In case somebody has the same issue and stumbles into this thread I will
answer my own question.
With the current release (306) of pywin32 it is not possible to create a
COM Record and assign a value of type SAFEARRAY(VT_RECORD) to one of the
record fields.
I have opened a pull request on github (
https://github.com/mhammond/pywin32/pull/2317 ) to add this functionality.
Cheers,
Thomas
On 2024-07-23 07:42 a.m. , Thomas Geppert wrote:
Is it currently somehow possible to create a COM Record and assign a
value of type SAFEARRAY(VT_RECORD) to one of the record fields?
I'm dealing with a COM interface that defines a COM Record of the
following type in the IDL-file.
typedef [uuid(xxxxx)]
struct tagT_RECORD_A {
SAFEARRAY(T_RECORD_B) array_of_records;
<some-more-simple-type-fields>
} T_RECORD_A
The 'T_RECORD_B' is another COM Record type with fields of just simple
types.
I didn't find a way to assign the required SAFEARRAY instance to the
'array_of_records' field of a 'T_RECORD_A' instance.
When I run:
import pythoncom
import win32.client
from win32com.client import gencache, Record
mod = gencache.EnsureModule('{XXXXX}', X, Y, Z)
comp = win32com.client.Dispatch("SomeProgID",
clsctx=pythoncom.CLSCTX_LOCAL_SERVER)
rec_a = Record("T_RECORD_A", comp)
rec_b_1 = Record("T_RECORD_B", comp)
rec_b_3 = Record("T_RECORD_B", comp)
it successfully creates all record instances. However, assigning to
the 'array_of_records' field of the 'T_RECORD_A' instance
raises an exception:
rec_a.array_of_records = [rec_b_1, rec_b_2]
com_error: (-2147024809, 'The parameter is incorrect.', None,
None)
From what I can tell by skimming through the code, it looks like
pywin32 is creating a SAFEARRAY(VT_VARIANT) with
VARIANT elements of type VT_RECORD while the COM-server expects a
SAFEARRAY(VT_RECORD), i.e. COM Record elements.
Cheers,
Thomas
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