[Qt-interest] crash in qapplication_win.cpp

[Matthias Pospiech]

This is the trace:

0    ntdll!RtlAppendStringToString    C:\WINDOWS\system32\ntdll.dll   
 0    0x7c9202f6    
1    qt_set_windows_font_resources    qapplication_win.cpp    591   
 0x006d0061    
2    KERNEL32!GetEnvironmentVariableA   
 C:\WINDOWS\system32\kernel32.dll    0    0x7c814ec1    
3    CSumixCam::Shutdown    SMX150.h    452    0x6caddead    
4    ~CSumixCam    SMX150.h    339    0x6caddf22    
5    ~QCameraSMXPrivate    QCameraSMX150.cpp    28    0x6cad4c91    
6    ~QCameraSMX    QCameraSMX150.cpp    86    0x6cac1d04    
7    ~GlobalDevices    globaldevices.cpp    13    0x004022e7    
8    ~MainWindow    mainwindow.cpp    17    0x0040172d    
9    main    main.cpp    9    0x00401419    

I have a device (camera) which is defined as a global pointer

-- globaldevices.cpp -->
#include "globaldevices.h"
#include "QCameraSMX.h"

QCameraSMX* cameraSMX;

GlobalDevices::GlobalDevices()
{
    cameraSMX = 0;
}

GlobalDevices::~GlobalDevices()
{
    delete cameraSMX; cameraSMX = 0;
}
<-------------

GlobalDevices has an instance in MainWindow to ensure that all devices get
deleted during shutdown. So as expected the destructor is called during 
destruction of MainWindow.
This however leads to this crash in qapplication_win.cpp at last line of:

static void qt_set_windows_font_resources()
{
#ifndef Q_WS_WINCE
    NONCLIENTMETRICS ncm;
    ncm.cbSize = FIELD_OFFSET(NONCLIENTMETRICS, lfMessageFont) + 
sizeof(LOGFONT);
    SystemParametersInfo(SPI_GETNONCLIENTMETRICS, ncm.cbSize , &ncm, 0);

What does that mean? What should I do different?

Matthias