IMSProvider::CompareStoreIDs

The IMSProvider::CompareStoreIDs method compares two message store entry identifiers to determine if they refer to the same store object.

Quick Info

See IMSProvider : IUnknown.

HRESULT CompareStoreIDs(
  ULONG cbEntryID1,       
  LPENTRYID lpEntryID1,   
  ULONG cbEntryID2,       
  LPENTRYID lpEntryID2,   
  ULONG ulFlags,          
  ULONG FAR * lpulResult  
);

Parameters

cbEntryID1: [in] Size, in bytes, of the entry identifier pointed to by the lpEntryID1 parameter.
lpEntryID1: [in] Pointer to the first entry identifier to be compared.
cbEntryID2: [in] Size, in bytes, of the entry identifier pointed to by the lpEntryID2 parameter.
lpEntryID2: [in] Pointer to the second entry identifier to be compared.
ulFlags: Reserved; must be zero.
lpulResult: [out] Pointer to the returned result of the comparison; this variable is TRUE if the two entry identifiers refer to the same object, and FALSE otherwise.

Return Value

S_OK: The call succeeded and has returned the expected value or values.

Remarks

MAPI calls the IMSProvider::CompareStoreIDs method while processing a call to the IMAPISession::OpenMsgStore method. CompareStoreIDs is called at this point to determine which profile section, if any, is associated with the message store being opened. A CompareStoreIDs call can be made when no message stores are open for a particular store provider. In addition, MAPI also calls CompareStoreIDs while processing a store provider call to the IMAPISupport::OpenProfileSection method.

The entry identifiers compared by CompareStoreIDs are both for the current store provider's dynamic-link library (DLL) and are both unwrapped store entry identifiers. For more information on wrapping store entry identifiers, see IMAPISupport::WrapStoreEntryID.

Comparing entry identifiers is useful because an object can have more than one valid entry identifier; such a situation can occur, for example, after a new version of a message store provider is installed.