Use the HasArray method to determine if a data container contains a particular array of data objects.
Example
e = ENVI(/HEADLESS)
container = ENVIDataContainer()
File = Filepath('qb_boulder_msi', Root_Dir=e.Root_Dir, $
Subdir = ['data'])
Raster = e.OpenRaster(File)
VectorFile = Filepath('qb_boulder_msi_vectors.shp', $
Root_Dir=e.Root_Dir, Subdir = ['data'])
Vector = e.OpenVector(VectorFile)
container.AddArray, 'MyContainer', Raster
container.AddArray, 'MyContainer', Vector
result = container.HasArray('MyContainer')
Print, result
Result:
1
Syntax
Result = ENVIDataContainer.HasArray(Key [, ERROR=value])
Return Value
This routine returns 1 if the data container contains a specified array name. Otherwise, it returns 0.
Arguments
Key
Specify a string identifier with the name of the data container array.
Keywords
ERROR
Set this keyword to a named variable that will contain any error message issued during execution of this routine. If no error occurs, the ERROR variable will be set to a null string (''). If an error occurs and the routine is a function, then the function result will be undefined.
When this keyword is not set and an error occurs, ENVI returns to the caller and execution halts. In this case, the error message is contained within !ERROR_STATE and can be caught using IDL's CATCH routine. See IDL Help for more information on !ERROR_STATE and CATCH.
See Manage Errors for more information on error handling in ENVI programming.
Version History
API Version
4.3
See Also
ENVIDataContainer