CkPython

Check if Integer Exists at JSON Path

Demonstrates how to get an integer value at a JSON path, and how to check to see if it exists. CkPython

import chilkat

success = False

json = chilkat.CkJsonObject()

# First build simple JSON..
json.UpdateInt("test.abc",100)

json.put_EmitCompact(False)
print(json.emit())

# This is our JSON:
# {
#   "test": {
#     "abc": 100,
#   }
# }

path = "test.notHere"

# The call to IntOf will return 0, because it's not present.
# But how do we know if it really was present, and the value was truly 0?
val = json.IntOf(path)
print("val = " + str(val))

# We cannot use LastMethodSuccess because LastMethodSuccess only applies
# to methods that:
# - return a string
# - return a new Chilkat object, binary bytes, or a date/time.
# - returns a boolean status where True = success and False = failed.
# - returns an integer where failure is defined by a return value less than zero.
# The IntOf method fits none of these requirements, and therefore the LastMethodSuccess 
# is not a valid indicator..
wasFound = json.get_LastMethodSuccess()
print("wasFound = " + str(wasFound) + " (not a valid indicator)")

# Instead, if the returned value is 0, we can double-check to see if the member was truly there..
if (val == 0):
    wasFound = json.HasMember(path)
    print("wasFound = " + str(wasFound))
    if (wasFound == True):
        print("The value was present and is 0.")
    else:
        print("no member is present at test.notHere")

else:
    print("val = " + str(val))

# Alternatively, you could check to see if the member exists beforehand..
if (json.HasMember(path) == True):
    print("val = " + str(json.IntOf(path)))
else:
    print("no member at " + path)