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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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  • EddyE Offline
    EddyE Offline
    Eddy
    wrote on last edited by Eddy
    #10

    Good to see it's funny to you ;-)

    Can you edit the link to you image or just copy the text here? We cannot see the image in your previous post.
    You can use an image provider to show it to us by following this topic
    There is still a problem with the uploading of image in the Qt forum. The admins are working on it though.

    Edit : did you check the hint from @koahnig ?

    Qt Certified Specialist
    www.edalsolutions.be

    AhtiA 1 Reply Last reply
    1
    • EddyE Eddy

      Good to see it's funny to you ;-)

      Can you edit the link to you image or just copy the text here? We cannot see the image in your previous post.
      You can use an image provider to show it to us by following this topic
      There is still a problem with the uploading of image in the Qt forum. The admins are working on it though.

      Edit : did you check the hint from @koahnig ?

      AhtiA Offline
      AhtiA Offline
      Ahti
      wrote on last edited by Ahti
      #11

      @Eddy see i edited the post

      changing from && to $$ ? yes i did that but now i am gettings those errors

      note the problem is with those Dll files i know it because when i delete them and run my project it works.

      what is a signature ?? Lol

      1 Reply Last reply
      0
      • EddyE Offline
        EddyE Offline
        Eddy
        wrote on last edited by
        #12

        why do you have those 2 lines?

        win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
        win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Library/ -ldxva2
        

        Is one of them not enough?
        The Dll path seems redundant since you don't use it further on

        Qt Certified Specialist
        www.edalsolutions.be

        AhtiA 1 Reply Last reply
        0
        • EddyE Eddy

          why do you have those 2 lines?

          win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
          win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Library/ -ldxva2
          

          Is one of them not enough?
          The Dll path seems redundant since you don't use it further on

          AhtiA Offline
          AhtiA Offline
          Ahti
          wrote on last edited by Ahti
          #13

          @Eddy

          Okay removed everything except :

          win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
          

          but still getting those 3 errors

          I use that Dll file for getting some windows functions that i need in my project.
          functions like :
          GetDesktopWindow();
          MonitorFromWIndow();
          GetCurrentBrightness();
          etc

          what is a signature ?? Lol

          K 1 Reply Last reply
          0
          • EddyE Offline
            EddyE Offline
            Eddy
            wrote on last edited by
            #14

            what is in your $$PWD/Dll/ folder?

            Qt Certified Specialist
            www.edalsolutions.be

            AhtiA 1 Reply Last reply
            1
            • AhtiA Ahti

              @Eddy

              Okay removed everything except :

              win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
              

              but still getting those 3 errors

              I use that Dll file for getting some windows functions that i need in my project.
              functions like :
              GetDesktopWindow();
              MonitorFromWIndow();
              GetCurrentBrightness();
              etc

              K Offline
              K Offline
              koahnig
              wrote on last edited by
              #15

              @Ahti said in how to fix " Missing argument to '-L' " error ?:

              @Eddy

              Okay removed everything except :

              win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
              

              but still getting those 3 errors

              I use that Dll file for getting some windows functions that i need in my project.
              functions like :
              GetDesktopWindow();
              MonitorFromWIndow();
              GetCurrentBrightness();
              etc

              The problem ist that this is only working for release. Therefore, you need to be sure that you are in release mode.
              Also sometimes it is good to rerun qmake and possibly rebuild your libraries.

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

              1 Reply Last reply
              1
              • EddyE Eddy

                what is in your $$PWD/Dll/ folder?

                AhtiA Offline
                AhtiA Offline
                Ahti
                wrote on last edited by
                #16

                @Eddy

                3 windows dll files

                dxva2.dll, dxva264.dll and user32.dll

                what is a signature ?? Lol

                K 1 Reply Last reply
                0
                • AhtiA Ahti

                  @Eddy

                  3 windows dll files

                  dxva2.dll, dxva264.dll and user32.dll

                  K Offline
                  K Offline
                  koahnig
                  wrote on last edited by
                  #17

                  @Ahti said in how to fix " Missing argument to '-L' " error ?:

                  @Eddy

                  3 windows dll files

                  dxva2.dll, dxva264.dll and user32.dll

                  no libs with those file names?
                  The dlls are used during run time, but while linking you need to have the libs created together with the dlls there.

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

                  AhtiA 1 Reply Last reply
                  0
                  • K koahnig

                    @Ahti said in how to fix " Missing argument to '-L' " error ?:

                    @Eddy

                    3 windows dll files

                    dxva2.dll, dxva264.dll and user32.dll

                    no libs with those file names?
                    The dlls are used during run time, but while linking you need to have the libs created together with the dlls there.

                    AhtiA Offline
                    AhtiA Offline
                    Ahti
                    wrote on last edited by
                    #18

                    @koahnig

                    now i got the libs but still getting that error :(

                    what is a signature ?? Lol

                    K 1 Reply Last reply
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                    • AhtiA Ahti

                      @koahnig

                      now i got the libs but still getting that error :(

                      K Offline
                      K Offline
                      koahnig
                      wrote on last edited by
                      #19

                      @Ahti said in how to fix " Missing argument to '-L' " error ?:

                      @koahnig

                      now i got the libs but still getting that error :(

                      What is the actual error message with your current configuration?
                      Probably it would be good also to post the current .pro file.

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

                      AhtiA 1 Reply Last reply
                      0
                      • K koahnig

                        @Ahti said in how to fix " Missing argument to '-L' " error ?:

                        @koahnig

                        now i got the libs but still getting that error :(

                        What is the actual error message with your current configuration?
                        Probably it would be good also to post the current .pro file.

                        AhtiA Offline
                        AhtiA Offline
                        Ahti
                        wrote on last edited by
                        #20

                        @koahnig

                        those three errors that i already mentioned.

                        my new pro file:

                        #-------------------------------------------------
                        #
                        # Project created by Ahtisham 2016-08-16T13:18:59
                        #
                        #-------------------------------------------------
                        
                        QT       += core gui
                        
                        greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                        
                        TARGET = testMyProject
                        TEMPLATE = app
                        
                        
                        SOURCES += main.cpp\
                                eyecare.cpp \
                            others.cpp
                        
                        HEADERS  += eyecare.h \
                            others.h
                        
                        FORMS    += eyecare.ui
                        
                        RESOURCES += \
                            images.qrc
                        
                        
                        win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
                        win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Library/ -ldxva2
                        else:win32:CONFIG(debug,debug|release): LIBS += -L$$PWD/Library/ -ldxva2
                        else:unix: LIBS += -L$$PWD/Library/ -ldxva2
                        
                        INCLUDEPATH += $$PWD/Library
                        DEPENDPATH += $$PWD/Library
                        
                        win32:CONFIG(release, debug|release): LIBS += -L$$PWD/Library/ -luser32
                        else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/Library/ -luser32
                        else:unix: LIBS += -L$$PWD/Library/ -luser32
                        
                        INCLUDEPATH += $$PWD/Library
                        DEPENDPATH += $$PWD/Library
                        
                        DISTFILES +=
                        
                        

                        what is a signature ?? Lol

                        K 1 Reply Last reply
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                        • AhtiA Ahti

                          @koahnig

                          those three errors that i already mentioned.

                          my new pro file:

                          #-------------------------------------------------
                          #
                          # Project created by Ahtisham 2016-08-16T13:18:59
                          #
                          #-------------------------------------------------
                          
                          QT       += core gui
                          
                          greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
                          
                          TARGET = testMyProject
                          TEMPLATE = app
                          
                          
                          SOURCES += main.cpp\
                                  eyecare.cpp \
                              others.cpp
                          
                          HEADERS  += eyecare.h \
                              others.h
                          
                          FORMS    += eyecare.ui
                          
                          RESOURCES += \
                              images.qrc
                          
                          
                          win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Dll/ -ldxva2
                          win32:CONFIG(release,debug|release): LIBS += -L$$PWD/Library/ -ldxva2
                          else:win32:CONFIG(debug,debug|release): LIBS += -L$$PWD/Library/ -ldxva2
                          else:unix: LIBS += -L$$PWD/Library/ -ldxva2
                          
                          INCLUDEPATH += $$PWD/Library
                          DEPENDPATH += $$PWD/Library
                          
                          win32:CONFIG(release, debug|release): LIBS += -L$$PWD/Library/ -luser32
                          else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/Library/ -luser32
                          else:unix: LIBS += -L$$PWD/Library/ -luser32
                          
                          INCLUDEPATH += $$PWD/Library
                          DEPENDPATH += $$PWD/Library
                          
                          DISTFILES +=
                          
                          
                          K Offline
                          K Offline
                          koahnig
                          wrote on last edited by
                          #21

                          @Ahti

                          Which means that the stubs in the lib-file are missing?
                          Do you have the import and export keyword handled correctly?

                          The dll and the stub-lib are generĂ¢ted with the same tool chain?

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

                          AhtiA 1 Reply Last reply
                          0
                          • K koahnig

                            @Ahti

                            Which means that the stubs in the lib-file are missing?
                            Do you have the import and export keyword handled correctly?

                            The dll and the stub-lib are generĂ¢ted with the same tool chain?

                            AhtiA Offline
                            AhtiA Offline
                            Ahti
                            wrote on last edited by Ahti
                            #22

                            @koahnig what do you mean by "stubs in the lib-file" what is that ? i don't know anything about that. I just copied all the required dll and lib files from the system32 to Dll and Library folders of my project respectively. And what is import and export keyword ?

                            I am creating this app just to let user change screen brightness and for that i need to use windows API and that is why i need those dll and lib files.

                            have a look:

                            https://msdn.microsoft.com/en-us/library/windows/desktop/dd692939(v=vs.85).aspx

                            goto the link and see at the end in "Requirements" heading it clearly mentions which library and dll files you need to include in order to use that specific windows api function.

                            what is a signature ?? Lol

                            K 1 Reply Last reply
                            0
                            • AhtiA Ahti

                              @koahnig what do you mean by "stubs in the lib-file" what is that ? i don't know anything about that. I just copied all the required dll and lib files from the system32 to Dll and Library folders of my project respectively. And what is import and export keyword ?

                              I am creating this app just to let user change screen brightness and for that i need to use windows API and that is why i need those dll and lib files.

                              have a look:

                              https://msdn.microsoft.com/en-us/library/windows/desktop/dd692939(v=vs.85).aspx

                              goto the link and see at the end in "Requirements" heading it clearly mentions which library and dll files you need to include in order to use that specific windows api function.

                              K Offline
                              K Offline
                              koahnig
                              wrote on last edited by
                              #23

                              @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?

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

                              AhtiA 1 Reply Last reply
                              0
                              • 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
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                                    • 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
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