Qt4 Bluetooth Rfcomm problem I

cmosneang

Hello,

I am new to Qt, and I want to make an app on an embedded linux device in Qt4 that send and receives some data throw bluetooth from another device using SPP and RFOMM. I want to use theBT functions from #include<bluetooth/bluetooth.h> and #include<bluetooth/rfcomm.h> which are written in C, but I cannot compile them in Qt Creator.

So my question is how do I compile these 2 includes in Qt or is there another way to use rfcomm and bluetooth?Thank you very much.

SGaist

Hi and welcome to devnet,

Since you are using linux, did you took a look at the Qt's bluetooth module ?

cmosneang

Hello,

I am new to Qt and from what I have read for Qt 4 I would have to use Qt mobility 1.2 which contains the bluetooth module but I cannot find a valid link to download http://doc-snapshot.qt-project.org/qt-mobility/qtmobility-release-notes.html . I am using Qt 4.8.4 and QtCreator 2.7.1. Thank you

SGaist

You can clone it "here":https://qt.gitorious.org/qt-mobility

cmosneang

Hello,

Thanks for the link, I have made a clone, installed it using the steps from http://doc.qt.digia.com/qtmobility/installation.html but QtCreator doesn't recognize it.
I had installed the Qt Mobility into the QtCreator folder, I see now there is a folder /lib and /include which contains all sort of librarys and headers for Qt Mobility.
What could be the problem? Thank you

Here is my .pro file content:

@#-------------------------------------------------

Project created by QtCreator 2014-04-27T09:10:17

#-------------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = NewBlue
TEMPLATE = app

SOURCES += main.cpp
dialog.cpp

HEADERS += dialog.h

FORMS += dialog.ui
target.path+=/home/root
INSTALLS+=target

CONFIG += mobility
MOBILITY = connectivity@

And the main.cpp where I have just inserted #include<qbluetoothserviceinfo.h> and #include <qbluetoothsocket.h> from the bttennis example :

@#include "dialog.h"
#include <QApplication>
#include <qbluetoothserviceinfo.h>
#include <qbluetoothsocket.h>

QTM_USE_NAMESPACE

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
w.show();

return a.exec&#40;&#41;;

}@

I get the following error:

../NewBlue/main.cpp:3:35: fatal error: qbluetoothserviceinfo.h: No such file or directory
compilation terminated.
make: *** [main.o] Error 1
10:04:41: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project NewBlue (kit: Sitara AM335x)
When executing step 'Make'
10:04:41: Elapsed time: 00:00.

And here is my .profile file where in the installation I have added the LD_LIBRARY_PATH using gedit from Linux.

~/.profile: executed by the command interpreter for login shells.

This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login

exists.

see /usr/share/doc/bash/examples/startup-files for examples.

the files are located in the bash-doc package.

the default umask is set in /etc/profile; for setting the umask

for ssh logins, install and configure the libpam-umask package.

#umask 022

if running bash

if [ -n "$BASH_VERSION" ]; then
# include .bashrc if it exists
if [ -f "$HOME/.bashrc" ]; then
. "$HOME/.bashrc"
fi
fi

set PATH so it includes user's private bin if it exists

if [ -d "$HOME/bin" ] ; then
PATH="$HOME/bin:$PATH"
fi

QMAKESPEC=/home/claudiu/ti-sdk-am335x-evm-06.00.00.00/linux-devkit/arm-arago-linux-gnueabi/usr/share/qtopia/mkspecs/linux-g++;export QMAKESPEC; # ADDED BY INSTALLER - DO NOT EDIT OR DELETE THIS COMMENT - AB1C36D0-2B62-930A-B1CF-1B15CF69BE47 90FD792D-9FFB-93E9-DFD8-E1F4A2589281

LD_LIBRARY_PATH=/home/claudiu/qtcreator-2.7.1/lib:$LD_LIBRARY_PATH;export LD_LIBRARY_PATH;

SGaist

For the include part your should use

@#include <QBluetoothServiceInfo>@

Did you correctly called "make install" after you have built Qt Mobility ?

cmosneang

Hello,

This are the exact steps I made:
source /home/claudiu/ti-sdk-am335x-evm-06.00.00.00/linux-devkit/environment-setup
cd /home/claudiu/qt-mobility-cmosneangs-qt-mobility2
./configure -prefix /home/claudiu/qtcreator-2.7.1
make
make install
cd /home/claudiu
gedit .profile

I changed dir to the folder where I have uncompressed the qt-mobility and then I run configure to the folder where the qtcreator is located and make and make install.

SGaist

Are you cross-compiling it ?

You should not install Qt Mobility in Qt Creator, it's not its place

cmosneang

Hello,

Yes I am writing the application for an ARM Linux Device named Sitara AM335x, I am new to Qt and Linux so where should I install Qt Mobility?

SGaist

Besides your cross-compiled Qt directory. If you have e.g. /usr/local/Trolltech/Qt-Embedded-4.8.6 then install Mobility in /usr/locat/Trolltech/Qt-Mobility-Embedded-4.8.6

If you are developing/testing on your computer before building for your ARM board, then you must also compile Qt Mobility for your desktop Qt

cmosneang

Hello,

So if I use /home/claudiu/ti-sdk-am335x-evm-06.00.00.00/linux-devkit/ where I have the compilers for my ARM board I should install Qt-mobility there and put the LD_LIBRARY_PATH to point to that folder? Even if QtCreator folder is on /home/claudiu/qtcreator-2.7.1?
I am not testing on my computer, I am deploying on the board from Qt Creator.
Thank you.

SGaist

Qt Creator is an IDE, it doesn't contain any Qt version to use for developing.

Like I said the best if to install it in the same folder where you have your Qt ARM version

Kamal Badi

hello there,
i have the same problem with ti-sdk-am335x-evm-06.00.00.00, does it support qt mobility "Location & position"?? because it didn't work with me !! , the new ti-sdk-am335x-evm-08.00.00.00 is support until QT 5.5 but i need to know how to setup this lib with the ti-sdk-am335x-evm-0x.00.00.00 to enable qt creator to deploy my apps in the EVM, what should i do ??
thanks in advance ...

SGaist

Qt Mobility is needed for Qt 4. Qt 5.5 has both Qt Location and Qt Positioning modules

Kamal Badi

hi @SGaist
thanks for replying, that mean if i need to use Qt location i must use qt5 rit ?
okay sorry but i need to ask this , did the QgeoMap support for offline map work or it just work online with the given servers providers !?

SGaist

Qt Location is indeed a Qt 5 module.

AFAIK, Qt 5 has currently no offline plugin.