how to hardcode bytes in solidity?

Question

How can I hard code bytes in solidity for a static call?

Ive tried:

bytes memory data = "0xfeaf968c";

bytes memory data = \xfeaf968c";

It works when I manually enter it as an input parameter, while it fails for some reason when I externally call it when its hard coded in this format.

score 6 · Accepted Answer · edited Dec 14 '22 at 01:21

6

You can use the hex keyword to hard-code bytes in your contract.

bytes memory data = hex"feaf968c";

or

bytes memory data = "\xfe\xaf\x96\x8c";

edited Dec 14 '22 at 01:21

Matt Jaf

answered Dec 14 '22 at 00:38

using hex worked, although the second suggestion errored: `ParserError: Expected ']' but got ','` – Matt Jaf Dec 14 '22 at 00:54
`"\xfe\xaf\x96\x8c"` also seemed to work – Matt Jaf Dec 14 '22 at 00:58
updated second example, had to look how i did it in one project :D – Milan Rilex Ristic Dec 14 '22 at 01:12
now the second one is returning `0x00000000000000000000000000000000000000000000000000000000000000fe00000000000000000000000000000000000000000000000000000000000000af0000000000000000000000000000000000000000000000000000000000000096000000000000000000000000000000000000000000000000000000000000008c` – Matt Jaf Dec 14 '22 at 01:15
cause its dynamically-sized byte array, maybe stick to the first one – Milan Rilex Ristic Dec 14 '22 at 01:17
1

I edited the answer and added a solution. I feel we have a strong answer. Thank you so much for your help! – Matt Jaf Dec 14 '22 at 01:24

1 Answers1