Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. QML and Qt Quick
  4. Failed to get image from provider
Qt 6.11 is out! See what's new in the release blog

Failed to get image from provider

Scheduled Pinned Locked Moved Unsolved QML and Qt Quick
19 Posts 4 Posters 4.2k Views 4 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • 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
        0
        • 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
              0
              • 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
                                0

                                • Login

                                • Login or register to search.
                                • First post
                                  Last post
                                0
                                • Categories
                                • Recent
                                • Tags
                                • Popular
                                • Users
                                • Groups
                                • Search
                                • Get Qt Extensions
                                • Unsolved