@m_adam Thank you for all the info. I will mark my question topics as such going forward and mark it as solved when it is.

I'm having difficulties getting a string that I can serialize from the method you shared. Here is my code:

    doc = c4d.documents.GetActiveDocument()
    obj = doc.GetActiveObject()

    uid = obj.FindUniqueID(c4d.MAXON_CREATOR_ID)

    print(uid)
    #prints a blank line
    print(uid.__str__())
    #prints a blank line
    print(str(uid))
    #prints a blank line
    print uid.__len__()
    #prints 16

Could you please teach me how to get a string I can store?

@zipit Great, thank you. I'll give that a shot.

@zipit Thank you for the response.

I do not want to mark these myself. I shared the link as a method I have tried.

I would like to find the already existing unique IDs that Cinema 4D gives objects and tags in a scene (if they exist).

Thanks!

Hi,
I am storing serialized data about my objects with animation tracks using the identifier from method GetGUID(). For the tags with animations I am having trouble as there is no unique ID for the BaseTag class:

AttributeError: 'c4d.BaseTag' object has no attribute 'GetGUID'

I have learned how to mark the tags' BaseContainers from this legacy post to identify them, but I want to store them serialized as unique IDs along with their animations.

Can anyone help me to do this? Thanks!

@m_magalhaes said in Writing data to the .c4d file:

You can also use del that is pythonic

    bc = doc.GetDataInstance().GetContainerInstance(MyUniqueId)
    bc.RemoveData(2000)
    #del (bc[2000])

Wonderful, @m_magalhaes , thank you so much!

@m_magalhaes Thanks, Manuel.

How would I delete the data of an individual sub-BaseContainer in the case of your script?

I've tried several methods below but the doc[MyUniqueId][1000] still shows data in the print call.

bc = doc.GetDataInstance().GetContainer(MyUniqueId)
print bc.RemoveData(1000)
# True 
print doc[MyUniqueId].RemoveData(1000)
# True
doc[MyUniqueId].FlushAll()
    
print doc[MyUniqueId][1000]
#hello

I was able to delete all of the data this way, but what if I want to keep the data in subBc[2000]?

docBC.RemoveData(MyUniqueId)

Thank you!

@Cairyn I'm a little embarrassed, but you're right. I wasn't saving properly (I think just saving the Script) then going to the document in Recent Files. I'll mark this solved.

Thank you all - @Cairyn ,@zipit ,@m_magalhaes .

@m_magalhaes Hi Manuel and thank you for this contribution. This code's data, however, is not persisting when I do the following:

• run the script to set the data
• close and reopen the document.
• comment out the lines setting the data (lines 11-19)
• run the script to print the data

Instead I get this error for doc[MyUniqueId]:

TypeError: 'NoneType' object has no attribute '__getitem__'

Also, is MyUniqueId supposed to be the PLUGIN_ID? Why is that not being used?

Thanks!

Not sure if this matters, but my ultimate goal would be to save JSON data in the BaseContainer.