Plugin Specific Data not set

On 13/10/2017 at 10:40, xxxxxxxx wrote:

Hi,

Our plugin has been saving data to the active document for a couple of years now without issue, however we recently had one client contact us where the data would not write/read.  This is happening on multiple of their workstations running Win10 and C4D v18.

Here is the code we use to save and retrieve the information.

> import c4d
>
> plugin_ID=1000001 #tmp ID for testing
>
>
>
>
> # WRITE
>
> doc=c4d.documents.GetActiveDocument()
>
> container=c4d.BaseContainer()
>
> myString=container.SetString( 9111, "This is my string" )
>
> doc[plugin_ID] = container
>
>
>
>
> # READ
>
> doc=c4d.documents.GetActiveDocument()
>
> container=doc.GetDataInstance()
>
> newString =container[plugin_ID].GetData( 9111 )
>
> print ' STRING: %s' % newString

This has been working successfully for multiple clients except this one specific client.  We also tried changing the read to this:
>
>
>
> # READ
>
> doc=c4d.documents.GetActiveDocument()
>
> container = doc[plugin_ID]
>
> newString = container.GetString( 9111 )
>
> print ' STRING: %s' % newString

This also produced the same result of no data read on their workstations... this does work on ours.

We thought that there may have been a conflicting plugin id but couldn't find evidence of that.  Is there another reason that we are missing that would keep data from being saved to a document?

On a side note the same client says that they do not have the issue in C4D v19.

Any help would be greatly appreciated...
Andrew

On 16/10/2017 at 03:38, xxxxxxxx wrote:

Hi and Welcome to the Plugin Cafe!

This is a known issue that got introduced in R18.057 (R18 SP3). It was fixed in R19.024 (R19 SP1). Unfortunately there's no fix for R18.
The operator [] gives corrupt/invalid containers and this also affects other functions returning containers.
The workaround in R18.057 is to use GetContainer()/GetContainerInstance() instead.

Note the IDs in the range reserved for development (1000001-1000010) should not be used to set data into a document's container.
Because these IDs are only meant for testing and data should be saved into a document using a requested plugin ID.
Also, the IDs within the range 1000000-1001000 are reserved for special document's scene hooks.

On 16/10/2017 at 11:25, xxxxxxxx wrote:

Thanks Yannick! Glad to see I'm not crazy.

All good on the plugin ID btw...  I just slugged that in for demo purposes.

While we're on the container topic, what is the preferred read method:

container=doc.GetDataInstance()
or 
container = doc[plugin_ID]

Thanks,
Andrew

On 17/10/2017 at 04:19, xxxxxxxx wrote:

Originally posted by xxxxxxxx

While we're on the container topic, what is the preferred read method:

container = doc.GetDataInstance()
or
container = doc[plugin_ID]

These lines does not perform the same operation.
doc.GetDataInstance() returns the data container instance for the document. While doc[plugin_ID] returns the plugin_ID sub-container of the document data container.
With the data container instance another line is needed to retrieve the sub-container.

Note doc[plugin_ID] returns a copy of the sub-container so if it is changed, it must be assigned back.

Using the [] operator in Python to access parameters is preferred because it is faster to write and more pythonic. Unfortunately it is broken in R18.057.