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  1. #1
    Registered User
    Join Date
    Jul 2007
    Posts
    13

    Unhappy Unhandled exception while executing project

    Hi all!

    I have just started developing in QT language but i've got some experience with basic, c++ and some other object oriented languages. I tried some developing with Qdevelop on Ubuntu and all seems works fine but i would like to learn QT for windows developing because, for job reasion, sometimes i need to create windows program.
    I decided to install QT on Windows 7 32bit and use visual studio as develop suite. Now all it's working and the program just run fine.
    I have written some line of code to try it and, after searching on the net, i've created a small UI with a button and connected the signal Clicked() to a Qmessagebox.
    The problems starts here...
    I can compile my program without any error or warning and when i start the debug or release process it seems all ok till i get an error:

    "Unhandled exception at 0x671d3226 (QtCored4.dll) in TestQT.exe: 0xC0000005: Access violation reading location 0xcdcdcd00."

    I realized that this happen only when i try to connect the clicked() signal with my function to display the messagebox. I post the source code and hope someone of you can help me!

    Thank you very much,
    Michele

    TESTQT.H
    Code:
    #ifndef TESTQT_H
    #define TESTQT_H
    
    #include <QtGui/QMainWindow>
    #include "ui_testqt.h"
    #include <QMessageBox>
    
    class TestQT : public QMainWindow, private Ui::TestQTClass
    {
    	Q_OBJECT
    
    public:
    	TestQT(QWidget *parent = 0, Qt::WFlags flags = 0);
    	~TestQT();
    
    private slots:
    	void Qclick();
    	
    
    private:
    	Ui::TestQTClass ui;
    	
    };
    
    #endif // TESTQT_H
    MAIN.CPP
    Code:
    #include "testqt.h"
    #include <QtGui/QApplication>
    
    int main(int argc, char *argv[])
    {
    	QApplication a(argc, argv);
    	TestQT w;
    	w.show();
    	
    
    	
    
    
    	return a.exec();
    }
    TESTQT.CPP

    Code:
    #include "testqt.h"
    
    TestQT::TestQT(QWidget *parent, Qt::WFlags flags)
    	: QMainWindow(parent, flags)
    {
    	ui.setupUi(this);
    	/*QPushButton *button = Bottone new QPushButton(*/
        /*QApplication::translate("childwidget", "Press me"), this);
        button->move(100, 100);
        button->show();*/
    	QObject::connect(Bottone,SIGNAL(clicked()),this,SLOT(Qclick()));
    }
    
    TestQT::~TestQT()
    {
    	
    }
    
    void TestQT::Qclick()
    {
    	QMessageBox::information(this,"Titolo","Linkato!!!");
    }

  2. #2
    Super Contributor
    Join Date
    Oct 2009
    Posts
    4,326

    Re: Unhandled exception while executing project

    It's not possible to identify the problem as you didn't attach ui_testqt.h and ui_testqt.cpp.
    You do very strange things in testqt.h and testqt.cpp, so I expect you did something really wrong in TestQTClass::setupUi(...).

    This is sample application, which just connects one button to the slot:
    http://www.mediafire.com/file/jthy3y...michele.tar.gz

  3. #3
    Regular Contributor
    Join Date
    Mar 2009
    Posts
    430

    Re: Unhandled exception while executing project

    Adding these files will not help so much because they are auto-generated. But the commented part of your posting is not valid C++ code and thus will never pass the compiler.

  4. #4
    Super Contributor
    Join Date
    Oct 2009
    Posts
    4,326

    Re: Unhandled exception while executing project

    Quote Originally Posted by axeljaeger View Post
    Adding these files will not help so much because they are auto-generated. But the commented part of your posting is not valid C++ code and thus will never pass the compiler.
    If they autogenerated, then it would be nice to have the files, from which they are autogenerated. I guess is this .ui file? In other words the whole project one can try to build and execute oneself to reproduce the problem. Partial source posting causes a lot of guessing.

  5. #5
    Regular Contributor
    Join Date
    Mar 2009
    Posts
    430

    Re: Unhandled exception while executing project

    RIght, the complete compilable project would be nice.

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