Qwt crash in Vista

[roland8454]

I've encountered a problem with Qwt in Visual Studio 2005 under Vista. Qwt was compiled with VS 2005.

The crash occurs when I close the program I wrote. And the debugger reports heap corruption. However the same program works just fine under Windows XP. I checked the call stack the last call before the crash was from qwtd5.dll. After I remove all Qwt code, it works just fine.

I compiled both debug and release versions of Qwt using the file in "admin\msvc-qmake.bat".

Anybody else having this problem? Attached are screenshots of the debugger info. Thank you all in advance.

[wysota]

There is a 99% chance the problem is with your code that calls Qwt. With XP you are lucky and hit a zero value and in Vista there is a non-null value there which you try to dereference or something like that. Take a debugger and debug your application to see where exactly the problem occurs.

[roland8454]

Thank you, I will give it a try.

[roland8454]

OK, I started a brand new project and added nothing but a QwtPlot in the application window. Still the program crashes while closing and reports heap corruption. Below is the code I used:

GUI::GUI(QWidget *parent, Qt::WFlags flags)
            : QMainWindow(parent, flags){
 
    this->resize(1010,950);
    QApplication::setStyle(QStyleFactory::create("Cleanlooks"));
 
    viewtabs = new QTabWidget();
 
    // Plot
    dataPlot = new QwtPlot();
    curve = new QwtPlotCurve("Curve");
    curve->attach(dataPlot);
 
    viewtabs->addTab(dataPlot, "Plot");
    setCentralWidget(viewtabs);
 
}

GUI::GUI(QWidget *parent, Qt::WFlags flags)
            : QMainWindow(parent, flags){

    this->resize(1010,950);
    QApplication::setStyle(QStyleFactory::create("Cleanlooks"));
    
    viewtabs = new QTabWidget();

    // Plot
    dataPlot = new QwtPlot();
    curve = new QwtPlotCurve("Curve");
    curve->attach(dataPlot);

    viewtabs->addTab(dataPlot, "Plot");
    setCentralWidget(viewtabs);

}

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I noticed whenever I commented out "curve->attach(dataPlot);", the program does not crash. Did I initialize the curve wrong? Also I forgot to mention earlier I am using Vista Ultimate 64 bit, while the application and Qwt were compiled with 32 bit mode.

If you happen to have Qwt compiled under Vista, can you please send me the debug and release LIB and DLL files so I can test them?

Thanks.