Visual FoxPro

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.) Visual FoxPro

LOCAL lnSuccess
LOCAL loJson
LOCAL lnId
LOCAL lcAccountId

lnSuccess = 0

*  Let's say your JSON has this:

*  {
*  	"id": 20000000001234567
*  }

loJson = CreateObject('Chilkat.JsonObject')

lnSuccess = loJson.LoadFile("qa_data/json/large_int.json")
IF (lnSuccess = 0) THEN
    ? loJson.LastErrorText
    RELEASE loJson
    CANCEL
ENDIF

*  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
lnId = loJson.IntOf("id")
? "id: " + STR(lnId)

*  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:
lcAccountId = loJson.StringOf("id")
? "accountId: " + lcAccountId

*  Sample output:

*  id: -543893881
*  accountId: 20000000001234567

RELEASE loJson