SET BLOB SIZE
SET BLOB SIZE ( blob ; size {; filler} )
| Parameter | Type | Description | |
|---|---|---|---|
| blob | Blob | → | BLOB field or variable |
| size | Integer | → | New size of the BLOB |
| filler | Integer | → | ASCII code of filler character |
Description
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.
Note
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.
Error Handling
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.
Example 1
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)
Example 2
The following example creates a BLOB of 16K filled of 0xFF:
var vxData : Blob
SET BLOB SIZE(vxData;16*1024;0xFF)
See also
Properties
| Command number | 606 |
| Thread safe | ✓ |