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Survey123: How to download images from survey - C#

BillBittenbender

So, does anyone know where to find the documentation on how to download the images, which are attached to a survey? I have been using the API Rest Service to do everything else for my C# application and I assume this might be the same. I will be saving the images to a SQL Server DB. Any assistance would be greatly appreciated.

Thank you,
Bill B

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BillBittenbender

This is done via the queryAttachments() method of the FeatureService in the API Rest Service.

BillBittenbender

Okay, so I was incorrect. QueryAttachments() only brings back the data pertaining to the images (length, datatype, name, etc.). I did also find that using ...FeatureServer/0/17/attachments/3?token=...., I can actually view the image. Not what I want though. I need to be able to bring the image back at least in a byte []. I am doing this in C# .net. Help, Anyone???

BillBittenbender

I think I figured it out. By setting the parameter f = json, I was able to use WebClient.DownloadData("url") into a byte[]. I still have further testing to do.

CraigSchellenbach1

Are you still working on this issue? I imagine you are doing something similar to what I am working on. I was able to get the images from Survey123 int a byte[] by doing the following.

var response = wb.UploadValues(ServiceUrl + "query", "POST", request);
byte[] vs = response;

BillBittenbender

Hi Craig,

I was able to figure this out after I started going through the "response" and looking for the data I needed. Each of the surveys could have multiple images attached. So, I needed to iterate through the Json response of a "queryattachments" request based on a Survey "Id" and then do an "attachments" request based on the "objectid" associated with each image. Thank you for replying. It's good to know someone else is out there working on the same thing.

Bill

CraigSchellenbach1

Bill,

How were you able to setup the Survey feature layer for queryAttachements? I can't seem to locate where I turn that on. I am using version 10.51

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