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IDL XDR Problem [message #9444]

Mon, 07 July 1997 00:00

Justin Baker
Messages: 16
Registered: May 1995

Junior Member

Hi there,

I've got a problem with IDL when reading XDR data generated by a C
program.
I can happily read in longs or floats, but IDL gives a strange error
when I try and read in strings.

i.e % READU: Error encountered reading from file. Unit: 1

My program is very simple, for example

...
max_recs = 1000
rec = {i:0, l:0L, f:0.0, s:''}
data = replicate(rec,max_recs)

openr, /XDR, 1, bin_file,ERROR=err

rec_count = 0

while ((rec_count lt max_recs) and (NOT EOF(1))) do begin

readu, 1, rec
data(rec_count) = rec
rec_count = rec_count + 1
endwhile

One clue (that hasn't really helped !) is the IDL v4 user's guide (p
17-33). It demonstrates all that is needed to read XDR data into an IDL
program, but the C code it provides shows strings being written out
using a routine called xdr_counted_string().

Our machine (running AIX) only has xdr_string() and I can't find a
reference to this other routine on any other platforms (such as Sun)
either.

Has anyone else had a similar problem to mine ?

Thanks in advance,
Justin.

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[Message index]

		IDL XDR Problem By: Justin Baker on Mon, 07 July 1997 00:00
		Re: IDL XDR Problem By: jackel[1] on Mon, 07 July 1997 00:00

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