Tim, thanks for replying!
VT_CY number doesn’t fit the precision I need (16 digits to the right of the decimal point). It has only 4 digits according to this description: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-oaut/5a2b34c4-d109-438e-9ec8-84816d8de40d The decimal (VT_DECIMAL) has precision up to 28 places ( https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-oaut/b5493025-e447-4109-93a8-ac29c48d018d <https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-oaut/b5493025-e447-4109-93a8-ac29c48d018d>). It is exactly the same as python decimal has. They match to each other exactly and much better than VT_CY and python decimal. So maybe it wasn’t the best solution to automatically convert python decimal to VT_CY variant. Whatever.. what’s done is done. As I understand there is another way (“manual”) to make the property set call. Could you show how to make it? Nikita Lepetukhin ср, 15 апр. 2020 г. в 09:03, Tim Roberts <t...@probo.com>: > > > On Apr 14, 2020, at 7:09 PM, Nikita Lepetukhin <leni...@gmail.com> wrote: > > I use win32com module and everything is ok but I cannot find the way how > to pass VT_DECIMAL variant value to COM object's method. > ... > This is how the interface is described in gencache: > class IProperty(DispatchBaseClass): > CLSID = IID('{0A4C05A0-107B-4A8B-9E34-44ED9B117A25}') > coclass_clsid = IID('{2171DCF1-B70B-4CAB-9EB7-F7FED71956B4}') > > _prop_map_get_ = { > "Value": (0, 2, (12, 0), (), "Value", None), > } > > > That’s a property that returns a VT_VARIANT. > > > In python code I get the object by the following way: > ... > I need to pass here VT_DECIMAL variant (due to data precision > requirements) but it comes to COM object implementation as VT_R8 variant. > I tried to use decimal python type but it comes as VT_CY variant. > > Could you help me to find out how to pass VT_DECIMAL variant from python > to COM? > I would appreciate your help very much! > > > The VT_CY type, the Python decimal type, and the C# decimal type are all > the same — a 128-point fixed point value with 92 bits of precision. That’s > probably what you should use. In order to use VT_DECIMAL, then you > probably can’t use automatic translation. > — > Tim Roberts, t...@probo.com > Providenza & Boekelheide, Inc. > > _______________________________________________ > python-win32 mailing list > python-win32@python.org > https://mail.python.org/mailman/listinfo/python-win32 >
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