1. ZPL II, ZBI 2, Set-Get-Do, Mirror, WML Programming Guide
  2. ZBI Commands
  3. TRACE
  • ZPL II, ZBI 2, Set-Get-Do, Mirror, WML Programming Guide
TRACE

TRACE

This command enables you to debug an application by outputting the executed line numbers and changed variables to the console.
Format
TRACE ON
TRACE OFF
Parameters
<ON/OFF>
= controls whether
TRACE
 is active (ON) or disabled (OFF).
If
DEBUG
 is activated and the
TRACE
 command is on, trace details are displayed. When any variables are changed, the new value displays as follows:
<TRACE> Variable
 =
New Value
Every line processed has its line number printed as follows:
<TRACE> Line Number
Example
An example of TRACE command in use:
10 LET A=5 
20 GOTO 40 
30 PRINT "Error" 
40 PRINT A 
DEBUG ON 
TRACE ON 
RUN 
<TRACE> 10 
<TRACE> A=5 
<TRACE> 20 
<TRACE> 40 
5
Comments
This can be an interactive command that takes effect as soon as it is received by the printer, or a program command that is preceded by a line number.
It is recommended that you avoid using the
TRACE
 command when writing programs in the ZBI‑Developer environment, instead use the Debug capabilities of ZBI-Developer.