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Problems in practicing and running an example

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  • tomyT Offline
    tomyT Offline
    tomy
    wrote on last edited by tomy
    #1

    Hi all,

    I'm reading this example and did the following works:

    1- Using this path I created Main.qml:
    file -> New Project -> (File and Classes) Qt -> QML File (Qt Quick 2) -> choose -> Main -> Finish.

    2- Typed the code in the image below in main.qml.
    3- Ran qmake -project to create .pro file. Then configured the project for all Desktop, Android Arm and Android x86. Then ran the code and it didn't work! :(

    Here is the image containing the code and the problem:
    https://ibb.co/bwrDqQ

    Have I done the project correctly please?

    1 Reply Last reply
    0
    • F Offline
      F Offline
      Fuel
      wrote on last edited by
      #2

      The Main.qml isnt in your Project Structure. That means you didnt add the File to the .pro File. After adding you need to run qmake again.

      1 Reply Last reply
      1
      • tomyT Offline
        tomyT Offline
        tomy
        wrote on last edited by
        #3

        @Fuel said in Problems in practicing and running an example:

        The Main.qml isnt in your Project Structure. That means you didnt add the File to the .pro File. After adding you need to run qmake again.

        By right-clicking on Main in Projects view I tried to add that Main.qml file but I couldn't! How to add it please?
        And what is the right method of doing such a example from the beginning please?

        1 Reply Last reply
        0
        • tomyT Offline
          tomyT Offline
          tomy
          wrote on last edited by
          #4

          How would you do that example by yourself if you were me please?

          1 Reply Last reply
          0
          • mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by mrjj
            #5

            Hi
            Did you make a QML project ?
            alt text

            You should have the following in main.cpp

            #include <QGuiApplication>
            #include <QQmlApplicationEngine>

            int main(int argc, char *argv[])
            {
            QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
            QGuiApplication app(argc, argv);

            QQmlApplicationEngine engine;
            engine.load(QUrl(QLatin1String("qrc:/main.qml")));
            
            return app.exec();
            

            }

            alt text

            1 Reply Last reply
            2
            • tomyT Offline
              tomyT Offline
              tomy
              wrote on last edited by
              #6

              Thank you. I did like what you said.
              Here are my files:
              Main.cpp, Mai.qml, Page1.qml and Page1.form.ui.qml.

              I get these errors which belong to (the path of) images I think:

              qrc:/main.qml:5:1: QML Image: Protocol "c" is unknown
              qrc:/main.qml:9:4: QML Image: Protocol "c" is unknown
              qrc:/main.qml:16:4: QML Image: Protocol "c" is unknown

              mrjjM 1 Reply Last reply
              0
              • tomyT tomy

                Thank you. I did like what you said.
                Here are my files:
                Main.cpp, Mai.qml, Page1.qml and Page1.form.ui.qml.

                I get these errors which belong to (the path of) images I think:

                qrc:/main.qml:5:1: QML Image: Protocol "c" is unknown
                qrc:/main.qml:9:4: QML Image: Protocol "c" is unknown
                qrc:/main.qml:16:4: QML Image: Protocol "c" is unknown

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #7

                @tomy said in Problems in practicing and running an example:

                qrc:/main.qml:5:1: QML Image: Protocol "c" is unknown

                its error inside file. something is not right there.
                I think they image paths are invalid
                https://stackoverflow.com/questions/17610949/protocol-c-is-unknown-error-in-qml
                You shall use URL syntax.
                or even better. use qres file and the :/file syntax

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                • tomyT Offline
                  tomyT Offline
                  tomy
                  wrote on last edited by
                  #8

                  I tested all three options.
                  The first mode faced errors.
                  The second one and third one showed nothing although had no issues!
                  What is the problem please?

                  mrjjM 1 Reply Last reply
                  0
                  • tomyT tomy

                    I tested all three options.
                    The first mode faced errors.
                    The second one and third one showed nothing although had no issues!
                    What is the problem please?

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #9

                    @tomy
                    In all cases you user the same path c:/xxxx, so i think paths are the issue.

                    1 Reply Last reply
                    0
                    • tomyT Offline
                      tomyT Offline
                      tomy
                      wrote on last edited by
                      #10

                      All images are in the same folder on my Desktop, in this address:
                      C:\Users\Abbasi\Desktop\images

                      So how should I give the paths of images to the code please?

                      mrjjM 1 Reply Last reply
                      0
                      • tomyT tomy

                        All images are in the same folder on my Desktop, in this address:
                        C:\Users\Abbasi\Desktop\images

                        So how should I give the paths of images to the code please?

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by mrjj
                        #11

                        @tomy
                        Hi
                        I would move the images to an image folder under the project.
                        Then i would use a qres file and the ":/" syntax
                        (like here engine.load(QUrl(QLatin1String("qrc:/main.qml")));)

                        https://www.youtube.com/watch?v=sWIQIi4lg58
                        http://www.bogotobogo.com/Qt/Qt5_Resource_Files.php

                        You can right click an image when inside the qres file and get path there.

                        1 Reply Last reply
                        0
                        • tomyT Offline
                          tomyT Offline
                          tomy
                          wrote on last edited by tomy
                          #12

                          Hi,

                          The purpose is to add a folder (or some files) to the project as resources to use them easier, yeah? OK, I did these:

                          According to the tuts, I created a Resource file named MyRes like this.
                          Please note that the Path there is the same path as the project (Main).

                          I use /MyFiles as the Prefix and add all 4 files, the images (from the image folder on the Desktop).
                          When adding the files, this message is appeared for all four files. I don't know what to do here.

                          mrjjM 1 Reply Last reply
                          0
                          • tomyT tomy

                            Hi,

                            The purpose is to add a folder (or some files) to the project as resources to use them easier, yeah? OK, I did these:

                            According to the tuts, I created a Resource file named MyRes like this.
                            Please note that the Path there is the same path as the project (Main).

                            I use /MyFiles as the Prefix and add all 4 files, the images (from the image folder on the Desktop).
                            When adding the files, this message is appeared for all four files. I don't know what to do here.

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

                            @tomy
                            Hi
                            Can you right click myres.qrc and choose "Add existing files" , then
                            select the images. ?

                            1 Reply Last reply
                            0
                            • tomyT Offline
                              tomyT Offline
                              tomy
                              wrote on last edited by
                              #14

                              Yes,

                              And it resulted in this!

                              mrjjM 1 Reply Last reply
                              0
                              • tomyT tomy

                                Yes,

                                And it resulted in this!

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

                                @tomy

                                That is why i wanted you to move the images to under the project.
                                The :/Myfile path is not correct. the files are not there...

                                Anyway, now right click each image and you can copy correct path to use.

                                1 Reply Last reply
                                0
                                • tomyT Offline
                                  tomyT Offline
                                  tomy
                                  wrote on last edited by
                                  #16

                                  The program runs without error but show nothing! Does it work for you please?
                                  What is the problem of this part if it's correct?

                                  You say that you would move the images to an image folder under the project. But how? If you mean using those two tuts, I tried and also posted the error I faced at that time. The current style of adding the path of images (as shown in the screenshot) is rather ugly I think moving the images into a folder under the project would be nicer and better.

                                  mrjjM 1 Reply Last reply
                                  0
                                  • tomyT tomy

                                    The program runs without error but show nothing! Does it work for you please?
                                    What is the problem of this part if it's correct?

                                    You say that you would move the images to an image folder under the project. But how? If you mean using those two tuts, I tried and also posted the error I faced at that time. The current style of adding the path of images (as shown in the screenshot) is rather ugly I think moving the images into a folder under the project would be nicer and better.

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #17

                                    @tomy
                                    Just use the normal explorer to move the files under the project
                                    Try to use the qrc:/ syntax then. Since its compiled into the
                                    .exe i assumed :/ would work.

                                    tomyT 1 Reply Last reply
                                    0
                                    • mrjjM mrjj

                                      @tomy
                                      Just use the normal explorer to move the files under the project
                                      Try to use the qrc:/ syntax then. Since its compiled into the
                                      .exe i assumed :/ would work.

                                      tomyT Offline
                                      tomyT Offline
                                      tomy
                                      wrote on last edited by tomy
                                      #18

                                      Just use the normal explorer to move the files under the project

                                      What is this please?

                                      This time I tried the following but no success again.

                                      I copied the images folder into the project folder and used an images.qrc file like this and ran the app using that prefix name. It says it cannot open the files! What is the problem this time?
                                      Where did I go wrong?

                                      1 Reply Last reply
                                      0
                                      • tomyT Offline
                                        tomyT Offline
                                        tomy
                                        wrote on last edited by
                                        #19

                                        Tried again using a new project named Main3 as below, copying the image folder into the project folder.
                                        Here is the content of the files:
                                        main3.pro
                                        main.cpp
                                        images.qrc
                                        main.qml
                                        page1.qml
                                        Page1Form.ui.qml
                                        qtquickcontrols2.conf

                                        The program runs:
                                        Issues window shows nothing.
                                        Application Output shows this:
                                        Starting C:\Users\Abbasi\Documents\QML\Main3\Main3\build-Main3-Desktop_Qt_5_9_0_MinGW_32bit-Debug\debug\Main3.exe...
                                        QML debugging is enabled. Only use this in a safe environment.

                                        Compile Output shows:
                                        12:35:55: Elapsed time: 00:00.

                                        And General Messages shows nothing.

                                        The app shows nothing as the output.
                                        What is the problem? Why can't I run this example successfully?
                                        Why everything with Qt is that complicated and confusing?

                                        mrjjM 1 Reply Last reply
                                        0
                                        • tomyT tomy

                                          Tried again using a new project named Main3 as below, copying the image folder into the project folder.
                                          Here is the content of the files:
                                          main3.pro
                                          main.cpp
                                          images.qrc
                                          main.qml
                                          page1.qml
                                          Page1Form.ui.qml
                                          qtquickcontrols2.conf

                                          The program runs:
                                          Issues window shows nothing.
                                          Application Output shows this:
                                          Starting C:\Users\Abbasi\Documents\QML\Main3\Main3\build-Main3-Desktop_Qt_5_9_0_MinGW_32bit-Debug\debug\Main3.exe...
                                          QML debugging is enabled. Only use this in a safe environment.

                                          Compile Output shows:
                                          12:35:55: Elapsed time: 00:00.

                                          And General Messages shows nothing.

                                          The app shows nothing as the output.
                                          What is the problem? Why can't I run this example successfully?
                                          Why everything with Qt is that complicated and confusing?

                                          mrjjM Offline
                                          mrjjM Offline
                                          mrjj
                                          Lifetime Qt Champion
                                          wrote on last edited by mrjj
                                          #20

                                          @tomy
                                          You are still having issues with the paths/syntax
                                          The path you use is invalid
                                          Should have the form
                                          qrc:/images/filename.png

                                          Use the right click menu to make sure its correct.

                                          1 Reply Last reply
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