4D v18
EXPAND BLOB
- 4D Language Reference
-
- BLOB
-
- BLOB Commands
- 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
EXPAND BLOB
| EXPAND BLOB ( blob ) | ||||||||
| Parameter | Type | Description | ||||||
| blob | BLOB |
|
BLOB to expand | |||||
The EXPAND BLOB command expands the BLOB blob that was previously compressed using the COMPRESS BLOB command.
After the call, the OK variable is set to 1 if the BLOB has been expanded. If the expansion could not be performed, the OK variable is set to 0.
If the expansion could not be performed because of a lack of memory, no error is generated and the method resumes its execution.
In any other case (i.e. the BLOB has not been compressed or is damaged), the error -10600 is generated. This error can be trapped using the ON ERR CALL command.
To check if a BLOB has been compressed, use the BLOB PROPERTIES command.
This example tests if the BLOB vxMyBlob is compressed and, if so, expands it:
BLOB PROPERTIES(vxMyBlob;$vlCompressed;$vlExpandedSize;$vlCurrentSize)
If($vlCompressed#Is not compressed)
EXPAND BLOB(vxMyBlob)
End ifThis example allows you to select a document and then expand it, if it is compressed:
$vhDocRef :=Open document("")
If(OK=1)
CLOSE DOCUMENT($vhDocRef)
DOCUMENT TO BLOB(Document;vxBlob)
If(OK=1)
BLOB PROPERTIES(vxBlob;$vlCompressed;$vlExpandedSize;$vlCurrentSize)
If($vlCompressed#Is not compressed)
EXPAND BLOB(vxBlob)
If(OK=1)
BLOB TO DOCUMENT(Document;vxBlob)
End if
End if
End if
End ifThe OK variable is set to 1 if the BLOB has been successfully expanded, otherwise it is set to 0.
Product: 4D
Theme: BLOB
Number:
535
Modified: 4D v6.5.3
Compression, Expansion
4D Language Reference ( 4D v18)
