Cannot send SMS the second time. Need help with QtMobility problem!

[ravi4frenz]

Hi all,
I'm developing a program for my final year project in Nokia using Qt. In that i need to send an sms using Qt Mobility. I used the code below
mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QObject::connect(&service,SIGNAL(stateChanged(QMessageService::State)),this,SLOT(stateChanged(QMessageService::State)));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_toolButton_clicked()
{
    QMessage message;
    message.setType(QMessage::Sms);
    message.setTo(QMessageAddress(QMessageAddress::Phone,"+919791504579"));
    message.setBody("Hi this is the message");
    if(service.send(message))
    {
        QMessageBox::information(this,"","Message Sent!");
    }

}

void MainWindow::stateChanged(QMessageService::State s)
{
    if(s==QMessageService::ActiveState)
        QMessageBox::information(this,"State","Active State");
    if(s==QMessageService::InactiveState)
        QMessageBox::information(this,"State","Inactive State");
    if(s==QMessageService::CanceledState)
        QMessageBox::information(this,"State","Cancelled State");
    else
        QMessageBox::information(this,"State","Finished");
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QMessage>
#include <QMessageService>
#include <QMessageAddress>
#include <QMessageBox>

QTM_USE_NAMESPACE

namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QMessageService service;

private slots:
    void on_toolButton_clicked();
    void stateChanged(QMessageService::State);
};

#endif // MAINWINDOW_H

and when clicking the button is shows that messsage is sent, but when I click the button for the second time the Application Output in the Qt Creator shows that Action is currently busy and after pressing the exit it shows this error
QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.
I think I,m using Qt Mobility version 4.6. Is there anything that I have done wrong. Kindly help me because I have less time to finish my final year project.

[billbonney]

You are creating your message object as an auto variable (i.e on the stack) and then it gets destroyed when your on_toolButton_clicked method exits. This is the problem. If you declare it as a member data for your class it will probably work as expected.

QMessageService send takes a reference. As a general rules, unless documentation states otherwise, methods that take a reference require you to maintain the object in memory until the asynchronous operation notifies you that is has completed, usually via callback, or in this case the with QMessageService the stateChanged method will notify you with the 'finished' state

[ravi4frenz]

Thanks for the reply billbonney, I will try that and post the reply.

[ravi4frenz]

No, bill bonney, I have tried putting that message variable as a member of the MainWindow class but yet the problem is not resolved.

I have also tried debugging the program, when i saw the debugging output, after sending the first message and after responding to all the Message Boxes it shows "Running". What would be the real cause?. Will it be some problem with the QtMobility version?

I have tried that application installed in my device but no message is sent even for the first time. Does it requires any TARGET.CAPABILITY parameters? I have added the MOBILITY parameter networkservices and messaging.

[billbonney]

A quick look at the quick start guide and a search for capabilties http://doc.qt.nokia.com/qtmobility-1...uickstart.html shows Messaging needs LocalServices ReadUserData WriteUserData NetworkServices UserEnvironment ReadDeviceData WriteDeviceData.

Also this posting is quite helpful http://wiki.forum.nokia.com/index.ph...ng_Qt_Mobility

and this one http://wiki.forum.nokia.com/index.php/Capabilities

Hope that helps

[ravi4frenz]

Thank you for your hel;p. Yes, I have added those capabilities and still after trying to send the message for the second time, it puts the message in the sent folder directly. May be, this bug is going to be cleared in the future releases of Mobility API

[alisogor]

I'm new to this forum, but let me try to guess the problem:
-QMessageService::send is not sync call, i.e it might return false if something really problematic happened at early stage, like SMS destination number is not filled, but it does not signal about message sending. To be notified about send result, you have to connect to signal stateChanged(QMessageService::State).
Moreover, QMessageService documentation tells, that only one entity can be processed at the moment, if one SMS is being sending, "sender" is busy. So, you have to wait until appropriate state and buffer your SMSes or return. State is checked with state() member.

[ravi4frenz]

I have checked using the MessageStateChanged and it shows that message is sent. but it appears in the sent folder like what we see in inbox nem message. Might be some problem with mobility apis.