指定的打印机无效（有时它正在工作，有时它不会）

Question

我正在尝试从选定的网络打印机打印。有时它正在工作，但有时它不会打印，给我以下错误：

“指定的打印机无效.MyCrystalRPTfilename 11124_5324_ {67F07633-5EF3-49B4-9573-BB34151D75BA} .rpt”

我从网上找到了下面代码的不同部分。我知道之前有人问这个问题，但是给出的解决方案对我不起作用，也许我只是错过了一些东西。

Try

            Dim PrintDialog1 As New PrintDialog
            PrintDialog1.ShowDialog()
            PrintDocument1.PrinterSettings.PrinterName = PrintDialog1.PrinterSettings.PrinterName

            Dim prtdoc As New PrintDocument
            Dim strDefaultPrinter As String = PrintDialog1.PrinterSettings.PrinterName


            Dim cryRpt As New ReportDocument
            Dim crtableLogoninfos As New TableLogOnInfos
            Dim crtableLogoninfo As New TableLogOnInfo
            Dim crConnectionInfo As New ConnectionInfo
            Dim CrTables As Tables
            Dim CrTable As Table
            cryRpt.Load("C:\path\of\my\report\MyCrystalRPTfilename.rpt")

            With crConnectionInfo
                .ServerName = "myserver"
                .DatabaseName = "mydbase"
                .UserID = "myuser"
                .Password = "mypassword"
            End With

            CrTables = cryRpt.Database.Tables
            For Each CrTable In CrTables
                crtableLogoninfo = CrTable.LogOnInfo
                crtableLogoninfo.ConnectionInfo = crConnectionInfo
                CrTable.ApplyLogOnInfo(crtableLogoninfo)
            Next

            cryRpt.Refresh()
            cryRpt.PrintOptions.PrinterName = strDefaultPrinter
            cryRpt.PrintOptions.PaperSource = CrystalDecisions.[Shared].PaperSource.Auto
            cryRpt.PrintToPrinter(1, False, 1, 1)


        Catch ex As Exception
            MessageBox.Show(ex.InnerException.ToString())
        End Try

Answer 1

确保您打算使用的打印机在打印时确实存在：尝试使用以下方法检查：

if Not PrinterSettings.InstalledPrinters.OfType(Of String)().Any(Function (s) s.Equals(strDefaultPrinter)) Then
  ' Display/handle an error
End If

编辑

好的，根据使用的版本，SAP建议更改为使用PrintOutputController API，说明不再积极开发或支持PrintToPrinter：

1. 参考CrystalDecisions.ReportAppServer.Controllers和CrystalDecisions.ReportAppServer.ClientDoc
2. 使用有关默认打印机的信息创建“打印选项”对象

   Dim options = New PrintReportOptions With
   {
       .PrinterName = strDefaultPrinter,
       .Collated = False,
       .NumberOfCopies = 1,
       .JobTitle = report.Name
   }
   ' pass the options to the print method
   report.ReportClientDocument.PrintOutputController.PrintReport(options)
   ' If you're done
   report.Close()
   report.Dispose()