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Barcode Professional for ASP.NET使用教程：指定区域条码的显示

需求：

Barcode Professional for ASP.NET v3.0以上
Microsoft .NET 框架（所有版本）

由于条件的限制，条码显示位置有限，那么就需要懂得规定的区域内显示条码方法。今天将给大家简单介绍如何在规定区域内显示条码。

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我们知道在Barcode Professional有GetBarcodeImage()方法，而这种方法可以通过barsAreaSizeInInches参数实现规定区域内条码的显示。现在我们需注意以下三点：

规定区域的尺寸位置（条码宽和高）
规定目标区域的宽（包括条码加上左右Quiet Zones 区域的宽）
规定目标区域的高（条码栏高度）

假定：编码的数据是1234567890，使用128代码，以300DPI呈现，可供条码显示的位置面积是1*0.5英寸.

参考代码：

Private Sub SaveBarcode() 'Create a Barcode Professional object Dim bcp As New Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional() 'Set the barcode symbology to Code 128 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128 'Set the value to encode bcp.Code = "1234567890" 'Barcode dimensions settings bcp.BarHeight = 1.0F bcp.BarWidth = 0.01F 'Resolution Dim dpi As Single = 300.0F 'Target size in inches Dim targetArea As New System.Drawing.SizeF(1.0F, 0.5F) 'Get the barcode image fitting the target area Dim imgBarcode As System.Drawing.Image = bcp.GetBarcodeImage(dpi, targetArea) 'Save it on disk in PNG format imgBarcode.Save("C:/temp/barcode128.png", System.Drawing.Imaging.ImageFormat.Png) imgBarcode.Dispose() End Sub

private void SaveBarcode() { //Create a Barcode Professional object Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp = new Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional(); //Set the barcode symbology to Code 128 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128; //Set the value to encode bcp.Code = "1234567890"; //Barcode dimensions settings bcp.BarHeight = 1.0f; bcp.BarWidth = 0.01f; //Resolution float dpi = 300.0f; //Target size in inches System.Drawing.SizeF targetArea = new System.Drawing.SizeF(1.0f, 0.5f); //Get the barcode image fitting the target area System.Drawing.Image imgBarcode = bcp.GetBarcodeImage(dpi, targetArea); //Save it on disk in PNG format imgBarcode.Save(@"C:/temp/barcode128.png", System.Drawing.Imaging.ImageFormat.Png); imgBarcode.Dispose(); }

需要注意的是目标宽度是整个条码栏宽度加上左右两边的Quiet Zones (QuietZoneWidth属性 )，然而目标区域高度仅仅只是条码栏的高度，可参考下图（前面代码生成）。

Barcode Professional for ASP.NET使用教程：指定区域条码的显示

如果只想条码布满整个目标区域，需要将QuietZoneWidth属性设置为0（即除去左右两边的边距）DisplayCode属性设置为False（即隐藏可读文本），可参考下列代码

Private Sub SaveBarcode() 'Create a Barcode Professional object Dim bcp As New Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional() 'Set the barcode symbology to Code 128 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128 'Set the value to encode bcp.Code = "1234567890" 'Barcode dimensions settings bcp.BarHeight = 1.0F bcp.BarWidth = 0.01F bcp.QuietZoneWidth = 0 bcp.DisplayCode = False 'Resolution Dim dpi As Single = 300.0F 'Target size in inches Dim targetArea As New System.Drawing.SizeF(1.0F, 0.5F) 'Get the barcode image fitting the target area Dim imgBarcode As System.Drawing.Image = bcp.GetBarcodeImage(dpi, targetArea) 'Save it on disk in PNG format imgBarcode.Save("C:/temp/barcode128_full.png", System.Drawing.Imaging.ImageFormat.Png) imgBarcode.Dispose() End Sub

private void SaveBarcode() { //Create a Barcode Professional object Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp = new Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional(); //Set the barcode symbology to Code 128 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128; //Set the value to encode bcp.Code = "1234567890"; //Barcode dimensions settings bcp.BarHeight = 1.0f; bcp.BarWidth = 0.01f; bcp.QuietZoneWidth = 0; bcp.DisplayCode = false; //Resolution float dpi = 300.0f; //Target size in inches SizeF targetArea = new System.Drawing.SizeF(1.0f, 0.5f); //Get the barcode image fitting the target area System.Drawing.Image imgBarcode = bcp.GetBarcodeImage(dpi, targetArea); //Save it on disk in PNG format imgBarcode.Save(@"C:/temp/barcode128_full.png", System.Drawing.Imaging.ImageFormat.Png); imgBarcode.Dispose(); }

Barcode Professional for ASP.NET使用教程：指定区域条码的显示