The "~JA" command, as stated in ZPL Programming Guide vol.2, cancels all commands in the buffer.
We were using the ~JA at the start of every PRN file and it worked as intended on ZM400 and ZE500 models. The goal is to have only one printout in case multiple prints are triggered. So if I press "Print" 3 times, only the third label prints out.
I have tried:
- introducing the ~JA command through Zebra Designer interface
- introducing the ~JA manually in the PRN at the start of the PRN file as ~JA~; ~~JA~; ~JA
No luck. On the ZT410 nothing prints out, the printer just hangs there with the data led blinking.
Any ideas?
This is the kind of question that wants a higher level control at a lower level. If you only want 1 label to be printed after a button or print dialog is initiated, it needs to be done at a higher level than ZPL II. Sending a ~JA command typically just flushes the command buffer on a printer less than it does eliminate the ZPL that is being sent before it. In your case, you should eliminate the user's ability to hit the print button 3 times. Effectively adding a de bounce function to your higher level program. It is good however to send a flush command before sending the ZPL you want to print, in case a cached command for a label is stuck in the buffer for the printer. There have been instances where an old label will print out because I have neglected to send this command at the header of my ZPL generator.
Related
Zebra ZPL label printers carry over the print commands from print job to print job. So if you send a ^FWR command that rotates a label, all future jobs will be rotated, so you have to reset the orientation to ^FWN if you want to have the next label be printed in portrait mode.
Is there a way to automatically reset the 'standard' settings on a Zebra on each print job? So settings from the previous job don't carry over to the next job? I want every zpl file I send to the printer to be printed exactly the same, regardless of what was printed prior.
Or is there a default set of commands that I can send that reset the orientation, fonts, position, dpi, measurements, etc?
There's a command that does a power-on/factory reset, but I don't want to do that on every label print.
You can manually reset all unwanted settings.
This works for me
^PON^LH0,0^FWN
.
FWN resets field orientation
LH resets the offset
PO resets print orientation
Not sure if all of those are needed and/or others would be needed for you too. In my particular case, I did not need FWN.
My printing got messed up when pasting some sample ZPL to the printer. Next 30 labels had orientation and offset changed making them unusable. So I just have above command in beginning of my labels now.
You might specifically have to reset other settings too.
If you can send ZPL Before or After a label you want to print, add the commands you want, like ^PO outside of the begin ^XA/end ^XZ label. It should change it until another similar command is set.
I am writing a simple application that should implement the TELNET protocol.
I got to the point where I have to implement the console-like text behaviour. I need the following:
Something that prints out the message from the remote host (Different options available)
Something that gets my message to the remote host (Doable with an external text field)
What I am trying to achieve is a single text view/field that prints the output, gets my input in the same view, and doesn't let me edit the previously printed text (just like a regular terminal window)
I tried with a (scrollable)TextView, tweaking the isEditable field on and off, but it does not appear to be what I am looking for.
This is what appears to the user once the connection is established
This is what happens when the user press backspace.
I would also like to prevent the editing of all the text written before the last return key.
Am I checking out the correct container? Is there something more suitable for my need?
I'm working with Zebra ZT410 and would like to create a template label in ZPL that would be stored on the printer to allow users to print directly from the printer through custom menu in WML.
I'm having no problems creating custom menu, sending it to the printer and calling for the said ZPL file, but the printer is not asking for keyboard input when it should.
Example ZPL code:
CT~~CD,~CC^~CT~
^XA
^PW437
^FT40,167^A0N,25,24^FH\^FN1"EXAMPLE2"^FS
^PQ1,0,1,Y^XZ
When printing from Print Station option on the printer, printer correctly asks for the value of EXAMPLE2, when calling ZPL from custom menu, it just defaults to nothing and prints as there was no input.
Does anyone ever worked with something similar?
Ideally I would need 3 inputs from the barcode scanner to generate a very simple label. Would like to do it with printer and scanner alone if possible.
Thanks in advance.
I have faced with a similar issue.
Zebra support suggested to read WML from printer and see/modify them to create my own Print Station.
PrintStation is in z:TOOLS.WML
You can read files (send to host) with this SGD command
{}{"file.type":"Z:TOOLS.WML"}
I am trying to create a program which will have live updates from some data source. And I also want to wait for user input just like a normal terminal. Right now, whenever there is update, I will print the content and print the prompt message for input again which create something like this:
Enter command >
This is a live update message
Enter command >
This is a multi-line li......
......ve update message
Enter command > quit
Bye bye!
The problem is that for every live message I received, I will print it and the "Enter command >" will be displayed again again and again, which is not desired. I want the live update to be update on the main part of the terminal, while the "Enter command >" always stay at the bottom
The closest package I can found on Github is https://github.com/gizak/termui but most of the examples inside is trying to display text, gauge and graphs. So I am not quite sure how to get started.
Is there any package or example of the termui package to achieve this? Thank you.
With github.com/gizak/termui you're heading in the correct direction.
To understand why you can't get that
I want the live update to be update on the main part of the terminal, while the "Enter command >" always stay at the bottom
part sorted out, a little excursion to the history of computing is due. ;-)
The thing is, the mode your teminal emulator¹ works by default originated
in how computers would communicate to the operator in the era which predated
alphanumeric displays — they would print their responses using a line printer. Now think of it: a line printer works like this: it prints whatever is sent to it on a roll of paper. What was output, was output.
The new output always appears physically below the older.
When alphanumeric displays (screens) came into existence they
naturally continued to support this mode:
the line text to be output was rendered at the bottom of the screen
with the text above it scrolled upwards.
That's what you see in your typical terminal emulator all the time when you're working in the command line of a shell (such as bash) running by the emulator window.
This, default, work mode of a terminal is called "canonical" or "cooked".
Then came more advanced displays, for which it was possible to change
individual positions on the screen — identified by their column and
row numbers.
This changed the paradigm of how the information was output: the concept
of a so-called "full-screen application" was born.
Typical examples of them are text editors such as Vim and Emacs.
To support full-screen text output, terminals (and terminal emulators)
were adapted by implementing certain extensions to their protocols.
A full-screen application first requests the terminal to switch into another
mode called "raw", in which the terminal sends most of what is input by the
user directly to the program running on the terminal.
The program handles this input and orders the terminal where and what
to draw.
You can read this good summary
of the distinction between the both modes.
As you are supposedly suspecting by now, to be able to keep some block
of information at a certain fixed place of the terminal's text screen,
you want your program to be a full-screen program and use the terminal's
raw mode and its special commands allowing you to directly modify
text at certain character cells.
Now the problem is that different terminals (and terminal emulators)
have different commands to do that, so there exist libraries to isolate
the programs from these gory details. They rely on the special "terminal
information databases" to figure out what capabilities a terminal has
and how to make it do what the program asks.
See man terminfo for more background.
The most widely known such library (written in C) is called ncurses,
and there exist native solutions for Go with supposedly the most visible
one being github.com/nsf/termbox-go.
The github.com/gizak/termui makes use of termbox-go but for you it might
suffice to use the latter directly.
¹ Chances are very high you're not sitting at
a real hardware terminal
connected to a UNIX® machine but are rather working in a GUI application
such as GNOME Terminal or xterm or Termial.app etc.
These are not "terminals" per se but are rather
terminal emulators —
that is, pieces of software emulating a hardware terminal.
I am doing my first steps with GDB in TUI mode.
During the debug session I see that each line outputted to console occurs in a single line (in the picture you see 222222 highlighted in red). It is like having an output pane of one single line.
On top of that, each \n doesn't cleanup that line so all the strings do overwrite each other making my output very confusing.
Can you help me a bit with this issue or point me to some key command to look for in order to have a clean output?
I also highlighted another area (in the picture 1111111) because the first string is outputted there and then all other on the frame of the source code window.
You can always refresh tui screeen every time your program outputs something with Ctrl+L key binding. Or you can temporarily swith to normal mode, step and watch program output and switch back to tui mode (Ctrl+X A). See all key bindings here.