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(Go) Check if Integer Exists at JSON PathDemonstrates how to get an integer value at a JSON path, and how to check to see if it exists.
json := chilkat.NewJsonObject() var success bool // First build simple JSON.. json.UpdateInt("test.abc",100) json.SetEmitCompact(false) fmt.Println(*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) fmt.Println("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() fmt.Println("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 == 0 { wasFound = json.HasMember(path) fmt.Println("wasFound = ", wasFound) if wasFound == true { fmt.Println("The value was present and is 0.") } else { fmt.Println("no member is present at test.notHere") } } else { fmt.Println("val = ", val) } // Alternatively, you could check to see if the member exists beforehand.. if json.HasMember(path) == true { fmt.Println("val = ", *json.IntOf(path)) } else { fmt.Println("no member at ", path) } json.DisposeJsonObject() |
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