Get output of previous node in PDG?

[kiko]

In PDG network, how can I access Outputs (see image) of a preview node withing Python Processor context?

 

In other words how can I access @pdg_output or workItem.output from Python Processor node?

 

Update Feb 23, 2:13 pm

I tried the following but it prints an empty array.

for upstream_item in upstream_items:
    new_item = item_holder.addWorkItem(parent=upstream_item)
    print(new_item.inputResultData)

 

Update Feb 23, 2:24 pm (Solved)

After struggling with this for 4 hours I finally was able to figure it out by reading HDAProcessor code located at C:\Program Files\Side Effects Software\Houdini 18.5.408\houdini\pdg\types\houdini\hda.py

It seams like most of default nodes store outputs with item.addExpectedResultData(...) call.

So to get output values of a previous PDG node

for upstream_item in upstream_items:
    new_item = item_holder.addWorkItem(parent=upstream_item)
    parent_outputs = new_item.expectedInputResultData

I hope it helps someone.

Edited February 23, 2021 by kiko

[papsphilip]

i am struggling with the same problem.

i want to get the output of the current work item but this is not working.

Can you share a hip file?

Edited June 30, 2021 by papsphilip

[papsphilip]

no its not working. i am trying to write a python expression in the file rename to get the output file path and do some string operations later, but its like impossible to get it.

this.index is working but i still haven't figured out how to get the output

 

 

Edited June 30, 2021 by papsphilip

[papsphilip]

after a few days of vacation i used the python processor node and the code the author of the topic posted and everything works.

I was trying to use this code inside a python expression in order to set the filerename "newfilepath" but i don't know what went wrong.