (which I can’t find anymore, sorry about that), being that it had something to do with sharing of local resources. In my case I recently activated the option to transfer sound between the remote and my local machine so I could use Skype & Linq.

Turns out that was indeed the culprit. Whenever my remote machine made a sound, my RDP client crashed. Bummer!
Turning off sound transferring to my host machine made the crashes go away. Sweet!

So if you also run into this, try turning off some of those local resources.

It still sucks if you need sound of course, but in my case, I can live with the silence.

Photo by Robin Gist, cc-licensed.

disabling Dell software without uninstalling

Yes, a cat. Cause it's the internet after all.

You know how it goes. You get this new and shiny computer from big computer company X and with it you don’t only get your OEM licensed Windows OS but also some “super handy” tools X happened to install just for you.

Dell is no different so mine come with Dell Data Vault, Dell SupportAssist and Dell Update Service. All of this is (of course) for your own benefit to update your machine to the latest drivers and blah blah blah, even though anything crucial is sent through Windows update anyway.

The downside is that these things are constantly running and using up your precious CPU and memory, while you’ll probably never need them. Ever. Oh, and they also come with some security vulnerabilities apparently, which is always a good reason to kick their butt.

I don’t know what Dell Data Vault even does and don’t care to either (it’s backup software probably). To make things worse it even causes my system to lag sometimes which I notice as my audio glitches up when that happens. I don’t always listen to breakcore you know, so I do noticed that sometimes.

I also noticed that uninstalling Dell Data Service is pointless as (I think) the Dell UpdateService will just reinstall it. Which sucks.

So I see two options.

  1. Uninstalling all Dell related software. This is kinda drastic and you might want that stuff if you need support after all.
  2. Disable the software and prevent it from starting up altogether.

So how do you stop those services from starting up automatically? Here’s how:

  1. On you desktop, press WindowsKey-R, this brings up the Run prompt.
  2. Type services.msc and hit enter. This brings up the list of services installed on your machine.
  3. Look for the Dell ones in the list.
  4. Open them, one by one, and in the General tab select the startup type “Disabled”.
  5. Hit “OK” to save.

How to disable a service from auto-starting.Note that in the screenshot I’m disabling a completely innocent service per demonstration as I don’t have a Dell machine handy with an English version of Windows on it.

From now on those pesky services won’t be wasting your resources anymore, untill the day you might need them again. All you have to do then is go back into the services console and switch the startup type back to Automatic and save.
Then right-click the services in the list and choose “Start”, or simply reboot the machine.

But we’re not quite there yet. There’s still the case of PCDoctor and the SupportAssist client. Those sneaky startups are hidden in the scheduled tasks. You can disable them using the Task Scheduler like this:

  1. Press WinKey-R and type Taskschd.msc, press enter.
  2. In the list of scheduled tasks in the root node you’ll see a “Dell SupportAssistAgent AutoUpdate” or something similar.
  3. Right click the task and choose “Disable”.
  4. Repeat for any other Dell tasks in there.

They don’t all have “Dell” in their name, but if you check the Action tab below the path to the executable will give them away (like in the screenshot). In my case I had some additional PCD (PC Doctor) tasks and one SystemToolsDailyTest task to disable.

Another good tool to disable scheduled tasks if from the CCleaner tools menu, or by using the SysInternals Autoruns tool.The name of the task doesn't tell, but the path to the executable does indicate it's a piece of Dell software.

This worked for me, but as is mostly the case with things you find on the internet… use this info wisely and at your own risk. ;)

Photo by Massimo Regonati, cc-licensed.