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Excel::WorkbookPtr m_ptrDummyWbk;
Excel::WorkbooksPtr ptr_XLWb = m_myExcelPtr->GetWorkbooks();
m_ptrDummyWbk = ptr_XLWb->Add();
m_ptrDummyWbk->PutIsAddin(VARIANT_TRUE);
m_ptrDummyWbk->PutSaved(0,VARIANT_TRUE);

m_ptrDummyWbk->PutSaved(0,VARIANT_TRUE);
HRESULT hr = m_ptrDummyWbk->Close(VARIANT_FALSE);
m_ptrDummyWbk = NULL
ptr_XLWb = NULL;

m_ptrDummyWbk = ptr_XLWb->Add();

Quote:

Unhandled exception at 0x2f430f9f in EXCEL.EXE: 0xC0000005: Access violation reading location 0x0b0231b8.