QT posix message queue

[mrjj]

@jish
Its a linux header. Not related to Qt at all. This is where it is on my system

[jsulm]

@jish Do you use a Linux distribution?
If so then install needed package. On Ubuntu you need to install libc6-dev package.

[jish]

@jsulm i'm using linux distribution.
i am able to use mqueue.h in my linux program without any error. Only using with qt showed the error message.

[jsulm]

@jish It would be helpful to know which one.
What does

find /usr -name mqueue.h

output?

[jish]

@jsulm said in QT posix message queue:

find /usr -name mqueue.h

output
/usr/include/mqueue.h
/usr/include/x86_64-linux-gnu/bits/mqueue.h
/usr/include/linux/mqueue.h
/usr/src/linux-headers-3.13.0-24-generic/include/config/posix/mqueue.h
/usr/src/linux-headers-3.13.0-117/include/uapi/linux/mqueue.h
/usr/src/linux-headers-3.13.0-117-generic/include/config/posix/mqueue.h
/usr/src/linux-headers-3.13.0-24/include/uapi/linux/mqueue.h

[jsulm]

@jish What is the error message after changing

#include <Mqueue.h>

to

#include <mqueue.h>

?

[jsulm]

@jish Can you upload your project to somewhere? I then can try to build it on my machine.

[jish]

@jsulm same..no such file or directory.
And i can't upload the the project since i'm working with a company.
Can you please try open a message queue using mq_open in qt creator?

[jsulm]

@jish This builds on my machine in QtCreator:

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

#include <QDebug>

#include <mqueue.h>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    mqd_t mqid;
    mqid=mq_open("/hmi_chnl_ic",O_RDONLY);
    if(mqid==-1)
    {
        qDebug()<<"error opening message queue";
    }
}

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

pro file:

#-------------------------------------------------
#
# Project created by QtCreator 2017-05-19T09:26:01
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test_mqueue
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

LIBS += -lrt

SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

You need to add -lrt to be able to link.

[jish]

@jsulm omg that solved my issue. Thank you very much.
one question where you saved mqueue.h in your system?