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S3 OnProgress doesn't work (sample app)

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Posted: 10/15/2014 05:40:15
by ntr1 (Standard support level)
Joined: 02/05/2014
Posts: 77


just trying the various CloudBlackbox products and noticed some other things should be fixed.

The Amazon S3 sample app works fine, except for the progress feedback. In fact, the OnProgress event is fired only too few times (just a couple of times for a 5-6 MB file), so the program is practically freezed during a normal upload.

Are you aware of this? Is there something wrong in the sample app or in the component? Will it be fixed soon ?

Thank you
Posted: 10/15/2014 05:43:36
by Eugene Mayevski (EldoS Corp.)

This is not exactly a bug. The data is sent to the socket in large chunks (1Mb by default) and the progress is reported once for each chunk. Decreasing the chunk size would reduce the speed of transfer.

Sincerely yours
Eugene Mayevski
Posted: 10/15/2014 08:54:51
by ntr1 (Standard support level)
Joined: 02/05/2014
Posts: 77

Hi Eugene,

thank you for your quick reply. Your answers are always useful.

What is exactly the property to set ?

I've found only:


How to use them ? Are they the correct ones ?
Posted: 10/15/2014 09:02:11
by Alexander Ionov (EldoS Corp.)

Best regards,
Alexander Ionov
Posted: 10/15/2014 09:08:42
by Eugene Mayevski (EldoS Corp.)

In HTTPS Client there's a SendBufferSize property but most likely it is not exposed in cloud client components.

Sincerely yours
Eugene Mayevski
Posted: 10/15/2014 09:33:54
by ntr1 (Standard support level)
Joined: 02/05/2014
Posts: 77

Great! The HTTP Client SendBufferSize property can be set, and it seems to work fine!

Instead the two properties


seem to cause an error. It isn't so clear how to use them and with which values.
Anyway, that's not important because I can use the HTTP Client SendBufferSize

Thank you again
Have a nice day
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