revisemetadata - throws exception

ushapriya

Hi

I tried to edit one metadata field for an asset ( asset is of type MBAsset, server is MediaBinServer object )

Dim mdata() As MBMetadata
mdata = asset.metadata
For i = 0 To mdata.Length - 1
Response.Write(mdata(i).mName & " " & mdata(i).mValue)
If mdata(i).mName = "Picture title" Then
mdata(i).mValue = "employee"
End If
Response.Write(mdata(i).mName & " " & mdata(i).mValue)
Next
server.ReviseAssetMetadata(asset.mID, mdata)

I get the following exception - Server was unable to process request. --> MBException: The type must match the original. (0x80040449)

If i do not use the revise assetmetadata, the value of the editable metadata is fine within the context of the page, once out of page context, the value is not updated on the Asset. I would think this is by design. However, I am unable to debug any further.

Any help would be appreciated.

Thank you
-usha

msnider

First, if you are only revising one piece of metadata, then you don't need to send the entire array....just a single element array containing the metadata you want to edit.

Second, the list of metadata returned with an MBAsset object is a "displayable" list, in other words certain types of metadata values are converted from their native type to a displayable string value...e.g. booleans are converted from true\false to Yes\No, but the ReviseAssetMetadata call is expecting a boolean. In your case, a string value is just a string value, but since you are passing the entire metadata array back then there is probably another metadata element that contains a converted value which results in the exception.

Also, custom metadata info like name and ID are global to the server so if you know the exact metadata that you want to add or edit you don't need to get the asset and then iterate over it's metadata list. All you would need is the asset ID and the metadata ID. To get the metadata's ID, you can use GetEditableMetadata to retrieve a list of all the server's editable metadata.

Your code should look something like this:


MBMetadata[] metadataArray = new MBMetadata[1];

metadataArray[0] = new MBMetadata();

//Add an Author metadata
metadataArray[0] .mName = "Author";
metadataArray[0] .mID = "{E94A2180-582A-11D4-8104-0050DA27F4FC}";
metadataArray[0] .mValue = "Hawthorne";

server.ReviseAssetMetadata( assetID, metadataArray );

Hope this helps,
Mark