Why this TypeError in addValueInput

[RubyRedRick]

I'm getting this error message:

Execute: Traceback (most recent call last):
  File "/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert/ThreadedInsert.py", line 336, in notify
    self.createInputs()
  File "/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert/ThreadedInsert.py", line 127, in createInputs
    self.diameter1Input = self.inputs.addValueInput('diameter1', 'A', linearUnits, self.diameter1)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rick/Library/Application Support/Autodesk/webdeploy/production/86922b6f4858f413cf43758ea700aed2f7ddd881/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/core.py", line 6856, in addValueInput
    return _core.CommandInputs_addValueInput(self, id, name, unitType, initialValue)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: in method 'CommandInputs_addValueInput', argument 5 of type 'adsk::core::Ptr< adsk::core::ValueInput > const &'

Line 127 is 

self.diameter1Input = self.inputs.addValueInput('diameter1', 'A', linearUnits, self.diameter1)

Just prior to executing line 127 the debug console shows:

self.inputs
<adsk.core.CommandInputs; proxy of <Swig Object of type 'adsk::core::Ptr< adsk::core::CommandInputs > *' at 0x3b0f30c00> >
linearUnits
'mm'
self.diameter1
0.5

 I'm at a loss. Can anyone enlighten me?

[Jorge_Jaramillo]

Hi,
Fourth parameter should be a instance of ValueInput.
So replace
self.diameter1
by
adsk.core.ValueInput.createByReal(self.diameter1)

[RubyRedRick]

Now I get

CommandCreated failed: Traceback (most recent call last):
  File "/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert/ThreadedInsert.py", line 160, in notify
    self.createInputs()
  File "/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert/ThreadedInsert.py", line 127, in createInputs
    self.diameter1Input = self.inputs.addValueInput('diameter1', 'A', linearUnits, adsk.core.ValueInput.createByReal(self.diameter1))
                                                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rick/Library/Application Support/Autodesk/webdeploy/production/86922b6f4858f413cf43758ea700aed2f7ddd881/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/core.py", line 22214, in createByReal
    return _core.ValueInput_createByReal(realValue)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: in method 'ValueInput_createByReal', argument 1 of type 'double'

I found some things about swig in google but don't really understand them. 

[Jorge_Jaramillo]

Don't care about swig.
Without your code is very complex to help you.
How is diameter1 defined in your class?

[RubyRedRick]

Well I figured that one out.  I've been refactoring my code. I'm trying to make my custom feature able to produce multiple sub-features at multiple points.  

Jorge, you've been a big help with this so far. I really appreciate it. 

I'm a very experienced developer (over 35 years with C, Smalltalk, Ruby, Lisp, Swift etc.)  My Python knowledge is an inch deep though.

My current problem is that I can't figure out why a for loop to iterate over the selections in a selection input isn't being entered.  Here's a simplified code snippet. The first for loop is just for experimentation, the second is the beginning of the real loop, but what's after shouldn't be important here.

        for i in range(_pointSelectInput.selectionCount):    
            showMessage(f'Creating feature {i}')
        for i in range(_pointSelectInput.selectionCount):
            skPoint = _pointSelectInput.selection(i).entity
            threadedInsertBody = self.makeThreadedInsertBody(skPoint.worldGeometry)

I set breakpoints on lines 1, 2, 3, and 4.  When I stop at the first breakpoint, the debugger shows:

_pointSelectInput
<adsk.core.SelectionCommandInput; proxy of <Swig Object of type 'adsk::core::Ptr< adsk::core::SelectionCommandInput > *' at 0x370373390> >

_pointSelectInput.selectionCount
0
range(_pointSelectInput.selectionCount)
range(0, 0)

When I run it stops on line 3, I run again and it doesn't stop. So neither for loop is being entered and I can't figure out why.

[Jorge_Jaramillo]

It seems to me that _pointSelectInput.selectionCount is 0.
A for loop with "range(0, 0)" doesn't iterate anytime since it means: start "i" at 0 and iterate while "i" < 0.

[RubyRedRick]

ahh I understand range is an open range in python, like a...b in Ruby or a ..<b in Swift.

Now the next mystery when I get to the first line inside the for loop:

skPoint = _pointSelectInput.selection(i).entity

It blows up with 

/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert
_pointSelectInput.selection(i)
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/rick/Library/Application Support/Autodesk/webdeploy/production/86922b6f4858f413cf43758ea700aed2f7ddd881/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/core.py", line 35298, in selection
    return _core.SelectionCommandInput_selection(self, index)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: 3 : invalid argument index

 I then tried both 0 and 1 in the debugger with the same result.

_pointSelectInput.selection(0)
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/rick/Library/Application Support/Autodesk/webdeploy/production/86922b6f4858f413cf43758ea700aed2f7ddd881/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/core.py", line 35298, in selection
    return _core.SelectionCommandInput_selection(self, index)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: 3 : invalid argument index
_pointSelectInput.selection(1)
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/rick/Library/Application Support/Autodesk/webdeploy/production/86922b6f4858f413cf43758ea700aed2f7ddd881/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/core.py", line 35298, in selection
    return _core.SelectionCommandInput_selection(self, index)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: 3 : invalid argument index

So I don't understand why it's blowing up when the index is 0 and the SelectionCount is positive.

[Jorge_Jaramillo]

I'd suggest you to post the piece of code where it fails.
Otherwise it is impossible to guess what the problem could be.

[RubyRedRick]

Well that is the code which is failing.  In a little more context:

    for i in range(0, _pointSelectInput.selectionCount + 1):
            skPoint = _pointSelectInput.selection(i).entity

From the debugger I can see the type of _pointSelectInput, its selectionCount, and the value of i

/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert
_pointSelectInput
<adsk.core.SelectionCommandInput; proxy of <Swig Object of type 'adsk::core::Ptr< adsk::core::SelectionCommandInput > *' at 0x3b5a06190> >

_pointSelectInput.selectionCount
1

i
0

I don't know what other context would help.

[Jorge_Jaramillo]

Hi,

It's  incorrect to add 1 to the superior limit in the range, because in python the first element of an array has index equal to 0.

Try this way:

for i in range(_pointSelectInput.selectionCount):
    app.log(f'{i=} : {_pointSelectInput.selection(i).entity=}')
    skPoint = _pointSelectInput.selection(i).entity

Look for the output of the app.log() call in the Text Command window (you can activate it from File > View > Show Text Commands in the menu):

I hope it can help.

Regards,

Jorge

[RubyRedRick]

That was my goof I was trying to recreate and screwed it up.

ode 

def updateFeature(self):
        for i in range(_pointSelectInput.selectionCount + 1):
            skPoint = _pointSelectInput.selection(i).entity

This is the actual code now.  The same thing is happening.

The VS Code debugger show:

/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert
_pointSelectInput
<adsk.core.SelectionCommandInput; proxy of <Swig Object of type 'adsk::core::Ptr< adsk::core::SelectionCommandInput > *' at 0x3b6159b30> >

_pointSelectInput.selectionCount
1

i
0

and when I go from the breakpoint.  Fusion 360 shows:

Traceback (most recent call last):
  File "/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert/ThreadedInsert.py", line 514, in notify
    self.updateFeature()
  File "/Users/rick/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/ThreadedInsert/ThreadedInsert.py", line 297, in updateFeature
    skPoint = _pointSelectInput.selection(i).entity
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rick/Library/Application Support/Autodesk/webdeploy/production/86922b6f4858f413cf43758ea700aed2f7ddd881/Autodesk Fusion 360.app/Contents/Api/Python/packages/adsk/core.py", line 35298, in selection
    return _core.SelectionCommandInput_selection(self, index)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: 3 : invalid argument index

[Jorge_Jaramillo · Accepted solution]

Please REMOVE the "+1" that you have inside the range() function:

It is not correct that way because will rich 1 in the second iteration, and _pointSelectInput.selection(1) will raise an exception.

You can also in you code can try to get selections with index 0 and 1, just to make a debug, and see which of the two sentences rise an exception.