Jen Kris wrote at 2023-10-2 00:04 +0200:
>Iwant to write a list of 64-bit integers to a binary file. Everyexample I
>have seen in my research convertsit to .txt, but I want it in binary. I wrote
>this code,based on some earlier work I have done:
>
>buf= bytes((len(qs_array)) * 8)
>
>for offset in range(len(qs_array)):
> item_to_write= bytes(qs_array[offset])
> struct.pack_into(buf,"<Q", offset, item_to_write)
>
>But I get the error "struct.error: embedded null character."
You made a lot of errors:
* the signature of `struct.pack_into` is
`(format, buffer, offset, v1, v2, ...)`.
Especially: `format` is the first, `buffer` the second argument
* In your code, `offset` is `0`, `1`, `2`, ...
but it should be `0 *8`, `1 * 8`, `2 * 8`, ...
* The `vi` should be something which fits with the format:
integers in your case. But you pass bytes.
Try `struct.pack_into("<Q", buf, 0, *qs_array)`
instead of your loop.
Next time: carefully read the documentation and think carefully
about the types involved.
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