我尝试在解析后浏览页面，但是在我从服务器获取响应之前，从Qml文件调用方法getLoginData()并得到false，因为在调用此函数响应时，不是从服务器获取的，当我再次单击按钮时，函数是调用，我得到了准确的结果，因为这一次我已经得到了结果。所以请帮我解决。
My code...
[B]main.qml[/B]
enter code here
// Navigation pane project template
import bb.cascades 1.0
import bb.system 1.0
NavigationPane {
id: navigationPane
objectName: "navigationPaneQml"
Page {
id: loginPage
objectName : "pageQml"
Container {
id: container1
background: Color.Green
leftPadding: 10
rightPadding: 10
topPadding: 10
layout: StackLayout {
orientation:LayoutOrientation.TopToBottom
}
TextField {
id: usernameBox
objectName: "textFieldRetrived"
hintText: "Enter Your Mobile Number"
topPadding: 10
inputMode: TextFieldInputMode.PhoneNumber
preferredWidth: maxWidth
input {
flags: TextInputFlag.PredictionOff |
TextInputFlag.AutoCorrectionOff
}
// validator: IntValidator {
// bottom: 0
// top: 9999999999
// }
validator: Validator {
mode: ValidationMode.Immediate
errorMessage: "Your username must be 10 characters."
onValidate: {
if (usernameBox.text.length < 10 || usernameBox.text.length > 10) state = ValidationState.Invalid;
else state = ValidationState.Valid;
}
}
// validator: RegExpValidator {
// mode: ValidationMode.Immediate
// regExp: /\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/
// onValidate: {
// if (usernameBox.text.length <= 10) state = ValidationState.Valid;
// else state = ValidationState.Invalid;
// }
// }
}
Button {
id: submitButton
objectName : submitButtonQml
horizontalAlignment: HorizontalAlignment.Center
// verticalAlignment: VerticalAlignment.Center
text: qsTr("Submit")
preferredWidth: minWidth
// imageSource: "asset:///images/picture1thumb.png"
attachedObjects: [
SystemToast {
id: invalidUsername
body: "Invalid Username"
onFinished: {
// Application.quit();
}
},
SystemToast {
id: networkNotAvalable
body: "Network not Avalable"
onFinished: {
// Application.quit();
}
},
SystemToast {
id: invalidToast
body: "Not a valid input"
onFinished: {
// Application.quit();
}
},
ComponentDefinition {
id: pageDefinition
source: "splash.qml"
}
]
onClicked: {
if(usernameBox.text!= null && usernameBox.text!=""){
if(app.isNetworkAvailable()){
app.initiateRequest(usernameBox.text)
if (app.getLoginData() == "True"){
var newPage = pageDefinition.createObject();
navigationPane.push(newPage);
}else{
invalidUsername.show()
}
}else {
networkNotAvalable.show()
}
}else{
invalidToast.show()
}
}
}
TextArea {
id: chat
objectName: "textArea"
inputMode: TextAreaInputMode.Default
}
Container {
id: cntrUpdates
horizontalAlignment: HorizontalAlignment.Center
// verticalAlignment: VerticalAlignment.Top
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
preferredWidth: 1280.0
leftPadding: 90.0
topPadding: 20.0
Label {
objectName: "lblRetrieve"
text: "Retrieving contact list ..."
textStyle.textAlign: TextAlign.Right
verticalAlignment: VerticalAlignment.Center
}
// The activity indicator has an object name set so that
// we can start and stop it from C++ code.
ActivityIndicator {
objectName: "indicator"
running: false
}
}
}
}
onCreationCompleted: {
// this slot is called when declarative scene is created
// write post creation initialization here
console.log("NavigationPane - onCreationCompleted()");
// enable layout to adapt to the device rotation
// don't forget to enable screen rotation in bar-bescriptor.xml (Application->Orientation->Auto-orient)
OrientationSupport.supportedDisplayOrientation = SupportedDisplayOrientation.All;
}
}
[B]DemoProject2.cpp[/B]
// Navigation pane project template
#include "DemoProject2.hpp"
#include <bb/cascades/Application>
#include <bb/cascades/QmlDocument>
#include <bb/cascades/AbstractPane>
#include <QIODevice>
#include <bb/cascades/XmlDataModel>
#include <bb/cascades/Color>
#include <bps/bps.h>
#include <bps/netstatus.h>
#include <bps/locale.h>
#include <QXmlStreamReader>
#include <QFile>
#include <QDir>
#include <QDebug>
#include <iostream>
#include <QtCore/QCoreApplication>
#include <QTextStream>
#include <QDomDocument>
#include <QDomNodeList>
#include <QtXml/qxml.h>
#include <QString>
#include <bb/cascades/ValidationMode>
#include <bb/cascades/Validator>
#include <bb/system/SystemToast>
#include <bb/system/SystemUiPosition>
#include <QtCore/QDebug>
using namespace bb::cascades;
using namespace bb::system;
DemoProject2::DemoProject2(bb::cascades::Application *app)
: QObject(app)
{
// create scene document from main.qml asset
// set parent to created document to ensure it exists for the whole application lifetime
QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
// Expose this class to QML so that we can call it's functions from C++ code.
qml->setContextProperty("app", this);
// create root object for the UI
AbstractPane *root = qml->createRootObject<AbstractPane>();
// set created root object as a scene
// Retrieve the activity indicator from QML so that we can start
// and stop it from C++ code.
myActivityIndicator = root->findChild<ActivityIndicator*>("indicator");
myTextField = root->findChild<TextField*>("textFieldRetrived");
myLabel = root->findChild<Label*>("lblRetrieve");
textArea = root->findChild<TextArea*>("textArea");
submitButton = root->findChild<Button*>("submitButtonQml");
// navigationPane = root->findChild<NavigationPane*>("navigationPaneQml");
// root = qml->createRootObject<NavigationPane>();
// QmlDocument *qml1 = QmlDocument::create("asset:///splash.qml").parent(this);
//// mNewPage = new Page();
// mNewPage = qml1->createRootObject<Page>();
myNetworkAccessManager = new QNetworkAccessManager(this);
connect(myNetworkAccessManager, SIGNAL(finished(QNetworkReply*)),
this, SLOT(requestFinished(QNetworkReply*)));
// Create a file in the file system that we can use to save the data model.
myFile = new QFile("data/model.xml");
app->setScene(root);
}
bool DemoProject2::isNetworkAvailable() {
QNetworkConfigurationManager netMgr;
QList<QNetworkConfiguration> mNetList = netMgr.allConfigurations(
QNetworkConfiguration::Active);
if (mNetList.count() > 0) {
if (netMgr.isOnline()) {
return true;
} else {
return false;
}
} else {
return false;
}
}
void DemoProject2::initiateRequest(QString text){
text.trimmed();
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","hhhh");
isComplete = false;
// Start the activity indicator.
myActivityIndicator->start();
myLabel->setVisible(true);
myLabel->setText("Retrieving contact list ...");
// Create and send the network request.
QNetworkRequest request = QNetworkRequest();
request.setUrl(QUrl("******************"));
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","00");
myNetworkAccessManager->get(request);
}
void DemoProject2::requestFinished(QNetworkReply* reply){
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","NUM 0");
myActivityIndicator->stop();
myLabel->setVisible(false);
// Check the network reply for errors.
if (reply->error() == QNetworkReply::NoError){
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","NUM 1");
/****** Sax Parsing code Section..................******/
QByteArray data = reply->readAll();
xmlSaxParser(data);
/****** dom parsing code section ........******/
// QByteArray byteArray = reply->readAll();
// xmlDomParser(byteArray);
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","NUM 2");
reply->deleteLater();
}
}
bool DemoProject2:: getCompleteVariable(){
return isComplete;
}
void DemoProject2 :: setLoginData(QString data){
loginData = data;
}
QString DemoProject2 :: getLoginData(){
while(!getCompleteVariable()){
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","shivang");
}
return loginData;
}
void DemoProject2:: xmlSaxParser(QByteArray data){
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","NUM 3");
// The XML stream reader that is used to extract the articles from the RSS feed
QXmlStreamReader m_xml;
m_xml.addData(data);
QString currentTag = "";
QString linkString;
QString titleString;
while (!m_xml.atEnd())
{
m_xml.readNext();
if (m_xml.isStartElement())
{
if (m_xml.name() == "contacts"){
linkString = m_xml.attributes().value("title").toString();
currentTag = m_xml.name().toString();
myLabel->setVisible(true);
myLabel->setText(linkString);
}else if(m_xml.name() == "return"){
currentTag = m_xml.name().toString();
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","ns:return");
}
}
else if (m_xml.isEndElement())
{
if (m_xml.name() == "return")
{
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","return");
// linkString = m_xml.attributes().value("rss:about").toString();
titleString.clear();
// linkString.clear();
}
} else if (m_xml.isCharacters() && !m_xml.isWhitespace())
{
if (currentTag == "return"){
titleString += m_xml.text().toString();
myLabel->setVisible(true);
myLabel->setText(titleString);
setLoginData(titleString);
// textArea->setText(titleString);
// currentTag = "";
}
}
}
if (m_xml.error() && m_xml.error() != QXmlStreamReader::PrematureEndOfDocumentError) {
// m_feeds.append(
// QString::fromLatin1("XML ERROR: %1: %2").arg(m_xml.lineNumber()).arg(m_xml.errorString()));
}
fprintf(stderr, "Debug::::::::::::::::::::::::::: %s\n","NUM 4");
// navigationPane->push(mNewPage);
isComplete = true;
}
[B]DemoProject2.hpp[/B]
// Navigation pane project template
#ifndef DemoProject2_HPP_
#define DemoProject2_HPP_
#include <QObject>
#include <QFile>
#include <QString>
#include <bb/cascades/ActivityIndicator>
#include <bb/cascades/TextField>
#include <bb/AbstractBpsEventHandler>
#include <bb/cascades/Application>
#include <bb/cascades/Label>
#include <bb/cascades/TextArea>
#include <bb/cascades/Button>
#include <bb/cascades/NavigationPane>
#include <bb/cascades/Page>
using namespace bb::cascades;
namespace bb { namespace cascades { class Application; }}
/*!
* @brief Application pane object
*
*Use this object to create and init app UI, to create context objects, to register the new meta types etc.
*/
class DemoProject2 : public QObject
{
Q_OBJECT
public:
DemoProject2(bb::cascades::Application *app);
virtual ~DemoProject2() {}
// void parseXml (QByteArray data);
Q_INVOKABLE void initiateRequest(QString text);
Q_INVOKABLE bool isNetworkAvailable();
Q_INVOKABLE void xmlSaxParser(QByteArray data);
Q_INVOKABLE void xmlDomParser(QByteArray data);
Q_INVOKABLE QString getLoginData();
Q_INVOKABLE void setLoginData(QString data);
Q_INVOKABLE bool getCompleteVariable();
// NavigationPane *root;
// signals:
// void networkStatusUpdated(bool status, QString type);
private slots:
void requestFinished(QNetworkReply* reply);
// void networkStatusUpdateHandler(bool status, QString type);
private:
bb::cascades::TextField *myTextField;
bb::cascades::ActivityIndicator *myActivityIndicator;
bb::cascades::Label *myLabel;
bb::cascades::TextArea *textArea;
bb::cascades::Button *submitButton;
// bb::cascades::NavigationPane* navigationPane;
// bb::cascades:: Page* mNewPage;
QNetworkAccessManager *myNetworkAccessManager;
QFile *myFile;
QString loginData;
QByteArray data;
bool isComplete;
// Page* mNewPage;
// StatusEvent *statusEvent;
};
#endif /* DemoProject2_HPP_ */
最佳答案
使用事件循环...
QNetworkAccessManager* netManager = new QNetworkAccessManager();
QUrl myurl("http://******");
QNetworkRequest req(myurl);
QNetworkReply* ipReply = netManager->get(req);
QEventLoop eventLoop;
QObject::connect(ipReply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
eventLoop.exec();
std::cout << "finished" << std::endl; //request finished here
requestFinished(ipReply);
关于c++ - 在BB 10中解析后导航页面，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/17122562/