DELETE FROM BLOB

This is the legacy 4D documentation web site. Documentations are progressively being moved to developer.4d.com

Home

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

Home

4D v20 R7

4D Language Reference

BLOB

DELETE FROM BLOB


DELETE FROM BLOB ( blob ; offset ; len )

Parameter	Type	Description
blob	BLOB	BLOB from which to delete bytes
offset	Longint	Starting offset where bytes will be deleted
len	Longint	Number of bytes to be deleted

Description

The DELETE FROM BLOB command deletes the number of bytes specified by len from the BLOB blob at the position specified by offset (expressed relative to the beginning of the BLOB). The BLOB then becomes len bytes smaller.

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.