Run-Time Check Failure #0 in C++/ATL Add-In accessing MailItem Subject

[DarkJem]

Hi,

I'm trying to write my Add-In for Outlook in C++/ATL and I encounter
some problems when trying to access the subject of a _MailItem.

Here is my code in addin.cpp

void __stdcall CAddin::OnSelectionChange()
{
// Retrieving the current folder
CComPtr<Outlook::MAPIFolder> curFolder;

// spExplorer is a global variable where I store the Explorer object
spExplorer->get_CurrentFolder(&curFolder);


// retrieving the current selection
CComPtr<Outlook::Selection> mySelection;
HRESULT hr = spExplorer->get_Selection(&mySelection);
if ( FAILED( hr ) ) return;

long count = 0;
hr = mySelection->get_Count(&count);
if ( FAILED( hr ) ) return;

// loop through the selected mails.
for ( int i = 1; i <= count; ++i )
{
CComVariant index( i );

// get the selected mail
CComPtr<Outlook::_MailItem> spItem;
hr = mySelection->Item( index, (IDispatch**) &spItem ); if (
FAILED( hr ) ) return;

// Check if item really is an email object.
OlObjectClass cls;
hr = spItem->get_Class( &cls );
if ( FAILED( hr ) ) return;

if ( cls == Outlook:lMail )
{

CComBSTR spSubject;
HRESULT hr = spItem->get_Subject(&spSubject);
// Here I get the following error message :
// Run-Time Check Failure #0 - The value of
ESP was not properly saved across a function call. This is usually a
result of calling a function declared with one calling convention with
a function pointer declared with a different calling convention

if ( FAILED( hr ) ) return;

// do some stuff with the mail
}
}
}


I really don't know how to overcome this issue. I did'nt find any work
around for this specific problem anywhere.
I'm not very familiar with outlook programming so any help would be
very welcome!!

Thanks
Regards

Jeremie