About the operation after installing the app created by Azure IoT Hub SDK

Question

About the operation after installing the app created by Azure IoT Hub SDK

ima 31

When I create an application that runs with administrator privileges created using the Azure IoT Hub SDK and its installer, and after installation, I run the application and send it to Azure IoT Hub, I get "Object reference not set for object instance". An error will occur.
There is no problem if run it in Visual Studio 2019.
I don't know why the error occurs when the application is installed by the installer.

Sander van de Velde | MVP 36,761 Reputation points MVP Volunteer Moderator

2020-12-21T08:47:07.01+00:00

Hello @ima

Can you show us the code you use or reference the example you try to execute?

(please leave out any secrets)
ima 31 Reputation points

2020-12-21T09:37:11.78+00:00

Thank you for your reply.

There was no problem running the exe created by the Release build of Visual Studio. There was no difference that seems to be directly related to this Release folder and the folder created under Program Files after installation by the installer.

There was no problem if I copied the Release build folder as it was under the Program Files folder and executed it.

Registry when the installer was created or installed? I suspect that there is something wrong with.
Sander van de Velde | MVP 36,761 Reputation points MVP Volunteer Moderator

2020-12-21T10:44:52.38+00:00

Without seeing (parts of) the code, I have to guess.

The application is starting up so deployment seems ok.

The only part which is not fixed could be the application settings.

Are you accessing some configuration file? Can you add some code to show which settings are read?

Which installer are you referring to?
ima 31 Reputation points

2020-12-21T13:55:25.273+00:00

Thank you for your reply.

There was a warning when creating the installer in Visual Studio.
”Unable to find dependency 'MICROSOFT.AZURE.DEVICES.CLIENT'”
I don't know why this warning occurs.

1 answer

Your answer

Sander van de Velde | MVP 36,761 Reputation points MVP Volunteer Moderator

2020-12-21T08:47:07.01+00:00

Hello @ima

Can you show us the code you use or reference the example you try to execute?

(please leave out any secrets)
ima 31 Reputation points

2020-12-21T09:37:11.78+00:00

Thank you for your reply.

There was no problem running the exe created by the Release build of Visual Studio. There was no difference that seems to be directly related to this Release folder and the folder created under Program Files after installation by the installer.

There was no problem if I copied the Release build folder as it was under the Program Files folder and executed it.

Registry when the installer was created or installed? I suspect that there is something wrong with.
Sander van de Velde | MVP 36,761 Reputation points MVP Volunteer Moderator

2020-12-21T10:44:52.38+00:00

Without seeing (parts of) the code, I have to guess.

The application is starting up so deployment seems ok.

The only part which is not fixed could be the application settings.

Are you accessing some configuration file? Can you add some code to show which settings are read?

Which installer are you referring to?
ima 31 Reputation points

2020-12-21T13:55:25.273+00:00

Thank you for your reply.

There was a warning when creating the installer in Visual Studio.
”Unable to find dependency 'MICROSOFT.AZURE.DEVICES.CLIENT'”
I don't know why this warning occurs.

Answer 1

Sander van de Velde | MVP 36,761 MVP Volunteer Moderator

Well, that seems you are missing the https://www.nuget.org/packages/Microsoft.Azure.Devices.Client Nuget package DLL in the folder of your installer.

Can you double-check if this DLL (and all related dependencies) are available for your app?

eg. A .net app without the nuget package:

And with the Microsoft azure devices client Nuget added (including dependencies):

António Sérgio Azevedo 7,671 Reputation points Microsoft Employee Moderator

2020-12-28T23:08:48.497+00:00
@ima did this answer fixed the issue?

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About the operation after installing the app created by Azure IoT Hub SDK

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