Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. JSON read and write values
Forum Updated to NodeBB v4.3 + New Features

JSON read and write values

Scheduled Pinned Locked Moved Unsolved General and Desktop
29 Posts 6 Posters 4.5k Views 2 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.
  • A another_one
    19 May 2023, 11:29

    @JonB
    ok,
    At first I have got the following values in json file:
    "
    {
    "PORT": "COM3",
    "RATE": "BAUD115200",
    "PARITY": "PAR_NONE",
    "STOPBIT": "STOP_2",
    "BITS": "8",
    "LD_ADDR": "FFFFFFF085000020",
    "ST_ADDR": "FFFFFFF085000020",
    "MEM_TYPE": "LWord",
    "MEM_ADDR": "FFFFFFF085000000",
    "FILE_LOAD": "C:/tmp",
    }
    "

    And in code I do the followin:

    1. open json file:
     QFile file_json(QString::fromStdString("monMK.json"));
        if (!file_json.open(QFile::WriteOnly | QFile::Text | QFile::Append)) {
            qDebug() << "json didnt opened";
    
       }
        else
        {
            qDebug() << "json oponed";
            QString strReply = (QString)file_json.readAll();
            QJsonDocument jsonResponse = QJsonDocument::fromJson(strReply.toUtf8());
    
    1. Here I ment what my json file is already copied in memory (in jsonResponse), so I close the file:
      file_json.close();
    2. Now I do edition:
     QJsonObject jsonObject = jsonResponse.object();
     jsonObject["FILE_LOAD"] = "C:/temp";
    jsonResponse.setObject(jsonObject);
    
    1. And now I store it back:
      file_json.open(QFile::WriteOnly | QFile::Text | QFile::ReadWrite);
      file_json.write(jsonResponse.toJson());
    

    As a result I have got the following jnson file context:
    "
    {
    "FILE_LOAD": "C:/temp"
    }
    15200",
    "PARITY": "PAR_NONE",
    "STOPBIT": "STOP_2",
    "BITS": "8",
    "LD_ADDR": "FFFFFFF085000020",
    "ST_ADDR": "FFFFFFF085000020",
    "MEM_TYPE": "LWord",
    "MEM_ADDR": "FFFFFFF085000000",
    "FILE_LOAD": "C:/tmp",
    }
    "

    J Offline
    J Offline
    JonB
    wrote on 19 May 2023, 11:43 last edited by JonB
    #13

    @another_one
    This is getting crazy. You already had code which read in your JSON from file. Now you open a file for WriteOnly + Append initially, even though we said to open it for read, and then you try to read from it.

    Further in the second stage you open a file for WriteOnly + ReadWrite when we said to overwrite.

    1 Reply Last reply
    1
    • A another_one
      19 May 2023, 11:29

      @JonB
      ok,
      At first I have got the following values in json file:
      "
      {
      "PORT": "COM3",
      "RATE": "BAUD115200",
      "PARITY": "PAR_NONE",
      "STOPBIT": "STOP_2",
      "BITS": "8",
      "LD_ADDR": "FFFFFFF085000020",
      "ST_ADDR": "FFFFFFF085000020",
      "MEM_TYPE": "LWord",
      "MEM_ADDR": "FFFFFFF085000000",
      "FILE_LOAD": "C:/tmp",
      }
      "

      And in code I do the followin:

      1. open json file:
       QFile file_json(QString::fromStdString("monMK.json"));
          if (!file_json.open(QFile::WriteOnly | QFile::Text | QFile::Append)) {
              qDebug() << "json didnt opened";
      
         }
          else
          {
              qDebug() << "json oponed";
              QString strReply = (QString)file_json.readAll();
              QJsonDocument jsonResponse = QJsonDocument::fromJson(strReply.toUtf8());
      
      1. Here I ment what my json file is already copied in memory (in jsonResponse), so I close the file:
        file_json.close();
      2. Now I do edition:
       QJsonObject jsonObject = jsonResponse.object();
       jsonObject["FILE_LOAD"] = "C:/temp";
      jsonResponse.setObject(jsonObject);
      
      1. And now I store it back:
        file_json.open(QFile::WriteOnly | QFile::Text | QFile::ReadWrite);
        file_json.write(jsonResponse.toJson());
      

      As a result I have got the following jnson file context:
      "
      {
      "FILE_LOAD": "C:/temp"
      }
      15200",
      "PARITY": "PAR_NONE",
      "STOPBIT": "STOP_2",
      "BITS": "8",
      "LD_ADDR": "FFFFFFF085000020",
      "ST_ADDR": "FFFFFFF085000020",
      "MEM_TYPE": "LWord",
      "MEM_ADDR": "FFFFFFF085000000",
      "FILE_LOAD": "C:/tmp",
      }
      "

      M Offline
      M Offline
      mzimmers
      wrote on 19 May 2023, 13:44 last edited by
      #14

      @another_one your JSON logic now looks OK, but your file handling is wrong.

          QFile qf("./test.json");
          QByteArray qba;
          QJsonParseError qjpe;
          QJsonDocument qjd;
      
          qf.open(QFile::ReadOnly);
          qba = qf.readAll();
          qf.close();
          qjd = QJsonDocument::fromJson(qba, &qjpe);
          QJsonObject qjo = qjd.object();
          qjo["FILE_LOAD"] = "D:/tmp";
          qjd.setObject(qjo);
      
          qf.open(QFile::WriteOnly);
          qba = qjd.toJson();
          qf.write(qba);
          qf.close();
      
      
      S 1 Reply Last reply 19 May 2023, 13:50
      2
      • M mzimmers
        19 May 2023, 13:44

        @another_one your JSON logic now looks OK, but your file handling is wrong.

            QFile qf("./test.json");
            QByteArray qba;
            QJsonParseError qjpe;
            QJsonDocument qjd;
        
            qf.open(QFile::ReadOnly);
            qba = qf.readAll();
            qf.close();
            qjd = QJsonDocument::fromJson(qba, &qjpe);
            QJsonObject qjo = qjd.object();
            qjo["FILE_LOAD"] = "D:/tmp";
            qjd.setObject(qjo);
        
            qf.open(QFile::WriteOnly);
            qba = qjd.toJson();
            qf.write(qba);
            qf.close();
        
        
        S Offline
        S Offline
        SGaist
        Lifetime Qt Champion
        wrote on 19 May 2023, 13:50 last edited by
        #15

        In addition to what @mzimmers wrote, stop your C style casting. This is very wrong. QByteArray and QString are two very different beasts.

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

        A 1 Reply Last reply 23 May 2023, 17:28
        0
        • S SGaist
          19 May 2023, 13:50

          In addition to what @mzimmers wrote, stop your C style casting. This is very wrong. QByteArray and QString are two very different beasts.

          A Offline
          A Offline
          another_one
          wrote on 23 May 2023, 17:28 last edited by
          #16

          @SGaist Thank you!

          almost everything worked
          At the setup ui I write values to JSON file
          But when I trying to write during filedialog launched by button clicking its not working

           QFile file_json2(QString::fromStdString("./monMK.json"));
                      if (!file_json2.open(QFile::ReadOnly))
                      {
                          qDebug() << "json didnt opened";
                      }
                      else
                      {
                          qDebug() << "json oponed";
                          QString strReply2 = (QString)file_json2.readAll();
                          qDebug() << strReply2;
          
                          file_json2.close();
                          QJsonDocument jsonResponse2 = QJsonDocument::fromJson(strReply2.toUtf8());
                          QJsonObject jsonObject2 = jsonResponse2.object();
          
                          jsonObject2["FILE_LOAD"] = g_FILE_LOAD;
                          jsonResponse2.setObject(jsonObject2);
                          file_json2.open(QFile::WriteOnly);
          
                          file_json2.write(jsonResponse2.toJson());
                          qDebug() << "g_FILE_LOAD" << g_FILE_LOAD;
                          file_json2.close();
                          qDebug() << strReply2;
          
                      }
          

          As I understand its not possible cause of another processing
          and I should do JSON file storing by slot function emitted from filedialog of button processing
          But I don't undestand how to do an object which has to be as emitter of signal

          Please help!

          J 1 Reply Last reply 23 May 2023, 18:39
          0
          • A another_one
            23 May 2023, 17:28

            @SGaist Thank you!

            almost everything worked
            At the setup ui I write values to JSON file
            But when I trying to write during filedialog launched by button clicking its not working

             QFile file_json2(QString::fromStdString("./monMK.json"));
                        if (!file_json2.open(QFile::ReadOnly))
                        {
                            qDebug() << "json didnt opened";
                        }
                        else
                        {
                            qDebug() << "json oponed";
                            QString strReply2 = (QString)file_json2.readAll();
                            qDebug() << strReply2;
            
                            file_json2.close();
                            QJsonDocument jsonResponse2 = QJsonDocument::fromJson(strReply2.toUtf8());
                            QJsonObject jsonObject2 = jsonResponse2.object();
            
                            jsonObject2["FILE_LOAD"] = g_FILE_LOAD;
                            jsonResponse2.setObject(jsonObject2);
                            file_json2.open(QFile::WriteOnly);
            
                            file_json2.write(jsonResponse2.toJson());
                            qDebug() << "g_FILE_LOAD" << g_FILE_LOAD;
                            file_json2.close();
                            qDebug() << strReply2;
            
                        }
            

            As I understand its not possible cause of another processing
            and I should do JSON file storing by slot function emitted from filedialog of button processing
            But I don't undestand how to do an object which has to be as emitter of signal

            Please help!

            J Offline
            J Offline
            JonB
            wrote on 23 May 2023, 18:39 last edited by JonB
            #17

            @another_one
            None of the "file dialog" or "slot" or "signal" stuff you mention should be of any relevance. Your code looks like it should work OK. Why don't you say something descriptive rather than "its not working" if you're a programmer and you want help?

            A 1 Reply Last reply 24 May 2023, 18:10
            0
            • J JonB
              23 May 2023, 18:39

              @another_one
              None of the "file dialog" or "slot" or "signal" stuff you mention should be of any relevance. Your code looks like it should work OK. Why don't you say something descriptive rather than "its not working" if you're a programmer and you want help?

              A Offline
              A Offline
              another_one
              wrote on 24 May 2023, 18:10 last edited by
              #18

              @JonB
              Thank you for your replay!

              I'm trying to strore the file path in JSON value "FILE_LOAD" in processing of selecting *.bin file in windows folder
              To do what I click on "open_folder" button below:

              void M_m::on_open_folder_clicked()
              {
              
                      QDir dir2;
                      dir2.setCurrent(g_FILE_LOAD);
                      QString nameFile2 = QFileDialog::getOpenFileName(this, tr("load bin"),"",        tr("*.bin"));
                      if (nameFile2.isEmpty())	
                      {
                          return;
                      }
                      else
                      {
                          QFile file;
                          file.setFileName(nameFile2);
                          ui->lineEdit->setStyleSheet("color: green;  background-color: white");
                          ui->lineEdit->setText(nameFile2);
                          QFileInfo nameSt(file);
                          QString name = nameSt.fileName();
                          qDebug()<<"objectNAme="<<file.objectName();//.fileName();
                          dir2 = nameSt.dir();//.absoluteDir();
                          g_FILE_LOAD = nameFile2;
                          qDebug() << QString::number((unsigned int)fls, 16);
                          fs2->setValue(3);
                      }
              }
              
              

              where fs2->setValue(3); launch Slot function in which I do the following:

                QFile file_json3(QString::fromStdString("monMK.json"));
                          if (!file_json3.open(QFile::ReadOnly))
                          {
                              qDebug() << "json didnt opened";
                          }
                          else
                          {
                              qDebug() << "json value3 opened";
                              QString strReply3 = (QString)file_json3.readAll();
                              qDebug() << strReply3; // read JSON in debug
                              QJsonDocument jsonResponse3 = QJsonDocument::fromJson(strReply3.toUtf8());
                              QJsonObject jsonObject3 = jsonResponse3.object();
                              file_json3.close();
                              jsonObject3["FILE_LOAD"] =g_FILE_LOAD;
                              jsonResponse3.setObject(jsonObject3);
                              file_json3.open(QFile::WriteOnly);
                              file_json3.write(jsonResponse3.toJson());
                              qDebug() << "g_FILE_LOAD" << "C:/temp"; // g_FILE_LOAD;
                              file_json3.close();
                              qDebug() << strReply3;
                              qDebug() << "store finished";
              
                          }
              

              And only in what case my writing to JSON file is not working
              Also I do the almost the same - I store another value from another button clicking in which I use more simplier processing whithout file dialog and it is working
              And I compared whese two cases and as result I got the following:
              In more simplier case I read JSON in debug and that is correct:
              "
              json value 1 oponed
              QJsonValue(string, "FFFFFFF085000020")
              "{\n "BITS": "8",\n "FILE_COMP": "Undefined",\n "FILE_LOAD": "C:/temp",\n "FLOAD": "C:/temp",\n "LD_ADDR": "FFFFFFF085000020",\n "MEM_ADDR": "FFFFFFF085000000",\n "MEM_TYPE": "LWord",\n "PARITY": "PAR_NONE",\n "PORT": "COM3",\n "RATE": "115200",\n "STOPBIT": "STOP_2",\n "ST_ADDR": "FFFFFFF085000000"\n}\n"
              "
              In case with problem of storing I read JSON in debug and that is not correct:
              "
              json value3 oponed
              "{\n "FILE_LOAD": "C:/tmp",\n "PORT": "PORT20"\n}\n"
              g_FILE_LOAD C:/temp
              "{\n "FILE_LOAD": "C:/tmp",\n "PORT": "PORT20"\n}\n"
              "
              And maybe because of what I can not do right writing

              So please help to figure out

              Thanks!

              J 1 Reply Last reply 24 May 2023, 20:38
              0
              • A another_one
                24 May 2023, 18:10

                @JonB
                Thank you for your replay!

                I'm trying to strore the file path in JSON value "FILE_LOAD" in processing of selecting *.bin file in windows folder
                To do what I click on "open_folder" button below:

                void M_m::on_open_folder_clicked()
                {
                
                        QDir dir2;
                        dir2.setCurrent(g_FILE_LOAD);
                        QString nameFile2 = QFileDialog::getOpenFileName(this, tr("load bin"),"",        tr("*.bin"));
                        if (nameFile2.isEmpty())	
                        {
                            return;
                        }
                        else
                        {
                            QFile file;
                            file.setFileName(nameFile2);
                            ui->lineEdit->setStyleSheet("color: green;  background-color: white");
                            ui->lineEdit->setText(nameFile2);
                            QFileInfo nameSt(file);
                            QString name = nameSt.fileName();
                            qDebug()<<"objectNAme="<<file.objectName();//.fileName();
                            dir2 = nameSt.dir();//.absoluteDir();
                            g_FILE_LOAD = nameFile2;
                            qDebug() << QString::number((unsigned int)fls, 16);
                            fs2->setValue(3);
                        }
                }
                
                

                where fs2->setValue(3); launch Slot function in which I do the following:

                  QFile file_json3(QString::fromStdString("monMK.json"));
                            if (!file_json3.open(QFile::ReadOnly))
                            {
                                qDebug() << "json didnt opened";
                            }
                            else
                            {
                                qDebug() << "json value3 opened";
                                QString strReply3 = (QString)file_json3.readAll();
                                qDebug() << strReply3; // read JSON in debug
                                QJsonDocument jsonResponse3 = QJsonDocument::fromJson(strReply3.toUtf8());
                                QJsonObject jsonObject3 = jsonResponse3.object();
                                file_json3.close();
                                jsonObject3["FILE_LOAD"] =g_FILE_LOAD;
                                jsonResponse3.setObject(jsonObject3);
                                file_json3.open(QFile::WriteOnly);
                                file_json3.write(jsonResponse3.toJson());
                                qDebug() << "g_FILE_LOAD" << "C:/temp"; // g_FILE_LOAD;
                                file_json3.close();
                                qDebug() << strReply3;
                                qDebug() << "store finished";
                
                            }
                

                And only in what case my writing to JSON file is not working
                Also I do the almost the same - I store another value from another button clicking in which I use more simplier processing whithout file dialog and it is working
                And I compared whese two cases and as result I got the following:
                In more simplier case I read JSON in debug and that is correct:
                "
                json value 1 oponed
                QJsonValue(string, "FFFFFFF085000020")
                "{\n "BITS": "8",\n "FILE_COMP": "Undefined",\n "FILE_LOAD": "C:/temp",\n "FLOAD": "C:/temp",\n "LD_ADDR": "FFFFFFF085000020",\n "MEM_ADDR": "FFFFFFF085000000",\n "MEM_TYPE": "LWord",\n "PARITY": "PAR_NONE",\n "PORT": "COM3",\n "RATE": "115200",\n "STOPBIT": "STOP_2",\n "ST_ADDR": "FFFFFFF085000000"\n}\n"
                "
                In case with problem of storing I read JSON in debug and that is not correct:
                "
                json value3 oponed
                "{\n "FILE_LOAD": "C:/tmp",\n "PORT": "PORT20"\n}\n"
                g_FILE_LOAD C:/temp
                "{\n "FILE_LOAD": "C:/tmp",\n "PORT": "PORT20"\n}\n"
                "
                And maybe because of what I can not do right writing

                So please help to figure out

                Thanks!

                J Offline
                J Offline
                JonB
                wrote on 24 May 2023, 20:38 last edited by JonB
                #19

                @another_one
                I don't know. suggest you put qDebug() statements after each line as you change the JSON to see what's going on where. The fact that you use a dialog to get a pathname from the user cannot be relevant.

                QString strReply3 = (QString)file_json3.readAll(); do not use this. Use a suitable QString method.

                J A 2 Replies Last reply 25 May 2023, 06:02
                0
                • J JonB
                  24 May 2023, 20:38

                  @another_one
                  I don't know. suggest you put qDebug() statements after each line as you change the JSON to see what's going on where. The fact that you use a dialog to get a pathname from the user cannot be relevant.

                  QString strReply3 = (QString)file_json3.readAll(); do not use this. Use a suitable QString method.

                  J Offline
                  J Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on 25 May 2023, 06:02 last edited by
                  #20

                  @JonB said in JSON read and write values:

                  do not use this. Use a suitable QString method.

                  @another_one @SGaist wrote that several times already, don't know why you're not lisening...

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  0
                  • J JonB
                    24 May 2023, 20:38

                    @another_one
                    I don't know. suggest you put qDebug() statements after each line as you change the JSON to see what's going on where. The fact that you use a dialog to get a pathname from the user cannot be relevant.

                    QString strReply3 = (QString)file_json3.readAll(); do not use this. Use a suitable QString method.

                    A Offline
                    A Offline
                    another_one
                    wrote on 25 May 2023, 08:25 last edited by
                    #21

                    @JonB said in JSON read and write values:

                    Use a suitable QString method.

                    Sorry I didint undestand, what is why I still do not use what
                    Could you bring some example?, please

                    J 1 Reply Last reply 25 May 2023, 10:07
                    0
                    • A another_one
                      25 May 2023, 08:25

                      @JonB said in JSON read and write values:

                      Use a suitable QString method.

                      Sorry I didint undestand, what is why I still do not use what
                      Could you bring some example?, please

                      J Offline
                      J Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on 25 May 2023, 10:07 last edited by
                      #22

                      @another_one You can't use C-style cast to cat a QByteArray to QString.
                      Use one of the from* methods like https://doc.qt.io/qt-6/qstring.html#fromLatin1-2 depending on the used encoding.

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                      A 1 Reply Last reply 25 May 2023, 11:06
                      0
                      • J jsulm
                        25 May 2023, 10:07

                        @another_one You can't use C-style cast to cat a QByteArray to QString.
                        Use one of the from* methods like https://doc.qt.io/qt-6/qstring.html#fromLatin1-2 depending on the used encoding.

                        A Offline
                        A Offline
                        another_one
                        wrote on 25 May 2023, 11:06 last edited by
                        #23

                        @jsulm
                        Now I undestand, sorry, I need to do readall in QbyteArray as mzimmers already recomended
                        Thanks to all!

                        A 1 Reply Last reply 25 May 2023, 12:06
                        0
                        • A another_one
                          25 May 2023, 11:06

                          @jsulm
                          Now I undestand, sorry, I need to do readall in QbyteArray as mzimmers already recomended
                          Thanks to all!

                          A Offline
                          A Offline
                          another_one
                          wrote on 25 May 2023, 12:06 last edited by
                          #24

                          @another_one

                          I did recomended changes but unfortunally it doesn help!

                                      QFile file_json3(QString::fromStdString("monMK.json"));
                                      if (!file_json3.open(QFile::ReadOnly))
                                      {
                                          qDebug() << "json didnt opened";
                                      }
                                      else
                                      {
                                          QByteArray qba3;
                                          QJsonParseError qjpe3;
                                          qba3 = file_json3.readAll();
                                          file_json3.close();
                                          QJsonDocument jsonResponse3 = QJsonDocument::fromJson(qba3, &qjpe3);
                                          QJsonObject jsonObject3 = jsonResponse3.object();
                                          jsonObject3["FILE_LOAD"] =  g_FILE_LOAD;
                                          jsonResponse3.setObject(jsonObject3);
                                          file_json3.open(QFile::WriteOnly);
                                          qba3 = jsonResponse3.toJson();
                                          file_json3.write(qba3);
                                          file_json3.close();
                                          qDebug() << qba3;
                                          qDebug() << "store finished";
                          
                                      }
                          
                          S 1 Reply Last reply 25 May 2023, 19:12
                          0
                          • A another_one
                            25 May 2023, 12:06

                            @another_one

                            I did recomended changes but unfortunally it doesn help!

                                        QFile file_json3(QString::fromStdString("monMK.json"));
                                        if (!file_json3.open(QFile::ReadOnly))
                                        {
                                            qDebug() << "json didnt opened";
                                        }
                                        else
                                        {
                                            QByteArray qba3;
                                            QJsonParseError qjpe3;
                                            qba3 = file_json3.readAll();
                                            file_json3.close();
                                            QJsonDocument jsonResponse3 = QJsonDocument::fromJson(qba3, &qjpe3);
                                            QJsonObject jsonObject3 = jsonResponse3.object();
                                            jsonObject3["FILE_LOAD"] =  g_FILE_LOAD;
                                            jsonResponse3.setObject(jsonObject3);
                                            file_json3.open(QFile::WriteOnly);
                                            qba3 = jsonResponse3.toJson();
                                            file_json3.write(qba3);
                                            file_json3.close();
                                            qDebug() << qba3;
                                            qDebug() << "store finished";
                            
                                        }
                            
                            S Offline
                            S Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on 25 May 2023, 19:12 last edited by SGaist
                            #25

                            @another_one said in JSON read and write values:

                            @another_one

                                        QJsonParseError qjpe3;
                                        qba3 = file_json3.readAll();
                                        file_json3.close();
                                        QJsonDocument jsonResponse3 = QJsonDocument::fromJson(qba3, &qjpe3);
                            

                            What about checking what qjpe3 contains ?

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

                            C 1 Reply Last reply 25 May 2023, 19:43
                            0
                            • S SGaist
                              25 May 2023, 19:12

                              @another_one said in JSON read and write values:

                              @another_one

                                          QJsonParseError qjpe3;
                                          qba3 = file_json3.readAll();
                                          file_json3.close();
                                          QJsonDocument jsonResponse3 = QJsonDocument::fromJson(qba3, &qjpe3);
                              

                              What about checking what qjpe3 contains ?

                              C Offline
                              C Offline
                              Christian Ehrlicher
                              Lifetime Qt Champion
                              wrote on 25 May 2023, 19:43 last edited by
                              #26

                              @SGaist said in JSON read and write values:

                              Why about checking what qjpe3 contains ?

                              And on the next line don't ignore qjpe3. Doing basically no error checking and the onwdering why it does not work...

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

                              A 1 Reply Last reply 29 May 2023, 11:07
                              0
                              • C Christian Ehrlicher
                                25 May 2023, 19:43

                                @SGaist said in JSON read and write values:

                                Why about checking what qjpe3 contains ?

                                And on the next line don't ignore qjpe3. Doing basically no error checking and the onwdering why it does not work...

                                A Offline
                                A Offline
                                another_one
                                wrote on 29 May 2023, 11:07 last edited by
                                #27

                                @Christian-Ehrlicher

                                Thanks to all!, At last I found an error in on_open_folder_clicked()

                                J 1 Reply Last reply 29 May 2023, 11:28
                                0
                                • A another_one
                                  29 May 2023, 11:07

                                  @Christian-Ehrlicher

                                  Thanks to all!, At last I found an error in on_open_folder_clicked()

                                  J Offline
                                  J Offline
                                  JonB
                                  wrote on 29 May 2023, 11:28 last edited by
                                  #28

                                  @another_one And what was that error, given that you showed us the full source code of that function?

                                  A 1 Reply Last reply 2 Jun 2023, 10:36
                                  0
                                  • J JonB
                                    29 May 2023, 11:28

                                    @another_one And what was that error, given that you showed us the full source code of that function?

                                    A Offline
                                    A Offline
                                    another_one
                                    wrote on 2 Jun 2023, 10:36 last edited by
                                    #29

                                    @JonB

                                    Hello!

                                    I find what reason by elimination method
                                    And on_open_folder_clicked() become the following:

                                    void M_m::on_open_folder_clicked()
                                    {
                                               QFileDialog dialog(this);
                                               dialog.setFileMode(QFileDialog::Directory);
                                               QString nameFile2 = dialog.getOpenFileName(this, tr("load bin"),"",        tr("*.bin"));
                                               qDebug() << "file name at first "<< nameFile2;
                                               if (nameFile2.isEmpty())	
                                               {
                                                return;
                                    			}
                                    			else
                                    			{
                                    				qDebug() << "dirdir2";
                                    				ui->lineEdit->setStyleSheet("color: green;  background-color: white");
                                    				ui->lineEdit->setText(nameFile2);
                                    				g_FILE_LOAD = nameFile2;
                                    
                                    				qDebug() << QString::number((unsigned int)fls, 16);
                                    	  
                                    				ui->lineEdit->setStyleSheet("color: green;  background-color: white");
                                    				ui->lineEdit->setText(nameFile2);
                                    				qDebug() << "new g_FILE_LOAD" << g_FILE_LOAD;
                                    		  
                                    			 }
                                    			fs2->setValue(3);
                                    }
                                    
                                    1 Reply Last reply
                                    0

                                    22/29

                                    25 May 2023, 10:07

                                    • Login

                                    • Login or register to search.
                                    22 out of 29
                                    • First post
                                      22/29
                                      Last post
                                    0
                                    • Categories
                                    • Recent
                                    • Tags
                                    • Popular
                                    • Users
                                    • Groups
                                    • Search
                                    • Get Qt Extensions
                                    • Unsolved