How to connect via API?

Mikeeeeee

Hi!
How to connect via API?
I want to connect to alphavantage.co
I do this:

QNetworkAccessManager apiQuery;
    QNetworkRequest request;
    request.setUrl(QUrl("https://  &???"));

    apiQuery.get(request);

What and how to finish?

sierdzio

Add QT += network to your .pro file, run qmake and rebuild your project.

Mikeeeeee

Thanks, corrected. What's next?

sierdzio

@Mikeeeeee said in How to connect via API?:

Thanks, corrected. What's next?

That's up to you to figure out.

Mikeeeeee

@sierdzio said in How to connect via API?:

That's up to you to figure out.

I would like to get something like this: https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=MSFT&interval=5min&apikey=demo

There is only this:

    QNetworkRequest request;
    request.setUrl(QUrl("https://  &???"));

    apiQuery.get(request);

sierdzio

Well you can just put that URL into setUrl() call, should work.

Alternatively, you can build the QUrl manually, and add relevant parameters using QUrlQuery.

Mikeeeeee

@sierdzio said in How to connect via API?:

Well you can just put that URL into setUrl() call, should work.
Alternatively, you can build the QUrl manually, and add relevant parameters using QUrlQuery.

I did this:

    QNetworkRequest request;
    request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=MSFT&interval=5min&apikey=demo"));

    apiQuery.get(request);

How to get and read json now?

sierdzio

@Mikeeeeee said in How to connect via API?:

@sierdzio said in How to connect via API?:

Well you can just put that URL into setUrl() call, should work.
Alternatively, you can build the QUrl manually, and add relevant parameters using QUrlQuery.

I did this:
    QNetworkRequest request;
    request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=MSFT&interval=5min&apikey=demo"));

    apiQuery.get(request);
How to get and read json now?

See the docs.

Mikeeeeee

@Mikeeeeee said in How to connect via API?:

I did this:

I made this code and got an error: invalid application of 'sizeof' to incomplete type 'QNetworkReply'
Q_STATIC_ASSERT_X(sizeof(T), "Type argument of Q_DECLARE_METATYPE(T*) must be fully defined");

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_INTRADAY&symbol=MSFT&interval=5min&apikey=demo"));

    apiQuery->get(request);
}

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

sierdzio

This should help:

#include <QNetworkReply>

Mikeeeeee

Thanks, earned. I receive a response signal. But theoretically, a json file should come in response to the request. Please tell me how you can open the response data, read it, and then delete it if it is not deleted by itself.

Pablo J. Rogina

@Mikeeeeee Internet searching is your friend... maybe this example could help you.

Mikeeeeee

This example is not working.

VRonin

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

then:

void MainWindow::on_testButton_clicked()
{
    QNetworkRequest request;
    request.setUrl(QUrl("https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=MSFT&interval=5min&apikey=demo"));
QNetworkReply* reply = apiQuery->get(request)
    connect(reply ,&QNetworkReply::finished,this,std::bind(&MainWindow::on_reply,this,reply ));
}
void MainWindow::on_reply(QNetworkReply* reply){
QJsonDocument jdoc = QJsonDocument::fromJson(reply->readAll());
// do something with the jdoc
}

Mikeeeeee

Qt says: qt.network.ssl: QSslSocket::connectToHostEncrypted: TLS initialization failed
I have api-key: 63YUZ8NP5SW1D302
How can I use the key?

VRonin

Qt says: qt.network.ssl: QSslSocket::connectToHostEncrypted: TLS initialization failed

Make sure you have OpenSSL installed

I have api-key: 63YUZ8NP5SW1D302
How can I use the key?

RTFM: https://www.alphavantage.co/documentation/

Mikeeeeee

@VRonin said in How to connect via API?:

OpenSSL

This link is nothing about OpenSSL.
OpenSSL need to connect to the project?

VRonin

Qt uses OpenSSL to implement TLS and SSL

Mikeeeeee

I installed everything in MaintenanceTool. Do I need to download additional OpenSSL?
If you need to install OpenSSL, then how to connect it to Qt?

SGaist

Hi,

@Mikeeeeee said in How to connect via API?:

I installed everything in MaintenanceTool. Do I need to download additional OpenSSL?
If you need to install OpenSSL, then how to connect it to Qt?

What OS are you on ? My guess would be Windows.