PowerApps connection with EventHubs

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Posted on by Community Power Pla... Microsoft Employee

I have added Azure EventHub Connector to the PowerApp.

How can I send and receive events?

I found this, https://www.carlosag.net/PowerApps/Connectors/Event-Hubs

How can these methods be used?

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Building Power Apps

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poweractivate 11,078 Most Valuable Professional on at

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@Anonymous

Use this official documentation instead:

https://docs.microsoft.com/en-us/connectors/eventhubs/

and also, you use it by using them in Formulas.

For example, OnNewEvents becomes available for use as a Function in a formula, and so forth, of course, presuming the Azure Event Hubs Connector was indeed added to the App.

Check if this above helps.

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Community Power Pla... Microsoft Employee on at

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@poweractivate

How do I use the SendEvent method, from the official documentation I get this

Key Type
eventHubName string
ContentData byte
partitionKey string

Can you help with some sample parameters?

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poweractivate 11,078 Most Valuable Professional on at

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@Anonymous

We may have been able to achieve this before actually, but we might have to do a deep check on the answer.

We might have to make a full test about this, and then let you know after a while.

We can find many on this topic:

[EventHubs]: Need assistance while sending data from PowerApps to Event Hubs

How to send data from apps to Azure eventHub
Sample code for EventHub.SendEvent

However, it seems all of them do not have any answer there.

Also, in the conceptual level, a generic answer like to say use a Record, etc. seems like it would not suffice here.

It is a very specific syntax, we would have to do a deep check how we might have gotten it to work before this SendEvent, and also, test this now to make sure this way still works.

In our case, this may take some time, as we may not be able to perform this kind of test right away right now.

So we would also kindly ask the community, if someone else knows how to do this specifically, please go ahead and reply with the answer.

If there is no reply here after a while, we might come back and check here, time permitting of course.

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poweractivate 11,078 Most Valuable Professional on at

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@Anonymous

We had some time to make the test with a full Event Hub Namespace with an Event Hub in it, and using this from a sample Power Apps Canvas App.

After a full test, we find that we can send event successfully from Power Apps Canvas App to the Event Hub like this:

EventHubs.SendEvent("instanceeventhubpowerusersdemo1",{partitionKey:0,ContentData:SamplePdf})

In fact, only ContentData is required for SendEvent (partitionKey is only required with SendEvents)

We can simplify the above to:

EventHubs.SendEvent("instanceeventhubpowerusersdemo1",{ContentData:SamplePdf})

The ContentData must be provided and it must be of data type Blob when sent from Power Apps. So how do you send a Blob out of Power Apps Canvas App? Well, Power Apps has an easy way to simulate a Blob, and that is from a SamplePdf Blob data type that comes included with the PDF Control. Other than this, a Blob may need to be constructed using a value from Power Automate. Other than the potential of using a value from the PDF Control to have a Blob type, we are not sure of another way to construct a Blob data type besides perhaps specifically returning a value using Power Automate that would be interpreted by Power Apps as a Blob data type, and having that called from the Power App (Note that as of this writing, there is no such thing as a native "Blob" function in Power Apps that could convert some other kind of value to a"Blob" data type)

Check example below and network response, and evidence it worked in the Event Hub.

Check if the above helps @Anonymous

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DrEsteban Microsoft Employee on at

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@poweractivate Can you please provide a full example of how you loaded data into the PDF Viewer, then pulled it out again for use with the Event Hub connector? (As Blob format.) For example, if I have a JSON string I want to send to Event Hub, what is the full E2E for doing that?

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Community Power Pla... Microsoft Employee on at

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It would be amazing if you can explain this! @poweractivate ‌‌🙏

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