RE: Example16 Error

[Scott Klement <sk@xxxxxxxxxxxxxxxx>]

Sender: Scott Klement <sk@xxxxxxxxxxxxxxxx>

Hi Steven,

I'm moving this back to the mailing list.  Sorry, I didn't notice that it 
got off-list somehow.

Here's how you find which statement the program crashes at:

a) Type STRDBG
b) The system will display the source for the program.  Press F12.
c) Type CALL EXAMPLE16 PARM('my tracking number here')

d) The system will run the program, and pop up the source code at the 
exact spot where it's crashing.

When I run it using your tracking number, here's the screen I get:

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

                             Display Module Source

 Program:   EXAMPLE16      Library:   LIBHTTP        Module:   EXAMPLE16
   1806       1805
   1807       1806   when  path = '/TrackResponse/Shipment/Package/Activit
   1808       1807                '/ActivityLocation/Address';
   1809       1808
*** the following line is in high-intensity ****
   1810       1809       LoadAddress(name: value: r.package(pc).activity(a
   1811       1810
   1812       1811   when  path = '/TrackResponse/Shipment/Package/Activit
   1813       1812                '/Status/StatusType';
   1814       1813
   1815       1814       select;
   1816       1815       when name = 'Code';
   1817       1816          r.package(pc).activity(ac).statuscode = value;
   1818       1817       when name = 'Description';
   1819       1818          r.package(pc).activity(ac).status = value;
   1820       1819       endsl;
                                                                        Mo
 Debug . . .

 F3=End program   F6=Add/Clear breakpoint   F10=Step   F11=Display variabl
 F12=Resume       F17=Watch variable   F18=Work with watch   F24=More keys
 Range of subscript value or character string error.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

So, it's crashing with an array index error on the "LoadAddress" line 
(statement 1810/1809 above.) Since that line uses two arrays, I display 
what the indexes the arrays are.

e) I type the following in the debugger:

     eval pc

It prints "1", so that's not it.

f) I type the following next:

     eval ac

It prints "6".

g) I look at the source code to see how big these arrays are.  The 
"package" array is 10 elements, but pc was 1.  not a problem.  The 
"activity" array was 5 elements, and ac was 6.  Hmmm... that could be a 
problem.

h) I hit F3 to exit the debugger.

i) I change the size of the "activity" array to be 10 elements.

j) I recompile EXAMPLE16 and run it again without errors.


Using that method, it's actually pretty easy to narrow down where the 
error is, so I figured it might be more valuable for me to explain the 
method than it would be to simply tell you what I found.



On Fri, 3 Mar 2006, Steven Molinaro wrote:
> Hi .. I am having a hell of a time trying to actually pinpoint where 
> exactly it is bombing out. I imagine it's because of all the C functions 
> that are being called. If it's any help to you, I am calling the 
> example16 pgm with a parm of '1Zxxxxxxxxxxxxxxxx' .. If you do the same, 
> you'll see it happen and maybe it will be clearer to you.
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