HDFGETNT Function

Obtains the HDF number type (i.e., data type) and descriptive number type string for the current HDF Scientific Data Set.


SUCCEED (0)	Indicates success.
FAIL (-1)	Indicates failure.

Keywords

Help

If present and nonzero, lists the usage for this routine.

Name Returns HDF SDS numeric data type as a string, e.g., "DFNT_FLOAT32". This keyword is more for human use than programmatic use.

Usage If present and nonzero, lists the usage for this routine. (Same as the Help keyword.)

Wavecast Returns a string containing the PV-WAVE data type cast that is equivalent to an HDF SDS numeric data type. You can use the string in a PV-WAVE EXECUTE statement to dynamically declare a PV-WAVE variable for use with HDF. Example value: "FLTARR".

Wavetype Returns a string containing the PV-WAVE data type that is equivalent to a HDF SDS numeric data type. This string can be used to programmatically change the data type of a given PV-WAVE variable to the type required for HDF. Example value: "FLOAT".

Discussion

HDFGETNT gets the current HDF Scientific Data Set numeric (data) type in a number of different formats. The primary format, where only type is returned, is a simple numeric value that corresponds to a specific numeric type. Keywords facilitate mapping of this value to strings that are of greater use to the PV-WAVE programmer. These strings can be used with the PV-WAVE command EXECUTE to dynamically declare an array for use with an HDF Scientific Data set.

Example

 wavetype = ''
 status = HDFGETNT (type, Name=typename,  $
    Wavetype=wavetype)
 IF (status EQ FAIL) THEN  $
    MESSAGE, /Continue,'HDFGETNT failed.'
 IF (!Hdf_debug GE 1) THEN  $
    MESSAGE, /Continue,'Data type is:' +   $
        typename + "(' + wavetype + ')"
 arg_size = SIZE (maxvalue)
 arg_type = arg_size (arg_size(0) + 1)
 IF (arg_type EQ 0) THEN BEGIN

 decl = 'maxvalue = ' + wavetype + '(0)' 
 status = EXECUTE (decl)

 ENDIF

HDFGETNT Function

Usage

Output Parameter

Return Value

Keywords

Discussion

Example

See Also