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    <p>You are running into a few obstacles:</p> <p>1) When you print through the OS installed printer driver, the printer driver is trying to take the data that is sent to it and (re)rasterize or scale it for the output device (the Zebra printer). Since the printer is a relatively low resolution at 203dpi, then it does not take too much for the scaling the print driver is having to do for it to loose some integrity in the quality of the barcode. This is why barcodes generated using the direct ZPL commands are <strong>much</strong> more reliable. </p> <p>2) Due to the security that web browsers purposefully provide by not allowing access to the client computer, you cannot directly communicate with the client connected printer. This sandboxing is what helps to protect users from malware so that nefarious websites cannot do things like write files to the client machine or send output directly to devices such as printers. So you are not able to directly send the ZPL commands through the browser to the client connected printer. </p> <p>However, there is a way to do what you describe. The steps necessary are typically only going to be useful if you have some degree of control over the client computer accessing the site that is trying to print to the Zebra printers. For example this is only going to be used by machines on your company network, or by clients who are willing to install a small application that you need to write. To do this, you will need to look at the following steps:</p> <p>A) You need to make up your own custom MIME type. This is basically just any name you want to use that is not going to collide with any <a href="http://www.iana.org/assignments/media-types/index.html">registered MIME types</a>. </p> <p>B) Next you will define a filename extension that will map to your custom MIME type. To do this, you typically will need to configure your web server (steps for this depend on what web server you are using) to allow the new MIME type you want to define and what file extension is used for these types of files.</p> <p>C) Then on your web application, when you want to output the ZPL data, you write it to a file using a filename extension that is mapped to your new MIME type. Then once the file is generated, you can either provide an HTML link to it, or redirect the client browser to the file. You can test if your file is working correctly at this point by manually copying the file you created directly to the raw printer port. </p> <p>D) Next you need to write a small application which can be installed on the client. When the application is installed, you need to have it register itself as a valid consuming application for your custom MIME type. If a browser detects that there is an installed application for a file of the specified MIME type, it simply writes the file to a temporary directory on the client machine and then attempts to launch the application of the same registered MIME type with the temporary file as a parameter to the application. Thus your application now just reads the file that the browser passed to it and then it attempts to dump it directly to the printer. </p> <p>This is an overview of what you need to do in order to accomplish what you are describing. Some of the specific steps will depend on what type of web server you are using and what OS your clients machines are. But this is the high level overview that will let you accomplish what you are attempting.</p>
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    1. POPrint barcodes from web page to Zebra printer
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    1. COWhat about the pass through mode that can be enabled on the printer options? According to Zebra manual one should be able to access the pass through from any Windows application as long as the mode is enabled on the settings which it is.
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    2. COEven if the installed print driver did allow that, you are still constrained by what the browser will let you do in #1 of my response above. If that does work, then your end user will still get a print dialog they need to respond to and select the correct printer. Not a bad trade off, but potentially still a little error prone due to extra steps the end user needs to do.
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    3. COWe had to do this to print bar codes once. Its a nightmare, right an application instead, most printers have APIs for this, some have web apis, but they are not always well supported.
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