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Question:

Python 3.6 Import BER into chilkat.CkAsn()

Oct 13 '17 at 04:15

Dear, I do not manage to importer a "bytes" variable into a chilkat.CkAsn() structure. I check with

asn = chilkat.CkAsn()
bytedata = chilkat.CkByteData()
bytedata.append2(payload,len(payload))
success = asn.LoadBinary(bytedata)

But but without success, i receive this error

return _chilkat.CkByteData_append2(self, data, numBytes)
TypeError: in method 'CkByteData_append2', argument 2 of type 'char const *'"

Can you help me, Thanx in advance, Jacky

Answer

This has become a sticky issue since Python 3. When Chilkat was first released, only Python 2.* existed, and it was possible.

I think the best solution for now is to encode the bytes to base64 and use appendEncoded. For example:

import sys
import chilkat
import base64
# Python 3
data = bytes([0x13, 0x00, 0x00, 0x00, 0x08, 0x00])
b64Str = base64.b64encode(data).decode('ascii')
print(b64Str)
# Python 2
#data = ''.join(chr(x) for x in [0x41, 0x42, 0x43, 0x44, 0x45, 0x46])
bytedata = chilkat.CkByteData()
bytedata.appendEncoded(b64Str,"base64")
bytedata.saveFile("out.dat")

Answer

I use the function asn.LoadEncoded(b64Str,"base64") and this OK.

a big thank you, I could never find without your help