Get a #var to use in a Python script

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02 Dec 2019 14:51 #151754 by Vmax549
Anyone know how to get a # var into a python script such as:

X_Value = #5061

I do not see any function like GetVar() where it would be used like Test_Value = Getvar(5061)

(;-)TP

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02 Dec 2019 20:54 #151774 by smgvbest

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02 Dec 2019 21:01 #151775 by Vmax549
Unfortunately no it does not help. I read that earlier in my search.

But thanks for the help, (;-) TP

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02 Dec 2019 21:17 #151776 by smgvbest
Do you know how you use the debugger features of your python IDE?
I beelive in another thread a comment was made about 'above my paygrade' so i've not sure of your skillset. please do not take offense, trying to understand skill level.

So actually what are you using to code python?
I use WingIDE and pycharm

the reason I ask is you can with a python debugger you can browse thru what LinuxCNC is passing you back so you can find what your searching for.

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02 Dec 2019 22:56 - 02 Dec 2019 23:00 #151780 by Vmax549
No offense taken (;-) I am not a programmer. I use Gedit to modify scripts. Then run PP and if I get an error I look in teh PathPilot.log to see what it was

From a python script:
check_x = str( 123.345) ## I need numeric value to be <_X>
Then I pass it off to a message to teh operator

BUT I get an error message
File "/home/operator/v2.3.6/python/ui_common.py", line 5291, in send_m1_alert
check_x = str( _x)
NameError: global name '_x' is not defined

AND the error makes sense as _x is a gcode variable and is not present in the Python side

It seems there is a void between Python and teh Gcode side of LinuxCNC where you cannot pass variables across OR at least not from what little I know of it.

(;-) TP
Last edit: 02 Dec 2019 23:00 by Vmax549.

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02 Dec 2019 23:25 #151783 by Vmax549
I had found this code example in a script " if self.params[5600] > 0.0: " and I thought it might be teh answer but it errored as well

check_x = self.params[5061] I used teh 5061 because I know what it is (;-)

Attribute error: Mill instance has no attribute ' params '

(;-) TP

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03 Dec 2019 13:57 - 03 Dec 2019 13:57 #151862 by andypugh
self.params is available if your python imports canon. ie
import emccanon
As seen in stdglue.py

But, you can only import canon in remap python code.

If your script is not part of a G-code remap then would it make sense to re-cast it as one?

I am wondering if it is possible to send an MDI command via the python linuxcnc.command() interface
linuxcnc.command.mdi("(DEBUG, #5601)")
And somehow parse the output. (which might, or might not, appear in the python interface to the error channel). Zero marks for elegance, even if it does work.
Last edit: 03 Dec 2019 13:57 by andypugh.

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03 Dec 2019 16:30 #151888 by Vmax549
It is ODD that as long as EMC has been around that there is NO link between teh 2 sections Python/Gcode to share variables or parameters. I can do half teh function from Gcode but cannot notify teh operator. I can do teh notify operator from teh Python side but cannot pass variable data to them.

I wonder WHY you cannot import emccanon from Python script. Python has no idea what emccanon is.

Catch22 , Close but no Cigar , (;-) TP

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03 Dec 2019 16:57 #151890 by andypugh
I think it is because there are two halves of linuxCNC, and they don't always agree.

There is the interpreter, running in user-space, then there is the realtime code which controls the machine.

Often the interpreter has finished queuing several hours worth of cutting path into the motion controller before the tool even touches the work.
At that point there are two different opinions on the value of the parameters. The interpreter will hold the final value, and the realtime code the initial value.
And there is nothing sending currrent parameter values back to user-space from realtime. In fact I don't think the realtime code even knows what parameters are, it just sees numbers.

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03 Dec 2019 19:07 #151893 by Vmax549
I think I may be able to use remap. I am testing now.

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