[API][python] only one solidworks instance

Aug 31, 2007 2 Replies
T

Hello,



I start my script convert.py simultaneously in any dos-shells several times. But I get every time the same solidworks instance. I see in the proccess (task) manager only one solidworks.exe Therefore I get for all simultaneous conversions the same output file.



I tested the same code with excel (test_excel.py) and I get many instances of excel in proccess (task) manager. How can I get many instances of solidworks?



Is it a problem of python? Or is it a problem of the Solidworks-COM-Implemention and I get the same problem with an C++ client implementation?



Thanks for your help, Thomas



convert.py import pythoncom pythoncom.CoInitializeEx(pythoncom.COINIT_MULTITHREADED)



sldworks = gencache.EnsureModule('{83A33D31-27C5-11CE- BFD4-00400513BB57}', 0x0, 13, 0) sw = sldworks.ISldWorks(DispatchEx('SldWorks.Application')) swmodel, errors, warnings = sw.OpenDoc6(sourceName, constants.swDocPART, constants.swOpenDocOptions_Silent, "") activeDoc = sw.ActiveDoc retval, errors, warnings = swmodel.SaveAs4(targetName, constants.swSaveAsCurrentVersion , constants.swOpenDocOptions_Silent )



pythoncom.CoUninitialize()



test_excel.py



import pythoncom pythoncom.CoInitializeEx(pythoncom.COINIT_MULTITHREADED)



myExcel = win32com.client.DispatchEx('Excel.Application') myExcel.Visible = 1 Excel = myExcel.Workbooks.Open(excelfile, 0, False, 2) Excel.Saved = 1 Excel.Close() myExcel.Quit() del myExcel del Excel



pythoncom.CoUninitialize()



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T

I found this:

Hello Thomas,

excel registers its COM objects with REGCLS_SINGLEUSE that means one COM object is created per process. In Solidworks it seems that that they register with REGCLS_MULTIPLEUSE, which means on process can serve more than one COM object. Hence you have no chance to get multiple instances running in any COM client.

Stefan

Which leads to this:

formatting link
We know that SW can be started multiple times from the desktop. This is usually not a good thing unless you are running a dual core machine. SW has a much larger footprint than excel. With multiple instances you would quickly run out of resources. And since SW rewrites the registry all the time during use, running multiple instances would seem to be a recipe for disaster.

I have to wonder why you would want to run multiple instances?

TOP

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T

Hello Stefan, thanks for your answer.

I want to run my script convert.py in batch processes parallel. I started following 3 tests parallel: test 1: sourceName = test1.sldprt targetName = test1.step test 2: sourceName = test2.sldprt targetName = test2.step test 3: sourceName = test3.sldprt targetName = test3.step

I got for every test the right taget file (test.step). But the (model) content of all files was the content of the third file. Thomas

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