C# – Print ZPL to Zebra Printer via C#.NET

cnetvisual-studio-2017windows 10zebra-printers

I am working on building a website that will print ZPL code to a Zebra printer "140XiIII". The specifics are as follows:

The Printer is connected to the computer via Parallel Port.
The Printer is not connected to the network.
Website Administrator wished to avoid Javascript use if at all possible and instead focus on C#.

I have tried using the code at .NET code to send ZPL to Zebra printers that states that it will work on any port. I run through the code and get no errors, but also nothing gets sent to the printer.

I have attempted to decipher and use the InpOut32/64 DLL, though that is more complicated than my meager learnings are able to understand.

Other options either require the printer be connected to the network, or are outdated and no longer an option due to no longer being in the Windows code.

Thank you.

Best Answer

I would suggest trying the following:

Log into the server, preferably as the user that the service is set to run as.
Ensure your Zebra printer is installed as a local printer, and the printer name is correct.
Print a test page from the printer properties.
Print your ZPL manually:

net use lpt1 "printer shared name" print "C:\Users\serviceuser\desktop\label.txt"

If you try the above and it works, I would be surprised that the code you linked does not work.

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float and double are floating binary point types. In other words, they represent a number like this:

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The binary number and the location of the binary point are both encoded within the value.

decimal is a floating decimal point type. In other words, they represent a number like this:

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Again, the number and the location of the decimal point are both encoded within the value – that's what makes decimal still a floating point type instead of a fixed point type.

The important thing to note is that humans are used to representing non-integers in a decimal form, and expect exact results in decimal representations; not all decimal numbers are exactly representable in binary floating point – 0.1, for example – so if you use a binary floating point value you'll actually get an approximation to 0.1. You'll still get approximations when using a floating decimal point as well – the result of dividing 1 by 3 can't be exactly represented, for example.

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For values which are "naturally exact decimals" it's good to use decimal. This is usually suitable for any concepts invented by humans: financial values are the most obvious example, but there are others too. Consider the score given to divers or ice skaters, for example.
For values which are more artefacts of nature which can't really be measured exactly anyway, float/double are more appropriate. For example, scientific data would usually be represented in this form. Here, the original values won't be "decimally accurate" to start with, so it's not important for the expected results to maintain the "decimal accuracy". Floating binary point types are much faster to work with than decimals.

Best Answer

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