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10/05/2009 at 03:48PM PDT, ID: 24787298
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7.0

How to fail gracefully Outlook COM

Asked by purplepomegranite in C++ Programming Language, Windows ATL / WTL / COM Programming

Tags: Outlook MAPI COM

I have a COM written to be used in conjunction with a VB Outlook add-in.  One problem I would like to resolve is to properly handle invalid parameters being passed to the add-in.  For example, one function is as below.  This function takes a MAPIFolder and returns an array containing information about the folder (i.e. all subfolders, recursed).

The problem occurs when an invalid object is passed as a parameter (e.g. the folder object is VB Nothing, or unset).  This currently causes a GPF.  While I have made all possible checks in the VB code before calling this routine, I would rather the C++ function failed gracefully.

So... How do I check for a valid object so that I can simply return immediately if not supplied?
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STDMETHODIMP CPMapiWrapper::EnumerateFolders(VARIANT pFolderItem,  VARIANT *pFolderList,  VARIANT *result)
{
	SAFEARRAY* arr = NULL;
	LPUNKNOWN unk = NULL;
 
	if (pFolderItem.vt == (VT_DISPATCH | VT_BYREF)) unk = getMapiobjectProperty(*(pFolderItem.ppdispVal));
	else if (pFolderItem.vt == (VT_DISPATCH)) unk = getMapiobjectProperty(pFolderItem.pdispVal);
	else return E_INVALIDARG;
	if (!unk) return E_NOINTERFACE;
 
	if (V_ISARRAY(pFolderList))
 	{
 	   // Check dimensions of the array.
 	   arr = V_ISBYREF(pFolderList)? *V_ARRAYREF(pFolderList): V_ARRAY(pFolderList);
       if (SafeArrayGetDim(arr) != 2) return E_INVALIDARG;
 	}
 
	if (!arr) 
	{
		return E_NOINTERFACE;
	}
 
	HRESULT hr = enumerateFolders(unk, arr, result);
	unk->Release();
 
	return hr;
}
[+][-]10/06/09 03:15 AM, ID: 25503380

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[+][-]10/06/09 11:18 PM, ID: 25512570

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About this solution

Zones: C++ Programming Language, Windows ATL / WTL / COM Programming
Tags: Outlook MAPI COM
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Solution Provided By: purplepomegranite
Participating Experts: 1
Solution Grade: A
 
 
[+][-]10/07/09 05:14 AM, ID: 25514484

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