Google Go - Playing around with JSON

good.json

{
        "a" : "a is for apple",
        "b" : ["b", "is", "a", "list"],
        "c" : {
                "d" : "dog",
                "e" : "elephant",
                "f" : "frog"
        }
}

json.go

/*
Playing around with JSON

Bug - or something - the structs only seem to pick up
data if they are in CamelCase. Lower-case slot names
are completely ignored (the docs sugges that mathcing case
is preferred, this is not correct)
*/
package main

import (
 "os"
 "encoding/json"
 "fmt"
)

// Define the data structure allowed to arrive via JSON
type InputData struct {
        A string
        B []string
        C SubInputData
}

type SubInputData struct {
        D, E, F string
}

func main () {
        jsonFile  := os.Args[1]

        jsonFh, jsonFhErr := os.Open(jsonFile)
        if jsonFhErr != nil { panic(jsonFhErr) }

        fhStat, fhStatErr := jsonFh.Stat()
        if fhStatErr != nil { panic(fhStatErr) }

        json_bytes := make( []byte, fhStat.Size() )
        _, read_err := jsonFh.Read(json_bytes)
        if read_err != nil { panic(read_err) }
        jsonFh.Close()

        var myData InputData
        unmarshalErr := json.Unmarshal(json_bytes, &myData)
        if unmarshalErr != nil { panic(unmarshalErr) }
        fmt.Printf("%+v\n", myData)

}