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  4. How to make sure my compiled qt(or my application) linked against a specific DirectX library?
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How to make sure my compiled qt(or my application) linked against a specific DirectX library?

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  • L Offline
    L Offline
    LinArcX
    wrote on 26 Dec 2020, 10:46 last edited by LinArcX
    #1

    Hi.
    Look at this issue:
    https://forum.qt.io/topic/122071/can-t-play-video-on-windows-xp/20

    Long story short: I compiled qt 5.6.3 on windows7 that has DirectX11 and created A WidgetBased application that uses this kit and deployed it on windows xp that has DirectX9.

    I want to know that is there anyway to compile qt(or qtmultimedia module) against a specific version of DirectX, say 9?

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    • C Offline
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      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on 26 Dec 2020, 11:15 last edited by
      #2

      @LinArcX said in How to make sure my compiled qt(or my application) linked against a specific DirectX library?:

      I want to know that is there anyway to compile qt(or qtmultimedia module) against a specific version of DirectX, say 9?

      No direct. Comile Qt on WinXP where DirectX11 is not available

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
      Visit the Qt Academy at https://academy.qt.io/catalog

      L 1 Reply Last reply 26 Dec 2020, 12:20
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      • C Christian Ehrlicher
        26 Dec 2020, 11:15

        @LinArcX said in How to make sure my compiled qt(or my application) linked against a specific DirectX library?:

        I want to know that is there anyway to compile qt(or qtmultimedia module) against a specific version of DirectX, say 9?

        No direct. Comile Qt on WinXP where DirectX11 is not available

        L Offline
        L Offline
        LinArcX
        wrote on 26 Dec 2020, 12:20 last edited by
        #3

        @Christian-Ehrlicher

        I can't. Since VisualStudio 2013 not available for this os.

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          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on 26 Dec 2020, 12:23 last edited by
          #4

          Then you have to use an older MSVC. If you want to support such old stuff you have to make sure you've a dev environment which supports it too.

          Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
          Visit the Qt Academy at https://academy.qt.io/catalog

          L 1 Reply Last reply 26 Dec 2020, 12:32
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          • C Christian Ehrlicher
            26 Dec 2020, 12:23

            Then you have to use an older MSVC. If you want to support such old stuff you have to make sure you've a dev environment which supports it too.

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            LinArcX
            wrote on 26 Dec 2020, 12:32 last edited by
            #5

            @Christian-Ehrlicher

            Can i compile just multimedia against MSVC2010 and link it to my application that compiled with MSVC2013?

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            • B Offline
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              Bonnie
              wrote on 26 Dec 2020, 13:31 last edited by
              #6

              @LinArcX

              Can i compile just multimedia against MSVC2010 and link it to my application that compiled with MSVC2013?

              That's not possible.
              But I'm sure it is possible to build a dll linking to dx libs by msvc2013 on windows 7 and loadable on xp, because I had done that years ago (but maybe not the same libs with qt multimedia).
              Unfortunately I don't have that enviroment anymore (msvc2013/win7/standalone directx), so I can't tell how.
              One choice is to just use the prebuilt 5.5.1, as I remember it supports xp well.

              L 1 Reply Last reply 26 Dec 2020, 13:57
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              • B Bonnie
                26 Dec 2020, 13:31

                @LinArcX

                Can i compile just multimedia against MSVC2010 and link it to my application that compiled with MSVC2013?

                That's not possible.
                But I'm sure it is possible to build a dll linking to dx libs by msvc2013 on windows 7 and loadable on xp, because I had done that years ago (but maybe not the same libs with qt multimedia).
                Unfortunately I don't have that enviroment anymore (msvc2013/win7/standalone directx), so I can't tell how.
                One choice is to just use the prebuilt 5.5.1, as I remember it supports xp well.

                L Offline
                L Offline
                LinArcX
                wrote on 26 Dec 2020, 13:57 last edited by
                #7

                @Bonnie
                I should stick with 5.6.3 and as i know it doesn't support Xp by default.(You should compile it and pass -target xp to configure)

                Maybe i should downgrade my msvc to 2010, build multimedia module on Xp with ds9 and build rest of qt on windows7 with default DirectX.

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                26 Dec 2020, 10:46

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