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Oggetto del flusso di ADO


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L'oggetto del flusso dell'oggetto di dati di Activex (ADO) fornisce l'accesso ad un flusso dei dati del testo o dei dati binari. Tramite accesso, significhiamo la capacità di scrivere, leggiamo e controlliamo il flusso.




Una zona di amplificatore da cui il contenuto del flusso può essere letto. La natura del contenuto di un flusso potrebbe essere testo o tipo binario di informazioni, anche se la documentazione di Microsoft accenna appena il divisorio binario.


Possiamo abbiamo ottenuto un oggetto del flusso da tre sensi:

1. Da un URL che indica ad un oggetto che contiene i dati del testo o i dati binari. Questo oggetto può essere un documento semplice, un oggetto record che rappresenta un documento strutturato, o un dispositivo di piegatura.


2. Aprendo il flusso di ADO di difetto obiettare collegato con un oggetto record. Potete ottenere il flusso di difetto connesso con l'oggetto record quando l'annotazione è aperta, per eliminare appena un di andata e ritorno per aprire il flusso.


3. Instantiating un oggetto del flusso di ADO. Questi oggetti del flusso possono essere usati per memorizzare le annotazioni o i dati per gli scopi della nostra applicazione. Diverso di un flusso connesso con il URL, o del flusso di difetto delle annotazioni, instantiated il flusso non ha associazione con una fonte di fondo per difetto.




Usare l'oggetto del flusso di ADO per accedere al flusso dell'articolo.

Per esempio:

Dim Stm As ADODB.Stream
Dim Rec as New ADODB.Record
Dim Conn as New ADODB.Connection
Dim Stm2 as New ADODB.Stream
Dim Url As String

Url = "http://server/public/dataitem.txt"

Conn.Provider = "ExOLEDB.DataSource"
Conn.Open Url
Rec.Open Url, Conn
Set Stm = Rec.Fields(adDefaultStream).Value
' Or, alternately
Stm2.Open Rec, adModeRead, adOpenStreamFromRecord

'...
Conn.Close
Rec.Close
Stm.Close
Stm2.Close
Set Conn = Nothing
Set Rec = Nothing
Set Stm = Nothing
Set Stm2 = Nothing


Proprietà dell'oggetto di Stram di ADO.

Property Description
CharSet

Sets or returns a value that specifies into which character set the contents are to be translated. This property is only used with text Stream objects (type is adTypeText)

EOS

Returns whether the current position is at the end of the stream or not

LineSeparator

Sets or returns the line separator character used in a text Stream object

Mode

Sets or returns the available permissions for modifying data

Position

Sets or returns the current position (in bytes) from the beginning of a Stream object

Size

Returns the size of an open Stream object

State

Returns a value describing if the Stream object is open or closed

Type

Sets or returns the type of data in a Stream object


Metodi dell'oggetto di Stram di ADO.

Methods Description
Cancel Cancels an execution of an Open call on a Stream object
Close Closes a Stream object
CopyTo

Copies a specified number of characters/bytes from one Stream object into another Stream object

Flush

Sends the contents of the Stream buffer to the associated underlying object

LoadFromFile Loads the contents of a file into a Stream object
Open Opens a Stream object
Read

Reads the entire stream or a specified number of bytes from a binary Stream object

ReadText

Reads the entire stream, a line, or a specified number of characters from a text Stream object

SaveToFile Saves the binary contents of a Stream object to a file
SetEOS

Sets the current position to be the end of the stream (EOS)

SkipLine Skips a line when reading a text Stream
Write Writes binary data to a binary Stream object
WriteText Writes character data to a text Stream object




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Keywords:ADO Stream Object, adodb stream object, visual basic object, visual basic ado, ado asp net, ado sql server


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