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Question

Corrupt image file when reading and downloading from ArcGIS Portal

jlw_tyrens
Contributor
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Hi all!

I have a workflow when I read and download image attachments from ArcGIS Online. I have used the AttributeFileWriter to download the image to a unique filename and it has always worked smoothley.

 

Now I am trying to do the same with image attachments from our ArcGISPortal and it works fine to read and download the files, but when I try to open the files it says that “It looks like we don’t support this file format.”

 

If I go to ArcGISPortal and manually downloads the image file, it works fine.

 

Does anyone recognize this phenomenon?

 

Best regards

Johan

 

4 replies

jkr_wrk
Influencer
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  • jkr_wrkInfluencer
  • April 4, 2022

Could it be that the file downloaded is (.png) for example and you write the file to disk with (.jpg).

 

Or other file format combination?

 

Opening a .jpeg with text editor shows me JFIF within the first 10 characters. Opening a .png shows png within the first 5 characters. I think .tif starts with II*

💡 Did you know... The FeatureWriter is more intuitive. 😏
birgit
Influencer
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  • birgitInfluencer
  • Influencer
  • April 4, 2022

Another option is that the portal is still busy fetching the image while you are already downloading it though this might not be applicable for attachments. I have had something like this with exporting FGDBs from an ArcGIS Portal. I downloaded the FGDB while the portal was still busy exporting my service data to the FGDB, the result was corrupted FGDB files on my pc.

🫠
jlw_tyrens
Contributor
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  • jlw_tyrensContributor
  • Author
  • Contributor
  • April 4, 2022
jkr_da wrote:

Could it be that the file downloaded is (.png) for example and you write the file to disk with (.jpg).

 

Or other file format combination?

 

Opening a .jpeg with text editor shows me JFIF within the first 10 characters. Opening a .png shows png within the first 5 characters. I think .tif starts with II*

Thanks for your reply! There is only jpg files in the feature service. That would have been a smooth solution on my problem..

jlw_tyrens
Contributor
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  • jlw_tyrensContributor
  • Author
  • Contributor
  • April 4, 2022
birgit wrote:

Another option is that the portal is still busy fetching the image while you are already downloading it though this might not be applicable for attachments. I have had something like this with exporting FGDBs from an ArcGIS Portal. I downloaded the FGDB while the portal was still busy exporting my service data to the FGDB, the result was corrupted FGDB files on my pc.

Thank for your reply! I will check into this.

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