4D Doc Center : SET BLOB SIZE

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4D v14.3

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

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.

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:

 C_BLOB(vxData)

 SET BLOB SIZE(vxData;16*1024;0xFF)

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.