Android Code Snippet [B4X] Hex string to number

Bit.ParseInt will fail if the hex string is larger than the maximum positive int.

We can instead use the ByteConverter library to do it (B4A, B4J: https://www.b4x.com/android/forum/threads/6787/#content, it is an internal library named iRandomAccessFile in B4i)

Sub AppStart (Args() As String)
    Dim i As Int = 0xFB461E4D
    Log(i)
    Log(StringToInt("FB461E4D"))
    'unsigned value:
    Log(StringToUnsignedInt("FB461E4D"))
End Sub

Sub StringToInt(Str As String) As Int
    Dim converter As ByteConverter
    Dim ii() As Int = converter.IntsFromBytes(converter.HexToBytes(Str))
    Return ii(0)
End Sub

Sub StringToUnsignedInt (Str As String) As Long
    Dim converter As ByteConverter
    Dim a(8) As Byte
    Dim i() As Byte = converter.HexToBytes(Str)
    Bit.ArrayCopy(i, 0, a, 4, 4)
    Dim ll() As Long = converter.LongsFromBytes(a)
    Return ll(0)
End Sub