| Re: supressing messages [message #16413 is a reply to message #16334] |
Thu, 22 July 1999 00:00   |
Mark Rehbein
Messages: 8
Registered: January 1999
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Junior Member |
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Liam Gumley wrote:
> Mark Rehbein wrote:
>> I use IDL5.2 on Solaris2.6 Sun machine.
>> My program uses the HDF file routines including HDF_SD_ATTRFIND.
>>
>> usage: attribute_index=HDF_SD_ATTRFIND(SDS_ID, 'attribute_name')
>>
>> if the specified attribute is not found then -1 is returned....fair
>> enough
>>
>> If I call the HDF_SD_ATTRFIND and the attribute is not found I get -1
>> returned but also a message is directed to the screen which says
>>
>> "%HDF_SD_ATTRFIND: Unable to find the HDF-SD attribute."
>>
>> I want to suppress this message so that it doesn't appear on my screen.
>>
>> I've looked through my manuals and the tips at dfanning.com but couldn't
>> find and reference to this sort of thing.
>
> To get around this problem, you should first scan the SDS to see what
> attribute names are available. Let's say you want to get the attribute
> 'scale_factor' if it exists:
>
> ;---cut here---
>
> ;- Get the number of attributes
>
> hdf_sd_getinfo, sds_id, natt=natt
>
> ;- Get the name of each attribute
>
> if natt gt 0 then begin
> att_names = strarr(natt)
> for i = 0, natt - 1 do begin
> hdf_sd_attrinfo, sds_id, i, name=name
> att_names[i] = name
> endfor
> endif
>
> ;- If the requested attribute was found, get it's value
>
> requested_name = 'scale_factor'
> if natt gt 0 then begin
> index = where(att_names eq requested_name, count)
> if count gt 0 then begin
> att_id = hdf_sd_attrfind(sds_id, requested_name)
> hdf_sd_attrinfo, sds_id, att_id, data=requested_value
> endif
> endif
> if n_elements(requested_value) gt 0 then begin
> help, requested_value
> print, requested_value
> endif
>
> ;---cut here---
>
> This method is used in my general purpose HDF SDS reader procedure
> SDS_READ, which is available at
> http://cimss.ssec.wisc.edu/~gumley/sds_read.html
>
> Cheers,
> Liam.
>
> --
> Liam E. Gumley
> Space Science and Engineering Center, UW-Madison
> http://cimss.ssec.wisc.edu/~gumley
Thanks Liam,
I checked out your SDS_READ application. It looks good and will probably use
it for exploring my HDF's.
cheers
mark
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