CreateItemB Method


Creates an Item from Blob data. If a Group is open, then graphics are added to the Group, otherwise a new Item is created.


Visual Basic
Public Function CreateItemB( _
   ByVal blob As Variant, _
   ByVal projection As String, _
   ByVal fmt As Integer _
) As Integer


The stored Item Blob data, stored in an array of bytes, or in a stream.
The named Coordinate Reference System of the stored Item Blob. This can be defined as:
  • OGC URNs (eg 'urn:ogc:def:crs:OGC:1.3:CRS84')
  • EPSG URNs (eg 'urn:ogc:def:crs:EPSG::27700')
  • EPSG code strings (eg 'EPSG:27700')
  • EPSG URLs (eg '' or '')
  • EPSG codes as a simple string (eg '27700')
If blank, this will default to the current 'axes' CRS.

The format of the stored Item Blob.

SIS_BLOB_OGIS_WKB 1 = OGC Well-Known-Binary format
SIS_BLOB_OGIS_WKT 2 = OGC Well-Known-Text format
SIS_BLOB_OGIS_GML 3 = OGC Geographic Markup Language
SIS_BLOB_ESRI_SHP 4 = ESRI Shape (*.shp)
SIS_BLOB_SIS_BIN_ITEM 5 = Binary item
SIS_BLOB_GEOJSON 6 = Geographic Objects for JSON format


If a group is open, graphics are added to the group, otherwise a new item is created. When modifying an item which is stored as a Blob in a database, it is good practice to create a temporary version of the item on an editable overlay, and only commit the changes to the database, having got the new Blob string using GetBlob, when the user is satisfied with the changes.

This allows any changes to other columns in the database table to be done in the same transaction.

Available: GEO OM OD



sis.CreateItemB (blob, "*APrjNatGrid", SIS_BLOB_SIS)

Creates an item on the current overlay using the value of blob