E_OUTOFMEMORY, Heap corruption

Question

What is wrong with this code:

    HRESULT AllocateAndFillOutParameters(DWORD * a_Attrib_Count, BSTR ** a_AttribName, DWORD** a_AttribId,BSTR** a_AttribDescription, BSTR** a_AttribDataType, 
    BSTR** a_AttribAdvanceDataType,DWORD** a_attribfieldlength, VECTOROFATTRIBUTESSTRUCT a_vectAttributes )
{
 HRESULT hr = S_OK;
 VECTOROFATTRIBUTESSTRUCT::iterator itr_vectCategory = a_vectAttributes.begin();

    // Memory Allocation 
     *a_Attrib_Count = a_vectAttributes.size();
    *a_AttribName = (BSTR*)CoTaskMemAlloc(*a_Attrib_Count * sizeof(BSTR));
    *a_AttribDescription = (BSTR*)CoTaskMemAlloc(*a_Attrib_Count * sizeof(BSTR));
    *a_AttribId = (DWORD*)CoTaskMemAlloc(*a_Attrib_Count * sizeof(DWORD));
    *a_AttribDataType = (BSTR*)CoTaskMemAlloc(*a_Attrib_Count * sizeof(BSTR));
    *a_AttribAdvanceDataType = (BSTR*)CoTaskMemAlloc(*a_Attrib_Count * sizeof(BSTR));
     *a_attribfieldlength = (DWORD*)CoTaskMemAlloc(*a_Attrib_Count * sizeof(DWORD));
    //

    for(int i=0 ;itr_vectCategory != a_vectAttributes.end(); itr_vectCategory++, i++)
    {
        *((*a_AttribName)+i) = SysAllocString(itr_vectCategory->m_strAttributeName.c_str());
        *((*a_AttribId)+i) = itr_vectCategory->m_dwAttributeId;
        *((*a_AttribDescription)+i) = SysAllocString(itr_vectCategory->m_strAttributeDescription.c_str());
        *((*a_AttribDataType)+i) = SysAllocString(itr_vectCategory->m_strAttributeDataType.c_str());
        *((*a_AttribAdvanceDataType)+i) = SysAllocString(itr_vectCategory->m_strAttributeAdvanceDataType.c_str());
        *((*a_attribfieldlength)+i) = (itr_vectCategory->m_dwAttributeFieldLength);

    }

 return hr;
}

It gives runtime exception of heap corruption , am i allocating in wrong way ? Thanks for help.

Answer 1

I can't tell you where your error is, but I would suggest downloading the Debugging Tools for Windows and then reading the docs on enabling Page Heap debugging using the gflags program which may allow you to catch the error where the heap corruption actually occurs.