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Graham Harris
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 Posted: Wed Apr 25, 2007 11:08 am Post subject: Speed of reading SOAP Responses |
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Hi
I am having to read large XML files that contain a JPEG image. Is there any
way of speeding up the reading of the XML data?
TIA
Graham Harris |
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Jean-Marie Babet
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| Posted: Sat Apr 28, 2007 2:06 am Post subject: Re: Speed of reading SOAP Responses |
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Hello,
| Quote: | I am having to read large XML files that contain a JPEG image. Is there
any
way of speeding up the reading of the XML data?
|
I don't know if you have any profiling data but I suspect that the actually
read itself is as tight as it can be. IOW:
repeat
InternetQueryDataAvailable(Pointer(Context), Size, 0, 0);
if Size > 0 then
begin
InternetReadFile(Pointer(Context), @S[1], Size, Downloaded);
until Size = 0;
If the data is base64 encoded, then there's the overhead of decoding.
If you control both ends it might help to compress the data. Deepak has an
article on this: http://www.agnisoft.com/white_papers/advancedws/default.asp
In general Delphi SOAP is not very good at deserializing data optimally: for
example, for every member of an array, the same RTTI info is
retrieved/computed. I plan to remedy this when I can make interface changes
and have the routine that deseriables an array pass in the RTTI for the
element. Byte[] don't fall in that category though as they take a different
path upfront.
When time allows I'd like to profile other stacks to compare and see how we
do deserializing big byte arrays, large objects, etc.
Cheers,
Bruneau. |
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