Fires after the OS marks a file or directory for deletion or removes such a mark.
type TAfterCanFileBeDeletedEvent = procedure ( Sender: TObject; const FileName: String; CanDelete: Boolean; var Status: Integer; var FileContext: Pointer; var HandleContext: Pointer; var ResultCode: Integer ) of Object;
property OnAfterCanFileBeDeleted: TAfterCanFileBeDeletedEvent read FOnAfterCanFileBeDeleted write FOnAfterCanFileBeDeleted;
This event fires after the OS marks the file or directory specified by FileName for deletion or removes such a mark. If the file or directory is marked for deletion, they will be actually removed not immediately but when the last handle is closed. Moreover, it is possible that a future call to a system function will remove the mark, so this event is not a final indicator that the file or directory will be deleted.
Files and directories can be deleted in two ways: a file or directory can be opened with the FILE_FLAG_DELETE_ON_CLOSE flag, or some process may call Windows API's NtSetInformationFile function with FILE_DISPOSITION_INFORMATION or FILE_DISPOSITION_INFORMATION_EX structure as a parameter.
The CanDelete parameter reflects whether the file or directory will be deleted.
The Status parameter contains an NT status code that indicates the outcome of the operation; 0 indicates success. To convert this value to a Win32 error code, call the NtStatusToWin32Error method. Please note that this event won't fire for failed requests unless the ProcessFailedRequests property is enabled. Applications may change this parameter's value if they want a different NT status code to be returned.
The FileContext and HandleContext parameters are placeholders for application-defined data associated with the file and specific handle, respectively. Please refer to the Contexts topic for more information.
The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource isn't available, security checks failed, etc.), set it to a non-zero value to report an appropriate error. Please refer to the Error Reporting and Handling topic for more information.
This event is fired synchronously; please refer to the Event Types topic for more information.