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reading int number and string number #1986

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reading int number and string number#1986
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kind: questionstate: needs more infothe author of the issue needs to provide more details

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@Behrouz-m
Behrouz-m
opened on Mar 14, 2020

Hi. I receive a JSON from 2 different places that contain a number. one of them returns JSON with a number and the other returns the same JSON with a number with quotes. like this:

{"state": 0}

or:

{"state": "0"}

the problem is how can I read them with no problem?

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  1. Behrouz-m
    added
    kind: question
    on Mar 14, 2020

  2. nlohmann commented on Mar 14, 2020

    @nlohmann
    nlohmann
    on Mar 14, 2020
    Owner

    What is your exact issue? Deserialization (also know as parsing) is described here: https://github.com/nlohmann/json#serialization--deserialization

  3. nlohmann
    added
    state: needs more infothe author of the issue needs to provide more details
    on Mar 14, 2020

  4. Behrouz-m commented on Mar 14, 2020

    @Behrouz-m
    Behrouz-m
    on Mar 14, 2020
    Author

    my problem is that state can be number and also string that contains number. I want to assign this number to int variable but it is not possible to read it using normal assignment.

    json jp = R"({"state": "10"})"_json;
int state = jp["state"]; // return 0 instead of value 10

json jp = R"({"state": 10})"_json;
int state = jp["state"]; // return 10 becuase it is number not string

  5. nlohmann commented on Mar 14, 2020

    @nlohmann
    nlohmann
    on Mar 14, 2020
    Owner

    You can call jp["state"].is_number() or jp["state"].is_string() to check the type.

  6. Behrouz-m commented on Mar 14, 2020

    @Behrouz-m
    Behrouz-m
    on Mar 14, 2020
    Author

    I know that. I am looking for an easier way instead of checking types for every number type in json. what about jp.get<int>("state") ?

  7. nlohmann commented on Mar 14, 2020

    @nlohmann
    nlohmann
    on Mar 14, 2020
    Owner

    The library does not provide such conversions.

  8. Behrouz-m
    closed this as completedon Mar 15, 2020
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