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ByteArray—Wolfram Language Documentation

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• See Also
  • ReadByteArray
  • BinaryWrite
  • BinarySerialize
  • StringToByteArray
  • ByteArrayToString
  • BaseEncode
  • BaseDecode
  • Normal
  • ByteArrayQ
  • Encrypt
  • List
  • NumericArray
  • Formats
  • Base64
  • WXF
• Related Guides
  • Binary Data
  • Cryptographic Number Theory
  • Cryptography

ByteArray["string"]

constructs a ByteArray object by extracting byte values from a Base64-encoded string.

• ByteArray stores data in a memory-efficient way, with the total number of bytes used being close to the length of the array.
• When displayed in InputForm, a ByteArray object displays as ByteArray["string"], where "string" encodes the bytes in Base64 encoding.
• In ByteArray[{b₁,b₂,…}], all the byte values b_i should be integers between 0 and 255.
• ByteArray[{}] and ByteArray[""] produce empty byte arrays. »
• StringToByteArray[ByteArray[…]] yields a string by interpreting the contents of a byte array using UTF-8 encoding.
• ExportByteArray[expr,"fmt"] exports an expression via the export format "fmt", giving the result as a byte array. ImportByteArray can be used to convert a byte array to an expression.
• Normal[ByteArray[…]] yields the list of byte values in the byte array.
• Functions such as Length and Equal work with ByteArray objects.
• Functions such as First, Last, Min, and Max yield integer byte values.
• Part works on ByteArray objects, yielding an integer byte value when it returns a single element, and a ByteArray object when it returns multiple elements.

Create a ByteArray from a list of byte values:

Convert back to a list of byte values:

Create a ByteArray from a Base64-encoded string:

Convert to a list of byte values:

ByteArray uses Base64 in InputForm:

Get the length of a ByteArray:

Extract parts of a ByteArray:

Extract a sequence of bytes:

Convert to an ordinary array:

Reverse a byte array:

Read in a "WXF" file as a ByteArray:

Read it in 30 bytes at a time:

Close the incrementally read file:

Export an image as a ByteArray:

Interpret a ByteArray as a PNG image:

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