ActiveQt + Excel

[nile.one]

I'm trying to convert Excel file to DBF. So i'm using ActiveQt FrameWork.
So i generated Excel namespace by using dumpcpp tool.
First of all i wanted to get list of the Worksheets.
The application is getting access violation in the row #10:
QString sheetname = sheet->Name();
I think the problem is that i incorrectly get the Excel::Worksheet object.

Does anybody know how to solve this problem?

The source code is shown below

Excel::Application* excel = new Excel::Application;
	Excel::Workbooks* wbks = excel->Workbooks();	
	Excel::Workbook* wbk = wbks->Open(exchange->getFilename());
	Excel::Sheets* sheets = wbk->Worksheets();
	int count = sheets->Count();
	QStringList sheetsList;
	for (int i=1; i<=count; i++)
	{
		Excel::Worksheet* sheet = (Excel::Worksheet*) sheets->Item(i);
		QString sheetname = sheet->Name();
		sheetsList.append(sheetname);		
	}
	wbk->Close();
	excel->Quit();

Excel::Application* excel = new Excel::Application;
	Excel::Workbooks* wbks = excel->Workbooks();	
	Excel::Workbook* wbk = wbks->Open(exchange->getFilename());
	Excel::Sheets* sheets = wbk->Worksheets();
	int count = sheets->Count();
	QStringList sheetsList;
	for (int i=1; i<=count; i++)
	{
		Excel::Worksheet* sheet = (Excel::Worksheet*) sheets->Item(i);
		QString sheetname = sheet->Name();
		sheetsList.append(sheetname);		
	}
	wbk->Close();
	excel->Quit();

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Thanks.