Date   : Wed, 28 Mar 1984 06:49:04-MST
From   : Rick Conn <RCONN@SIMTEL20.ARPA>
Subject: ZCPR3 Intro - Message 6: Error Handlers

                     ZCPR3 - Error Handlers

               Under  ZCPR3,  Error  Handlers  are  programs 
         which  handle command line errors in a "nice"  way.  
         They  may  be used anywhere,  including within  ZEX 
         command files.  A few examples:

B1:WORK2>NOTE There are a number of error handlers on this system:
B1:WORK2>dir root:error?.com s
 ERROR1  .COM    2r| ERROR2  .COM    4r| ERROR3  .COM    2r| ERROR4  .COM    2r
             A15:ROOT --     4 Files Using    10K (  204K Left)


               Error Handlers are installed by simply giving 
         their name.

B1:WORK2>error4
ERROR4, Version 1.0
 Error Handler Installed

B1:WORK2>NOTE ERROR4 is a simpler error handler
B1:WORK2>NOTE with the invalid command "XXXX";xxxx

 File XXXX.COM Not Found

B1:WORK2>NOTE ERROR4 simply says what happened


               Error  Handlers  may  vary  in  features  and 
         complexity.   ERROR1  is one of the  more  complex.  
         ERROR2, by the way, is a screen-oriented version of 
         ERROR1,  using reverse video and cursor addressing.  
         See the section on Z3TCAP later for more details.

B1:WORK2>error1;NOTE ERROR1 is a more sophisticated error handler
ERROR1, Version 1.0
 Error Handler Installed

B1:WORK2>xxxx

ERROR1, Version 1.0

Error Line is:
   XXXX

Options are: 
 1. Replace Command in Error with a New Command
     Replace XXXX
 2. Advance to Next Command and Resume Processing
     Advance to 
 3. Replace Entire Line with a New Line
     Replace XXXX
 4. Throw Away Entire Line and Continue
     Throw Away XXXX

Select Option - 1
Replacement Command?
  dir
 DEMO    .BAK    0 | DEMO    .TXT    2 | DEMO    .ZEX    2 | DEMO1   .TXT    2 
 DEMO2   .TXT    2 | DEMO3   .TXT    2 | RHEX    .COM    2r| RHEX2   .COM    2r
             B1:WORK2 --     8 Files Using    14K (  288K Left)
B1:WORK2>xxxx;dir *.com

ERROR1, Version 1.0

Error Line is:
   XXXX;DIR *.COM

Options are: 
 1. Replace Command in Error with a New Command
     Replace XXXX
 2. Advance to Next Command and Resume Processing
     Advance to DIR *.COM
 3. Replace Entire Line with a New Line
     Replace XXXX;DIR *.COM
 4. Throw Away Entire Line and Continue
     Throw Away XXXX;DIR *.COM

Select Option - 2

 RHEX    .COM    2r| RHEX2   .COM    2r
            B1:WORK2 --     2 Files Using     4K (  288K Left)