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How to connect IP camera to QT ?

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  • V Vijaykarthikeyan

    @beautifulcloud Thank you Sir..I understand the flow of the code you have provided for. I need to access the ip camera using ip address and password. My Qt is failed to link with the 3rd party library

    JonBJ Online
    JonBJ Online
    JonB
    wrote on last edited by
    #7

    @Vijaykarthikeyan said in How to connect IP camera to QT ?:

    My Qt is failed to link with the 3rd party library

    If you mean you get a linker error, show the command line and the error message.

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    • JonBJ JonB

      @Vijaykarthikeyan said in How to connect IP camera to QT ?:

      My Qt is failed to link with the 3rd party library

      If you mean you get a linker error, show the command line and the error message.

      V Offline
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      Vijaykarthikeyan
      wrote on last edited by
      #8

      @JonB Screenshot 2023-06-20 105831.png Screenshot 2023-06-19 184808.png

      JonBJ 1 Reply Last reply
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      • V Vijaykarthikeyan

        @JonB Screenshot 2023-06-20 105831.png Screenshot 2023-06-19 184808.png

        JonBJ Online
        JonBJ Online
        JonB
        wrote on last edited by
        #9

        @Vijaykarthikeyan
        Why are you continuing the same discussion about your linking in thread https://forum.qt.io/topic/145898/opencv-ip-camera-connection ? This is precisely why it's not helpful to be maintaining separate threads about essentially the same question, that wastes people's time answering in two places.

        I posted a question to you there.

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        • JonBJ JonB

          @Vijaykarthikeyan
          Why are you continuing the same discussion about your linking in thread https://forum.qt.io/topic/145898/opencv-ip-camera-connection ? This is precisely why it's not helpful to be maintaining separate threads about essentially the same question, that wastes people's time answering in two places.

          I posted a question to you there.

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          Vijaykarthikeyan
          wrote on last edited by
          #10

          @JonB Sorry Sir..you have tag me also...I too didnt noticed your reply

          JonBJ 1 Reply Last reply
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          • V Vijaykarthikeyan

            @JonB Sorry Sir..you have tag me also...I too didnt noticed your reply

            JonBJ Online
            JonBJ Online
            JonB
            wrote on last edited by
            #11

            @Vijaykarthikeyan
            I think these two questions are the same? You need to sort out the linking in both cases before proceeding.

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            • JonBJ JonB

              @Vijaykarthikeyan
              I think these two questions are the same? You need to sort out the linking in both cases before proceeding.

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              Vijaykarthikeyan
              wrote on last edited by
              #12

              @JonB Oh..thank you..I've changed my compiler settings to 64-bit version..But still the error persists

              SGaistS 1 Reply Last reply
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              • V Vijaykarthikeyan

                @JonB Oh..thank you..I've changed my compiler settings to 64-bit version..But still the error persists

                SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #13

                @Vijaykarthikeyan Verify that everything is using the same architecture and that you are also linking to all the required libraries.

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

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                • SGaistS SGaist

                  @Vijaykarthikeyan Verify that everything is using the same architecture and that you are also linking to all the required libraries.

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                  Vijaykarthikeyan
                  wrote on last edited by
                  #14

                  @SGaist My compiler is MING 8.1.0 64 bit compiler..

                  Upon reading, I found that OpenCV 4.X versions are compatible with Qt 5 and 6

                  I've downloaded OpenCV 4.7 version..There is only one library called open_cvworld470

                  Upon searching,I came to know that the error undefined error results from Linking error..But,Ive followed the correct way to link theat library in .pro file.

                  JonBJ 1 Reply Last reply
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                  • V Vijaykarthikeyan

                    @SGaist My compiler is MING 8.1.0 64 bit compiler..

                    Upon reading, I found that OpenCV 4.X versions are compatible with Qt 5 and 6

                    I've downloaded OpenCV 4.7 version..There is only one library called open_cvworld470

                    Upon searching,I came to know that the error undefined error results from Linking error..But,Ive followed the correct way to link theat library in .pro file.

                    JonBJ Online
                    JonBJ Online
                    JonB
                    wrote on last edited by JonB
                    #15

                    @Vijaykarthikeyan
                    What actual library file do you have: opencv_world470.lib or libopencv_world.a? If it is the former then it looks to me like your OpenCV is compiled with MCVC (and the path including vc16 seems to confirm that). You cannot then compile your own or Qt code with MinGW and link against a library compiled with MSVC. Everything must be either MSVC or MInGW, not a mixture. Sounds like your issue?

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                    • JonBJ JonB

                      @Vijaykarthikeyan
                      What actual library file do you have: opencv_world470.lib or libopencv_world.a? If it is the former then it looks to me like your OpenCV is compiled with MCVC (and the path including vc16 seems to confirm that). You cannot then compile your own or Qt code with MinGW and link against a library compiled with MSVC. Everything must be either MSVC or MInGW, not a mixture. Sounds like your issue?

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                      Vijaykarthikeyan
                      wrote on last edited by
                      #16

                      @JonB .lib extension. Yeah! My compiler is MIGGW 64 bit compiler..I think you are right.. Compiler mismatches.. But,there's an option for MSVC 64 bit compiler..Will the MSVC option works for .lib?

                      JonBJ 1 Reply Last reply
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                      • V Vijaykarthikeyan

                        @JonB .lib extension. Yeah! My compiler is MIGGW 64 bit compiler..I think you are right.. Compiler mismatches.. But,there's an option for MSVC 64 bit compiler..Will the MSVC option works for .lib?

                        JonBJ Online
                        JonBJ Online
                        JonB
                        wrote on last edited by
                        #17

                        @Vijaykarthikeyan
                        Yes. .lib is MSVC. If you want to link against that you need to compile with a (compatible version of) MSVC. If you want to stick with MinGW you will need to either obtain or compile for yourself a MinGW version of OpenCV. Qt works with either compiler (so long as you have right libraries for chosen one).

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                        • JonBJ JonB

                          @Vijaykarthikeyan
                          Yes. .lib is MSVC. If you want to link against that you need to compile with a (compatible version of) MSVC. If you want to stick with MinGW you will need to either obtain or compile for yourself a MinGW version of OpenCV. Qt works with either compiler (so long as you have right libraries for chosen one).

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                          Vijaykarthikeyan
                          wrote on last edited by
                          #18

                          @JonB Thank you for your kind reply..I finally sort out the problem..but there's a 1 to 1.5 seconds delay in output..

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