2
When you make a RetrieveRequest where the response indicates there are further pages of results that may be retrieved, you'll receive an OverallStatus of "MoreDataAvailable" similar to this response:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" ...
2
It isn't currently possible if you just rely solely on the SOAP API. As from Mark's answer, you can perform a SOQL query on User to get the FullPhotoUrl.
But then you are stuck. If the user has a photo defined the URL will include the photo ID starting with the 729 keyprefix. However, Photo isn't currently exposed via the SOAP API. So you can't retrieve it.
...
1
You can use good old package.xml and ANT for deploying bulk of components (custom placeholder fields in your case) through a single deployment command. All the custom fields should be listed in the package.xml. Refer to this, this & this to explore this option. You can find many blogs and article related to this on the web.
If you want to stick with VS ...
1
There is a hidden field _CustomObjectKey which is used in AmpScript, this field may also be requested for DataExtensionObject:
Thanks to Jonas Lamberty for a hint!
Request:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<fueloauth>secret</fueloauth>
</soap:Header>
<...
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