帮助Microsoft Opos打印 [英] Help with microsoft Opos printing

问题描述

有一台epson TM-T20II pos打印机。

Hi, have an epson TM-T20II pos printer.

我在这部分遇到问题，用代码测试打印机，打印机在usb端口上有效b $ b

i'm having problems in this part to test the printer with code, printer is instaled on usb port

    Public Shared Function GetAndInitPosPrinter() As Microsoft.PointOfService.PosPrinter
        Dim pe As New PosExplorer()
        Dim ppdi = pe.GetDevice(DeviceType.PosPrinter, "MyPosPrinter1")
        Dim pp As Microsoft.PointOfService.PosPrinter = pe.CreateInstance(ppdi) 'error says i need to determine a null object
        pp.Open()
        pp.Claim(250)
        pp.DeviceEnabled = True
        Return pp
    End Function

推荐答案

我遇到了问题在这部分用打印机代码测试打印机，打印机在usb端口上安装

i'm having problems in this part to test the printer with code, printer is instaled on usb port

你需要检查GetDevice之前是否成功尝试使用它返回的设备。

You need to check that GetDevice has succeeded before trying to use the device it returns.

应该在POS论坛上询问有关POS的问题：

https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=posfordotnet

Questions about POS should be asked in the POS forum:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=posfordotnet

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