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(Xojo Plugin) Demonstrates how to Handle Large Integers in JSON

See more JSON Examples

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

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// Let's say your JSON has this:

// {
// 	"id": 20000000001234567
// }

Dim json As New Chilkat.JsonObject

Dim success As Boolean
success = json.LoadFile("qa_data/json/large_int.json")
If (success = False) Then
    System.DebugLog(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 Int32
id = json.IntOf("id")
System.DebugLog("id: " + Str(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
accountId = json.StringOf("id")
System.DebugLog("accountId: " + accountId)

// Sample output:

// id: -543893881
// accountId: 20000000001234567

 

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