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Changing qmake/.pro file with cpp files

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  • G GCDX

    So basically, i want to use override the DEFINE statement in the qmake file by running a script?? Could you give me a structure on how to run the script? Cause i do not know the syntax :(

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by mrjj
    #5

    @GCDX
    Hi
    example.

    win32 {
        BUILD_TIME = $$system("time /T") # no spaces between 'system' command and args.
    } else {
        BUILD_TIME = $$system("date")
    }
    message($$BUILD_TIME) # output the current time
    DEFINES+=BUILD_TIME # make it into a define to be used in app.
    
    

    Time would be a script to get key.

    1 Reply Last reply
    3
    • G Offline
      G Offline
      GCDX
      wrote on last edited by
      #6

      @mrjj Thanks so much for clarifying the syntax with me!
      However, do you have a link to help me understand what is happening here?
      i assume win32 is when its a windows computer, but what does this mean $$system("time /T")? is it time.cpp that is the script that has to be created in the sources directory? And if it's time.cpp, do i use:
      #include <iostream>
      using namespace std;
      int main(){
      BUILD_TIME=101010;
      return 0;
      }
      Because i tried this and i couldn't do it! Thanks so much for your time.

      aha_1980A mrjjM 2 Replies Last reply
      0
      • G GCDX

        @mrjj Thanks so much for clarifying the syntax with me!
        However, do you have a link to help me understand what is happening here?
        i assume win32 is when its a windows computer, but what does this mean $$system("time /T")? is it time.cpp that is the script that has to be created in the sources directory? And if it's time.cpp, do i use:
        #include <iostream>
        using namespace std;
        int main(){
        BUILD_TIME=101010;
        return 0;
        }
        Because i tried this and i couldn't do it! Thanks so much for your time.

        aha_1980A Offline
        aha_1980A Offline
        aha_1980
        Lifetime Qt Champion
        wrote on last edited by
        #7

        @GCDX said in Changing qmake/.pro file with cpp files:

        $$system

        http://doc.qt.io/archives/qt-4.8/qmake-function-reference.html#system-command

        Qt has to stay free or it will die.

        1 Reply Last reply
        1
        • G GCDX

          @mrjj Thanks so much for clarifying the syntax with me!
          However, do you have a link to help me understand what is happening here?
          i assume win32 is when its a windows computer, but what does this mean $$system("time /T")? is it time.cpp that is the script that has to be created in the sources directory? And if it's time.cpp, do i use:
          #include <iostream>
          using namespace std;
          int main(){
          BUILD_TIME=101010;
          return 0;
          }
          Because i tried this and i couldn't do it! Thanks so much for your time.

          mrjjM Offline
          mrjjM Offline
          mrjj
          Lifetime Qt Champion
          wrote on last edited by
          #8

          @GCDX
          Hi
          the time /T just returns a time string. ( try in a cmd prompt)
          it then sets this result to the variable BUILD_TIME
          its then added
          DEFINES+=
          to the defines compiled into the program.
          You can then read from app.
          You can not actually set it from the app.
          I imagine "time" would be your getkey.bat that would return a key
          and have the compiled into app. Maybe i misread what goal is.

          G 1 Reply Last reply
          1
          • mrjjM mrjj

            @GCDX
            Hi
            the time /T just returns a time string. ( try in a cmd prompt)
            it then sets this result to the variable BUILD_TIME
            its then added
            DEFINES+=
            to the defines compiled into the program.
            You can then read from app.
            You can not actually set it from the app.
            I imagine "time" would be your getkey.bat that would return a key
            and have the compiled into app. Maybe i misread what goal is.

            G Offline
            G Offline
            GCDX
            wrote on last edited by
            #9

            @mrjj
            win32 {
            BUILD_TIME = $$system("time.cpp /T") to run a time.cpp file in the source directory
            } else {
            BUILD_TIME = $$system("date")
            }
            message($$BUILD_TIME) # output the current time
            DEFINES+=BUILD_TIME # make it into a define to be used in app.

            I want the time.cpp file to update the define of the BUILD_TIME, so maybe in time.cpp it has a BUILD_TIME=100; however, it is still throwing me an error that lvalue required for left assignment of operand.

            1 Reply Last reply
            0
            • G Offline
              G Offline
              GCDX
              wrote on last edited by
              #10

              @mrjj Right now it runs the time.cpp. However, it does not allow BUILD_TIME to assign a new value

              mrjjM 1 Reply Last reply
              0
              • G GCDX

                @mrjj Right now it runs the time.cpp. However, it does not allow BUILD_TIME to assign a new value

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #11

                @GCDX

                Not from inside the app. its a define.
                From the project that needs to key key to its .pro file
                you call some getkey.bat that returns the key.
                that key is compiled into the app via the define from its .pro file.
                If you need some other way of working, you need to adjust who set is and who reads it.

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  Hi,

                  Why hardcode the key ? You could make a settings of it for your application.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  G 1 Reply Last reply
                  1
                  • SGaistS SGaist

                    Hi,

                    Why hardcode the key ? You could make a settings of it for your application.

                    G Offline
                    G Offline
                    GCDX
                    wrote on last edited by
                    #13

                    @SGaist Could you elaborate on this? And if possible show me documentation as well? Because i tried to declare it as a public variable but it couldn't be accessed outside of the class. I was wondering if there is a better way?

                    1 Reply Last reply
                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #14

                      QSettings comes to mind for example.

                      Where do you need to use that key in your code ?

                      If you have a class dedicated to the use of the API, then there's no need for a "public accessible from everywhere variable". Make the API key a property of that class and have a preference widget connected to the instance of that class what will update the API key. Then show that preference widget were appropriate to edit the key.

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                      1 Reply Last reply
                      0

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