Cognitive-services-speech-sdk: SDK doesn't work in .NET 4.6.1

[leolorenzoluis]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Create a project with .NET core
2. Change the target framework to net461
3. Add configuration manager for x64 or x32 and target that platform
4. Installed the VC++ distributables (no effect)
5. Try to call a sample code that uses SDK that used to work with .NET core

Expected behavior
It should work like when .NET core was target platform

Version of the Cognitive Services Speech SDK
1.3.1

Platform, Operating System, and Programming Language

• OS: Windows 10
• Hardware - x64
• Programming language: C#

Additional context

System.DllNotFoundException: Unable to load DLL 'Microsoft.CognitiveServices.Speech.core.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
   at Microsoft.CognitiveServices.Speech.Internal.SpeechConfig.speech_config_from_subscription(IntPtr& config, String subscriptionKey, String region)
   at Microsoft.CognitiveServices.Speech.SpeechConfig.FromSubscription(String subscriptionKey, String region)
   at SpeechCognitiveServices.Program.<CallCognitiveServices>d__3.MoveNext()

[leolorenzoluis]

Comparing the two output. It looks like .NET core includes Microsoft.CognitiveServices.Speech.core.dll and .NET Framework output doesn't include that one? I'm not sure if it has any relationship.

[wolfma61]

You are describing the steps you took in Visial Studio?

I had the problem also once. It appears that during build/deployment the dll wasn't copied. I did a 'clean project' and 'rebuild' and it worked ...

hope this helps.

[leolorenzoluis]

Yes I did. I also cleaned and rebuild that time nothing happened.

[leonlj]

I got same issue when I tried the demo in https://github.com/Azure-Samples/cognitive-services-speech-sdk/tree/master/samples/csharp/dotnet-windows/translation-wpf. Is there any workaround ?

[simonemarra]

I'm having the very same problem, but using a plain .netcore console app on a Windows 10 Pro PC. The dll is correctly installed on nuget package folder.
I also tested the command
"dotnet add package Microsoft.CognitiveServices.Speech" --path ".\packages" on the project folder and I see the packages correctly installed, but the same errore appear:

"System.DllNotFoundException: Unable to load DLL 'Microsoft.CognitiveServices.Speech.core.dll' or one of its dependencies: Impossibile trovare il modulo specificato. (Exception from HRESULT: 0x8007007E)"

[jhakulin]

Thanks for feedback, I tried to reproduce the problem with following steps

I am using following versions

• Visual Studio 2017 Enterprise, version 15.9.11
• Microsoft .NET Framework, version 4.7.03190

Repro steps I had:

1. New Project -> Visual C# -> .NET Core -> Console App (.NET Core)
2. Manage Nuget Packages -> search and install "Microsoft.CognitiveServices.Speech" v1.5.1
3. Unload ConsoleApp1 project and edit .csproj file and replace
   netcoreapp2.1
   with
   net461
4. Configuration Manager -> create x64 target
   
   
   
   • Builds OK
   
   
5. Configuration Manager -> create x86 target
   
   
   
   • Builds OK
   
   
6. Add some code which is using Microsoft.CognitiveServices.Speech to the project
   
   
   
   • Builds OK
   
   
7. After running the sample, I can see problem you have reported,

We will investigate.

[jhakulin]

After investigating bit more as a workaround could you please try adding RuntimeIdentifier to your project as follows (.csproj) and let us know does this help ?

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net461</TargetFramework>
    <Platforms>AnyCPU;x64;x86</Platforms>
    <!--<TargetFramework>netcoreapp2.1</TargetFramework>-->
  </PropertyGroup>

  <PropertyGroup Condition="'$(Platform)'=='x64'" Label="Configuration">
    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Platform)'=='x86'" Label="Configuration">
    <RuntimeIdentifier>win-x86</RuntimeIdentifier>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.CognitiveServices.Speech" Version="1.5.1" />
  </ItemGroup>
</Project>

We probably need to fix our samples regarding this.

[simonemarra]

Actually we found the source of our problem: visual studio d++ redistributable!!!

https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

The PC we are using as a deploy machine for speech recognition software didn't have any vc_redist installed. In fact any solution using speech recognition libs (we tested .netcore console app, wpf .net framework) were not able to run correctly. After installing the vc_redist_x64.exe file all the samples where running correctly.

I think you should update the documentation specifying that vc_redist is a MUST HAVE lib to correctly execute the code on any machine running Windows. It may be a obvious, but if you are developing some apps and deploying to third-party machines a reminder could be really useful (we wasted about two working days of development for this missing!!!)

[anbhar]

@simonemarra installing the vc_redist didnt work for me.

@jhakulin adding that to the csproj didnt work either.

I'm using OneClick install.. my WinForms app works fine in debug mode.

Any new ideas?

[jhakulin]

Discussed with @anbhar and the issue there was solved by manually adding Microsoft.CognitiveServices.Speech.core.dll to the application project.

Based on this thread, there is several reasons why the issue might happen.
We will collect information from here and improve our sample projects/documentation on this in coming releases.
Thanks for all feedback

[nrobert]

@jhakulin , where can we get this missing dll?

Edit: got it: need to install the latest Visual C++ Redistributable here https://support.microsoft.com/help/2977003/the-latest-supported-visual-c-downloads

By the way, there is a page in the documentation regarding this dll: https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/ship-application

[anbhar]

@jhakulin , where can we get this missing dll?

@nrobert it should be in the \bin\x64\Debug or \bin\x86\Debug directory based on how you Debug - "Microsoft.CognitiveServices.Speech.core.dll".

A simple "Add -> Existing Item" to the project should do the trick. You'll want to make sure its included in the deployment.

[Electrik97]

@jhakulin , where can we get this missing dll?

@nrobert it should be in the \bin\x64\Debug or \bin\x86\Debug directory based on how you Debug - "Microsoft.CognitiveServices.Speech.core.dll".

A simple "Add -> Existing Item" to the project should do the trick. You'll want to make sure its included in the deployment.

I added this missing dll manually from the \bin\x64\Debug directory , still didn't work.
Visual studio 2017
.Net Framework project
Windows 7 x64
What do you mean its included in the deployment? I'm new to programming

[anbhar]

@Electrik97 You should right click on the project -> Properties -> Publish Section (screenshot attached)

Then click on "Application Files" and scroll down to the Speech.core.dll and change the dropdown to "Included" (screenshot attached)

Once you do that, Visual Studio will include the file when you Publish/deploy the project.

[chlandsi]

@Electrik97: Window 7 is not a supported platform for the SDK. Sorry for the inconvenience.

[Electrik97]

@Electrik97: Window 7 is not a supported platform for the SDK. Sorry for the inconvenience.

Can I use it via REST API? By getting a JWT token? on windows 7 i mean

[wolfma61]

sure - for REST you don't install the SDK, so this will work.

[jhakulin]

Closing the issue, we are going to update sample + documentation in the next release. Let us know if there is new and unidentified issues related to this.

[kiran5362]

Closing the issue, we are going to update sample + documentation in the next release. Let us know if there is new and unidentified issues related to this.

Hello Jhakulin,
i have same issue in Window form application.i have migrated my application to 4.6.1 .NET framework.
but still it shows Microsoft.CognitiveServices.Speech.Core.dll not found exception.Could you please help?
when i tried in new sample window form application it works.but not in existing windows application.

[jhakulin]

@kiran5362 have you tried solutions above in the thread ?
@anbhar do you have ideas for the issue @kiran5362 has?

[anbhar]

@kiran5362 please try the steps in this reply from this post - https://github.com/Azure-Samples/cognitive-services-speech-sdk/issues/176#issuecomment-502737298

If you add Microsoft.CognitiveServices.Speech.Core.dll to the project root manually and make sure its included in the deployment, it should be a definite fix, can you please try that and let us know the result?

[jhakulin]

@kiran5362 were you able to solve your issue ?

[anjsha]

I am facing the same problem. Adding dll manually to the root and setting it to 'copy always' didn't work.
Everything works fine while running the app from VS2019.
Issue pops up while deploying docker container locally as well as when deploying docker image on local service fabric cluster.