DNS Component [IP*Works! V8]
Properties
Methods
Events
Configuration Settings
The DNS component is used to query DNS for record information.
NOTE: What follows is a very short description of the component interfaces.
For more information, please consult the help files that come with the respective package.
Remarks
The DNS component queries a DNS server for records as specified in RFC
1035 and other relevant RFCs. The component property QueryType
indicates the record to be queried. Calling Query will
initiate the query.
Once the query is complete, a single Response event
will fire and the record properties will be filled. StatusCode
is the server's success or fail code, and Status is a standard
string interpretation of the code.
The records are contained in the Records properties
. The programming
interface is designed to
allow a full walk of the records in the DNS response, including provisions for
handling new record types.
The component operates synchronously by default (waits for a response before
returning control to the caller), however, the component may also operate
asynchronously (return control immediately), by setting Timeout to 0.
Please refer to the Timeout property for more information.
Property List
The following is the full list of the properties of the component with short
descriptions. Click on the links for further details.
| |
| DNSPort | The port to connect to on the DNS Server. |
| DNSServer | The address of the DNS server. |
| Idle | The current status of the component. |
| LocalHost | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
| QueryType | The record type to query. |
| RecordCount | The number of records in the Record arrays. |
| RecordDomain | This property contains the domain name associated with the selected response record, at RecordIndex. |
| RecordFieldCount | This property contains the number of properties in the current record. |
| RecordFieldIndex | This property contains the index of the selected property of the current record. |
| RecordFieldName | This property contains the name of the property selected by FieldIndex . |
| RecordFieldValue | This property contains the value of the property selected by FieldIndex . |
| RecordData | This property contains the full record data as received from the DNS server. |
| RecordType | This property contains the record type. |
| RecordTypeName | This property contains the string representation of the current record type defined by RecordType . |
| RecordTTL | This property contains the record Time To Live (TTL) value. |
| RecordSource | The source of records provided in the Records properties. |
| Recursive | Determines whether to ask the DNSServer to recursively query other servers. |
| RequestId | The ID of the current DNS request. |
| Status | A standard string interpretation of StatusCode. |
| StatusCode | The success or error code for the DNS query. |
| Timeout | A timeout for the component. |
Method List
The following is the full list of the methods of the component with short
descriptions. Click on the links for further details.
| |
| Config | Sets or retrieves a configuration setting. |
| DoEvents | Processes events from the internal message queue. |
| GetFieldValue | Get the value of the field indicated from a record. |
| Interrupt | Interrupt the current method. |
| Query | Query a Domain. |
Event List
The following is the full list of the events fired by the component with short
descriptions. Click on the links for further details.
| |
| Error | Information about errors during data delivery. |
| Response | Fires after a DNS query. |
Configuration Settings
The following is a list of configuration settings for the component with short
descriptions. Click on the links for further details.
| |
| MaxPacketSize | The maximum length of the packets that can be received. |
| ShareLocalPort | If set to True, allows more than one instance of the component to be active on the same local port. |
| UseConnection | Determines whether to use a connected socket. |
| QOSTrafficType | Used to specify QOS/DSCP settings (optional). |
| UseIPv6 | Whether or not to use IPv6. |
| AbsoluteTimeout | Determines whether timeouts are inactivity timeouts or absolute timeouts. |
| FirewallData | Used to send extra data to the firewall. |
| InBufferSize | The size in bytes of the incoming queue of the socket. |
| OutBufferSize | The size in bytes of the outgoing queue of the socket. |
| CodePage | The system code page used for Unicode to Multibyte translations. |
