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  4. how to fix " Missing argument to '-L' " error ?
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how to fix " Missing argument to '-L' " error ?

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  • K koahnig

    @Ahti

    When creating a dll you will also create a library (it may have .lib as extension or .a depending on compiler). You need to link the library to your application which is using your dll. The library contains basically a reduced, short part (stub as the rest of tree when you have cut it down) .

    dllimport and dllexport it is called for MS compilers. An inpedendent way is with Q_DECL_IMPORT and Q_DECL_EXPORT

    What compiler are you using for creating your application?

    AhtiA Offline
    AhtiA Offline
    Ahti
    wrote on last edited by
    #24

    @koahnig

    there you go:

    https://ibb.co/bDcoXk

    what is a signature ?? Lol

    K 1 Reply Last reply
    0
    • AhtiA Ahti

      @koahnig

      there you go:

      https://ibb.co/bDcoXk

      K Offline
      K Offline
      koahnig
      wrote on last edited by
      #25

      @Ahti

      From where did you get the include file HighLevelMonitorConfigurationAPI.h ?

      Vote the answer(s) that helped you to solve your issue(s)

      AhtiA 1 Reply Last reply
      0
      • K koahnig

        @Ahti

        From where did you get the include file HighLevelMonitorConfigurationAPI.h ?

        AhtiA Offline
        AhtiA Offline
        Ahti
        wrote on last edited by Ahti
        #26

        @koahnig I didn't get it from anywhere i just included it and qt responded on its own by mentioning it in the suggestion list. write this in your qt creator and it will give you a header file with this suggestion:

        #include <highlevelmonitorconfigurationapi.h>
        

        what is a signature ?? Lol

        K 1 Reply Last reply
        0
        • AhtiA Ahti

          @koahnig I didn't get it from anywhere i just included it and qt responded on its own by mentioning it in the suggestion list. write this in your qt creator and it will give you a header file with this suggestion:

          #include <highlevelmonitorconfigurationapi.h>
          
          K Offline
          K Offline
          koahnig
          wrote on last edited by
          #27

          @Ahti

          I got it. Never used it.

          You are using a MinGW-C++ Gnu-compiler together with a MS library and dll.
          I think in general this should be possible as long as the keywords are set properly which I would assume for this header file which is apparently part of MinGW.

          Once again, please post the error output as to be found in your output pane. They may hold a clue of the problem.

          BTW MS compilers are typically not compatible between its different version and certainly not with MinGW in general.

          Vote the answer(s) that helped you to solve your issue(s)

          AhtiA 1 Reply Last reply
          2
          • K koahnig

            @Ahti

            I got it. Never used it.

            You are using a MinGW-C++ Gnu-compiler together with a MS library and dll.
            I think in general this should be possible as long as the keywords are set properly which I would assume for this header file which is apparently part of MinGW.

            Once again, please post the error output as to be found in your output pane. They may hold a clue of the problem.

            BTW MS compilers are typically not compatible between its different version and certainly not with MinGW in general.

            AhtiA Offline
            AhtiA Offline
            Ahti
            wrote on last edited by Ahti
            #28

            @koahnig

            Here is the error output:
            0_1498227345255_eyecare.h - testMyProject - Qt Creator 23-06-2017 19_44_39.png

            what is a signature ?? Lol

            K 1 Reply Last reply
            0
            • AhtiA Ahti

              @koahnig

              Here is the error output:
              0_1498227345255_eyecare.h - testMyProject - Qt Creator 23-06-2017 19_44_39.png

              K Offline
              K Offline
              koahnig
              wrote on last edited by
              #29

              @Ahti

              Need to copy and paste the content of the "Compile Output" pane. This is only a comprehesive summary telling almost nothing.

              In the Compile Output pane you have the complete messages from the compile and linker. Typically you have black and blue fonts. When you have errors it starts at certain point to output with red font. There is typically the interesting part.

              Not sure if I can see anything, but it is the next best option.

              Mark the text where the problem starts plus a couple of lines before and after and with copy and paste post it here as source code. This shold be enough.

              Vote the answer(s) that helped you to solve your issue(s)

              AhtiA 1 Reply Last reply
              0
              • K koahnig

                @Ahti

                Need to copy and paste the content of the "Compile Output" pane. This is only a comprehesive summary telling almost nothing.

                In the Compile Output pane you have the complete messages from the compile and linker. Typically you have black and blue fonts. When you have errors it starts at certain point to output with red font. There is typically the interesting part.

                Not sure if I can see anything, but it is the next best option.

                Mark the text where the problem starts plus a couple of lines before and after and with copy and paste post it here as source code. This shold be enough.

                AhtiA Offline
                AhtiA Offline
                Ahti
                wrote on last edited by
                #30

                @koahnig

                Compile Output:

                0_1498238168735_library error.JPG

                what is a signature ?? Lol

                K 1 Reply Last reply
                0
                • AhtiA Ahti

                  @koahnig

                  Compile Output:

                  0_1498238168735_library error.JPG

                  K Offline
                  K Offline
                  koahnig
                  wrote on last edited by
                  #31

                  @Ahti

                  Sorry, this goes beyond my experience.
                  This is poking about in the fog. Possibly the wrong version of library, but I do not know.

                  You probably need to checkout the information around for MinGW.

                  Vote the answer(s) that helped you to solve your issue(s)

                  AhtiA 2 Replies Last reply
                  1
                  • K koahnig

                    @Ahti

                    Sorry, this goes beyond my experience.
                    This is poking about in the fog. Possibly the wrong version of library, but I do not know.

                    You probably need to checkout the information around for MinGW.

                    AhtiA Offline
                    AhtiA Offline
                    Ahti
                    wrote on last edited by Ahti
                    #32

                    @koahnig

                    I have an old copy of my project in my desktop and that old copy works perfectly fine. so what i did is that i just took that old copy and replaced the codes in it with the new code of my new project and ran that old project and this is what i came up with :

                    0_1498892783250_win api error.JPG

                    I know its the same error which i encountered in my new copy of the project but whenever i got that error i was not able to locate it but with what i just did i was able to locate the source of the problem. so after including all the header files ( which i have missed ) i am still getting the problem. I included the dll as well as lib files as well but getting same error.

                    GetDesktopWIndow function requirements:

                    0_1498894960070_win api function des.JPG

                    what is a signature ?? Lol

                    1 Reply Last reply
                    0
                    • K koahnig

                      @Ahti

                      Sorry, this goes beyond my experience.
                      This is poking about in the fog. Possibly the wrong version of library, but I do not know.

                      You probably need to checkout the information around for MinGW.

                      AhtiA Offline
                      AhtiA Offline
                      Ahti
                      wrote on last edited by
                      #33

                      @koahnig

                      Look again at the compile output :

                      0_1498934912587_main.cpp - test - Qt Creator 02-07-2017 00_16_33.png

                      what is a signature ?? Lol

                      1 Reply Last reply
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