[Qt 프로그래밍] API통신, rest-api 를 이용한 json 데이터 통신

 

    //1. 네트워크 통신을 위한 QNetworkAccessManager,QNetworkRequest 세팅
    
    QNetworkAccessManager *mgr = new QNetworkAccessManager();
    const QUrl url("http://api~");//url
    QNetworkRequest request(url);
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
	
    
    //2. api request 양식에 따른 json 세팅
    QJsonObject obj;
    
    /*
    obj["key1"] = "value1";
    obj["key2"] = "value2";
    obj["key3"] = "value3";
    */

    obj["SITE_CD"] = "1093";
    obj["STR_CD"] = "0001";
    obj["SET_TARGET_IP"] = "192.168.1.161";

    QJsonDocument doc(obj);
    QByteArray data = doc.toJson();
    
    
    
    //3. api 요청
    QNetworkReply *reply = mgr->post(request, data);

	
    //4. reply의 finished signal이 발생할때 응답값 처리.
    QObject::connect(reply, &QNetworkReply::finished, [=](){ //람다식
        if(reply->error() == QNetworkReply::NoError){
            QByteArray ba=reply->readAll();
            QString contents = QString::fromUtf8(ba); 
            qDebug()<<contents;
        }
        else{
            QString err = reply->errorString();
            qDebug() << err;
        }
        reply->deleteLater();
    });