Hi again,

> I tried the method you told me, but the data that I got is '\x00'.
> 
> Like this, vnet_interface_counters(_0=49, vnet_counter_type=1, is_combined=1, 
> first_sw_if_index=0, count=7, data='\x00\x00\x00\x00\x00\x00\x00')
> 
> I don't why this happened.

Ah, yes sorry. Forgot to tell you that it was broken prior to below commit.

You need:

commit ee551988bcce08ad7a15f71fb9d2239b4239ab08
Author: Aloys Augustin <aloys.augus...@polytechnique.org>
Date:   Fri Feb 17 14:55:29 2017 +0100

    Fix vnet_interface_counters API definition

    The api specification had u8 as data type, which caused the python
    binding to fail.
    Fixes VPP-642

    Change-Id: I9ba97959740d44c8f4a12db9356d0d1bcd709a73
    Signed-off-by: Aloys Augustin <aloys.augus...@polytechnique.org>
    Signed-off-by: Ole Troan <o...@cisco.com>


And that changes vnet_interface_counters to a simple and a combined counters 
version.

Sorry, for trickle feeding you information, my brain trashed in the middle of 
the context switch. ;-)

Feel free to put something on the wiki as you go along.

Best regards,
Ole

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