c++ Rest APi 3rd party integration Question

RahibeMeryem

Hi,

I try to use webcc rest server with Qt framework.

Its working so far so good.

I want to get form data via signal slot but sitll can not.

resapi.h

#ifndef RESTAPI_H
#define RESTAPI_H

//#include "rest_server.h"
#include <fstream>
#include <iostream>
#include <string>

#include "webcc/logger.h"
#include "webcc/response_builder.h"
#include "webcc/server.h"
#include "opencv2/core.hpp"
#include <opencv2/imgcodecs.hpp>
#include <QPixmap>

#include <QObject>

class RestApi : public QObject , public webcc::View
{
    Q_OBJECT

public:
    explicit RestApi (QObject *parent = nullptr) ;
    int image_counter = 0;

public slots:

    void start_Rest();
    webcc::ResponsePtr Handle(webcc::RequestPtr request) ;

    webcc::ResponsePtr Post(webcc::RequestPtr request);
    void sendPix(QPixmap &pix);

signals:
    void rest_image_received(const QPixmap &qpix);
    void test_signal();

};

#endif // RESTAPI_H

restapi.cc

#include "restapi.h"
#include <QDebug>
RestApi::RestApi(QObject *parent) : QObject(parent)
{
    qDebug() << "xx restapi.cc  REST API started " << endl;

}


void RestApi::start_Rest()
{

    int PORT = 7000;
    WEBCC_LOG_INIT("", webcc::LOG_CONSOLE);

    std::uint16_t port = static_cast<std::uint16_t>(PORT);

    try {
        webcc::Server server{ boost::asio::ip::tcp::v4(), port };

        server.set_buffer_size(webcc::kBufferSize * 10);

        server.Route("/upload", std::make_shared<RestApi>(), { "POST" });

        server.Run();

    } catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
//        return 1;
    }
}

webcc::ResponsePtr RestApi::Handle(webcc::RequestPtr request)
{

    if (request->method() == "POST") {
        return Post(request);
    }

    return {};
}

webcc::ResponsePtr RestApi::Post(webcc::RequestPtr request)
{
    emit test_signal ();
    std::cout << "form parts: " << request->form_parts().size() << std::endl;
    std::string resp ;
    for (auto& part : request->form_parts()) {
        std::cout << "name: " << part->name() << std::endl;
        resp = part->name();
        if (part->file_name().empty()) {
            std::cout << "data: " << part->data() << std::endl;
        } else {
            size_t size=part->data().size();

            if(true){
                std::ofstream myFile ("/Users/tulpar/Projects/webcc-21Dec/build/webccData-QT"+ std::to_string (image_counter++) +".jpeg", std::ios::out | std::ios::binary);
                myFile << part->data();

                myFile.close ();
                QByteArray byteArray(part->data().c_str(), part->data().length());

                QPixmap img;
                img.loadFromData (byteArray);
                RestApi::sendPix (img);
            }

            // Save part->data() as binary to file.
            // ...
        }
    }

    return webcc::ResponseBuilder{}.Created().Body(" ..  OK " + resp)();
}

void RestApi::sendPix(QPixmap &pix)
{
    emit rest_image_received (pix);
}

mainwindow.cc
......

bool connected = connect (restApi ,  &RestApi::rest_image_received , this , &MainWindow::showRestImage);

    bool connected_ = connect (restApi ,  &RestApi::test_signal , this , &MainWindow::test_sig);

its not receiving the pix

Best

Christian Ehrlicher

@RahibeMeryem said in c++ Rest APi 3rd party integration Question:

server.Route("/upload", std::make_shared<RestApi>(), { "POST" });

This creates a new instance where the signal is not connected.

RahibeMeryem

@Christian-Ehrlicher bool connected and connected_ is true .

what am I missing ?

or how can I connect ?

Christian Ehrlicher

@RahibeMeryem said in c++ Rest APi 3rd party integration Question:

what am I missing ?

You did not read my post. You're creating a new instance where you don't connect anything to it.

RahibeMeryem

@RahibeMeryem said in c++ Rest APi 3rd party integration Question:

    server.Route("/upload", std::make_shared<RestApi>(), { "POST" });

@Christian-Ehrlicher is there anyway to connect :

    server.Route("/upload", std::make_shared<RestApi>(), { "POST" });

Christian Ehrlicher

@RahibeMeryem said in c++ Rest APi 3rd party integration Question:

is there anyway to connect :

Yes, why not. You can create the needed pointer earlier.

RahibeMeryem

@Christian-Ehrlicher

Thank you for your help.

I am a user of c++ mostly. not deep knowledge.

Would you mind to show me where can I put ?

Best

Christian Ehrlicher

@RahibeMeryem said in c++ Rest APi 3rd party integration Question:

Would you mind to show me where can I put ?

It's basic stuff. Don't think it will help you in any way when you simply copy it from somewhere else.
I would suggest to pass the shared pointer to the start_Rest() function and therefore you can do the connection from where you call this function.

RahibeMeryem

Hi @Christian-Ehrlicher

https://github.com/sprinfall/webcc/tree/master/examples/qt_app_server

is came up a good example which I use it . Thanks to Chunting Gu aka: sprinfall

Thank you.

Best