How to create special json format to post

ztencmcp

Hi Guys,

There is a server requires json format as below, how can i create it? Thanks.

this is what the server needs : {/"username/": /"admin/", /"password/": /"admin/", /"content/": /"hello world/"}

I create it with QJsonDocument and QJsonObject, it is like this:
"{/"username/":/"admin/", /"password/", /" admin/", /"content/": /"hello world/"}", it doesn't work.

QJsonObject json;
json.insert("username", "admin");
json.insert("password", "admin");
json.insert("content", "hello world");
QJsonDocument document;
document.setObject(json);
QByteArray byte_array = document.toJson(QJsonDocument::Compact);
QString json_str(byte_array);

Pls help, appreciate it.

jsulm

@ztencmcp Please show how you're doing it (show code).

ztencmcp

Hey Bro,

there's the code, appreciate it.

QJsonObject json;
json.insert("username", "admin");
json.insert("password", "admin");
json.insert("content", "hello world");
QJsonDocument document;
document.setObject(json);
QByteArray byte_array = document.toJson(QJsonDocument::Compact);
QString json_str(byte_array);

JonB

@ztencmcp said in How to create special json format to post:

QString json_str(byte_array);

isn't that what puts the double-quotes around the whole thing, which is what (I think) you say you so not want? If the server wants an object, which do you convert it to a (JSON) string? (Note that I am not a JSON expert!)

VRonin

Everything seems fine, why do you think it's wrong?

Pablo J. Rogina

@ztencmcp you may want to check/validate your JSON data with jsonlint

ztencmcp

@JonB Thanks, even if i use QByteArray type, the server responses json format error when i post data with QNetworkAccessManager. But if i use CPPRESTSDK, i can create the right json format with web::json::value postdata.serialize(), the right format is:

{/"username/": /"admin/", /"password/": /"admin/", /"content/": /"hello world/"}

without qoute before and after brace

Christian Ehrlicher

@ztencmcp said in How to create special json format to post:

{/"username/": /"admin/", /"password/": /"admin/", /"content/": /"hello world/"}

This is no valid json.

ztencmcp

@VRonin Thanks, if i use CPPRESTSDK, i can create the right json format with web::json::value postdata.serialize(), the right format is:

{/"username/": /"admin/", /"password/": /"admin/", /"content/": /"hello world/"}

without qoute before and after brace

jsulm

@ztencmcp said in How to create special json format to post:

without qoute before and after brace

Can you please explain how you're printing your JSON, so you see these quotes? Do you use qDebug()?
Because your "right format" you just posted still does contain the quotes...

ztencmcp

@Christian-Ehrlicher This is what i used CPPRESTSDK to build the right format with

web::json::value postdata.serialize()

{/"username/": /"admin/", /"password/": /"admin/", /"content/": /"hello world/"}

J.Hilk

@ztencmcp can you save the "correct" string to a file and show that one to us?

It's still very confusing, what the actual problem is!

JKSH

@ztencmcp said in How to create special json format to post:

the server responses json format error when i post data with QNetworkAccessManager.

How do you post? Please show the code from document.setObject(json); to QNetworkAccessManager::post()

JonB

@ztencmcp
I don't know, I'm not a JSON expert, but like @Christian-Ehrlicher I thought the JSON you show would not be valid. Look at this bit:

/"username/": /"admin/"

You have a / outside the quoted string for both the property name & value. Is that really correct??

ztencmcp

@jsulm(

you can see the pic, the right one i created it with cpprestsdk web::json::value serialize() fucntion, the wrong one i created it with qt5 QJsonObject。http server only accepts the right one。

KroMignon

@ztencmcp This does not really answer the question, please show the C++ code you have used to send the JSON string to your server.
Perhaps you can capture the TCP stream with WireShark to see what is really transmitted to the web server.

ztencmcp

@JKSH
here's the code. Thanks.

And i used cpprestsdk to do the same thing and it's right.

J.Hilk

@ztencmcp

When you look at the content of the QByteArray

You'll see, there is no " at the beginning or at the end. The Qt creates the same "JSON string" as cpprestsdk

the error is somewhere else.

JonB

@ztencmcp
Can we please be clear about one thing: in your first code it used /", in the stuff you are pasting now it uses \". Are you saying that in JSON one can use either / or \ as the "escape" character??

ztencmcp

@KroMignon Thanks for advice, pls see the pics below.