Mark Hammond wrote:
>> can anybody tell me the meaning of the binary string
>> representation of a
>> PR_ENTRYID, as obtained by calling GetProps() on a mail item?
>
> Its a binary value that is unique for the item (but only unique within the
> store - PR_STORE_ENTRYID will tell you the store ID)
>
>> I get e.g. the following IDs:
>>
>> 000000003C437E32AFD11C49ABB743DDE9EDFE6BE4652000
>> 000000003C437E32AFD11C49ABB743DDE9EDFE6B24602000
>> 000000003C437E32AFD11C49ABB743DDE9EDFE6B845F2000
>> 000000003C437E32AFD11C49ABB743DDE9EDFE6B44612000
>> 000000003C437E32AFD11C49ABB743DDE9EDFE6BA4672000
>> 000000003C437E32AFD11C49ABB743DDE9EDFE6B64652000
>> ^^^^^^
>
> You are getting them via the client libraries, which has already encoded the
> binary data as hex for you. If you were to get the property directly from
> "extended mapi", you would get a string holding binary data.
I forgot to mention that. I used the extended mapi and converted it
using HexFromBin.
>>
>> In case there isn't any meaning:
>> I noticed that most of the data is equal for all messages of one mail
>> folder.
>> Only the characters marked above (3 bytes) are unique per
>> item. Is it always
>> like that?
>> The reason I'm asking is, that I'd like to have a numeric
>> representation of
>> those IDs. So, do you think int('0x'+id[40:46],16) would be ok?
>
> The values above already *are* a hexadecimal value - you can't safely change
> any part of it.
I do not want to change it. I hoped that the extracted part might be
enough to identify a message within one message store.
>>>> int("000000003C437E32AFD11C49ABB743DDE9EDFE6B64652000", 16)
> 344044589573578334092534486689392272954676813824L
>
> Its a very large number to be sure, that that it the "numeric ID".
Indeed big. For my purpose I need an int though, not a long int. That's
the reason why I tried to extract a smaller part. But if you don't
consider it safe I will use a mapping dict to convert between the EIDs
and my own ids.
Thanks, Christian
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