VB.NET条码机打印设置纸张大小的方法

Imports System.Drawing.Printing
Imports System.Runtime.InteropServices

Public Class Page
    <Runtime.InteropServices.DllImport("winspool.Drv", EntryPoint:="OpenPrinterW", _
      SetLastError:=True, CharSet:=CharSet.Unicode, _
      ExactSpelling:=True, CallingConvention:=CallingConvention.StdCall)> _
   Public Shared Function OpenPrinter(ByVal src As String, ByRef hPrinter As IntPtr, ByVal pd As Long) As Boolean
    End Function

    <System.Runtime.InteropServices.DllImportAttribute("winspool.drv", SetLastError:=True)> _
    Public Shared Function ClosePrinter(ByVal phPrinter As IntPtr) As Integer
    End Function

    <DllImport("winspool.drv")> _
    Public Shared Function SetPrinter(ByVal hPrinter As IntPtr, ByVal level As Integer, ByVal lpBytes As IntPtr, ByVal command As Integer) As Boolean
    End Function

    Public Shared Function Setting(ByVal PageName As String) As Boolean
        Try
            Dim printerSettings As PrinterSettings
            Dim document As New PrintDocument()

            printerSettings = document.PrinterSettings

            Dim hPrinter As IntPtr
            OpenPrinter(printerSettings.PrinterName, hPrinter, 0)

            Dim p As PaperSize = Nothing
            Dim ps As PaperSize
            For Each ps In document.PrinterSettings.PaperSizes
                If ps.PaperName.Equals(PageName) Then
                    p = ps
                End If
            Next
            document.DefaultPageSettings.PaperSize = p

            Dim hDevMode As IntPtr = printerSettings.GetHdevmode(document.DefaultPageSettings)
            Dim ret As Boolean = SetPrinter(hPrinter, 9, hDevMode, 0)
            ClosePrinter(hPrinter)
            Return True
        Catch ex As Exception

        End Try

    End Function
End Class

原文地址:https://www.cnblogs.com/lbnnbs/p/4784581.html