.net pos打印机卷式打印

Question

I am developing a system for supermarket which will prints pos bill after invoicing using .net.

For the bill printing I am using System.Drawing.Printing in .net.

The issue was when the item list is too long , when it increase the one page limit pos printer only prints the first page and cut paper.

Following is the code sample for printing which I used. Please help me to solve this.

Private Sub printInvoice()

     Dim printDocument As New PrintDocument
     Dim printController As New StandardPrintController
     printDocument.PrintController = printController
     AddHandler printDocument.PrintPage, AddressOf PrintDocumnet_Event
     printDocument.Print()

End Sub

Public Sub PrintDocumnet_Event(ByVal sender As Object, ByVal e As PrintPageEventArgs)
    Try
        Dim dataFont As Font = New Font("Courier New", 9, FontStyle.Bold)
        Dim leftMargin As Integer = 15
        Dim topMargin As Integer = 65


        For Each invoiceRow As DataRow In dtInvoice.Rows
            Dim code As String = invoiceRow("Item_Code").ToString.Trim
            Dim name As String = invoiceRow("Print_Name").ToString.Trim
            Dim price As String = String.Format("{0:0.00}", Double.Parse(invoiceRow("Price"))) + "x"
            Dim qty As String = String.Format("{0:0.###}", Double.Parse(invoiceRow("Qty")))
            Dim amont As String = String.Format("{0:0.00}", Double.Parse(invoiceRow("Amount")))
            Dim discount As String = String.Format("{0:0.00}", Double.Parse(invoiceRow("Discount")))


            e.Graphics.DrawString(String.Format("{0,-8}", name), dataFont, Brushes.Black, leftMargin, topMargin)
            topMargin += 15
            e.Graphics.DrawString(String.Format("{0,-10} {1,7} {2,5} {3,8}", code, price, qty, amont), dataFont, Brushes.Black, leftMargin, topMargin)
            topMargin += 20
        Next
End Sub

Answer 1

Thanx for all. I found the solution. I had to check the page height according to item list and add the following when the page exceeds.

 e.HasMorePages = True