Gets a Blob string of the current open Item, within a Coordinate Reference System.
Visual Basic |
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Public Function GetBlob( _ ByVal projection As String, _ ByVal fmt As Integer, _ ByVal precision As Integer _ ) As String |
SIS_BLOB_SIS_V6_ASCII | 0 = Cadcorp SIS format |
SIS_BLOB_OGIS_WKT | 2 = OGC Well-Known-Text format |
SIS_BLOB_OGIS_GML | 3 = OGC Geographic Markup Language |
SIS_BLOB_GEOJSON | 6 = Geographic Objects for JSON format |
A string describing the current open Item in the chosen format. SIS format strings are encoded and can only be interpreted by SIS.
There is no limit on the length of Blob strings generated by SIS. There are however limits elsewhere: GisLink can only handle strings of a few Kb (this does not apply to the SIS Control); SIS datasets which read Blobs from data sources can use a fixed size communication buffer (use the Cadcorp OGC SQL92 Database Maximum Blob size, and Cadcorp View Geometry Maximum Blob size properties to change the size of the communication buffer).
Available: GEO ME MD OD SISpy
Groups:
sis.GetBlob ( "*APrjNatGrid", 0, 0 )
Returns the Blob string of the current item within the National Grid coordinate reference system.
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