EXPAND BLOB
EXPAND BLOB ( blob )
| Parameter | Type | Description | |
|---|---|---|---|
| blob | BLOB | 🡒 | BLOB to expand |
Description
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.
Example 1
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 if
Example 2
This 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 if
System variables and sets
The OK variable is set to 1 if the BLOB has been successfully expanded, otherwise it is set to 0.