更专业的条形码功能

专业报表虽然提供了一个RenderBarCode类型用于打印条形码，但是功能有限，且只能打印几种常见的一维码，对于二维码束手无策。
我们可以用BarCodeBuilder类型来为专业报表实现更专业的条形码打印功能。

示例一

生成一个简单的条码：

Dim doc As New PrintDoc
Dim rg As New prt.RenderGraphics
Dim Bar As New BarCodeBuilder
Bar.Symbology = Barpro.Symbology.Code39
bar.Code = "12345678"
rg = new prt.RenderGraphics
bar.DrawOnCanvas(rg.Graphics,0,0,1)
Doc.Body.Children.Add(rg)
Doc.Preview()

示例二

根据某表的内容，批量打印二维码：

Dim doc As New PrintDoc
Dim rg As prt.RenderGraphics
Dim Bar As New BarCodeBuilder
Bar.Symbology = Barpro.Symbology.QRCode
Doc.Stacking = prt.StackingRulesEnum.InlineLeftToRight
For Each r As Row In Tables("表A").Rows
    bar.Code = r("第一列")
    rg = new prt.RenderGraphics
    bar.DrawOnCanvas(rg.Graphics,0,0,1)
    rg.Style.Spacing.All = 3
    Doc.Body.Children.Add(rg)
Next
Doc.Preview()