| StartViewingSession | Scroll | 
REST URL (POST) https://tenant.thereforeonline.com/theservice/v0001/restun/StartViewingSession
SOAP Action (POST) http://schemas.therefore.net/webservices/interop/v0001/messages/IThereforeService/StartViewingSession
Starts a viewing session for a specified document stream or for a file from the upload session. Also creates a thumbnail if required.
Input Message: http://schemas.therefore.net/webservices/interop/v0001/messages/IThereforeService/StartViewingSession
| Element Name | Element Type | Restrictions | Description | 
| â– parameters | 
 | 
 | |
| â–¡ DocNo | xs:int | nillable | The number of the document to be viewed or 0 if a newly uploaded document should be viewed | 
| â–¡ VersionNo | xs:int | nillable | The version of the document to be viewed or 0 if a newly uploaded document should be viewed | 
| â–¡ StreamNo | xs:int | nillable | The StreamNo of an document to be viewed or 0 if a newly uploaded document should be viewed | 
| â–¡ UploadSessionId | xs:string | nillable GUID string template: [\da-fA-F]{8}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{12} | The upload session guid to be viewed or null/undefined if an existing document should be viewed | 
| â–¡ SizeInPixels | xs:int | nillable | Sets the size of the thumbnail in pixels. Nil or 0 (zero) value means that no thumbnail file should be created. | 
| â–¡ ConversionOptions | 
 | nillable | Conversion options that should be applied to the document when converting to HTML. | 
| â–¡ RenderWordComments | xs:boolean | nillable | Enables rendering of review comments in Word documents. | 
| â–¡ Password | xs:string | nillable | Password for encrypted files. | 
| â–¡ ZeroBasedStreamNo | xs:boolean | nillable | Optional bool parameter, that defines if the StreamNo parameter starts at 0 (true) or 1 (false/not-set). | 
Output Message: http://schemas.therefore.net/webservices/interop/v0001/messages/IThereforeService/StartViewingSessionResponse
| Element Name | Element Type | Restrictions | Description | 
| â– parameters | 
 | 
 | |
| â–¡ DocProperties | 
 | mandatory nillable | Document properties of the loaded file. | 
| â–¡ PageSizes | 
 | mandatory nillable | Width and height for every page of the file | 
| ≡ ArrayOfint | 
 | list nillable | |
| ≡ int | xs:int | list | |
| â–¡ TabNames | 
 | nillable | Tab names for document types with tabbed-viewing. | 
| ≡ string | xs:string | list nillable | |
| â–¡ ThumbnailFileData | xs:base64Binary | nillable | Gets binary data of the thumbnail file. Nothing is returned if the thumbnail can not be obtained for a given document. It uses a base64 encoded string in XML messages and a byte array in JSON messages. | 
Legend:
| â– | Not nillable element. | 
| â–¡ | Nillable element. | 
| ≡ | List of elements. | 
| Bold | Mandatory element. |