How To Set Page Width And Height Of Printer Object

I m using two printers(Epson TM88III and HP2015) for printing. Printer is selected in run time in my code. at first time run epson printer showing receipt and HP printer showing print on A4 page properly. but when we run second time epson printer shows proper printing but HP printer start taking the width of epson on A4 page(Data are lost on A4 page due to less width). how can i resolve this problem.

What is your printing code?

I think I remember this one;

When closing your app, you need to point the printer-object back to the original (default) printer.

Good luck!

Its hard to say without seeing any of your code.