[python-win32] speed up win32com.client

[Mark Hammond]

On 10/05/2012 6:38 AM, DANIEL POSE wrote:
> I have read about Early Binding but I hadn't tested the line that you
> reference:
> acad= win32com.client.gencache.EnsureDispatch("AutoCAD.Application")
>
> For my surprise, if I replace line:
>
> acad= win32com.client.Dispatch("AutoCAD.Application")
>
> for the line:
>
> acad= win32com.client.gencache.EnsureDispatch("AutoCAD.Application")
>
> I have an error about a missing attribute in the line:
>
> M.append(objeto.InsertionPoint)

Once you use early-binding, the object becomes case sensitive where it 
usually wasn't before.  So I suspect you wanted something like 
"insertionPoint" or some other difference in case.

> The problem here is that if now I go back to use the line:
>
> acad= win32com.client.Dispatch("AutoCAD.Application")
>
> Now pywin32 brokes and I have always the same error in line:
> M.append(objeto.InsertionPoint)
>
> I need to reinstall pywin32 in order to repair the problem.

Yeah, this is unfortunate - once you've generated the early binding 
support, win32com.client.Dispatch will generally be able to use it.  A 
work around without reinstalling would have been to delete the 
win32com\client\gen_py directory.

HTH,

Mark

>
>
>
> 2012/5/8 Tim Roberts <timr at probo.com <mailto:timr at probo.com>>
>
>     DANIEL POSE wrote:
>      > Hello,
>      >
>      > I am writing code to program AutoCAD access from Python using
>     pywin32.
>      > When I need to work with a high number of AutoCAD objects, it is
>      > faster to use vba than python.
>      > Are there some way to speed up python code in order to work faster
>      > with AutoCAD elements?
>      > For example in the next code when I work with 512 AutoCAD blocks:
>      > ...
>      >
>      > The output for the code is the following:
>      >
>      > M_dimension= 512
>      > R_dimension= 262144
>      > t_block1= 4.25343304805
>      > t_block2= 3.88635510938
>      > t_block3= 0.487477319045
>      >
>      >
>      > Then it is faster to work with R than M, even though R is bigger.
>      >
>
>     I hope that's not a surprise to you.  The first loop (block2) involves
>     two calls into the AutoCAD COM object in each iteration.  The second
>     loop (block3) is simply manipulating lists of integers, entirely within
>     Python.
>
>      > Some suggestions for speed up pywin32 code in this example?
>      >
>
>     There isn't really anything here to speed up.  You're just "glue".  The
>     work is being done in AutoCAD.  It is almost impossible for me to
>     believe that Visual Basic does this same loop any faster.
>
>     However, you can certainly try switching to early binding by using:
>         acad= win32com.client.gencache.EnsureDispatch("AutoCAD.Application")
>
>     --
>     Tim Roberts, timr at probo.com <mailto:timr at probo.com>
>     Providenza & Boekelheide, Inc.
>
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