Sending international characters over network

[sajmplus]

Hello,

i'm trying to send POST request with international characters to my WebAPI.

I'm creating JSON from QString's and try to sent them by QNetworkAccessManager:ost method. Unfortunately my WebAPI (it's Java based) rejects QByteArray Utf8 encoding. Our API developer said that my application send JSON UTF8-CodeUnits-Escaped (i.e. "\xc4\x85\xc4\x99" as "Ä…Ä™") however WebAPI accepts only decoded strings (original like "Ä…Ä™") or Unicode code units ("\u0105\u0119").

How can I send post request in Unicode code units? And second question: how can I look into raw QNetworkAccessManager request? (text format like in CURL)

[anda_skoa]

How did you convert the QString into QByteArray? QString::toUtf8()?

Maybe use QTextCodec with a different encoding? E.g UTF-16?

Cheers,
_

[sajmplus]

How did you convert the QString into QByteArray? QString::toUtf8()?

Maybe use QTextCodec with a different encoding? E.g UTF-16?

Cheers,
_

Thank you for reply.

I'm get QString from QLineEdit, insert it into QJsonObject as one of JSON value, then generate QByteArray with QJsonDocument::toJson().

#include <QCoreApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    QString s = "Ä…Ä™";
 
    //Set headers and URL
    QNetworkRequest request;
    request.setUrl(QUrl("https://web.api.url"));
    request.setRawHeader("Accept", "*/*");
    request.setRawHeader("Authorization", "Basic **********");
    request.setRawHeader("Content-Type", "application/json; charset=utf-8");
    request.setRawHeader("Accept-Language", "pl-PL,en;q=0.8");
    request.setSslConfiguration(QSslConfiguration::defaultConfiguration());
 
    //Create JsonObject
    QJsonObject postJson;
    postJson["name"] = s;
 
    QJsonDocument doc(postJson);
 
    //Insert Json to QByteArray
    QByteArray postData = doc.toJson(QJsonDocument::Compact);
 
    //Print data step-by-step
    qDebug() << "QString:" << s;
    qDebug() << "QJsonObject: " << postJson;
    qDebug() << "QJsonDocument: " << doc;
    qDebug() << "QByteArray: " << postData;
 
    QNetworkAccessManager nam;
 
    //Connect finished signal
    QObject::connect(&nam, &QNetworkAccessManager::finished,
                     [](QNetworkReply *reply) {
                        qDebug() << "Reply: " << reply->readAll();
                        qDebug() << "Status code: "
                                 << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute)
                                    .toInt();
                        if(!reply->error()) {
                            qDebug() << "Error: " << reply->errorString();
                        }
                     });
 
    //Start POST request
    auto reply = nam.post(request, postData);
 
    //Ignore SSL errors
    QObject::connect(reply, &QNetworkReply::sslErrors,
            [&](const QList<QSslError> &errors) {
                reply->ignoreSslErrors(errors);
            });
 
    return a.exec();
}

#include <QCoreApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QString s = "Ä…Ä™";

    //Set headers and URL
    QNetworkRequest request;
    request.setUrl(QUrl("https://web.api.url"));
    request.setRawHeader("Accept", "*/*");
    request.setRawHeader("Authorization", "Basic **********");
    request.setRawHeader("Content-Type", "application/json; charset=utf-8");
    request.setRawHeader("Accept-Language", "pl-PL,en;q=0.8");
    request.setSslConfiguration(QSslConfiguration::defaultConfiguration());

    //Create JsonObject
    QJsonObject postJson;
    postJson["name"] = s;

    QJsonDocument doc(postJson);

    //Insert Json to QByteArray
    QByteArray postData = doc.toJson(QJsonDocument::Compact);

    //Print data step-by-step
    qDebug() << "QString:" << s;
    qDebug() << "QJsonObject: " << postJson;
    qDebug() << "QJsonDocument: " << doc;
    qDebug() << "QByteArray: " << postData;

    QNetworkAccessManager nam;

    //Connect finished signal
    QObject::connect(&nam, &QNetworkAccessManager::finished,
                     [](QNetworkReply *reply) {
                        qDebug() << "Reply: " << reply->readAll();
                        qDebug() << "Status code: "
                                 << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute)
                                    .toInt();
                        if(!reply->error()) {
                            qDebug() << "Error: " << reply->errorString();
                        }
                     });

    //Start POST request
    auto reply = nam.post(request, postData);

    //Ignore SSL errors
    QObject::connect(reply, &QNetworkReply::sslErrors,
            [&](const QList<QSslError> &errors) {
                reply->ignoreSslErrors(errors);
            });

    return a.exec();
}

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How should I use QTextCodec in my case?

[anda_skoa]

if "s" is the problematic content than at instead of assigning "s" to the JSON object you assign the converted character array.

Cheers,
_

[sajmplus]

if "s" is the problematic content than at instead of assigning "s" to the JSON object you assign the converted character array.

Cheers,
_

Ok, but how can I convert this QString to unicode escaped form? Unfortunately I cannot append "\u" character to QString.

Here is console output of my application:

QString: "Ä…Ä™"
QJsonObject: QJsonObject({"name":"Ä…Ä™"})
QJsonDocument: QJsonDocument({"name":"Ä…Ä™"})
QByteArray: "{\"name\":\"\xC4\x85\xC4\x99\"}"
Reply: "{\n \"name\" : \"\xC4\x85\xC4\x99\" \n}"
Status code: 201
Error: "Unknown error"

[anda_skoa]

How does the assignment look now?
Which text codec did you use?

Cheers,
_

[sajmplus]

How does the assignment look now?
Which text codec did you use?

Cheers,
_

This output in post #5 is recived from code in post #3.

[anda_skoa]

Ah, ok.
Report back once you've had a chance to try a different encoding for the value of "name".

Cheers,
_