sqlite-s3-query | Python functions to query SQLite files stored on S3 | Database library
kandi X-RAY | sqlite-s3-query Summary
kandi X-RAY | sqlite-s3-query Summary
Python functions to query SQLite files stored on S3
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Top functions reviewed by kandi - BETA
- Wrapper for sqlite3 .
- Wrapper for sqlite3 queries .
- Return the long description of the README . md file .
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QUESTION
In Python ctypes, when, if ever, do you need to manually add the null/zero b'\0'
terminator when passing bytes
to a function that expects null terminated data?
Specifically for the 3 cases (but others welcome)
If the function parameter has been declared with
c_char_p
via its argtypesIf the function has not had its parameter declared via argtypes
Using
...memmove
, if the interface expects a null terminated string at a memory address,
ANSWER
Answered 2021-Dec-27 at 04:49At least in CPython, the internal buffer for a bytes object is always null-terminated and there is no need to add another one. Whether you specify .argtypes
or not, the pointer generated will point to this buffer.
Ref: https://docs.python.org/3/c-api/bytes.html#c.PyBytes_AsString:
char *PyBytes_AsString(PyObject *o)
Part of the Stable ABI.
Return a pointer to the contents of o. The pointer refers to the internal buffer of o, which consists oflen(o) + 1
bytes. The last byte in the buffer is always null, regardless of whether there are any other null bytes....
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