How to connect via API?

[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.

[Mikeeeeee]

My OS - Windows.

[sierdzio]

@Mikeeeeee said in How to connect via API?:

My OS - Windows.

https://stackoverflow.com/questions/20351155/how-can-i-enable-ssl-in-qt-windows-application

[Mikeeeeee]

downloaded openssl-1.1.1b and put it in the folder with the executable file. Did not help.
In openssl-1.1.1b there is no libeay32.dll.

[Mikeeeeee]

There is a file e_os.h in the main folder of the library .

[SGaist]

What version of Qt are you using ?

[VRonin]

@Mikeeeeee said in How to connect via API?:

I installed everything in MaintenanceTool

Terrible idea

[Mikeeeeee]

I use Qt 5.12.2

[SGaist]

Then try again with the latest version of the 1.0 series.

[Mikeeeeee]

I downloaded openssl-1.0.2r. There is no bin folder. No .exe files. No libeay32.dll. What to do with it?

[Mikeeeeee]

I downloaded libeay32.dll ssleay32.dll and put them to the executable file and the project, but it still does not work.

[SGaist]

Still the same error or another one ?

[Mikeeeeee]

Same error: TLS initialization failed

[SGaist]

Did you check whether you can connect to another https resource and if it triggers the same error ?

[Mikeeeeee]

Not check. I don't know what other resource to connect to.

[jsulm]

This post is deleted!

[Mikeeeeee]

How to fix this error?

[Pablo J. Rogina]

@Mikeeeeee you may try a JSON testing site with secure connections, like https://jsonplaceholder.typicode.com

i.e. https://jsonplaceholder.typicode.com/todos/1 will return:

{
  "userId": 1,
  "id": 1,
  "title": "delectus aut autem",
  "completed": false
}

[Mikeeeeee]

@Pablo-J.-Rogina said in How to connect via API?:

https://jsonplaceholder.typicode.com/todos/1

Tried to send to this address and got an old error.

[Mikeeeeee]

And if you sent"http://json placeholder.typecode.com/todos/1" it works. Why https doesn't work?

[SGaist]

Just to be sure add this to your code:

qDebug() << QSslSocket::supportsSsl();
qDebug() << QSslSocket::sslLibraryBuildVersionString();
qDebug() << QSslSocket::sslLibraryVersionString();

[Mikeeeeee]

qDebug returns:
qt.network.ssl: QSslSocket::connectToHostEncrypted: TLS initialization failed
false
"OpenSSL 1.0.2p 14 Aug 2018"

[SGaist]

Are you sure you put the OpenSSL 1.0 dlls in the right folder ? Without mixing them with another version of OpenSSL.

[Mikeeeeee]

Sure. Here is the contents of the folder:

[mrjj]

hi
I wonder if it also wants libssl32.dll ?

[IRayman]

hey @Mikeeeeee,

You can try those .dll. I used it few weeks ago when I needed Qt SSL on Windows and it worked fine.

https://anonfile.com/m2Z7N6s6nd/dll_zip

[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
}