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Open file via double-click

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  • UnitScanU UnitScan

    @JonB said in Open file via double-click:

    @UnitScan said in Open file via double-click:

    Yes, the app crashes if I try to launch it from the command line, while launching it via Explorer it works fine.

    And earlier you wrote:

    but when I open them "externally" with the double click the program crashes.

    How are these two statements consistent?

    Let me explain: if I double click on the exe file via Explorer, it starts regularly. If I launch it via cmd it crashes instead.
    If I double click on any audio file, the program opens but crashes immediately

    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by JonB
    #12

    @UnitScan

    If I launch it via cmd it crashes instead.

    So what happens if you launch it from Creator debugger, like I asked?

    Put in some qDebug() statements to see if it gets as far as your main, and then where.

    1 Reply Last reply
    1
    • UnitScanU Offline
      UnitScanU Offline
      UnitScan
      wrote on last edited by UnitScan
      #13

      I did as you asked, and this is the result:

      #include "mainwindow.h"
      #include <QApplication>
      #include <QTimer>
      #include <stdio.h>
      #include <iostream>
      
      int main(int argc, char *argv[])
      {
          for (int i = 0; i < argc; ++i) {
              std::cout << "The " << i << "th argument is " << argv[i] << std::endl;
          }
          QApplication a(argc, argv);
          MainWindow w;
          QTimer::singleShot(0, & w, SLOT(initialize()));
          w.show();
      
          return a.exec();
      }
      

      Application output in Debug mode:

      ASSERT failure in QList<T>::at: "index out of range", file C:/Qt/Qt5.14.0/5.14.0/mingw73_32/include/QtCore/qlist.h, line 571
      
      JonBJ ODБOïO 2 Replies Last reply
      0
      • UnitScanU UnitScan

        I did as you asked, and this is the result:

        #include "mainwindow.h"
        #include <QApplication>
        #include <QTimer>
        #include <stdio.h>
        #include <iostream>
        
        int main(int argc, char *argv[])
        {
            for (int i = 0; i < argc; ++i) {
                std::cout << "The " << i << "th argument is " << argv[i] << std::endl;
            }
            QApplication a(argc, argv);
            MainWindow w;
            QTimer::singleShot(0, & w, SLOT(initialize()));
            w.show();
        
            return a.exec();
        }
        

        Application output in Debug mode:

        ASSERT failure in QList<T>::at: "index out of range", file C:/Qt/Qt5.14.0/5.14.0/mingw73_32/include/QtCore/qlist.h, line 571
        
        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by JonB
        #14

        @UnitScan
        You must run it in the debugger, from Creator, not just compile for debug. Then when the ASSERT is hit and the debugger traps it you will find there is a stack trace window. That will show the qlist.h line, and then trace back through all the levels to some line in your code, which is what was being executed when the ASSERT happened.

        And please use qDebug() for debug output statements, not std::cout.

        Separately, since you persist in using SLOT(), all bets are off as to how that might behave at runtime.

        And finally, I hope you know what you're doing with seemingly initializing on a timer, seems hokey to me. You sure you understand exactly when initialize() will be executed, compared to other initializations (like in constructors) you are doing?

        1 Reply Last reply
        1
        • UnitScanU UnitScan

          I did as you asked, and this is the result:

          #include "mainwindow.h"
          #include <QApplication>
          #include <QTimer>
          #include <stdio.h>
          #include <iostream>
          
          int main(int argc, char *argv[])
          {
              for (int i = 0; i < argc; ++i) {
                  std::cout << "The " << i << "th argument is " << argv[i] << std::endl;
              }
              QApplication a(argc, argv);
              MainWindow w;
              QTimer::singleShot(0, & w, SLOT(initialize()));
              w.show();
          
              return a.exec();
          }
          

          Application output in Debug mode:

          ASSERT failure in QList<T>::at: "index out of range", file C:/Qt/Qt5.14.0/5.14.0/mingw73_32/include/QtCore/qlist.h, line 571
          
          ODБOïO Offline
          ODБOïO Offline
          ODБOï
          wrote on last edited by
          #15

          @UnitScan hi

          @UnitScan said in Open file via double-click:

          argv[i]

          this is the kind of code that can cause "index out of range" error.
          you can use
          https://doc.qt.io/qt-5/qcoreapplication.html#arguments
          or
          https://doc.qt.io/qt-5/qcommandlineparser.html
          to retrive the arguments

          JonBJ 1 Reply Last reply
          0
          • ODБOïO ODБOï

            @UnitScan hi

            @UnitScan said in Open file via double-click:

            argv[i]

            this is the kind of code that can cause "index out of range" error.
            you can use
            https://doc.qt.io/qt-5/qcoreapplication.html#arguments
            or
            https://doc.qt.io/qt-5/qcommandlineparser.html
            to retrive the arguments

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by JonB
            #16

            @LeLev
            In this case he is using main(argc, argv) correctly. The point (to me) is:

            ASSERT failure in QList<T>::at: "index out of range", file C:/Qt/Qt5.14.0/5.14.0/mingw73_32/include/QtCore/qlist.h, line 571
            

            I don't see how that can arise from his argc/argv/std::cout loop. Has to be a QList involved!

            ODБOïO 1 Reply Last reply
            1
            • UnitScanU Offline
              UnitScanU Offline
              UnitScan
              wrote on last edited by UnitScan
              #17

              @JonB well, I found the origin of the assert failure

              void MainWindow::performStyles()
              {
                  QString theme = settings->value("app/theme").toString();
                  settings->beginGroup("themes");
                  QStringList colors = settings->value(theme).toString().split(",");
                  settings->endGroup();
                  QString stylesheet = (
                              "QSlider::groove:horizontal {"
                              "border: 1px solid #999999;"
                              "height: 5px;"
                              "background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #B1B1B1, stop:1 #c4c4c4);"
                              "border-radius: 3px;"
                              "}"
                              "QSlider::handle:horizontal {"
                              "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 %3);"
                              "border: 1px solid #5c5c5c;"
                              "width: 16px;"
                              "margin: -2px 0;"
                              "border-radius: 3px;"
                              "}"
                              "QSlider::handle:horizontal:hover {"
                              "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #FFFFFF, stop:1 %3);"
                              "border: 1px solid #808080;"
                              "width: 16px;"
                              "margin: -2px 0;"
                              "border-radius: 3px;"
                              "}"
                              "QSlider::add-page:horizontal {"
                              "background: #c0c0c0;"
                              "border-radius: 3px;"
                              "margin: 0 -1px;"
                              "}"
                              "QSlider::sub-page:horizontal {"
                              "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 %3);"
                              "border-radius: 3px;"
                              "}"
                              "QFrame#data {"
                              "border: 1px solid gray;"
                              "border-radius: 5px;"
                              "background-color: %1;"
                              "}"
                              "QLabel#display {"
                              "font-size: 20px;"
                              "color: %2;"
                              "padding-bottom: 1px;"
                              "background-color: %1;"
                              "}"
                              "QLabel#kbps, QLabel#hz, QLabel#channels  {"
                              "font-size: 10px;"
                              "text-align: center;"
                              "color: %2;"
                              "}"
                              "ScrollText {"
                              "font-size: 14px;"
                              "text-align: center;"
                              "color: %2;"
                              "}"
                              "QTableView {"
                              "border: 1px solid gray;"
                              "border-radius: 5px;"
                              "background-color: %1;"
                              "color: %2;"
                              "}"
                              "QTableView::item:selected {"
                              "border-radius: 3px;"
                              "background-color: %2;"
                              "color: %1;"
                              "}"
                              "QScrollBar#vscrollbar:vertical {"
                              "border: 1px solid grey;"
                              "border-radius: 3px;"
                              "background: %1;"
                              "width: 15px;"
                              "margin: 0px 0 0px 0;"
                              "}"
                              "QScrollBar#vscrollbar::handle:vertical {"
                              "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 %1);"
                              "border: 1px solid #5c5c5c;"
                              "width: 16px;"
                              "min-height: 16px;"
                              "border-radius: 3px;"
                              "}"
                              "QScrollBar#vscrollbar::add-line:vertical {"
                              "border: 0px solid grey;"
                              "background: #32CC99;"
                              "height: 0px;"
                              "subcontrol-position: bottom;"
                              "subcontrol-origin: margin;"
                              "}"
                              "QScrollBar#vscrollbar::sub-line:vertical {"
                              "border: 0px solid grey;"
                              "background: #32CC99;"
                              "height: 0px;"
                              "subcontrol-position: top;"
                              "subcontrol-origin: margin;"
                              "}"
                              "QScrollBar#vscrollbar::add-page:vertical, QScrollBar::sub-page:vertical {"
                              "background: none;"
                              "}"
                              "QListWidget::item:selected {"
                              "background-color: none;"
                              "border: 3px solid grey;"
                              "}"
                              "QListWidget::item:selected { background: transparent; }"
                              "QListWidget::item:selected { border: 1px solid red; }"
                              );
                  this->setStyleSheet(stylesheet.arg(colors.at(0),colors.at(1),colors.at(2)));
              }
              

              This seems to be the line causing the error

              this->setStyleSheet(stylesheet.arg(colors.at(0),colors.at(1),colors.at(2)));
              

              My ini settings file is written like this

              [themes]
              Red="#C21212,#ffffff,#C21212"
              

              I must have misused the QString arg method

              JonBJ 1 Reply Last reply
              0
              • JonBJ JonB

                @LeLev
                In this case he is using main(argc, argv) correctly. The point (to me) is:

                ASSERT failure in QList<T>::at: "index out of range", file C:/Qt/Qt5.14.0/5.14.0/mingw73_32/include/QtCore/qlist.h, line 571
                

                I don't see how that can arise from his argc/argv/std::cout loop. Has to be a QList involved!

                ODБOïO Offline
                ODБOïO Offline
                ODБOï
                wrote on last edited by
                #18

                @JonB yes you are right, my bad.
                i thought about argv[i] as a QList for some reason

                1 Reply Last reply
                0
                • UnitScanU UnitScan

                  @JonB well, I found the origin of the assert failure

                  void MainWindow::performStyles()
                  {
                      QString theme = settings->value("app/theme").toString();
                      settings->beginGroup("themes");
                      QStringList colors = settings->value(theme).toString().split(",");
                      settings->endGroup();
                      QString stylesheet = (
                                  "QSlider::groove:horizontal {"
                                  "border: 1px solid #999999;"
                                  "height: 5px;"
                                  "background: qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 #B1B1B1, stop:1 #c4c4c4);"
                                  "border-radius: 3px;"
                                  "}"
                                  "QSlider::handle:horizontal {"
                                  "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 %3);"
                                  "border: 1px solid #5c5c5c;"
                                  "width: 16px;"
                                  "margin: -2px 0;"
                                  "border-radius: 3px;"
                                  "}"
                                  "QSlider::handle:horizontal:hover {"
                                  "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #FFFFFF, stop:1 %3);"
                                  "border: 1px solid #808080;"
                                  "width: 16px;"
                                  "margin: -2px 0;"
                                  "border-radius: 3px;"
                                  "}"
                                  "QSlider::add-page:horizontal {"
                                  "background: #c0c0c0;"
                                  "border-radius: 3px;"
                                  "margin: 0 -1px;"
                                  "}"
                                  "QSlider::sub-page:horizontal {"
                                  "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 %3);"
                                  "border-radius: 3px;"
                                  "}"
                                  "QFrame#data {"
                                  "border: 1px solid gray;"
                                  "border-radius: 5px;"
                                  "background-color: %1;"
                                  "}"
                                  "QLabel#display {"
                                  "font-size: 20px;"
                                  "color: %2;"
                                  "padding-bottom: 1px;"
                                  "background-color: %1;"
                                  "}"
                                  "QLabel#kbps, QLabel#hz, QLabel#channels  {"
                                  "font-size: 10px;"
                                  "text-align: center;"
                                  "color: %2;"
                                  "}"
                                  "ScrollText {"
                                  "font-size: 14px;"
                                  "text-align: center;"
                                  "color: %2;"
                                  "}"
                                  "QTableView {"
                                  "border: 1px solid gray;"
                                  "border-radius: 5px;"
                                  "background-color: %1;"
                                  "color: %2;"
                                  "}"
                                  "QTableView::item:selected {"
                                  "border-radius: 3px;"
                                  "background-color: %2;"
                                  "color: %1;"
                                  "}"
                                  "QScrollBar#vscrollbar:vertical {"
                                  "border: 1px solid grey;"
                                  "border-radius: 3px;"
                                  "background: %1;"
                                  "width: 15px;"
                                  "margin: 0px 0 0px 0;"
                                  "}"
                                  "QScrollBar#vscrollbar::handle:vertical {"
                                  "background: qlineargradient(x1:0, y1:0, x2:1, y2:1, stop:0 #b4b4b4, stop:1 %1);"
                                  "border: 1px solid #5c5c5c;"
                                  "width: 16px;"
                                  "min-height: 16px;"
                                  "border-radius: 3px;"
                                  "}"
                                  "QScrollBar#vscrollbar::add-line:vertical {"
                                  "border: 0px solid grey;"
                                  "background: #32CC99;"
                                  "height: 0px;"
                                  "subcontrol-position: bottom;"
                                  "subcontrol-origin: margin;"
                                  "}"
                                  "QScrollBar#vscrollbar::sub-line:vertical {"
                                  "border: 0px solid grey;"
                                  "background: #32CC99;"
                                  "height: 0px;"
                                  "subcontrol-position: top;"
                                  "subcontrol-origin: margin;"
                                  "}"
                                  "QScrollBar#vscrollbar::add-page:vertical, QScrollBar::sub-page:vertical {"
                                  "background: none;"
                                  "}"
                                  "QListWidget::item:selected {"
                                  "background-color: none;"
                                  "border: 3px solid grey;"
                                  "}"
                                  "QListWidget::item:selected { background: transparent; }"
                                  "QListWidget::item:selected { border: 1px solid red; }"
                                  );
                      this->setStyleSheet(stylesheet.arg(colors.at(0),colors.at(1),colors.at(2)));
                  }
                  

                  This seems to be the line causing the error

                  this->setStyleSheet(stylesheet.arg(colors.at(0),colors.at(1),colors.at(2)));
                  

                  My ini settings file is written like this

                  [themes]
                  Red="#C21212,#ffffff,#C21212"
                  

                  I must have misused the QString arg method

                  JonBJ Offline
                  JonBJ Offline
                  JonB
                  wrote on last edited by JonB
                  #19

                  @UnitScan
                  Your colors.at() expressions are fine so long as

                  QStringList colors = settings->value(theme).toString().split(",");
                  

                  really does returns 3 colors. My guess is that, depending on how you run the program --- e.g do you read from "the current working directory"? or, what is qDebug() << theme, or qDebug() << settings->value(theme).toString()? --- you're not picking up the right thing? Code like yours which relies on 3 elements from the split() should have a Q_ASSERT(colors.count() == 3);. Anyway, somehow that differs when you run your code in different ways.

                  I hope now that you have found using the debugger helps find such errors!

                  1 Reply Last reply
                  3
                  • UnitScanU Offline
                    UnitScanU Offline
                    UnitScan
                    wrote on last edited by
                    #20

                    I suppose the problem is bigger: when I run the program via cmd it doesn't even load the icons: https://i.imgur.com/yqvpYnl.png

                    1 Reply Last reply
                    0
                    • sierdzioS Offline
                      sierdzioS Offline
                      sierdzio
                      Moderators
                      wrote on last edited by
                      #21

                      as @JonB pointed out, this is probably related to working directory. Make sure you load your settings from the right path! This might come in handy: https://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath

                      (Z(:^

                      UnitScanU 1 Reply Last reply
                      4
                      • sierdzioS sierdzio

                        as @JonB pointed out, this is probably related to working directory. Make sure you load your settings from the right path! This might come in handy: https://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath

                        UnitScanU Offline
                        UnitScanU Offline
                        UnitScan
                        wrote on last edited by
                        #22

                        @sierdzio said in Open file via double-click:

                        as @JonB pointed out, this is probably related to working directory. Make sure you load your settings from the right path! This might come in handy: https://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath

                        Thank you very much!

                        1 Reply Last reply
                        0

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