oauthP5 / Openpaths: How to convert API response to JSONArray?

Marco

oauthP5 / Openpaths: How to convert API response to JSONArray?

in Contributed Library Questions • 2 months ago

Hi! I´m a student working on my thesis project, and using openpaths. I'm having a problem when trying to use my data that is returned from the API. On the "blprintOpenPathsExample.pde" example there is an attempt to convert the response.getBody() in to a JSONArray. Wich gives me an error "JSONArray is ambiguos". After looking at the javadocs, I found out that response.getBody() returns a String. So, as a work around, I'm saving dynamically that string as a local "data.json" file and then load it back as a JSONArray. But I would like to convert it directly without having to save a local file. I´m sure its possible... Am I doing something wrong? Can someone help me? Would be very appreciated!

Best regards!

Here is my code:

final String ACCESS = "";
final String SECRET = "";
final String URL = "https://openpaths.cc/api/1";
void openPaths()
{
OAuthService service = new ServiceBuilder()
.provider(OpenPathsApi.class)
.apiKey(ACCESS)
.apiSecret(SECRET)
.build();
OAuthRequest request = new OAuthRequest(Verb.GET, URL);
Token token = new Token("", "");
service.signRequest(token, request);
request.addQuerystringParameter("start_time", String.valueOf(System.currentTimeMillis() / 1000 - 30*24*60*60));
request.addQuerystringParameter("end_time", String.valueOf(System.currentTimeMillis() / 1000));
Response response = request.send();
//println(response.getBody());
String[] receivedJSONBody = { response.getBody() };
//println(receivedJSONBody);
saveStrings("openpaths.json", receivedJSONBody);
JSONArray loadedJSONObjects = loadJSONArray("openpaths.json");
for (int i=0; i<loadedJSONObjects.size(); i++)
{
JSONObject location = loadedJSONObjects.getJSONObject(i);
double longitude = location.getFloat("lon");
double latitude = location.getFloat ("lat");
double altitude = location.getFloat ("alt");
long timeStamp = location.getInt ("t");
println("Longitude: "+longitude);
println("Latitude: "+latitude);
println("Altitude: "+altitude);
println("Time Stamp: "+timeStamp);
println("");
}
}

Replies(6)

a__g

Re: oauthP5 / Openpaths: How to convert API response to JSONArray?

2 months ago

The error "JSONArray is ambiguos" means that there are more than one class called "JSONArray". Make sure to remove any import statements for JSON libraries in your sketch as they may cause the compiled to get confused.

F.y.i. there's no need for external JSON libraries anymore, it's included in the core now. =)

Marco

Re: oauthP5 / Openpaths: How to convert API response to JSONArray?

2 months ago

Hi, thank you!

The only two libraries that i am importing are: import oauthP5.oauth.*; and import oauthP5.apis.*; they are both for oauthP5 and Openpaths API.

On the library's webpage there is an example: http://nytlabs.com/oauthp5/examples/blprntOpenPathsExample/blprntOpenPathsExample.pde, where this also happens. I guess this happens because this was done before Processing 2.0.1.

How can I fix this?

PhiLho

Re: oauthP5 / Openpaths: How to convert API response to JSONArray?

2 months ago

Two ways:

- if you use the built-in Json library, be more selective in your imports (importing specifically the classes you need instead of *);

- if you want to use the Json library coming with your library, you have to specify its fully-qualified name, ie. to put the package before each usage of the class name, something like: oauthP5.apis.JSONArray (supposing this one is in this package, I hadn't looked).

Marco

Re: oauthP5 / Openpaths: How to convert API response to JSONArray?

2 months ago

Hi!,

Thank you both for your time and consideration! I´m still stuck here... Sorry If I didn't explain my self or if there is something very easy that I am not seeing/getting...

I will prefer to use the built-in (Processing) Json library.

From my initial code (webpage top side) The response.getBody() returns a String in JSON format Array, but it is still just a String (I thinks so...), So when I try:

JSONArray loadedJSONObjects = loadJSONArray(response.getBody());

I get a java.lang.NullPointerException, so after this what I did was:

String[] receivedJSONBody = { response.getBody() };

saveStrings("openpaths.json", receivedJSONBody);

JSONArray loadedJSONObjects = loadJSONArray("openpaths.json");

I saved that string as openpaths.json and then reloaded it. Shouldn't this be the same thing? Shouldn´t I be able to load response.getBody() without having to save a local file?