ILNumerics mkl_custom dll not found - c#

We have two applications that use ILNumerics and have run into the same issue with both. We use the mkl_custom.dll and during development the application runs fine. The dll in use during development sits in the bin32 folder automatically generated when downloading the ILNumerics from nuget. However when we install the applications we get "Unable to load DLL 'mkl_custom': The specified module could not be found. (Exception from HResult: 0x8007007E".
Here is what we have tried:
Building the application in Any CPU, x86.
Switching the bin32 to include the bin64 dll's and viсе-versa.
Running dependency walker and including all dll's that are needed.
Changing path variable.
We are using ILNumerics 3.3.3.0.

One of the dependencies for mkl_custom is msvcr*.dll. Packing this dll manually may work on some operating systems but not all. Make sure the target system has c++ runtime redistributable package installed.
This installs the msvcr dll correctly. Hopefully this should fix the issue

Related

Why is LoadLibrary failing in some machines when calling a dll using P/Invoke?

I have a .NET application that calls a C++ API using P/Invoke. The C++ dll has a dependency from a third-party dll. That third party dll calls LoadLibrary to dynamically load libeay32.dll, an OpenSSL dependency.
After doing several tests I found out that the .NET application works correctly in Windows 10 but fails in some deployments using Windows 7. The cause of the failure is because the .NET process is not loading libeay32.dll. I tried placing libeay32.dll in the same directory as the process and in the System folder (having in mind the Dynamically load search order) but the failure persisted in Windows 7 32 bits only. Furthermore, if I called the API dll from a C++ console application it worked without issues in all platforms. To solve the problem I called LoadLibrary in the .NET application, before making the P/Invoke calls to the C++ API, and it worked in all target platforms (Windows 10/7 32 and 64 bits).
Why would LoadLibrary fail to load libeay32.dll in Windows 7 but not Windows 10 if called from the C++ dll dependency of the API called using P/Invoke?
Edit
Some notes from comments:
All the compiled assemblies are targeted for x86 architecture.
Before posting the question, I verified that no dependencies files
where missing, using dependency walker.
Likely because the dll is depending on some files that are missing. Use dependency walker and see what files it requires. Check on both systems. The tool will show you in red the missing files. Do not blindly copy the files.See what they are, what runtime or setup is required to deploy them, and deploy them properly.
.Net applications can be built with AnyCPU as their target and run in both 64 and 32 bit modes, but if you choose AnyCPU for your target the operating system will choose one based on it's preference. What this can mean if you have native dependencies is that the library that you're depending on can't be loaded because you're running in the wrong bitness. If you can constrain the application to the bitness you're expecting it might work better.

Why is WinHttpHandler causing "Unable to load DLL 'api-ms-win-core-localization-l1-2-0.dll'" on production server?

We've started using the WinHttpHandler NuGet package in an ASP.NET application. On the development machines it's working fine, and also works on our staging environment. The application targets .NET 4.6.1.
However, on production it throws the following error:
System.DllNotFoundException: Unable to load DLL 'api-ms-win-core-localization-l1-2-0.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
I have googled quite a lot about this problem, but couldn't find any meaningful information about this dll. (I found in forums that some people manually copied the dlls to their production servers when having similar issues, but that doesn't seem to be the proper solution.)
Where is this dll coming from? Should it be explicitly installed?
(On my dev machine I found it in C:\Windows\System32, on our staging machine it's in C:\Windows\System32\downlevel, but I don't know where it's coming from.)
I think you have a problem with API Sets.
That dll is only available for Windows 8 API Sets, and as it is stated on msdn
API Sets rely on operating system support in the library loader to
effectively introduce a namespace redirection component into the
library binding process. Subject to various inputs, including the API
Set name and the binding (import) context, the library loader performs
a runtime redirection of the reference to a target host binary that
houses the appropriate implementation of the API Set.
So my suggestion is to contact the owner of the package and describe in detail the environment in which you are using that package (operating system, Target .Net Framework Identifier, Target .Net Framework Version, etc).
Hopefully they will find and fix the error.
UPDATE: Here is a discussion on GitHub page of the package. The proper long-term solution for this problem is not clear yet.
TLDR: Installing Visual C++ Redistributable for Visual Studio 2015 solves the problem.

OpenCvSharp only starts with all OpenCvDlls

I'm using OpenCvSharp with visual studio 2013. I've installed it through Nuget and it is working fine.
But when I deploy the application it has a DLL directory that has 128M. 128M for x86 and 128M for 64 indeed.
I'm using basically the functions from HighGui and Core. When I remove the DLLs, OpenCvSharp throws an exception when loaded.
I've tried recompile OpenCvSharp without success (this is another question) and even Recompile OpenCV to get smaller DLLs.
Is there any way of loading only the needed DLLs and point out which one can be removed?
The size of your deployment sounds quite large...
When I create a test project with Nuget package OpenCvSharp-AnyCPU 2.4.10 I get:
1.22MB for the net40 assemblies
32MB for the x64 dlls
29MB for the x86 dlls
OpenCvSharp loads the native dlls on demand (i.e. when the C# code needs the native code) so you could remove dlls which your code never uses, but you'd have to check the source or find this out by trial and error.
By default your C# app will build targeting Any CPU which means both sets of dlls are needed, but you could set Platform target: x86 in build properties and just not deploy the x64 dlls.

Bad Image Exception while loading SQLite DLL

I have a project that is build on Any CPU configuration, .Net Framework 2.0, vs2008 with 32bit version of SQLite dll used in it.
Well this works fine on my 32 processor environment, but when i ran this project on 64bit processor environment i experienced
"Could not load file or assembly 'System.Data.SQLite, Version=1.0.66.0, Culture-neutral,
PublicKeyToken=db937bc2d44ff139' or one of its dependencies.
An attempt was made to load a program with an incorrect format."
I even tried adding 64 bit dll on my project but it did not work.
I have tried all the solutions but that did not work for me. Since i am bound to build the project on 32 bit machine, i need a way to run this tool on my 64 bit environment too.
Any suggestions/comments/improvements means a lot for me.
Thanks in Advance.
Compile your application using x86 configuration.
When dealing with dlls like SQLLite that are compiled for x86, your process must be running in x86 mode.
I find these steps can be used to deal with sqlite.
Download NuGet
open cmd and type nuget install System.Data.Sqlite -- note it will create a folder in your current directory
copy dlls from net20 folders to your solution like so.
Add a reference to System.Data.SQLite.dll
Make sure you copy both SQLite.Interop.dlls to your output dir
Hope it helps.

Getting ServiceStack example to work

I am new to ServiceStack. I am testing out the MovieREST example. When I run the project, the Immediate Window shows me this error
"A first chance exception of type 'System.DllNotFoundException' occurred in Mono.Data.Sqlite.DLL"
and no movie list is loading up. So, there is only a blank "Add a new movie" page with some default inputs, everytime I hit Add new movie, the DllNotFoundException will be thrown.
Do I need to install any dependency projects to make it work? I am running it with VS2010, IIS, and Vista 32bit (yup..I know..). Also installed Mono and sqlite 32bit just now blindly, I am not even sure if the project needs them to run. From the code, I can see it is referring to "App_Data/db.sqlite" and References already has sqlite3.dll, I replaced the dll with the 32bit one I download anyway, but still no luck.
Please give me some hints on what I am missing? Thank you.
The Mono.Data.Sqlite.DLL is just a managed wrapper that needs to find the unmanaged sqlite3.dll in order to run (which is what holds the native binary of Sqlite itself).
It looks for this in the /bin directory, to have it deployed there whenever you build you need to copy sqlite3.dll to your project root / and set the Build Action to Content and change the Copy action to Copy if newer.
Ideally you'd want to use the right sqlite3.dll for your architecture (the ServiceStack.OrmLite.Sqlite.Mono NuGet package contains both 32bit / 64bit dlls) although IIS/.NET can work with 32bit unmanaged dlls but will require some tweaking explained here.
Using mixed-mode assemblies
Whilst Mono.Data.Sqlite.DLL lets you run the same .NET app on Mono, if you only want to run Sqlite in Windows you can also use the mixed-mode assemblies that have the unmanaged native sqlite library embedded in the .NET dll. There are 2 different versions available on NuGet:
ServiceStack.OrmLite.Sqlite32
ServiceStack.OrmLite.Sqlite64
Remove any references to existing OrmLite or Sqlite dlls as both of these NuGet packages contain all the Sqlite + OrmLite dlls needed.

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