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Problem with compressed attached files in FORM DocuView

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Posted on by Rudi Hansen

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I am trying to find a way to show attached documents in the DocuView form, but the problem is that the documents are saved in blob storage as compressed files. (This has been done because most of the documents the customer has are XML files, and since they can be compressed quite a lot, it seemed like a good idea to save on storage space.)
So when they are showed on the form they look like this.

So I need to find a way to uncompress the data before its shown in the form.

I have been looking into the code that is run when a record with an attached document is shown in the form, but I have only so far been able to find this.

In this method, DocumentManagement.getDisplayUrl it seems that the URL of the blob storage file is found.
This method is being called from DocumentViewer.createDocument, where the document information is then saved in viewerDocument’s(Class DocumentViewerDocument) parm methods.

And then the saved url is used in the DocuViewerContainer control on the Form DocuView.

So my problem now is I do not know how to change what is shown in that Control?
Do I need to receive the file from the URL, uncompress is and save it again as a temp file in the blob storage, and pass the new URL to the control? And then remove the file when the control is done using it? (Witch seems like a bad solution, since it would take extra time, and there is a chance that the temp file well not be deleted and left behind.)
Or is it somehow possible to change the content of the file before its shown in the control on the form?

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André Arnaud de Cal... 301,069 Super User 2025 Season 2 on at

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Hi Rudi,

I don't have a direct answer for you. There is an example in the standard application. This is in the Data Management import projects. When you import a package, it will be uploaded and extracted where the individual files will be used to import. Probably, you can learn from how this is developed by Microsoft.

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Rudi Hansen 4,075 on at

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Hi Andre.

How does this have anything to do with the DocuViewerContainer control?

Its possible that there is some file handling in this that might be a little similar to the DocValue file handling code, but its not the file handling that is my problem, its the showing of the file in the DocuViewerContainer that I am having problems with.

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Sukrut Parab 71,710 Moderator on at

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The control displays whatever you uploaded. If you upload normal xml file (without doing compression )and try to see it in control , does it show properly ? If yes , then unfortunately you have to do what you have described in the last paragraph of your question

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nunomaia 25 Moderator on at

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What you are trying to achieve is not straightforward.

Attachment preview is not rendered in DocuViewerContainer but rather in Office Online Server. This service don’t decompresses files for creating the preview. If your files are compressed and saved with XML extension, it will render incorrectly because assumes that your ZIP file is a text file.

You can create your rendering service of those compressed files and overwrite the rendering URL.

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Rudi Hansen 4,075 on at

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Hi Nuno.

Ok this sounds interesting, where do you see that its using Office Online Server to render the preview?

And do you have any idea where in the code I might add my own rendering?

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nunomaia 25 Moderator on at

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in DocumentViewer class in createDocument method, the rendering URL will be obtained.

If you open the rendering URL directly in a browser ( don’t forget the matching security token ) you can see the preview result

If is a document type support by Office, preview will rendered using office. Documentation about that docs.microsoft.com/.../configure-document-management

If a type is supported by the browser it will render directly in browser without conversion, only extract data from blob storage and display directly in browser.

You could create your own a preview engine.

The main decision for rendering. WOPI = Microsoft Online Server API or native.

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