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diff --git a/docs/source/faq/non-printable-snmp-values-apps.rst b/docs/source/faq/non-printable-snmp-values-apps.rst new file mode 100644 index 0000000..cee5166 --- /dev/null +++ b/docs/source/faq/non-printable-snmp-values-apps.rst @@ -0,0 +1,40 @@ + +Garbaged SNMP values (apps) +--------------------------- + +Q. When my PySNMP application prints out fetched values, some of them + come out as a garbage on my screan. Here's my code: + +.. code-block:: python + + for varBind in varBinds: + print(' = '.join([ str(x) for x in varBind ]) + + and the result is: + +.. code-block:: python + + 1.3.6.1.4.1.161.19.3.2.1.63.0 = 50000 + 1.3.6.1.4.1.161.19.3.2.1.4.0 = '\x01\x02\x03\x04' + + The IpAddress type seems to be the only one with this problem. + +A. Always use prettyPrint() method for all pyasn1-based objects -- it + automatically converts ASN1 types to human-friendly form. + +.. code-block:: python + + > > > from pysnmp.proto import rfc1902 + > > > a = rfc1902.IpAddress('1.2.3.4') + > > > str(a) + '\x01\x02\x03\x04' + > > > a + IpAddress('1.2.3.4') + > > > a.prettyPrint() + '1.2.3.4' + > > > rfc1902.IpAddress.prettyPrint(a) + '1.2.3.4' + + See `pyasn1 tutorial <http://pyasn1.sourceforge.net/>`_ for more information + on pyasn1 data model. + |