| Re: reading HDF with HDF_SD_START() [message #56139 is a reply to message #56138] |
Sun, 07 October 2007 20:33   |
fanxing_gis
Messages: 8
Registered: August 2007
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Junior Member |
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On 10 8 , 9 49 , David Fanning <n...@dfanning.com> wrote:
> fanxing_...@163.com writes:
>> i want to process image data using IDL,so the first step is to
>> read the data, the format of my data is in HDF, the code i writed as
>> follows:
>> IDL> a=dialog_pickfile()
>> IDL> hdfid=hdf_sd_start(a)
>> unluckily i encounter the error, the message is:
>
>> HDF_SD_START: Unable to start the HDF-SD interface.
>> Execution halted at: $MAIN$
>> what's wrong with it? please help me or give me some hints about this
>> problem!
>
> You may find this article to be of interest:
>
> http://www.dfanning.com/fileio_tips/nohdf.html
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
thank you,David
i'm sorry to state the occasion when the error listed above occurs.I
write a programme to view the HDF data structue including scientific
data set,global attributes and attributes of SD.To do that i start a
new IDL session and open the HDF file with hdf_sd_stat(),it worked
well, all the SDs were listed in widget_list using hdf_get_info(),here
i click each of the SDS the attributes or the information of the SDS
could be showed in a text widget, at the beginning it is run well,but
repeat the process several times the programme was halted and the
error message is printed:
HDF_SD_START: Unable to start the HDF-SD interface.
Execution halted at: $MAIN$
in the same session i write the follow code in command line,and the
same error message printed as above.
IDL> a=dialog_pickfile()
IDL> hdfid=hdf_sd_start(a)
after that,i try the fileinfo() function, it's worked well,the result
is as follows:
** Structure <11534e0>, 7 tags, length=36, data length=36, refs=1:
NAME STRING 'D:\AST_09T_003080820010402180000000.hdf'
EXIST LONG 1
READ LONG 1
WRITE LONG 1
HDF LONG 1
NETCDF LONG 0
SIZE LONG 14324417
if i describe that clearly ,i hope you kind guys could help me
thanks
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