printing - Send ESC commands to a printer in C#

Question

My application needs to print invoices, then a get the invoice from database, insert information on the invoice in a big string (telling the line, column, etc.) after this I have the string ready to be sent to a printer.

My problem is: I need to put some ESC/P commands/characters in my big string

I tried to do something like this:

        char formFeed = (char)12;
        Convert.ToChar(12);

        MyBigString.Insert(10, formFeed);

Whith this, the line 10 will do a FormFeed, but this doesn't work

NOTE: I send the MybigString all at once to the printer.

To make my code works, I need to send the data line by line to a printer?

Thanks for the help.

PS: Sorry, for my English, I'am a Brazilian developer which don't speak English (yet).

question from:https://stackoverflow.com/questions/65926450/how-to-send-ascii-command-to-epson-printer-from-c-sharp

Answer 1

Bypassing the printer driver and controlling the printer directly, using its native command language, is a supported scenario. The P/Invoke is explained well in this KB article.

Sure you want to do this? It is uncommon, to put it mildly, usually only attempted with low-cost Point-Of-Sale thermal or matrix printers. If you don't like the mechanics of PrintDocument.PrintPage, nobody does, you could consider my code in this thread. Note the FormFeed method.