I may not understand

[TParis]

Hello, I'm new to C++.

I'm using Baylor's GNU licensed socket example to pull from omdbapi.com a JSON object with information about movies. This is for a non-academic class and it's a side project just to keep me busy while the class goes over the basics.

I have a std::string JSON and it has the value of:

{"Title":"Star Trek Beyond","Year":"2016","Rated":"PG-13","Released":"22 Jul 2016","Runtime":"122 min","Genre":"Action, Adventure, Sci-Fi","Director":"Justin Lin","Writer":"Simon Pegg, Doug Jung, Gene Roddenberry (based upon "Star Trek" created by)","Actors":"Chris Pine, Zachary Quinto, Karl Urban, Zoe Saldana","Plot":"The USS Enterprise crew explores the furthest reaches of uncharted space, where they encounter a new ruthless enemy who puts them and everything the Federation stands for to the test.","Language":"English","Country":"USA, Hong Kong, China","Awards":"Nominated for 1 Oscar. Another 1 win & 17 nominations.","Poster":"https://images-na.ssl-images-amazon.com/images/M/MV5BODgzN2E1YjctODg5Yi00YzYwLWJjZjAtNDg2MGE2Y2MyYjBmXkEyXkFqcGdeQXVyNjM1MTQ0NTQ@._V1_SX300.jpg","Metascore":"68","imdbRating":"7.1","imdbVotes":"154,036","imdbID":"tt2660888","Type":"movie","Response":"True"}

This is my code:

    string amazonData = getAmazonData("Star Trek Beyond");
string JSON = isolateJSON(&amazonData);
try {
	movieObject = json::parse(JSON);
}
catch (exception& e) {
	printf("%s\n", e.what());
}

VS has highlighted the json::parse and said "parse no instance of overloaded function". It appears to accept std::string so I'm not sure what the issue is.

Any help is appreciated.

[gregmarr]

Does it build even though intellisense is giving you an error? The intellisense compiler is different than the main compiler, so it may just be a problem with the intellisense compiler.

[TParis]

It compiles but it errors. This is the error stack:

Unhandled Exception: System.Runtime.InteropServices.SEHException: External component has thrown an exception.
at _CxxThrowException(Void* , _s__ThrowInfo* )
at nlohmann.detail.from_json<class nlohmann::basic_json<class std::map,class std::vector,class std::basic_string<char,struct std::char_traits,class std::allocator >,bool,__int64,unsigned __int64,double,class std::allocator,struct nlohmann::adl_serializer>,int,0>(basic_json<std::map,std::vector,std::basic_string<char,std::char_traits,std::allocator >,bool,__int64,unsigned __int64,double,std::allocator,nlohmann::adl_serializer>* j, Int32* val) in c:\users\dotlaptop\documents\visual studio 2015\projects\consoleapplication7\consoleapplication7\json.hpp:line 817
at nlohmann.detail.from_json_fn.call<class nlohmann::basic_json<class std::map,class std::vector,class std::basic_string<char,struct std::char_traits,class std::allocator >,bool,__int64,unsigned __int64,double,class std::allocator,struct nlohmann::adl_serializer>,int>(from_json_fn* , basic_json<std::map,std::vector,std::basic_string<char,std::char_traits,std::allocator >,bool,__int64,unsigned __int64,double,std::allocator,nlohmann::adl_serializer>* j, Int32* val, priority_tag<1> __unnamed002) in c:\users\dotlaptop\documents\visual studio 2015\projects\consoleapplication7\consoleapplication7\json.hpp:line 856
at nlohmann.detail.from_json_fn.operator()<class nlohmann::basic_json<class std::map,class std::vector,class std::basic_string<char,struct std::char_traits,class std::allocator >,bool,__int64,unsigned __int64,double,class std::allocator,struct nlohmann::adl_serializer>,int>(from_json_fn* , basic_json<std::map,std::vector,std::basic_string<char,std::char_traits,std::allocator >,bool,__int64,unsigned __int64,double,std::allocator,nlohmann::adl_serializer>* j, Int32* val) in c:\users\dotlaptop\documents\visual studio 2015\projects\consoleapplication7\consoleapplication7\json.hpp:line 871

[gregmarr]

Do you have an example of the JSON that's failing? Never mind, I see it.

[gregmarr]

This might be your problem:

"Writer":"Simon Pegg, Doug Jung, Gene Roddenberry (based upon "Star Trek" created by)",

Those quotes around Star Trek should be escaped.

[TParis]

The json I posted appears not to be the raw data, hang on and I'll grab the raw values.

[TParis]

This is the actual data in the JSON string. The value before I was grabbing from VS' visualizer but apparently it doesn't handle it correctly.

{"Title":"Star Trek Beyond","Year":"2016","Rated":"PG-13","Released":"22 Jul 2016","Runtime":"122 min","Genre":"Action, Adventure, Sci-Fi","Director":"Justin Lin","Writer":"Simon Pegg, Doug Jung, Gene Roddenberry (based upon "Star Trek" created by)","Actors":"Chris Pine, Zachary Quinto, Karl Urban, Zoe Saldana","Plot":"The USS Enterprise crew explores the furthest reaches of uncharted space, where they encounter a new ruthless enemy who puts them and everything the Federation stands for to the test.","Language":"English","Country":"USA, Hong Kong, China","Awards":"Nominated for 1 Oscar. Another 1 win & 17 nominations.","Poster":"https://images-na.ssl-images-amazon.com/images/M/MV5BODgzN2E1YjctODg5Yi00YzYwLWJjZjAtNDg2MGE2Y2MyYjBmXkEyXkFqcGdeQXVyNjM1MTQ0NTQ@._V1_SX300.jpg","Metascore":"68","imdbRating":"7.1","imdbVotes":"154,036","imdbID":"tt2660888","Type":"movie","Response":"True"}

[gregmarr]

This still has the same issue. It's invalid JSON.

[TParis]

Hmm, when I pasted it, it had the escape vals.
{"Title":"Star Trek Beyond","Year":"2016","Rated":"PG-13","Released":"22 Jul 2016","Runtime":"122 min","Genre":"Action, Adventure, Sci-Fi","Director":"Justin Lin","Writer":"Simon Pegg, Doug Jung, Gene Roddenberry (based upon \"Star Trek\" created by)","Actors":"Chris Pine, Zachary Quinto, Karl Urban, Zoe Saldana","Plot":"The USS Enterprise crew explores the furthest reaches of uncharted space, where they encounter a new ruthless enemy who puts them and everything the Federation stands for to the test.","Language":"English","Country":"USA, Hong Kong, China","Awards":"Nominated for 1 Oscar. Another 1 win & 17 nominations.","Poster":"https://images-na.ssl-images-amazon.com/images/M/MV5BODgzN2E1YjctODg5Yi00YzYwLWJjZjAtNDg2MGE2Y2MyYjBmXkEyXkFqcGdeQXVyNjM1MTQ0NTQ@._V1_SX300.jpg","Metascore":"68","imdbRating":"7.1","imdbVotes":"154,036","imdbID":"tt2660888","Type":"movie","Response":"True"}

Is that better?

Edit: It appears github was also messing with my escape characters.

[gregmarr]

Yes, much.

[nlohmann]

You can add three backticks around your example, like this.

```js
{"foo": "bar"}
```

This is then rendered as

{"foo": "bar"}

[gregmarr]

Do you know the release number or the commit hash of the version you're using, because it's not the head of master, the line numbers don't line up.

[TParis]

I can't be positive, but I think it's c7afb34

[gregmarr]

Unhandled Exception: System.Runtime.InteropServices.SEHException: External component has thrown an exception.
at _CxxThrowException(Void* , _s__ThrowInfo* )
at from_json<basic_json<>,int,0>(basic_json<>* j, Int32* val) in json.hpp:line 817
at from_json_fn.call<basic_json<>,int>(from_json_fn* , basic_json<>* j, Int32* val, priority_tag<1> __unnamed002) in json.hpp:line 856
at from_json_fn.operator()<basic_json<>,int>(from_json_fn* , basic_json<>* j, Int32* val) in json.hpp:line 871

Reformatted, stripped namespaces, template params and paths, to make it easier to read.

[gregmarr]

Line 817 is:

            JSON_THROW(std::domain_error("type must be number, but is " + j.type_name()));