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Failed to get image from provider

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  • mrjjM mrjj

    Hi
    The path seems wrong
    image://pix/file:///C:/Users/gabor/Pictures/133CANON/IMG_3344.JPG

    Why do you both add the image provider id (pix) and at the same time
    give it a fully qualified path to a file?

    This seems wrong to me ?
    image.source = "image://pix/" + fileDialog.fileUrl

    should it just not be ?
    image.source = fileDialog.fileUrl

    G Offline
    G Offline
    gabor53
    wrote on last edited by
    #5

    Hi @mrjj ,
    I am trying to use the image provider that's why I used

    image.source = "image://pix/" + fileDialog.fileUrl
    ``
    I am trying to create a pixmap and use QML to save it to localstorage.
    mrjjM 1 Reply Last reply
    0
    • G gabor53

      Hi @mrjj ,
      I am trying to use the image provider that's why I used

      image.source = "image://pix/" + fileDialog.fileUrl
      ``
      I am trying to create a pixmap and use QML to save it to localstorage.
      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #6

      @gabor53
      Hi
      Ok, but are you sure the QQuickImageProvider should be involved in the
      saving of the image?
      The syntax "image://pix/" seems for loading only, docs mention nothing about saving.
      Anyway, i was just wondering.

      G 1 Reply Last reply
      0
      • G gabor53

        @SGaist ,
        Yes. According to qDebug the content is

        MakePix requestPixmap id:  "file:///C:/Users/gabor/Pictures/133CANON/IMG_3344.jpg
        ``
        sierdzioS Offline
        sierdzioS Offline
        sierdzio
        Moderators
        wrote on last edited by
        #7

        @gabor53 said in Failed to get image from provider:

        @SGaist ,
        Yes. According to qDebug the content is

        MakePix requestPixmap id:  "file:///C:/Users/gabor/Pictures/133CANON/IMG_3344.jpg
        ``
        

        You need to remove file:/// from that URL, otherwise QPixmap won't handle it.

        As others note, however - it seems you don't need an image provider here at all. QML can handle JPG images out of the box.

        (Z(:^

        G 1 Reply Last reply
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        • sierdzioS sierdzio

          @gabor53 said in Failed to get image from provider:

          @SGaist ,
          Yes. According to qDebug the content is

          MakePix requestPixmap id:  "file:///C:/Users/gabor/Pictures/133CANON/IMG_3344.jpg
          ``
          

          You need to remove file:/// from that URL, otherwise QPixmap won't handle it.

          As others note, however - it seems you don't need an image provider here at all. QML can handle JPG images out of the box.

          G Offline
          G Offline
          gabor53
          wrote on last edited by
          #8

          Hi @sierdzio ,
          It is true, but how can I save the jpg to localstorage?
          Thank you.

          1 Reply Last reply
          0
          • sierdzioS Offline
            sierdzioS Offline
            sierdzio
            Moderators
            wrote on last edited by
            #9

            You mean you want to take the jpg from one location and save it in another? Use QFile::copy().

            (Z(:^

            G 1 Reply Last reply
            0
            • sierdzioS sierdzio

              You mean you want to take the jpg from one location and save it in another? Use QFile::copy().

              G Offline
              G Offline
              gabor53
              wrote on last edited by
              #10

              @sierdzio
              I want to save the actual image to a db.

              1 Reply Last reply
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              • mrjjM mrjj

                @gabor53
                Hi
                Ok, but are you sure the QQuickImageProvider should be involved in the
                saving of the image?
                The syntax "image://pix/" seems for loading only, docs mention nothing about saving.
                Anyway, i was just wondering.

                G Offline
                G Offline
                gabor53
                wrote on last edited by
                #11

                @mrjj,
                The goal is to save the actual jpg into Qt Quick Local Storage. To do that I need to create a Blob from the jpg file. I don't think it is possible to do in QML; that's why I use QQuickImageProvider to send the image from QML to C++ and return a pixmap to QML.
                If I copy 1.jpg to the qml folder and pass1.jpg to QQuickImageProvider the image is correctly displayed, which means the path I get from fileDialog.fileUrl is incorrect.
                How can I fix the path so fileDialog.fileUrl provides the right path to the image?
                Thank you.

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

                  @sierdzio already answered that question.

                  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
                  • mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    hi
                    so you get a pixmap back to QML but how do you then convert it to the blob?
                    As far as i understand, Qt Quick Local Storage is a sqllite database so
                    you need it as QbyteArray to save it.

                    G 1 Reply Last reply
                    0
                    • mrjjM mrjj

                      hi
                      so you get a pixmap back to QML but how do you then convert it to the blob?
                      As far as i understand, Qt Quick Local Storage is a sqllite database so
                      you need it as QbyteArray to save it.

                      G Offline
                      G Offline
                      gabor53
                      wrote on last edited by
                      #14

                      @mrjj
                      Is there a way to convert pixmap into blob in QML?

                      mrjjM 1 Reply Last reply
                      0
                      • G gabor53

                        @mrjj
                        Is there a way to convert pixmap into blob in QML?

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #15

                        @gabor53
                        Hi
                        sadly i dont know QML well enough to answer that.
                        It seems it get converted to ArrayBuffer if used in signals.
                        from c++ to QML.
                        but im not sure how you can get the pixmap into that.

                        1 Reply Last reply
                        0
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #16

                          Did you already check Qt Quick Local Storage QML Types ?

                          By the way, why do you want to store images there ?

                          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
                          0
                          • SGaistS SGaist

                            Did you already check Qt Quick Local Storage QML Types ?

                            By the way, why do you want to store images there ?

                            G Offline
                            G Offline
                            gabor53
                            wrote on last edited by gabor53
                            #17

                            @SGaist ,
                            I checked Local Storage QML Types but it doesn't really talk about images.
                            I'm creating a small app where I can store an image and a description of the image. I used to do it by storing only the url, but eventually the images got moved and I ended up with a bunch of broken links.

                            1 Reply Last reply
                            0
                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #18

                              In that case, I would rather go with a more classical approach through C++ especially if you want to recover the images.

                              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
                              2
                              • SGaistS SGaist

                                In that case, I would rather go with a more classical approach through C++ especially if you want to recover the images.

                                G Offline
                                G Offline
                                gabor53
                                wrote on last edited by
                                #19

                                @SGaist
                                Thank you. I will do it that way.

                                1 Reply Last reply
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