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POType mismatch error when using win32com.client.gencache.EnsureDispatch
 

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  1. POType mismatch error when using win32com.client.gencache.EnsureDispatch
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    <p>I'm trying to interact with the COM interface of a proprietary application using the win32com module. I can connect to the interface using the dynamic proxy (win32com.client.Dispatch), which appears to work. However, it would be useful if I could use a static proxy, not least because it populates the help() pages.</p> <p>I can interact normally with the dynamic proxy:</p> <pre><code>&gt;&gt;&gt; import win32com.client &gt;&gt;&gt; aqt = win32com.client.Dispatch("Aquator.Application") &gt;&gt;&gt; db = aqt.LoadDatabase(Folder=r"D:\Shared", Name="AquatorExcel.mdb") &gt;&gt;&gt; db.Name u'D:\\Shared\\AquatorExcel.mdb' &gt;&gt;&gt; db.GetProjectList() (1, (3,), (u'A simple model',)) </code></pre> <p>But when I use the static proxy generated using EnsureDispatch or the makepy script, I get this error:</p> <pre><code>&gt;&gt;&gt; import win32com.client &gt;&gt;&gt; aqt = win32com.client.gencache.EnsureDispatch("Aquator.Application") &gt;&gt;&gt; db.Name u'D:\\Shared\\AquatorExcel.mdb' &gt;&gt;&gt; db = aqt.LoadDatabase(Folder=r"D:\Shared", Name="AquatorExcel.mdb") &gt;&gt;&gt; db.GetProjectList() Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; File "C:\Program Files\Pythonxy\Pythonxy 2.7\Python27\lib\site-packages\win32c om\gen_py\AE9A7F2A-5DD7-4658-B55C-216CAD680889x0x4x3\_Database.py", line 70, in GetProjectList , NameList) File "C:\Program Files\Pythonxy\Pythonxy 2.7\Python27\lib\site-packages\win32c om\client\__init__.py", line 456, in _ApplyTypes_ self._oleobj_.InvokeTypes(dispid, 0, wFlags, retType, argTypes, *args), pywintypes.com_error: (-2147352571, 'Type mismatch.', None, 1) </code></pre> <p>I'm fairly new to COM in general, so I really have no idea where to go from here. What is causing this error and how can I avoid it?</p>
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    1. USSnorfalorpagus
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    1. VO
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      1. VTUpMod
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      1. VTUpMod
    1. CO`GetProjectList` expects two arguments, the first argument is a dynamic array of `long`, the second argument is a dynamic array of `string`. How this translates into COM I have no idea.
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      1. USSteven Rumbalski
    2. CO@StevenRumbalski In VBA, GetProjectList takes two arguments used to return the results. However, Python just returns them like a normal function. If I pass two empty lists it seems to work correctly, i.e. `db.GetProjectList([],[])`. I don't understand why there is a different between the dynamic/static proxies.
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      1. USSnorfalorpagus
    3. COI don't either. I just happened to read the examples I could find online. Since it accepts empty Python lists to return the results, you should name those lists before passing them. That way you will have access to them. `a,b = [],[]; db.GetProjectList(a, b)`.
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      1. USSteven Rumbalski
 

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