B4X

Demonstrates how to Handle Large Integers in JSON

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Demonstrates how to handle large integers in JSON. (Integers larger than what can fit in a 32-bit signed integer.) B4X

Dim success As Boolean = False

'  Let's say your JSON has this:

'  {
'  	"id": 20000000001234567
'  }

Dim json As ChilkatJsonObject
json.Initialize

success = json.LoadFile("qa_data/json/large_int.json")
If success = False Then
    Log(json.LastErrorText)
    Return
End If


'  The integer is too large for a 32-bit signed integer that is returned by IntOf.
'  The result will be something that wrapped around and could be negative.
'  In this case it would be: -543893881
Dim id As Int = json.IntOf("id")
Log("id: " & id)

'  The solution is to read the integer value as a string, and then use the features in your programming language
'  to convert from a string to a 64-bit integer.
'  
'  Alternatively, you may wish to simply hold the value as a string.  If, for example, the integer simply references
'  an order ID, an account ID, etc., then there's no need to convert to an integer value.  You're not going to be doing
'  mathematical operations on it anyway.  This is usually the case for large integers -- they typically exist
'  in JSON as an account ID.

'  You can get any JSON value as a string:
Dim accountId As String = json.StringOf("id")
Log("accountId: " & accountId)

'  Sample output:

'  id: -543893881
'  accountId: 20000000001234567