DR-Ant-Boy
❔ System.Io.Ports: The given port name (COM4) does not resolve to a valid serial port.
Hi, I've been using System.Io.Ports to connect to a USB thermal printer that I have connected to my computer. When trying to open the port to print, the functionality was working as expected and printing the documents, but after a day it started throwing the error mentioned above, and ever since i have not been able to open that port anymore because it says that the name is not valid.
4 replies
❔ POS Receipt Print using System.Drawing
Hi, has anyone ever implemented a receipt print functionality using System.Drawing for a POS thermal printer ? I need help getting mine working since the receipts are being printed with the wrong font size (too small), and with a lot of blank space at the top and bottom of the receipt
2 replies