[in] A handle to the error value generated in the previous method call.
[in] A bitmask of flags that controls the type of the strings returned. The following flag can be set:
The strings in the MAPIERROR structure returned in the lppMAPIError parameter are in Unicode format. If the MAPI_UNICODE flag is not set, the strings are in ANSI format.
[out] A pointer to a pointer to a MAPIERROR structure that contains version, component, and context information for the error. The lppMAPIError parameter can be set to NULL if the provider cannot supply a MAPIERROR structure with appropriate information.
Service providers implement the IMAPIControl::GetLastError method to supply information about a prior method call that failed. MAPI can give users detailed information about the error by displaying the data from the MAPIERROR structure in a message or dialog box.
You do not need to have information to include in the MAPIERROR structure for every error. It may not be possible to determine what the previous error was. If you have information, return S_OK and the appropriate data in the MAPIERROR structure. If no information is available, return S_OK and a pointer to NULL for the lppMAPIError parameter.