Format JSON

t0msk

Hello, I get this JSON from one webservice:

"{
\"response_code\": 1,
\"sha256\": \"c8e61eacbbh31ae51e50a0083e5429bb6bea0f4d822c2793cd58cbf17e3638c1\", 
\"resource\": \"c8e61egcbbd31ae51e50a0093e5429bb6bea0fed822c2794cd58rbf17e3638c1\", 
\"scan_id\": \"c8e61earbd31ae51e50a0093e5429bb6bee0f4d822c2794cd58cbf1fe3638c1e1531522520\"
}"

But if I do:

QJsonDocument document = QJsonDocument::fromJson(reply);
QJsonObject rootObj = document.object();
qDebug() << rootObj.value(QString("scan_id"));

I will get:

QJsonValue(undefined)

So I think it is because that JSON is bad formated (it contains backslashes), is possible to format it into correct form?

kshegunov

Did you perchance get that output from qDebug()? If so use qDebug().noquote().

Mr Gisa

If the backslash is the only problem, why don't clear the json first using replace('\', '') - QByteArray & QByteArray::replace(const char * before, const char * after)

Taz742

@t0msk said in Format JSON:

QJsonDocument document = QJsonDocument::fromJson(reply);

Did you try QJsonDocument document = QJsonDocument::fromBinaryData(reply); ?

t0msk

@Mr-Gisa Replacing backslashes of whole reply, can be dangerous because it can corrupt data inside (if message contain backshlash).

@kshegunov Problem is that I cannot get value of node:

qDebug() << rootObj.value(QString("scan_id"));

It says:

QJsonValue(undefined)

@Taz742 Tried and didn't help.

Mr Gisa

You are right, but bare in mind that you won't find a method to remove the backslashes for you, you will have to sanitize the input yourself, perhaps you could instead of replacing the \ only, you could replace \" with ".

mrjj

@t0msk
You should try with
QJsonDocument::fromBinaryData(reply);
as @Taz742 suggests.
and the \ might NOT be real.
Try outputting with qDebug().noquote() << reply

t0msk

@mrjj Yea it removed backslahes, but why this doesn't work?

QJsonDocument document = QJsonDocument::fromBinaryData(reply);
QJsonObject rootObj = document.object();

qDebug().noquote() << rootObj.value(QString("scan_id"));

I still get:

QJsonValue(undefined)

mrjj

Hi
The returned QJsonValue is QJsonValue::Undefined if the key does not exist.
so it sounds like it dont have "scan_id" key
Try to dump what rootObj contains and see. what is in there.
also try
https://jsonlint.com/
to see if likes the json.
also reading the docs it seems
QJsonDocument::fromBinaryData expects data to be a blob and i think you have
just a string value so try with
QJsonDocument::fromJson instead. ( or again. sorry)

also check QJsonDocument if it parses correctly.
You have no error checking so it could be anything!
we are flying blind here :)
something like. (there will be dragons. not compiled)
QJsonParseError error;
QJsonDocument document = QJsonDocument::fromJson(reply, &error );
if (document.isNull() {
qDebug() << "Error: " << error.errorString() << error.offset;
}

Pablo J. Rogina

@t0msk said in Format JSON:

Hello, I get this JSON from one webservice:

What a network traffic capture shows about data actually received?

VRonin

Can you try printing the output of

qDebug() << document.isObject();
qDebug() << rootObj.toVariantMap();