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    Solved how to add library(qmqtt.h) in qmqtt client for windows

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    • raven-worx
      raven-worx Moderators @shravani last edited by

      @shravani
      You need to be more specific to be able to help, since this can have many causes.
      Maybe you just need to rerun qmake to update the makefiles?
      Show the directory structure and your .pro file.

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      1 Reply Last reply Reply Quote 2
      • S
        shravani last edited by shravani

        hi,
        this is my .pro file
        and my code is inthis( https://github.com/wuming123057/qmqtt-client) link.
        the library i added is https://github.com/emqtt/qmqtt

        QT += core gui network

        greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

        CONFIG += c++11
        CONFIG+= NO_UNIT_TESTS
        TARGET = qmqtt-client
        TEMPLATE = app

        #NOTICE: add DYLD_LIBRARY_PATH to build environment.
        INCLUDEPATH += C:\Qt\qmqtt-master\src
        LIBS += -LC:\Qt\qmqtt-master\src -lqmqtt

        SOURCES += main.cpp
        mainwindow.cpp
        connform.cpp
        pubform.cpp
        subform.cpp

        HEADERS += mainwindow.h
        connform.h
        pubform.h
        subform.h
        mqttform.h

        FORMS += mainwindow.ui
        connform.ui
        pubform.ui
        subform.ui

        im getting error:
        cannot find -lmqtt
        returned 1 exit status

        raven-worx 1 Reply Last reply Reply Quote 0
        • F
          Fuel last edited by

          which name has the library in this path C:\Qt\qmqtt-master\src ?

          1 Reply Last reply Reply Quote 0
          • raven-worx
            raven-worx Moderators @shravani last edited by raven-worx

            @shravani said in how to add library(qmqtt.h) in qmqtt client for windows:

            INCLUDEPATH += C:\Qt\qmqtt-master\src

            should point to the sources of qmqtt (specifically where qmqtt.h is placed in)

            LIBS += -LC:\Qt\qmqtt-master\src -lqmqtt

            Also you need to build qmqtt beforehand. -L should point to the path of the library (.lib) you built

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            S 1 Reply Last reply Reply Quote 2
            • S
              shravani last edited by shravani

              thank you,
              i will try building the qmqtt.

              1 Reply Last reply Reply Quote 1
              • S
                shravani @raven-worx last edited by

                @raven-worx
                hi,
                i tried building the library(i got "could not find executable please specify one" dialog box) there is no .dll or .lib or .so file in build folder.
                in build it created 3 folders(.moc,.obj,.pch).could you please tell me how to generate .lib file

                jsulm 1 Reply Last reply Reply Quote 0
                • jsulm
                  jsulm Lifetime Qt Champion @shravani last edited by

                  @shravani Can you explain what exactly you did?

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  S 1 Reply Last reply Reply Quote 0
                  • S
                    shravani @jsulm last edited by shravani

                    @jsulm

                    from here https://github.com/emqtt/qmqtt i downloaded zip file.in that src/mqtt mqtt.pro i built using qt.but that library not generating any .lib files.
                    (as u told i need to build qmqtt beforehand. -L should point to the path of the library (.lib) you built.)

                    jsulm 1 Reply Last reply Reply Quote 0
                    • jsulm
                      jsulm Lifetime Qt Champion @shravani last edited by

                      @shravani What I wanted to know was: how exactly did you build? What steps did you execute?
                      "built using qt" - what does this mean? Qt does not build anything. Do you mean you used QtCreator or qmake?
                      Can you also post the build log?

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                      S 1 Reply Last reply Reply Quote 0
                      • S
                        shravani @jsulm last edited by shravani

                        @jsulm
                        i used qt creator.i just opened .pro file (src/mqtt/mqtt.pro from above link)using qtcreator and build all.

                        jsulm 1 Reply Last reply Reply Quote 0
                        • jsulm
                          jsulm Lifetime Qt Champion @shravani last edited by

                          @shravani Can you post the build log?

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                          S 1 Reply Last reply Reply Quote 0
                          • S
                            shravani @jsulm last edited by shravani

                            @jsulm
                            when i click on build all one dialog box came like below.but in build folder(build-abc-Desktop_Qt_5_8_1_MinGW_32bit-Debug) .lib file not generated only 3 folders(.moc, .obj , .pch) created .!!0_1498626615873_Capture.PNG

                            jsulm 1 Reply Last reply Reply Quote 0
                            • jsulm
                              jsulm Lifetime Qt Champion @shravani last edited by

                              @shravani It looks like you're clicking on Run not on Build. Since mqtt is a lib you cannot execute it. And again: can you post the build log?

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

                              S 1 Reply Last reply Reply Quote 1
                              • S
                                shravani @jsulm last edited by shravani

                                @jsulm
                                sorry ,i can only post what i got after building in build folder.0_1498628025184_build_image.PNG!0_1498628076971_build.PNG

                                jsulm raven-worx 2 Replies Last reply Reply Quote 0
                                • jsulm
                                  jsulm Lifetime Qt Champion @shravani last edited by

                                  @shravani Why can't you post the build log? You have it in QtCreator. The screen-shots you posted do not help.

                                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                                  1 Reply Last reply Reply Quote 0
                                  • raven-worx
                                    raven-worx Moderators @shravani last edited by

                                    @shravani
                                    got the folder where you donwloaded qmqtt (where the qmqtt.pro resides) and and execute the following:

                                    1. qmake
                                    2. nmake (for Visual Studio compiler) or mingw32-make (for mingw)

                                    thats it. No QtCreator needed.
                                    Then the .dll and corresponding .lib (MSVC) or .a (mingw32) file will be created in the output folder.

                                    --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                    If you have a question please use the forum so others can benefit from the solution in the future

                                    S 1 Reply Last reply Reply Quote 1
                                    • S
                                      shravani @raven-worx last edited by shravani

                                      @raven-worx
                                      thank you,
                                      im new to qt could you please tell me how to execute qmake and mingw32-make in windows?

                                      raven-worx 1 Reply Last reply Reply Quote 0
                                      • raven-worx
                                        raven-worx Moderators @shravani last edited by raven-worx

                                        @shravani
                                        open a console window and execute "qmake" let it finished and afterwards execute one of the two (the correct one corresponding to your used compiler!) make commands for building.

                                        Make sure that the executable can be found by the system (add the paths to the PATH environment variable)
                                        But those a pretty basics. Probably you should go on reading some learning material first before trying to build a software which is based on a 3rd party library.

                                        --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                        If you have a question please use the forum so others can benefit from the solution in the future

                                        S 1 Reply Last reply Reply Quote 1
                                        • S
                                          shravani @raven-worx last edited by shravani

                                          @raven-worx
                                          can u give any link to read? and where .lib will be created? in same folder?

                                          raven-worx 1 Reply Last reply Reply Quote 0
                                          • raven-worx
                                            raven-worx Moderators @shravani last edited by

                                            @shravani
                                            Getting started.
                                            Probably you should consider buying a book about Qt also

                                            --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                            If you have a question please use the forum so others can benefit from the solution in the future

                                            S 1 Reply Last reply Reply Quote 1
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