PowerShell

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. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$json = New-Object Chilkat.JsonObject

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

$json.EmitCompact = $false
$($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)
$("val = " + $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.LastMethodSuccess
$("wasFound = " + $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 -eq 0) {
    $wasFound = $json.HasMember($path)
    $("wasFound = " + $wasFound)
    if ($wasFound -eq $true) {
        $("The value was present and is 0.")
    }
    else {
        $("no member is present at test.notHere")
    }

}
else {
    $("val = " + $val)
}

# Alternatively, you could check to see if the member exists beforehand..
if ($json.HasMember($path) -eq $true) {
    $("val = " + $json.IntOf($path))
}
else {
    $("no member at " + $path)
}