DownloadContent based on filename fails for empty document

We are trying to download content stored in open text based on filename. For regular files with some content in them, this works fine but it fails when we try to download an empty file. Just FYI, uploading empty files is a completely valid scenario in our application - so that cannot be restricted. In particluar, GetNodeByPath() returns 'null' when the file is empty. Is there any other method that we need to use to be able to download empty files or will the node always be null when file is empty?

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Jason_Smith

I'm not sure I understand exactly. GetNodeByPath() does not download the file, it just gets the Node object - but this will return null if the node is not found. Also, I just tried using GetNodeByPath() on a zero byte file and then downloaded it and it worked as expected.

Can you give us some more information or a code snippet explaining where you are having problems?

Thanks.

Rizwan_Khan

We get the node for the file based on its name and then get the ContextID based on node ID. ContextID is later used to make the DownloadContent() call to ContentService.

'node' is 'null' only when the file is empty (the correct fileName and rootNodeID are being passed). So, everything after GetNodeByPath() call basically fails.

Node node = DocMgmtClient.GetNodeByPath(ref docmgmtAuth, rootNodeID, new string [] { fileName });
string contextID = DocMgmtClient.GetVersionContentsContext(ref docmgmtAuth, node.ID, node.VersionInfo.VersionNum);

..... contentService.DownloadContent(ref csAuth, contextID);

Jason_Smith

Interesting...

Can you tell us what version and update of Content Server you are using?

The problem seems to be with getting the node by name...do the 0 byte files actually get created properly?

Another thing to check, are you able to get the Node object for the 0 byte file using the GetNode() call (using its ID)?

Thanks.

Rizwan_Khan

We are using CS V10 Update 7.

Looks like the file is being created correctly. Is there a way to get the node ID through a different call? I only have access to the filename to use for finding the node ID.

Rizwan_Khan

Actually, my initial assessment that the files have been uploaded is wrong. We are having issues uploading empty files. We get the following exception while making UploadContent() call as described in Uploading Documents (C#) documentation https://knowledge.opentext.com/knowledge/cs.dll/fetch/2001/15080935/-15106263/15106294/15106295/16376487/17990637/45500683/upload_C%23.html

Code:

string objectID = contentServiceClient.UploadContent(ref otAuth, contextID, fileAtts, fileStream);

Exception:

Dispatched service DocumentManagement threw exception docManClient.NodeCreationError : Error adding version to 'UploadEmptyFile.txt'. [E675086358].

Jason_Smith

I just checked the release notes for Content Server 10 and we didn't officially support zero byte files until update 10.