[udf-dlm-develop] nasty problem

[Harald F. <hf...@ap...>]

Hi everybody,

I've been fighting with a nasty problem for several hours now, and I still don't 
have an idea about the cause. Maybe somebody has seen something similar, or has 
some ideas, where to look.

The FUV display software is IDL widget-based. When I open for instance several 
SI files after one another (the same for WIC), everything is still fine, as long 
as I go back in time. Whenever I have opened/read/closed a WIC file for say DOY 
187 and then try to open a new file for say DOY 337, I get the following message

UDF_OPEN: no data for this time period

The VERY BAD(!) thing is, I can not reproduce this kind of error, if I try the 
same thing outside of my widget environment. 

This is the part of IDL code which produces the error message

;=====================
	; open file and check for error
Catch, err_sts
print,'Start, stoptime: '
print,start_time,end_time,err_sts
IF (err_sts EQ 0) THEN fh  = UDF_Open(key, start_time, end_time) $
    ELSE print, !Error_State.Msg
Catch, /Cancel
;=====================

and this is the output of the print statements

Start, stoptime: 
    1999     187      11      30      19     695
    1999     187      16      22      29     959
           0
Start, stoptime: 
    1999     186       1      42      16     686
    1999     186       2      56      26     798
           0
Start, stoptime: 
    1999     337       7      21      11     530
    1999     337       7      27      21     538
           0
Start, stoptime: 
    1999     337       7      21      11     530
    1999     337       7      27      21     538
          -2
UDF_OPEN: no data for this time period

And I know for sure, that the last time period 1999-337-7-21-11 contains data, 
because everything is fine if I start with this time.

By the way I run

IDL> print,!version
{ sparc sunos unix 5.3 Nov 11 1999}

Any ideas are appreciated,
Harald

=========================================================
Harald U. Frey 
Space Sciences Lab	   phone: 510-643-3323
University of California   fax:   510-643-2624      
Berkeley, CA 94720-7450    email: hf...@ss...