4D v20.1
SET BLOB SIZE
- 4D Language Reference
-
- BLOB
-
- BLOB PROPERTIES
- BLOB size
- BLOB TO DOCUMENT
- BLOB to integer
- BLOB to list
- BLOB to longint
- BLOB to real
- BLOB to text
- BLOB TO VARIABLE
- COMPRESS BLOB
- COPY BLOB
- DECRYPT BLOB
- DELETE FROM BLOB
- DOCUMENT TO BLOB
- ENCRYPT BLOB
- EXPAND BLOB
- INSERT IN BLOB
- INTEGER TO BLOB
- LIST TO BLOB
- LONGINT TO BLOB
- REAL TO BLOB
- SET BLOB SIZE
- TEXT TO BLOB
- VARIABLE TO BLOB
SET BLOB SIZE
| SET BLOB SIZE ( blob ; size {; filler} ) | ||||||||
| Parameter | Type | Description | ||||||
| blob | BLOB |
|
BLOB field or variable | |||||
| size | Longint |
|
New size of the BLOB | |||||
| filler | Longint |
|
ASCII code of filler character | |||||
SET BLOB SIZE resizes the BLOB blob according to the value passed in size.
If you want to allocate new bytes to a BLOB and want to have those bytes initialized to a specific value, pass the value (0..255) into the filler optional parameter.
Compatiblity note: Since this command alters the blob passed as a parameter, it does not support blob objects (4D.Blob type). See Passing blobs and blob objects to 4D commands on developer.4d.com.
If you cannot resize a BLOB due to insufficient memory, the error -108 is generated. You can trap this error using an ON ERR CALL interruption method.
When you are through with a large process or interprocess BLOB, it is good idea to free the memory it occupies. To do so, write:
SET BLOB SIZE(aProcessBLOB;0)
SET BLOB SIZE(◊anInterprocessBLOB;0)The following example creates a BLOB of 16K filled of 0xFF:
C_BLOB(vxData)
SET BLOB SIZE(vxData;16*1024;0xFF)
Product: 4D
Theme: BLOB
Number:
606
Created: 4D v6
Filler, Size
4D Language Reference ( 4D v20)
4D Language Reference ( 4D v20.1)
