代码如下：红色部分代码都是双精度小数型   出现这个错误  怎么修正呢？

Dim fl As String = ProjectPath & "Reports\\test.pdf"
Dim cmd As new SQLCommand
cmd.Con necti onN ame="主数据源"
cmd.C ommandText = "se le ct * from {SYS_二维码参数及标签打印机设置} "
Dim dt11 As DataTable = cmd.ExecuteReader()
Dim dr11 As DataRow = dt11.DataRows(0)
output.show(1)
If dt11.datarows.count > 0 Then   \'如果有数据,就操作,反之不操作
    output.show(dr11("纸张宽度"))   这里可以输出值
    Dim doc As New PrintDoc() \'定义一个报表
    doc.PageSetting.Width = dr11("纸张宽度") \'纸张宽度    这里就开始提示错误
    doc.PageSetting.Height = dr11("纸张高度") \'纸张高度
    Doc.PrinterName = dr11("二维码打印机")    \'设定打印机为当前选择的打印机\'
    output.show(dr11("二维码打印机"))
    Dim img As prt.RenderImage   \'定义一个图像\'
    Dim Bar As New BarCodeBuilder
    Bar.Symbology = Barpro.Symbology.QRCode
    Bar.BarWidth = dr11("二维码宽度")
    Bar.BarHeight = dr11("二维码高度")
    Bar.QuietZoneWidth = dr11("二维码静区")
    Bar.QRCodeModuleSize = dr11("模组尺寸")
    Doc.Stacking = prt.StackingRulesEnum.InlineLeftToRight
    Bar.Code = dr11("二维码文本")
    img = new prt.RenderImage
    img.Image = bar.GetImage
    img.X=dr11("图片x")
    img.y=dr11("图片Y")
    img.Width = dr11("图片高度") \'宽度等于页面宽度
    img.Height = dr11("图片宽度") \'\'高度由图片大小自动决定
    Doc.Body.Children.Add(img)
    If dr11("打印或预览")="打印"  Then
        doc.Print
    Else
        doc.Preview()
    End If
End If

好的 谢谢老师 

Doc.PrinterName 这个有时候指定的 dr("二维码打印机") 的值    可能在本机电脑上不存在

要怎么判断dr("二维码打印机") 在本地电脑中有  才执行报表打印呢？

当前代码：

Dim guid As String = Args(0)
Dim cmd As new SQ LCommand
cmd.Con nection Name="主数据源"
cmd.Comman dText = "sel ect * from {SYS_二维码参数及标签打印机设置} "
Dim dt11 As DataTable = cmd.ExecuteReader()
Dim dr11 As DataRow = dt11.DataRows(0)
output.show(1)
Dim fl As String
If dt11.datarows.count > 0 Then   \'如果有数据,就操作,反之不操作
    output.show(dr11("纸张宽度"))
    Dim doc As New PrintDoc() \'定义一个报表
    doc.PageSetting.Width = cint(dr11("纸张宽度")) \'纸张宽度
    doc.PageSetting.Height = cint(dr11("纸张高度")) \'纸张高度
    Doc.PrinterName = dr11("二维码打印机")    \'设定打印机为当前选择的打印机\'
    output.show(dr11("二维码打印机"))
    Dim img As prt.RenderImage   \'定义一个图像\'
    Dim Bar As New BarCodeBuilder
    Bar.Symbology = Barpro.Symbology.QRCode
    Bar.BarWidth = cint(dr11("二维码宽度"))
    Bar.BarHeight = cint(dr11("二维码高度"))
    Bar.QuietZoneWidth = cint(dr11("二维码静区"))
    Bar.QRCodeModuleSize = dr11("模组尺寸")
    Doc.Stacking = prt.StackingRulesEnum.InlineLeftToRight
    For Each p As String In InstalledPrinters
       
        If dr11("二维码打印机")=p  Then
           
            cmd.Comma ndText = "sel e ct * from {XX_设备台账} where guid=\'" & guid & "\' "
            Dim dt111 As DataTable = cmd.ExecuteReader()
            Dim dr111 As DataRow = dt111.DataRows(0)
            If dt111.datarows.count > 0 Then
                fl = ProjectPath & "Reports\\" & dr111("设备编号") & "二维码.jpg"
                Bar.Code = dr111("设备编号")
                img = new prt.RenderImage
                img.Image = bar.GetImage
                img.X=cint(dr11("图片x"))
                img.y=cint(dr11("图片Y"))
                img.Width = cint(dr11("图片高度")) \'宽度等于页面宽度
                img.Height = cint(dr11("图片宽度"))\'\'高度由图片大小自动决定
                Doc.Body.Children.Add(img)
                doc.Print
            End If
        End If
    Next
End If

运行总提示：【有没有办法修正上述代码  当指定的二维码打印机在本地不存在的时候  让如下的两个提示都不再有呢】

谢谢 按老师指导：如果当前二维码打印机不存在  还是会提示如图  开始打印……及对应错误代码

麻烦老师继续指导下  谢谢！不想弹出开始打印……

详细错误代码：

错误的事件名称自定义函数,二维码打印
System.Reflection.TargetInvocationException: 调用的目标发生了异常。 ---> System.ComponentModel.Win32Exception: 已删除指定的打印机。
   在 System.Drawing.Printing.StandardPrintController.OnStartPrint(PrintDocument document, PrintEventArgs e)
   在 System.Drawing.Printing.PrintController.Print(PrintDocument document)
   在 System.Drawing.Printing.PrintDocument.Print()
   在 C1.C1Preview.C1PrintManager.Print(PrinterSettings printerSettings, PageSettings defaultPageSettings)
   在 Foxtable.PrintDoc.Print()
   在 UserCode.Ame3oeOl4rui6jRif(Object[] Args)
   --- 内部异常堆栈跟踪的结尾 ---
   在 System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   在 System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   在 System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   在 Foxtable.UserFunctions.Execute(String Name, Object[] Args)
2022-10-10 00:09:39

当前代码如下：

Dim guid As String = Args(0)
\'Dim erweimadayinji As String = Args(1)
Dim cmd As new SQLCommand
cmd.Conne ctionN ame="主数据源"
cmd.Com mand Text = "sele ct * from {SYS_二维码参数及标签打印机设置} " \'where 二维码打印机=\'" & erweimadayinji & "\'"
Dim dt11 As DataTable = cmd.ExecuteReader()
Dim dr11 As DataRow = dt11.DataRows(0)
output.show(1)
Dim fl As String
If dt11.datarows.count > 0 Then   \'如果有数据,就操作,反之不操作
    output.show(dr11("纸张宽度"))
    Dim doc As New PrintDoc() \'定义一个报表
    doc.PageSetting.Width = cint(dr11("纸张宽度")) \'纸张宽度
    doc.PageSetting.Height = cint(dr11("纸张高度")) \'纸张高度
    Doc.PrinterName = dr11("二维码打印机")    \'设定打印机为当前选择的打印机\'
    output.show(dr11("二维码打印机"))
    Dim img As prt.RenderImage   \'定义一个图像\'
    Dim Bar As New BarCodeBuilder
    Bar.Symbology = Barpro.Symbology.QRCode
    Bar.BarWidth = cint(dr11("二维码宽度"))
    Bar.BarHeight = cint(dr11("二维码高度"))
    Bar.QuietZoneWidth = cint(dr11("二维码静区"))
    Bar.QRCodeModuleSize = dr11("模组尺寸")
    Doc.Stacking = prt.StackingRulesEnum.InlineLeftToRight
    \'For Each p As String In InstalledPrinters
       
        If InstalledPrinters.Contains(dr11("二维码打印机")) Then
            Output.Show(InstalledPrinters.Contains(dr11("二维码打印机")))
            cmd.Comm andText = "sel ect * from {XX_设备台账} where guid=\'" & guid & "\' "
            Dim dt111 As DataTable = cmd.ExecuteReader()
            Dim dr111 As DataRow = dt111.DataRows(0)
            If dt111.datarows.count > 0 Then
                fl = ProjectPath & "Reports\\" & dr111("设备编号") & "二维码.jpg"
                Bar.Code = dr111("设备编号")
                img = new prt.RenderImage
                img.Image = bar.GetImage
                img.X=cint(dr11("图片x"))
                img.y=cint(dr11("图片Y"))
                img.Width = cint(dr11("图片高度")) \'宽度等于页面宽度
                img.Height = cint(dr11("图片宽度"))\'\'高度由图片大小自动决定
                Doc.Body.Children.Add(img)
                doc.Print
            End If
        End If
    \'Next
End If