You need to look at line 21 of your source code to see what it says instead of "&null".  It is likely that you have misspelled the name of a Unicon library procedure, or that you are not linked to the library because you have not set the necessary environment variables.
Also, some library routines require a "link" statement; I'm not sure which ones do and which ones don't.
============
Dick McCullough
knowledge := man do identify od existent done
knowledge haspart list of proposition
----- Original Message -----
From: yhou4
Sent: Wednesday, November 20, 2002 11:47 PM
Subject: [Unicon-group] Question about user interface

Hi,

I am a new user of Unicon. I try to learn the interface part and  follow the
source code of  listing 17-1(the first ecample of Chapter 17) of the book
"Programming in Unicon", but it dosen't work. I am sure my code is exactly
same as in the book, why does this happen?
Here is the error report:

Run-time error 106
File try.icn; Line 21
procedure or integer expected
offending value: &null
Traceback:
   main()
  
TestDialog(&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&
null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&
null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&null,&
null,&null,&null,&null,&null,&null,&null,&null,&null) from line 23 in try.icn
   TestDialog_initially(record TestDialog__state_1(record
TestDialog__state_1(48),record TestDialog__methods_1(91),record
TextButton__state_1(42),&null,&null,&null,set_3(0),&null,&null,&null,&null,&nu
ll,&null,&null,500,500,100,&null,&null,&null,&null,&null,&null,list_4(1),&null
,&null,&null,&null,"l","t",&null,&null,&null,&null,&null,list_5(1),&null,&null
,&null,&null,&null,&null,0,&null,&null,&null,&null,&null)) from line 28 in
try.icn
   &null("size=215,150","bg=light gray","font=serif","resize=on") from line 21
in try.icn


It seems that the statement "TestDialog()" in the procedure main doesn't work.


Thanks a lot for any help!



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