[Azure Blob Storage] How to list files inside a directory?

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João Heleno

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MVP

Solved

[Azure Blob Storage] How to list files inside a directory?

Question

Forge

Traditional Web

Application Type

Traditional Web

I am trying to see if I can use this component in a project, but I am hitting a wall.

It seems I cannot list blobs inside a directory.

Example:

When I call the ListBlobs action, I see: my-directory, document.docx, and book.xls.

But now, I want to list the contents of my-directory and there is no action available to do that, is there?

The ListBlobs lists everything under my-container. If I want to go deeper in the nested folders I can't.

my-container/

├─ my-directory/

│ ├─ image-inside-directory.png

├─ document.docx

├─ book.xls

Thanks,

João Heleno

12 Oct 2021

Vincent Koning

Champion

Solution

Hi João,

First of all. There are no directories or folder support in Azure Storage Accounts. What you think is an folder is nothing more then the name of a blob containing slashes. So an empty ListBlobs action should return all 3 files (and probably does) namely my-directory/image-inside-directory.png, document.docx and book.xls.

You can use the Prefix parameter to start filtering blobs. So an value of "document" will return document.docx and a value of "my-directory" will return my-directory/image-inside-directory.png.

Please note that in Azure Data Lake Gen 2 there is folder support but this component should not fully support that though.

Hope this helps,

Vincent

12 Oct 2021

João Heleno

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MVP

Hi Vincent,

Thank you for your reply.

I realize that now. In the past, I worked with Azure File Share and I still had the "folder" concept in my mind.

Time to adapt.

Cheers,

João

12 Oct 2021

João Heleno

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MVP

@Vincent Koning

When I use slashes in my blobs, why don't I see the complete blob filename when calling the List action?

I uploaded a blob named "outsystems/file.txt" and when I list my container I am missing "file.txt"...

Without the full name I cannot use this component :) ... and I want to use it!!

13 Oct 2021

Vincent Koning

Champion

Hi João,

That is strange and should not happen. Any change you can share your OML so I can take a look at it? Make sure to remove any connection strings before sharing!

Greetings,

Vincent

13 Oct 2021

João Heleno

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MVP

Thank you for replying, Vincent.

I cannot upload the OML but, there is not much to see.

I pass the connection string, the container name, and the filename.