GetBlobB Method
Description
Gets a Blob string of the current open Item, within a Coordinate Reference System
Syntax
Visual Basic |
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Public Function GetBlobB( _ ByVal projection As String, _ ByVal fmt As Integer, _ ByVal precision As Integer _ ) As Variant |
Parameters
- projection
- The named Coordinate Reference System of the returned Blob data. 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 'http://www.example.com/epsg#27700' or 'http://www.example.com/epsg.xml#27700')
- EPSG codes as a simple string (eg '27700')
- fmt
- 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 - precision
-
This parameter is ignored and will always return 64-bit precision.
If blank, this will default to the CRS of the current Item’s Dataset.
Return Type
A Variant containing an array of bytes that describe the current open Item in the chosen format.
Remarks
There is no limit on the length of Blob data arrays generated by SIS. There are however limits elsewhere: SIS datasets which read Blobs from data sources can use a fixed size communication buffer (use Cadcorp View Geometry Maximum Blob size properties to change the size of the communication buffer).
Available: GEO OD
Group:
Example
sis.GetBlobB ( "*APrjNatGrid", 0, 0 )
Returns the Blob data of the current item within the National Grid coordinate reference system.