كائن دفق ADO
كائن دفق (ADO الإصدار 2.5)
يتم استخدام كائن دفق ADO لقراءة دفق من البيانات الثنائية أو النص وكتابته وإدارته.
يمكن الحصول على كائن Stream بثلاث طرق:
- من عنوان URL يشير إلى مستند أو مجلد أو كائن سجل
- من خلال إنشاء مثيل لكائن Stream لتخزين البيانات لتطبيقك
- بفتح كائن التدفق الافتراضي المرتبط بكائن السجل
بناء الجملة
objectname.property
objectname.method
الخصائص
| 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 |
طرق
| Method | 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 |