How to connect via API?

Mikeeeeee

Thanks. https is working.
Trying to use the function TIME_SERIES_DAILY_ADJUSTED.
https://www.alphavantage.co/documentation/
If you do so it works:

request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&outputsize=compact&apikey=XXXXXXXXXXXXX"));

If doing so does not work:

request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&outputsize=full&apikey=XXXXXXXXXXXXXXX"));

It's me doing something wrong or the server is not working?

[edit: removed API key SGaist]

SGaist

Since you don't show how you are processing the QNetworkReply object created for your request one can only guess. What signals did you connect from the reply object ? What exactly do you mean by "does not work" ?

By the way, I've edited out your api key, it's not a good idea to post such information.

Mikeeeeee

It's my h-file:

private slots:
    void on_testButton_clicked();
    void testSlotFromQDebug();
    void onReply(QNetworkReply* reply);

private:
    Ui::MainWindow *ui;
    QNetworkAccessManager *apiQuery = new QNetworkAccessManager;

it's cpp-file:```
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

//connect(apiQuery, &QNetworkAccessManager::finished, this, &MainWindow::testSlotFromQDebug);

}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_testButton_clicked()
{
QNetworkRequest request;
//request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&apikey=demo"));
request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&outputsize=full&apikey=111111"));
//request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&outputsize=compact&apikey=1111"));

QNetworkReply* reply = apiQuery->get(request);
connect(reply ,&QNetworkReply::finished,this,std::bind(&MainWindow::onReply,this,reply ));

}

void MainWindow::testSlotFromQDebug()
{
//qDebug()<<"point1";
}

void MainWindow::onReply(QNetworkReply* reply){
QJsonDocument jdoc = QJsonDocument::fromJson(reply->readAll());
//qDebug() << QSslSocket::supportsSsl();
//qDebug() << QSslSocket::sslLibraryBuildVersionString();
//qDebug() << QSslSocket::sslLibraryVersionString();
qDebug()<<jdoc;
// do something with the jdoc
}

SGaist

Again: what do you mean by "it's not working" when using the full output size ?

Mikeeeeee

Nothing comes back. I do not receive json document.

SGaist

What about connecting the errors related signals ? That might give you some clues about what is happening.

Mikeeeeee

But what signals and slots to use to find the error?

Mikeeeeee

This post is deleted!

SGaist

Maybe QNetworkReply::error ?

Mikeeeeee

I get "QNetworkReply::NoError"

SGaist

Did you also check QNetworkReply::sslErrors ?

Mikeeeeee

But it's a signal. And what should be placed instead of const QList<QSslError> &errors?

jsulm

@Mikeeeeee said in How to connect via API?:

But it's a signal

Yes, and you can connect a slot to a signal...
"And what should be placed instead of const QList<QSslError> &errors?" - ?
Nothing, you implement a slot with same parameter and connect it to the signal as usual:

void MyClass::handleSslErrors(const QList<QSslError> &errors)
{
...
}

Mikeeeeee

Did so, the slot does not work. So no mistakes.

connect(reply, & QNetworkReply::sslErrors , this,  &MainWindow::testSlotFromQDebug);

Mikeeeeee

The server seems to works too, because when you click on the link https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&outputsize=full&apikey=demo open the file. Maybe this is due to the fact that the file is large?

SGaist

I tested your query on macOS and it worked fine. What exact version of Windows are you using ?

Mikeeeeee

Yes, I use Windows

jsulm

@Mikeeeeee Do you think "Yes, I use Windows" is a useful answer to "What exact version of Windows are you using?"?!
We already know that you're using Windows, the question was which exact version?...
Why can't you give exact answers and ask questions which can actually be understood?

Mikeeeeee

Sorry, I use Windows 7 pro 64bit.

Mikeeeeee

The problem turned out to be a large file size. You should read line by line.

Заголовочный файл
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include "QDebug"
#include "QtNetwork/QNetworkAccessManager"
#include "QtNetwork/QNetworkRequest"
#include "QtNetwork/QNetworkReply"
#include <QUrl>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonValue>
#include <QTextCodec>  // для преобразования кодировки
//#include "e_os.h"
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
 
private slots:
    void on_testButton_clicked();
    void onReply(QNetworkReply* reply);
 
private:
    Ui::MainWindow *ui;
    QNetworkAccessManager m_apiQuery;
};
 
#endif // MAINWINDOW_H
 
Файл реализации
#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(&m_apiQuery, &QNetworkAccessManager::finished, this, &MainWindow::onReply);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_testButton_clicked()
{
    QNetworkRequest request;
    request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=MSFT&outputsize=compact&apikey=63YUZ8NP5SW1D302"));
    m_apiQuery.get(request);
}
 
 
void MainWindow::onReply(QNetworkReply* reply){
    QByteArray replyArray;
    while (!reply->atEnd()) {
        replyArray.append(reply->readLine());
    }
    QJsonDocument doc = QJsonDocument::fromJson(replyArray);
    qDebug() << doc;
    reply->deleteLater();
}