Hex

From REALbasicWiki

Contents 1 Prototype 2 Description 3 Discussion 4 Sample Code 5 Hex representation of a String

[edit] Prototype

Function Hex(value as integer datatype) as String

[edit] Description

Hex returns a string containing the hexadecimal representation of the passed value.

[edit] Discussion

[edit] Sample Code

dim s as String = Hex(47)

[edit] Hex representation of a String

One sometimes needs to get the hex representation of a binary string; passing a hex representation of an MD5 hash, for example. REALbasic does not have a method for this; here is one that should suffice for most purposes.

Function Hex(s as String, separator as String = "") As String
  #pragma disableBackgroundTasks
  
  static lookupTable() as String = NewLookupTable
  
  dim characters() as String = SplitB(s, "")
  dim hexData() as String
  redim hexData(UBound(characters))
  
  for i as Integer = 0 to UBound(characters)
    hexData(i) = lookupTable(AscB(characters(i)))
  next
  return Join(hexData, separator)
End Function

Private Function NewLookupTable() As String()
  #pragma disableBackgroundTasks
  
  dim table() as String
  for i as Integer = 0 to 15
    dim h as String = Hex(i)
    for j as Integer = 0 to 15
      table.Append h + Hex(j)
    next
  next
  
  return table
End Function