IDictionary::get_Prefix, put_Prefix
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The Prefix property is a read/write String that acts as a filter when the contents of the Dictionary object are saved (usually to a database). When the name of a name/value pair begins with the specified prefix, that name/value pair is not saved. By default, the prefix is "_", so that any keywords beginning with an underscore character are excluded.
Definition
Get method:
HRESULT IDictionary::get_Prefix(BSTR*Prefix);
Put method:
HRESULT IDictionary::put_Prefix(BSTRPrefix);
Parameters
Prefix
[in] When putting the property, a BSTR that contains the prefix.
[out, retval] When getting the property, a pointer to the BSTR that contains the prefix.
Return Values
These methods return an HRESULT indicating whether they completed successfully. See the Error Values section for more details.
Error Values
These methods return S_OK (0x00000000) to indicate success and standard COM HRESULT error values to indicate failure. For more information about standard COM errors, see Standard COM Errors. Additional information may be available using the global Err object, which can be accessed using the API function GetErrorInfo. In particular, the GetDescription method of the IErrorInfo interface may return a text description of the error.
Remarks
The Prefix parameter contains valid data only if the property is accessed successfully.
For more information about memory ownership issues related to COM property and method parameters, see Managing COM Parameter Memory.
By default, the prefix is "_", so that any keywords beginning with an underscore character are excluded.
The pipeline component that saves receipts usually sets the prefix to "_cc_", so that all credit-card information is not saved in the database. The actual string used by the pipeline component is configurable.