Barry, I cannot believe someone else (other than me) finally had this exact same issue (pretty much in the same context too)!
I always assumed it was something else I had done that was responsible for the memory leak (I had a multi-threaded program with this issue). I'm in the process of changing my program to be event-driven (OnDataChange instead of SyncRead). This doesn't really solve the problem, but will hopefully avoid it. Gerrat. ________________________________ I have run across what I believe may be a shortcoming with win32com when trying to call functions that expect one-based indexed arrays as input. The function I'm trying to invoke which demonstrates the problem is defined in my documentation as follows: HRESULT SyncRead( [in] SHORT Source, [in] LONG NumItems, [in] SAFEARRAY(LONG) * ServerHandles, [out] SAFEARRAY(VARIANT) * Values, [out] SAFEARRAY(LONG) * Errors, [out,optional] VARIANT * Qualities, [out,optional] VARIANT * TimeStamps); In Python, this looks like: server_handles = [16384,16385] num_items = 2 values, errors, qualities, timestamps = groups.SyncRead(2, num_items, server_handles) The num_items parameter is supposed to tell the function the total number sever_handles being passed in. Anyway, the above code always throws a com exception and fails. I am assuming this issue is due to the SyncRead function using one-based indexing for its array collection. However, if I append an extra "dummy" argument to the beginning of the server_handles list, it will always work. server_handles = [0, 16384,16385] num_items = 2 values, errors, qualities, timestamps = groups.SyncRead(2, num_items, server_handles) The above example is a very poor solution since it appears to produce a slow memory leak in my application. Every 10 to 12 times the SyncRead call is invoked using the exact same server_handles, memory consumption increases by 4kb. This memory leak problem does not happen when called from VB. As an amusing test, I tried setting the variables passed to the function as follows: server_handles = [0, 16384, 16385, 0, 0, 0, 0, 0, 0, 0, 0, 0] num_items = 2 This makes an even bigger memory leak, leading me to believe any extra elements passed in the list beyond the num_items passed will always be allocated but never freed. Does Mark or anyone else know how to correctly pass a collection to a COM call using one-based indexing that won't cause a mem leak? I couldn't find any mention of this issue in the Python Win32 book other than an Excel example which didn't seem to apply. -BB
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