CVssWriter::OnThaw method (vswriter.h)
The OnThaw method is called by a writer following a Thaw event.
OnThaw is a pure virtual method. It is not implemented by the CVssWriter base class, and must be implemented by derived classes.
The implementation of this method must return true except in the case of a fatal error. If a fatal error occurs, the method must call the CVssWriter::SetWriterFailure method to provide a description of the failure before returning false. If a nonfatal error occurs, the method should still call SetWriterFailure but return true. If the error is caused by a transient problem, the method should specify VSS_E_WRITERERROR_RETRYABLE in the call to SetWriterFailure.
In all cases when a failure occurs, the method should write an event to the event log to report the exact reason for the failure.
This method is called at the end of a shadow copy freeze when writers can begin to modify data on disk again.
Final updates by the writer to the backup components metadata and cleanup (such as removing temporary files) are typically reserved for CVssWriter::OnPostSnapshot.
Writers should never throw an exception from this method or any other CVssWriter(Ex)::OnXxx callback method.
If this method calls the CVssWriterEx2::GetSessionId, CVssWriter::SetWriterFailure, or CVssWriterEx2::SetWriterFailureEx method, it must do so in the same thread that called this method. For more information, see Writer Event Handling.
|Minimum supported client||Windows XP [desktop apps only]|
|Minimum supported server||Windows Server 2003 [desktop apps only]|
|Header||vswriter.h (include Vss.h, VsWriter.h)|