Retrieves data from a moniker that can be used to test the moniker for
equality against another moniker.
| PVOID *ppvData,
||//Buffer that receives the comparison data
| ULONG cbMax,
||//Specifies length of buffer
| PULONG pcbData
||//Receives the length of the comparison data
[out] Points to a buffer that receives the comparison data.
[in] Specifies the length of the buffer specified in ppvData
[out] Receives the length of the comparison data.
The comparison data was successfully returned.
The buffer contained insufficient space to return the comparison data.
method is primarily called by the Running Object Table (ROT). The comparison
data returned by the method is tested for binary equality against the
comparison data returned by another moniker. The pcbData
parameter enables the ROT to locate the end of the data returned.
Notes to Implementors
The comparison data that you return must uniquely identify the moniker, while
still being as short as possible. The comparison data should include
information about the internal state of the moniker, as well as the moniker's CLSID. For
example, the comparison data for a file moniker would include the pathname
stored within the moniker as well as the CLSID of the file moniker implementation.
This makes it possible to distinguish two monikers that happen to store similar
state information but are instances of different moniker classes.
The comparison data for a moniker cannot exceed 2048 bytes in length. For
composite monikers, the total length of the comparison data for all of its
components cannot exceed 2048 bytes; consequently, if your moniker can be a component
within a composite moniker, the comparison data you return must be significantly
less than 2048 bytes.
If your comparison data is longer than the value specified by the cbMax
parameter, you must return an error. Note that when IROTData::GetComparisionData
is called on the components of a composite moniker, the value of cbMax
becomes smaller for each moniker in sequence.
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