Unable connect 2 classes of signals and Slots
I am transferring from one category to the other channels.
Their memories are:
.hpp files------------
class A::public QObject{
Q_OBJECT
signals:
void emitMsg(QString* msg);
}
class B::public QObject{
signals:
void emitA(QString* msgA);
public slots:
void logMsg(QString* msg);
}
---------.cpp files
classB::classB(){
bool temp= connect(objB,SIGNAL(emitA(QString*)),this,SLOT(logMsg(QString*)));
qDebug()<<"value="<
But even running in the device debug mode Dev Alpha, the application displays a value in the log messages, or moves out of the screen dark splash.
Please adivse, what is missing from the other code?
Is there a way by which the slots and signals of different classes could be connected to data transfer?
Create a Downloader object?
(BTW, I always initialize pointers to 0 in the initializer list.) Who does this kind of obvious thing, and it has the same thing for debug and release)
Stuart
Tags: BlackBerry Developers
Similar Questions
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Try to test something after that someone wanted to help with the signals and Slots sorta. I know there is an alternative to this, but I'm trying to understand why this does not work when doing it this way. It relies, it works but it does not fly... I mean this isn't the trigger of the SLOT feature... Not even sure if she sends a SIGNAL...
Thanks in advance.
file:
// Default empty project template
#ifndef Testme_HPP_
#define Testme_HPP_
#include
namespace bb { namespace cascades { class Application; }}
namespace bb { namespace cascades { class TouchEvent; }}
namespace bb { namespace cascades { class Container; }}
namespace bb { namespace cascades { class ImageView; }}
/*!
* @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 Testme : public QObject
{
Q_OBJECT
public:
Testme(bb::cascades::Application *app);
virtual ~Testme() {}
public slots:
void handleTouch(bb::cascades::TouchEvent* tEvent);
private:
bb::cascades::Container* rootContainer;
bb::cascades::ImageView* imgView;
};
#endif /* Testme_HPP_ */
.cpp file:
// Default empty project template
#include "Testme.hpp"
#include
#include
#include
#include
#include
#include
using namespace bb::cascades;
Testme::Testme(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);
QmlDocument *qml2 = QmlDocument::create("asset:///Testingme.qml").parent(this);
// create root object for the UI
AbstractPane *root = qml->createRootObject();
// set created root object as a scene
app->setScene(root);
if (!qml2->hasErrors()) {
rootContainer = qml2->createRootObject();
if (rootContainer) {
imgView = rootContainer->findChild("imgView");
if (imgView) {
bool res = QObject::connect(imgView, SIGNAL(touch(bb::cascades::TouchEvent*)),
this, SLOT(handleTouch(bb::cascades::TouchEvent*)));
Q_ASSERT(res);
Q_UNUSED(res);
fprintf(stderr, "Height: %f and width: %f\n",
imgView->preferredHeight(), imgView->preferredWidth());
} else {
fprintf(stderr, "No ImageView\n");
}
} else {
fprintf(stderr, "No root container\n");
}
} else {
fprintf(stderr, "QML2 has errors\n");
}
}
void Testme::handleTouch(TouchEvent *tEvent)
{
fprintf(stderr, "Touch Touch Touch\n");
}
hand file. QML:
// Default empty project template
import bb.cascades 1.0
// creates one page with a label
Page {
Container {
layout: StackLayout {}
Label {
text: qsTr("Hello World")
}
Testingme {
id: testingMe
}
}
}
File Testingme.QML:
import bb.cascades 1.0
Container {
objectName: "rootContainer"
horizontalAlignment: HorizontalAlignment.Center
verticalAlignment: VerticalAlignment.Center
background: Color.create ("#262626")
ImageView {
objectName: "imgView"
imageSource: "asset:///belligerent.png"
preferredHeight: 200
preferredWidth: 200
}
}
The main file is the one you get when you create a new project of Cascades Standard default. So, what's wrong with this picture? Or of images, other than the fact that I use the png of bellicose blocks file...
-Edit (this and some formatting).
I'm using the Simulator, so don't know if it would make a difference. BTW, I even tried to use a checkbox, and which does not trigger anything.
Well, it works eventually got. I'm still not sure where to check signals during debugging, however.
Although there are two files QML, the first main QML object is one that should be used. I used the 2nd QML file object that was wrong, even if the image is in the 2nd...
-
Problem, the signals and Slots
Hi, as I posted in one of my other posts I have following problem with signals and messages and would be nice if someone could clarify anything that I don't seem to be able to find what the problem of the outputs.
I have the code:
void MYNetworkClass::requestFinished(QNetworkReply* reply)
{
// Check the network reply for errors
if (reply->error() == QNetworkReply::NoError)
{
// read response
const QByteArray response(reply->readAll());
qDebug() <<"Response: "<< response;
JsonDataAccess jda;
QVariantMap results = jda.loadFromBuffer(response).toMap();
QVariantMap data = results.value("SomeData").toMap();
emit signalSuccess(data); // I reach here ....
// however actually when I click "Step Over" in debug mode, and try to exit the function// afterwards I get such "error" saying: No source available for "QMetaObject::activate() at 0xb9668da7" - highlighted in red.
}
else
{
qDebug() << "\n Problem with the network";
qDebug() << "\n" << reply->errorString();
}
In MyNetwork class I also added the definition of signal in the header file:
signals:
void signalSuccess(QVariantMap result);
Now also when someone calls an object MyNetworkClass method which calls requestFinished,.
I want to catch the signal which is emitted by the requestFinished - as shown above.
MyNetworkClass *network = new MyNetworkClass();
QMap params;
params.insert("username", userEmail);
bool res = QObject::connect(network, SIGNAL(signalSuccess(QVariantMap)), this, SLOT(SomeSlotForSignal(QVariantMap)));
Q_ASSERT(res);
Q_UNUSED(res);
network->makePostRequest("Login");
My problem is that the SomeSlotForSignal slot never is called... 
(even if the signal is issued constitute requestFinished method and as I stated SomeSlotForSignal as a crack in the header file...) What can be problem? Any help? Thank you.
I guess I solved the problem.
The code I presented previously registered function
F of a class B:
void B::f()
{
MyNetworkClass *network = new MyNetworkClass();
QMap params;
params.insert("username", userEmail);
bool res = QObject::connect(network, SIGNAL(signalSuccess(QVariantMap)), this, SLOT(SomeSlotForSignal(QVariantMap)));
Q_ASSERT(res);
Q_UNUSED(res);
network->makePostRequest("Login");
}
Then the function f is called to:
B object;
object.f();
The problem was I think that when the server responded "object" was destroyed from the stack. When I replaced the above code, with
B* object = new B();
object->f();
I think it works now......
-
Why connecttng signals and slots of an element of action gets segfault
I add an action item to a page. For some reasong I had to disconnect the item, delete and re-create, and then reconnect it. But I am getting exception when I try to pull the plug. If I omit the disconnection then I get exception when connecting. My code is below
if(addAllRules)
{
disconnect(addAllRules,SIGNAL(triggered()),this,SLOT(onTriggeredAddRuleActionAllRules()));
delete(addAllRules);
}
addAllRules = ActionItem::create().title("Add Rule").enabled(true);
allRulesPage->addAction(addAllRules, ActionBarPlacement::OnBar);
connect(addAllRules,SIGNAL(triggered()),this,SLOT(onTriggeredAddRuleActionAllRules()));
Have you tried cleaning and reconstruction project?
You will need to find the exact location of the crash using a debugger or newspapers, or analyze a dump core after accident.
This can also occur due to memory corruption. If the memory is damaged from somewhere, the accident can happen in completely independent place. In this case, try commenting on most of the features of the application until the QTimer started working restaurant then step by step.
-
Error while establishing an Http connection. Once finished signal request is displayed, no call slot
I'm instantiated MyNetwork class on click of a button in my app class.
Therefore it is called class constructor MyNetwork in which I'm checking the availability of the network.
Once found an available network, a sendRequest() method is called that a get request is initialized.
And the QNetworkAccessManager object emits a finished(QNetworkReply *) signal is connected to a slot (requestFinished(QNetworkReply *reply)) of this class of MyNetwork .
When the user clicks on the button in the file app.cpp, create an object of class MyNetwork and checking the availability of the network works within its constructor.
also the connect() method returns true , but sinking ever crack (requestFinished(QNetworkReply *reply)) method where I am Manager of my answer.
MyNetwork. HPP
#ifndef MYNETWORK_HPP_
#define MYNETWORK_HPP_
#include
#include
#include
#include
#include
#include
#include
#include
/*!
* @brief Network Connection Implementation
*/
class MyNetwork:public QObject
{
Q_OBJECT;
public :
MyNetwork();
/*!
* @brief Method to create and send request
*/
void sendRequest();
/*!
* @brief Method to check if network is available
*/
bool isNetworkAvailable();
private slots:
void requestFinished(QNetworkReply *reply);
};
#endif /* MYNETWORK_HPP_ */
MyNetwork.cpp
#include
#include
#include
#include
QNetworkAccessManager *mNetworkMgr;
MyNetwork::MyNetwork() {
if (isNetworkAvailable()) {
sendRequest();
}
}
void MyNetwork::sendRequest() {
mNetworkMgr = new QNetworkAccessManager(this);
QNetworkReply *reply =
mNetworkMgr->get(
QNetworkRequest(
QUrl(
"http://developer.blackberry.com/cascades/files/documentation/device_platform/networking/model.xml")));
if (reply) {
qDebug() << "Reply from server is " << reply;
}
bool resFromServer = connect(mNetworkMgr, SIGNAL(finished(QNetworkReply*)),
this, SLOT(requestFinished(QNetworkReply*)));
qDebug() << "Connection is success : ? : " << resFromServer;
Q_ASSERT(resFromServer);
Q_UNUSED(resFromServer);
}
void MyNetwork::requestFinished(QNetworkReply *reply) { if (reply) {
if (reply->error() == QNetworkReply::NoError) {
qDebug() << "No Error";
} else {
int httpStatus = reply->attribute(
QNetworkRequest::HttpStatusCodeAttribute).toInt();
qDebug() << "Error and the code is " << httpStatus;
}
reply->deleteLater();
} else {
qDebug() << "Reply comes out to be null";
}
}
bool MyNetwork::isNetworkAvailable() {
QNetworkConfigurationManager netMgr;
QList mNetList = netMgr.allConfigurations(
QNetworkConfiguration::Active);
if (mNetList.count() > 0) {
if (netMgr.isOnline()) {
return true;
} else {
return false;
}
} else {
return false;
}
}
Hmm. I just did a quick test for the for you network code.
I movedbool resFromServer = connect(mNetworkMgr, SIGNAL(finished(QNetworkReply*)),
this, SLOT(requestFinished(QNetworkReply*)));
to be before
QNetworkReply *reply =
mNetworkMgr->get(
QNetworkRequest(
QUrl(
"http://developer.blackberry.com/cascades/files/documentation/device_platform/networking/model.xml")));
in my test.
As I mentioned to signal before start us sending application network.
I got "Error no." in the newspaper which seemed to have indicated that the signal/slot was triggerred properly in my case.
Question for you:
How did you create your object "MyNetwork"?
is the object still alive when the network request signal is triggerred?
Maybe the code for create/destorying your object "MyNetwork" segment will be useful
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BlackBerry BB Z30 Z30 connects to non-existent WiFi signal and does not accept the real
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However Z30, by listing the networks begins with
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Z30 then begins the list of available networks
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at the bottom of the list is
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I can connect to xxx2 - 2G (new 'Saved' network), but after a while (maybe 10 minutes) the phone slides into the ghost...
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