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You may use this way to convert the transparent for your current hex colour

For example, you want to set 40% alpha transparency to #000000 (black colour), you need to add 66 like this #66000000. The format is #AARRGGBB so you could use a format like #1C00ff00.

You could also check the full table hex -> transparent colour here https://gist.github.com/lopspower/03fb1cc0ac9f32ef38f4

Ok, the signature container is embedded correctly.

But there are issues with the signature container itself:

• Both in the SignedData.digestAlgorithms collection and in the SignerInfo.digestAlgorithm value you have used the OID of SHA1withRSA, but that is a full signature algorithm, not the mere digest algorithm SHA1 expected there.

• Then the SHA1 hash of the signed bytes is BB78A402F7A537A34D6892B83881266501A691A8 but the hash you signed is 90E28B8A0D8E48691DAFE2BA10A4761FFFDCCD3D. This might be because you hash buffer2 and

  buffer2 has empty contents data (/Contents <>)

  The hex string delimiters '<' and '>' also belong to the contents value and, therefore, must also be removed in buffer2.

Furthermore, your signature is very weak:

• It uses SHA1 as hash algorithm. SHA1 meanwhile has been recognized as too weak a hash algorithm for document signatures.
• It doesn't use signed attributes, neither the ESS signing certificate nor the algorithm identifier protection attribute. Many validation policies require such special attributes.

The example you are using receives the data as a byte array already, but it appends hex representation to the data as string. This is why you get your data in both representations.

You will need to change the example in the file BluetoothLeService.java on line 149. It is currently reading
intent.putExtra(EXTRA_DATA, new String(data) + "\n" + stringBuilder.toString());

and you would need to change it to
intent.putExtra(EXTRA_DATA, new String(data) + "\n");

if you want to receive only the string representation.

Try replacing getchar() with getwchar(); I think you're right that its a Windows-only problem.

I think the problem is that getchar(); is expecting input as a char type, which is 8 bits and only supports ASCII. getwchar(); supports the wchar_t type which allows for other text encodings. "😁" isn't ASCII, and from this page: https://docs.microsoft.com/en-us/windows/win32/learnwin32/working-with-strings , it seems like Windows encodes extended characters like this in UTF-16. I was having trouble finding a lookup table for utf-16 emoji, but I'm guessing that one of the bytes in the utf-16 "😁" is 0x39 which is why you're seeing that printed out.

Since Postman worked, your backend is setup properly. Now on to your frontend.

Axios handles multipart form data if your data is an instance of FormData.

1. In your component you can set a state variable to hold the selected file

Just decode your hex into the raw bytes:

export EGG="\xeb\x11... doesn't actually interpret the escape sequences. You're setting EGG to a string with literal backslashes and hex characters.

When you use export EGG=$(python -c 'print "\xeb\x11..., Python's only job is to interpret the escape sequences. Python receives an input with literal backslashes and hex characters, and performs Python string literal parsing, producing a string with the actual bytes you wanted.

Note that this code relies on using Python 2; Python 3 string handling is very different.

I think u could try this I think u forget use F-string and get the wrong value

Just solving the compiler error (assignment to value) and warning (snprintf misspelled as snprinf) is enough to make the program work