[Ironpython-users] How to free memory in ironpython

[Steve Baer]

Do they have a sample in C# for how you should use their SDK? That may help
us figure out if something should be done differently in IronPython.

-Steve

Steve Baer
Robert McNeel & Associates
www.rhino3d.com

On Mon, Nov 7, 2016 at 1:25 PM, Djordje Spasic via Ironpython-users <
ironpython-users at python.org> wrote:

> Hello,
>
> I have an issue. I am using ironpython 2.7 editor called through Rhino 5
> <https://www.rhino3d.com/> application, and I load a single .dll file
> from an application called MapWinGIS
> <https://mapwingis.codeplex.com/releases>. Like so:
>
> dll_filePath = "C:\Program Files\MapWinGIS\Interop.MapWinGIS.dll"
> clr.*AddReferenceToFileAndPath*(dll_filePath)
> *import *MapWinGIS
>
> The problem is that I can only call a particular method *once*.
> If try to do that the second time, the same method returns "False". When
> method works correctly (the first time) it return: "True".
>
> The problem goes away if I restart the Rhino 5 application (and ironpython
> 2.7 editor along with it).
>
>
> Why is this happening? I contacted the developers of upper mentioned
> MapWinGIS application, and they said that they can not replicate this
> behavior and that I should ask this question on ironpython mailing list.
> They suggested that I need to somehow *"free the memory before you do the
> second run of the method"*.
>
> So to make my problem more clear, this is what happens:
>
> If run a script containing the this particular method twice, the first
> call of the method returns "True", the second one "False":
>
> variable1a = "something1a"
> variable1b = "something1b"
> returnedValue1 = MapWinGIS.someClass.*someMethod1*(variable1a, variable1b)
> # returns "True"
>
> variable2a = "something2a"
> variable2b = "something2b"
> returnedValue2 = MapWinGIS.someClass.*someMethod1*(variable2a, variable2b)
> # returns "False"
>
> If run the same script again, both upper calls of MapWinGIS.someClass.someMethod1
> method return "False".
> If I restart my Rhino 5 application, then again the same thing happens:
> "True" is returned on first MapWinGIS.someClass.someMethod1 call, while
> "False" is returned on the second call. If run the script again, then they
> both return "False". For every other run of the script, I get "False" on
> both calls. And this continues until I restart Rhino 5.
>
> I perfectly understand that it is impossible for anyone from Ironpython
> mailing list to know the exact cause of this problem.
>
> But can you at least help me with *"free the memory before you do the
> second run of the method"* part?
>
> I tried deleting all the variables after the first call, calling the
> garbage collector and also removing the .dll file from the list of loaded
> assemblies. Like this:
>
> *import *clr
> *import *gc
>
> dll_filePath = "C:\Program Files\MapWinGIS\Interop.MapWinGIS.dll"
> clr.*AddReferenceToFileAndPath*(dll_filePath)
> *import *MapWinGIS
>
> variable1a = "something1a"
> variable1b = "something1b"
> returnedValue1 = MapWinGIS.someClass.*someMethod1*(variable1a, variable1b)
> # returns "True"
>
> # delete all variables
> *del *dll_filePath; *del *variable1a; *del *variable1b; *del *returnedValue1;
> *del *MapWinGIS
>
> # remove the .dll from the list of assemblies
> *for *i,assembly *in **enumerate*(clr.References):
>     *if *assembly.*GetName*().Name == "Interop.MapWinGIS":
>         clr.References.*RemoveAt*(i)
>         break
>
> # collect garbage
> gc.*collect*()
>
>
>
> dll_filePath2 = "C:\Program Files\MapWinGIS\Interop.MapWinGIS.dll"
> clr.*AddReferenceToFileAndPath*(dll_filePath2)
> *import *MapWinGIS
>
> variable2a = "something2a"
> variable2b = "something2b"
> returnedValue2 = MapWinGIS.someClass.*someMethod1*(variable2a, variable2b)
> # returns "False"
>
>
> But it is not working (I still get the "True" on first method call, and
> "False" on second).
> I also tried to exchange the *variable1a* and *variable1b* with
> *variable2a* and *variable2b*. Or even use the same variables in both
> MapWinGIS.someClass.someMethod1 calls. Still, no improvement.
>
> The MapWinGIS.someClass.someMethod1 that I am calling is actually:
> MapWinGIS.UtilsClass.OGR2OGR
> <https://web.archive.org/web/20160305060402/http://www.mapwindow.org/documentation/mapwingis4.9/class_utils.html#a269f6ab098480f14202a530d7e278407>
> .
> I named it MapWinGIS.someClass.someMethod1 to make it easier for others
> to follow the code. Not sure if this was good idea. If it wasn't I
> apologize.
>
>
> This issue is driving me crazy. I would be very grateful for any kind of
> advice.
> Thank you in advance!
>
>
> Kind regards,
> Djordje Spasic
>
>
> _______________________________________________
> Ironpython-users mailing list
> Ironpython-users at python.org
> https://mail.python.org/mailman/listinfo/ironpython-users
>
>
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