Qt中簡單使用Firebase
阿新 • • 發佈：2018-12-20
上一篇對Firebase進行了簡要的介紹。
今天對Firebase進行簡單的應用。在qt中，因為我不會Android和ios開發。
最主要的就是寫一個類，Firebase.
直接程式碼： firebase.h
#ifndef FIREBASE_H#define FIREBASE_H#include <QObject>#include <QtNetwork/QNetworkAccessManager>#include <QtNetwork/QNetworkReply>#include <QtNetwork/QNetworkRequest>#include <QUrl> - 1
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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); //根據你的實際情況，寫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();}- 1
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