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I am writing a custom module that will be used to print consignment labels for a shipping provider.

The labels print 4 to a page. The module provides a form that allows the user to specify the number of packages, the dimensions etc then prints a label for each package. I will want to format them with CSS so that they print correctly to the label peel off sections etc

One way I had worked out to do this was to have a second form on the page which submits to a PHP file in my module directory. I place the code in this PHP page to process the labels and output which I can then print from.

This solution works, however it is outside of Drupal in that the form posts to a standalone PHP script. Is there a way to do this within Drupal? I have looked at the Print, PDF module but I dont know if I can configure it in this way.

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If you want to break out of the theming system and display your own markup for a page you can do so.

Simply print whatever you want in your callback and rather than returning the content do an exit;

It isn't very elegant but it will do the job.

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A simple solution is to store submitted data in $form_state['storage] and rebuild then form. Then in form function, you can check to see if the $form_state has the submitted data and display the result instead, or the result and the form.

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