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QTAndroid protobuf with QT creator

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #10

    protoc just generate files in the programming language you choose. There's nothing special here, as I already suggested, install the protoc compiler from your distribution and generate the file with it.

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    • A Offline
      A Offline
      AMOL
      wrote on last edited by AMOL
      #11

      Ok but issue then issue is after creating my pb.cc and pb.h file and added to qt creator is gives error as undefined reference to Google protobuf
      Then can anyone provide steps for adding protobuf .so files and pb.cc pb.h files to qt creator and then run on Android

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #12

        Did you add the

        LIBS += 
        

        statement in your .pro file to link to the library ?

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        • A Offline
          A Offline
          AMOL
          wrote on last edited by
          #13

          @sgaist said in QTAndroid protobuf with QT creator:

          LIBS +=

          My proto file look like this:

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

          Project created by QtCreator 2016-03-22T07:38:29

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

          QT += core gui bluetooth
          CONFIG += c++11

          greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

          TARGET = BLETester
          TEMPLATE = app

          SOURCES += main.cpp
          acp.pb.cc
          dfuservice.cpp
          mainwindow.cpp
          bleinterface.cpp
          utils.cpp

          HEADERS += mainwindow.h
          acp.pb.h
          bleinterface.h
          dfuservice.h
          lib-qt-qml-tricks/src/qqmlhelpers.h
          lib-qt-qml-tricks/src/qqmlhelpers.h
          utils.h

          FORMS += mainwindow.ui

          win32:INCLUDEPATH += "$$PWD\google"

          RESOURCES +=
          resources.qrc

          android{
          INCLUDEPATH += F:\QT_android\compile\protobuf-3.9.1\src
          LIBS += -L"F:\QT_android\compile\protobuf-3.9.1\src\protobuff_android"
          -lprotobuf
          -lprotobuf-lite
          -lprotoc
          }

          Turn off ALL warning for the project

          win32:CONFIG += warn_off

          contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
          ANDROID_EXTRA_LIBS =
          $$PWD/../protobuf_android/libprotobuf.so
          $$PWD/../protobuf_android/libprotobuf-lite.so
          $$PWD/../protobuf_android/libprotoc.so
          }

          DISTFILES +=
          acp.proto

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #14

            Are you sure you have built protobuf for the correct architecture ? 32 vs 64 bit for example ?

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            • A Offline
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              AMOL
              wrote on last edited by
              #15

              @sgaist said in QTAndroid protobuf with QT creator:

              distribution

              @sgaist said in QTAndroid protobuf with QT creator:

              protoc just generate files in the programming language you choose. There's nothing special here, as I already suggested, install the protoc compiler from your distribution and generate the file with it.

              yes
              as you said, i have installed protobuf compiler on Linux 64 bit and from that only I am generating pb.cc and pb.h files

              Is that correct?

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              • A Offline
                A Offline
                AMOL
                wrote on last edited by
                #16

                @SGaist any comment on this???

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                • A Offline
                  A Offline
                  AMOL
                  wrote on last edited by AMOL
                  #17

                  After compiling from protobuf-cpp-3.9.1 and adding pb.cc and pb.h to project I get this error
                  0_1567683866738_a8f75ad0-3bfc-4f60-bcb5-f433b61fe52f-image.png

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #18

                    Start by just building the protobuf related files so you ensure that you have that stuff working correctly. I would even start first by building for your desktop OS. That way you ensure that this part is working correctly before going forward with Android.

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                    • A Offline
                      A Offline
                      AMOL
                      wrote on last edited by
                      #19

                      Yes, This application is hybrid application (ios,android and windows)
                      for windows desktop application protobuf is working correctly without error,
                      but when I change my kit to android then it gives above error

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                      • A AMOL

                        I used protobuf but it is for Windows or Linux not for Android I want to cross compile it with Android then I can us it

                        Pablo J. RoginaP Offline
                        Pablo J. RoginaP Offline
                        Pablo J. Rogina
                        wrote on last edited by
                        #20

                        @amol said in QTAndroid protobuf with QT creator:

                        I used protobuf but it is for Windows or Linux

                        Ok, so you're somehow experienced with that technology.

                        For me that I'm not, could you please explain how to use protobuf in a general way, and I guess that in the process you might figure out what you're doing differently or not yet doing for Android?

                        In addition, when working with a 3rd party library or files that you want to use in a Qt application for Android the basic requirement is that the library is compiled for any of the Android platforms (usually arm6, arm7 and lately arm8) and that process is usually carried on separately from Qt Creator via the NDK (talking about a C++ library or files). Once you have the (shared) objects created with the NDK you place them in a proper location within the Qt project folder structure and then Qt Creator is finally able to create the Android app and deploy to the device configured in your kit.

                        So talking about protobuf it couldn't be that different. You need to create with NDK whatever components are required (either a .so or files .cc and .h) and then add such files to your Qt project

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