Mobile and Embedded

Windows AppData Try to run it (Qt Creator and build) with administrative rights :)

@egg.nut I met the same question,how do you solve it?

the code #ifndef TBLUETOOTHMANAGER_H #define TBLUETOOTHMANAGER_H #include <QObject> #include<QTimer> #include <qbluetoothaddress.h> #include <qbluetoothdevicediscoveryagent.h> #include <qbluetoothlocaldevice.h> #include <QBluetoothDeviceInfo> #include<QBluetoothSocket> #include<QBluetoothServiceDiscoveryAgent> #define SPP_UUID QString("00001101-0000-1000-8000-00805F9B34FB") class TbluetoothManager : public QObject { Q_OBJECT Q_PROPERTY(bool comOk READ comOk WRITE setComOk NOTIFY comOkChanged) Q_PROPERTY(QList<QString> bluedevices READ bluedevices WRITE setBluedevices NOTIFY bluedevicesChanged) QList<QString> m_bluedevices; bool m_comOk; public: explicit TbluetoothManager(QObject *parent = 0); QList<QString> bluedevices() const; bool comOk() const; signals: void onComData(QByteArray data); void bluedevicesChanged(QList<QString> bluedevices); void deviceDiscovered(const QBluetoothDeviceInfo &info); void comOkChanged(bool comOk); public slots: void scanBluetoothDevices(); void connectComDevices(QString device); void sl_deviceDiscovered(const QBluetoothDeviceInfo &info); void sl_comConnected(); void sl_comDisconnected(); void sl_comReadyRead(); void sl_comStateChanged(QBluetoothSocket::SocketState state); void sl_comError(QBluetoothSocket::SocketError error); void sl_serviceDiscovered(const QBluetoothServiceInfo &info); void sl_comConnectToService(); //auto gen void setBluedevices(QList<QString> bluedevices); void setComOk(bool comOk); protected: QBluetoothDeviceDiscoveryAgent * discoveryAgent; QBluetoothSocket* m_local_bluetooth_socket; QBluetoothServiceDiscoveryAgent* m_bluetooth_service_disc; QString m_com_device_addr; QBluetoothServiceInfo m_com_service_info; }; #endif // TBLUETOOTHMANAGER_H cpp: #include "tbluetoothmanager.h" #include<QBluetoothServiceInfo> #include<QDebug> TbluetoothManager::TbluetoothManager(QObject *parent) : QObject(parent) { discoveryAgent= new QBluetoothDeviceDiscoveryAgent(this); connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)), this, SLOT(sl_deviceDiscovered(QBluetoothDeviceInfo))); m_local_bluetooth_socket=0; m_bluetooth_service_disc= new QBluetoothServiceDiscoveryAgent(this); connect(m_bluetooth_service_disc,SIGNAL(serviceDiscovered(const QBluetoothServiceInfo&)),SLOT(sl_serviceDiscovered(const QBluetoothServiceInfo&))); } QList<QString> TbluetoothManager::bluedevices() const { return m_bluedevices; } bool TbluetoothManager::comOk() const { return m_comOk; } void TbluetoothManager::scanBluetoothDevices() { //qDebug()<<"start scan bluetooth"; m_bluedevices.clear(); emit bluedevicesChanged(m_bluedevices); discoveryAgent->start(); } void TbluetoothManager::connectComDevices(QString device) { int last_pos=device.lastIndexOf("||"); if(last_pos<0){ qDebug()<<"can not found sep in device string"; return; } int last_second_pos=device.lastIndexOf("||",last_pos-1); if(last_second_pos<0){ qDebug()<<"can not found second sep in device string"; return; } m_com_device_addr=device.mid(last_second_pos+2,last_pos-last_second_pos-2); //qDebug()<< "device addr:"<<device_addr ; QString device_uuid=device.mid(last_pos+2,100); //qDebug()<< "device uuid:"<<device_uuid ; m_bluetooth_service_disc->setRemoteAddress(QBluetoothAddress(m_com_device_addr)); m_bluetooth_service_disc->start(); } void TbluetoothManager::sl_deviceDiscovered(const QBluetoothDeviceInfo &info) { QString device=info.name()+"||"+info.address().toString()+"||"+ info.deviceUuid().toString(); m_bluedevices.append(device); emit bluedevicesChanged(m_bluedevices); qDebug()<<"one bluetooth device:"<<device; connectComDevices(device); } void TbluetoothManager::sl_comConnected() { qDebug()<< "com connected" ; setComOk(true); } void TbluetoothManager::sl_comDisconnected() { qDebug()<< "com disconnected" ; setComOk(false); } void TbluetoothManager::sl_comReadyRead() { QByteArray data=m_local_bluetooth_socket->readAll(); qDebug()<< "com rev:" <<data; } void TbluetoothManager::sl_comStateChanged(QBluetoothSocket::SocketState state) { qDebug()<< "comm state:" <<state; } void TbluetoothManager::sl_comError(QBluetoothSocket::SocketError error) { qDebug()<< "com error:" <<error; } void TbluetoothManager::sl_serviceDiscovered(const QBluetoothServiceInfo &info) { qDebug()<< "service addr:" <<info.device().address().toString()<<"mcom addr:"<<m_com_device_addr <<"service uuid:"<<info.serviceUuid().toString(); if (info.device().address().toString()==m_com_device_addr) { QTimer::singleShot(10,[&]{ qDebug()<< "stop service disc" ; m_bluetooth_service_disc->stop();; }); m_com_service_info=info; QTimer::singleShot(1000,this,SLOT(sl_comConnectToService())); //m_local_bluetooth_socket->connectToService(info); } } void TbluetoothManager::sl_comConnectToService() { qDebug()<< "connect to addr:"<<m_com_service_info.device().address().toString()<<"suuid:"<<m_com_service_info.serviceUuid().toString() ; if (m_local_bluetooth_socket) { m_local_bluetooth_socket->deleteLater(); } m_local_bluetooth_socket=new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol); m_local_bluetooth_socket->setPreferredSecurityFlags(QBluetooth::NoSecurity); connect(m_local_bluetooth_socket,SIGNAL(connected()), SLOT(sl_comConnected())); connect(m_local_bluetooth_socket,SIGNAL(disconnected()),SLOT(sl_comDisconnected())); connect(m_local_bluetooth_socket,SIGNAL(readyRead()),SLOT(sl_comReadyRead())); connect(m_local_bluetooth_socket,SIGNAL(stateChanged(QBluetoothSocket::SocketState)),SLOT(sl_comStateChanged(QBluetoothSocket::SocketState))); connect(m_local_bluetooth_socket,SIGNAL(error(QBluetoothSocket::SocketError)),SLOT(sl_comError(QBluetoothSocket::SocketError))); //m_local_bluetooth_socket->connectToService(m_com_service_info); m_local_bluetooth_socket->connectToService(m_com_service_info.device().address(), QBluetoothUuid(SPP_UUID)); } void TbluetoothManager::setBluedevices(QList<QString> bluedevices) { if (m_bluedevices == bluedevices) return; m_bluedevices = bluedevices; emit bluedevicesChanged(bluedevices); } void TbluetoothManager::setComOk(bool comOk) { if (m_comOk == comOk) return; m_comOk = comOk; emit comOkChanged(comOk); }

@raven-worx This is kinda cool! Thanks for the idea. I am going to try this as well. I will keep the results posted. here. Thanks!

Hi, Depends on the platform See number 1 What objects ? How are you creating them ? What's their lifetime ? In any case, KDAB's GammaRay is a very interesting tool. Valgrind is another one.

@kd_wala Thanks. I solved the problem: void TestClass::toast_message(const QString& text, Duration duration) { QtAndroid::runOnAndroidThread([&] { QAndroidJniObject _text = QAndroidJniObject::fromString(text); QAndroidJniObject toast = QAndroidJniObject::callStaticObjectMethod( "android/widget/Toast", "makeText", "(Landroid/content/Context;Ljava/lang/CharSequence;I)Landroid/widget/Toast;", QtAndroid::androidActivity().object(), _text.object(), jint(duration)); toast.callMethod<void>("show"); }); } This is running!

If you want to follow this bug here is the link: https://bugreports.qt.io/browse/QTBUG-55085 RickLinux

For everyone else who is have the same problem, this did the trick: .pro file: android { data.files = db/flags.sqlite data.path = /assets/db INSTALLS += data } .cpp file QFile dfile("assets:/db/flags.sqlite"); QString filePath = QStandardPaths::writableLocation( QStandardPaths::StandardLocation::AppLocalDataLocation ); filePath.append( "/flags.sqlite"); if (dfile.exists()) { if( QFile::exists( filePath ) ) QFile::remove( filePath ); if( dfile.copy( filePath ) ) QFile::setPermissions( filePath, QFile::WriteOwner | QFile::ReadOwner ); } d->database.setDatabaseName( filePath ); #else d->database.setDatabaseName( "db/flags.sqlite" ); #endif if( d->database.open() ) { qDebug( "DB open successful "); QSqlQuery q(d->database); q.exec("SELECT * from flags"); q.last(); d->dbSize = q.at() + 1; } else { qDebug( "DB failed" ); } } Link: Click me

I think, if you don't use Java code via Android Extras relying on a higher API level, you can start with the lowest one supported by Qt this means 18 for Qt 5.7 can someone confirm ?

@DRoscoe Thanks so much, I really appreciate you taking time to respond!

@kumararajas From what I know, Milian Wolff from KDAB is working on bringing newer WebKit to Qt 4, ping milian on #qt-labs to know if this option is available and how much it would cost. It should also be possible to bring Qt 4 support to https://github.com/annulen/webkit, but you would need to hire Milian or someone else

I met the same problem as you, I had solved the error by uninstalling two diffirent version Qt creators in my pc. Keep the last version Qt creator on my windows8.1. I tried , builded and ran, it installed successfully the apk on my android device.

@jsulm The problem is CONFIGURING QtCreator. Apparently no one here knows how to do that for windows to pi cross compile and debug. I gave up on QT and have succeeded to do just that with Eclipse, their suggested toolchain and detailed configuration docs. So for my purposes, no need to continue this thread.

Hi and welcome to devnet, Since your are new to all of that, I'd recommend asking to use a virtual machine with Linux on it. It will make the setup way easier that way.

Hi, I found your topic and i have a problem with a SIGSEGV at the start of qt application when i used gdb. Your patch work with a previous problem i have with breakpoints but no with this one so have you an idea ? I'm using an imx6 platform with EGLFS and when upgrading Qt from 5.3.2 to 5.5.1, I can't start a debug. I try to backtrace in qtcreator but i can't find anything to help. Thanks, Here it's a part of gdb log. >909-exec-run Process AW_APP created; pid = 1370 >library-loaded,id="/lib/ld-linux-armhf.so.3",target-name="/lib/ld-linux-armhf.so.3",host-name="/opt/fsl-imx-fb/4.1.15-1.2.0/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/lib/ld-linux-armhf.so.3",symbols-loaded="0",thread-group="i1" Library /lib/ld-linux-armhf.so.3 loaded >909^running dNOTE: ENGINE RUN AND INFERIOR RUN OK sRunning. dState changed from EngineRunRequested(7) to InferiorRunOk(11) [master] dINFERIOR STARTED sDémarrage de l'application >*running,thread-id="all" dNOTE: INFERIOR STILL RUNNING IN STATE InferiorRunOk. >~"\nProgram received signal " >~"SIGSEGV, Segmentation fault.\n" >~"0x4dca9e24 in ?? ()\n" >*stopped,reason="signal-received",signal-name="SIGSEGV",signal-meaning="Segmentation fault",frame={addr="0x4dca9e24",func="??",args=[]},thread-id="1",stopped-threads="all",core="0" dNOTE: INFERIOR SPONTANEOUS STOP sStopped. > 914bt full >&"bt full\n" >~"#-1 0x4dca9e24 in ?? ()\n" >~"No symbol table info available.\n" >&"warning: Unable to restore previously selected frame.\n" Unable to restore previously selected frame. >914^done