Qt中简单使用Firebase

上一篇对Firebase进行了简要的介绍。

今天对Firebase进行简单的应用。在qt中，因为我不会Android和ios开发。

代码出自github:
https://github.com/clkasd/qt-firebaseapi

最主要的就是写一个类，Firebase.

直接代码：
firebase.h

#ifndef FIREBASE_H#define FIREBASE_H#include <QObject>#include <QtNetwork/QNetworkAccessManager>#include <QtNetwork/QNetworkReply>#include <QtNetwork/QNetworkRequest>#include <QUrl>#include <QUrlQuery>#include <QDebug>#include <QtGlobal>#include <datasnapshot.h>class Firebase : public QObject{    Q_OBJECTpublic:    explicit Firebase(QObject *parent = 0);    Firebase(QString hostName,QString child);    Firebase(QString hostName);    void init();    void setValue(QString str);    void getValue();    void deleteValue();    void setToken(QString);    void listenEvents();    Firebase* child(QString childName);signals:    void eventResponseReady(QString);    void eventDataChanged(DataSnapshot*);public slots:    void replyFinished(QNetworkReply*);    void onReadyRead(QNetworkReply*);    void eventFinished();    void eventReadyRead();private:    QString host;    QString firebaseToken="";    QNetworkAccessManager *manager;    QString currentNode;    QString latestNode;    QString buildPath(int);    QString createJson(QString);    void open(const QUrl &url);    QByteArray trimValue(const QByteArray &line) const;};#endif // FIREBASE_H

firebase.cc

#include "firebase.h"#include <string.h>#include <QIODevice>#include <QBuffer>#include <QJsonDocument>#include <datasnapshot.h>Firebase::Firebase(QObject *parent) :    QObject(parent){}void Firebase::init(){    manager=new QNetworkAccessManager(this);    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));}Firebase::Firebase(QString hostName){    host=hostName;    currentNode="";    init();}void Firebase::setToken(QString token){    firebaseToken=token;}Firebase::Firebase(QString hostName,QString child){    host=hostName            .append(child).append("/");    latestNode=child;    init();}Firebase* Firebase::child(QString childName){    Firebase *childNode=new Firebase(host,childName);    childNode->setToken(firebaseToken);    return childNode;}void Firebase::open(const QUrl &url){    QNetworkRequest request(url);    request.setRawHeader("Accept",                         "text/event-stream");    QNetworkReply *_reply = manager->get(request);    connect(_reply, &QNetworkReply::readyRead, this, &Firebase::eventReadyRead);    connect(_reply, &QNetworkReply::finished, this, &Firebase::eventFinished);}void Firebase::eventFinished(){    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());    if (reply)    {        QUrl redirectUrl = reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl();        if (!redirectUrl.isEmpty())        {            reply->deleteLater();            open(redirectUrl);            return;        }        reply->deleteLater();    }}void Firebase::eventReadyRead(){    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());    if(reply)    {        QByteArray line=reply->readLine();        if(!line.isEmpty())        {            QByteArray eventName=trimValue(line);            line=reply->readAll();            if(eventName=="put")            {                DataSnapshot *dataSnapshot=new DataSnapshot(line);                emit eventDataChanged(dataSnapshot);            }        }    }    reply->readAll();}void Firebase::onReadyRead(QNetworkReply *reply){    /*qDebug()<<"incoming data";    qDebug()<<reply->readAll();*/}void Firebase::replyFinished(QNetworkReply *reply){    //qDebug()<<reply->readAll();    QString data=QString(reply->readAll());    emit eventResponseReady(data);}void Firebase::setValue(QString strVal){    //Json data creation    QNetworkRequest request(buildPath(1));    request.setHeader(QNetworkRequest::ContentTypeHeader,                      "application/x-www-form-urlencoded");    QBuffer *buffer=new QBuffer();    buffer->open((QBuffer::ReadWrite));    buffer->write(createJson(strVal).toUtf8());    buffer->seek(0);    /*     * To be able to send "PATCH" request sendCustomRequest method is used.     * sendCustomRequest requires a QIOdevice so QBuffer is used.     * I had to seek 0 because it starts reading where it paused.     */    manager->sendCustomRequest(request,"PATCH",buffer);    buffer->close();}void Firebase::getValue(){    QNetworkRequest request(buildPath(0));    manager->get(request);}void Firebase::listenEvents(){    open(buildPath(0));}void Firebase::deleteValue(){    QNetworkRequest request(buildPath(0));    manager->deleteResource(request);}QString Firebase::createJson(QString str){    QString data=QString(QString("{").append("\"").append(latestNode).append("\"").append(":").append("\"").append(str).append("\"").append(QString("}")));    return data;}QString Firebase::buildPath(int mode){    QString destination="";    if(mode)    {        host.replace(QString("/").append(latestNode).append("/"),"");        destination                .append(host)                .append("/.json");    }    else    {        destination                .append(host)                .append(currentNode)                .append(".json");    }    if(!firebaseToken.isEmpty())        destination.append("?auth=").append(firebaseToken);    //根据你的实际情况，写destination    return destination;}QByteArray Firebase::trimValue(const QByteArray &line) const{    QByteArray value;    int index = line.indexOf(':');    if (index > 0)        value = line.right(line.size() - index  - 1);    return value.trimmed();}