需求：
- Barcode Professional for ASP.NETv3.0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。
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：
VB
1 Private Sub SaveBarcode() 2 'Create a Barcode Professional object 3 Dim bcp As New Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional() 4 'Set the barcode symbology to Code 128 5 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128 6 'Set the value to encode 7 bcp.Code = "1234567890" 8 'Barcode dimensions settings 9 bcp.BarHeight = 1.0F 10 bcp.BarWidth = 0.01F 11 'Resolution 12 Dim dpi As Single = 300.0F 13 'Target size in inches 14 Dim targetArea As New System.Drawing.SizeF(1.0F, 0.5F) 15 'Get the barcode image fitting the target area 16 Dim imgBarcode As System.Drawing.Image = bcp.GetBarcodeImage(dpi, targetArea) 17 'Save it on disk in PNG format 18 imgBarcode.Save("C: emparcode128.png", System.Drawing.Imaging.ImageFormat.Png) 19 imgBarcode.Dispose() 20 End Sub
C#
1 private void SaveBarcode() 2 { 3 //Create a Barcode Professional object 4 Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp = new Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional(); 5 //Set the barcode symbology to Code 128 6 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128; 7 //Set the value to encode 8 bcp.Code = "1234567890"; 9 //Barcode dimensions settings 10 bcp.BarHeight = 1.0f; 11 bcp.BarWidth = 0.01f; 12 //Resolution 13 float dpi = 300.0f; 14 //Target size in inches 15 System.Drawing.SizeF targetArea = new System.Drawing.SizeF(1.0f, 0.5f); 16 //Get the barcode image fitting the target area 17 System.Drawing.Image imgBarcode = bcp.GetBarcodeImage(dpi, targetArea); 18 //Save it on disk in PNG format 19 imgBarcode.Save(@"C: emparcode128.png", System.Drawing.Imaging.ImageFormat.Png); 20 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）。
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
VB
1 Private Sub SaveBarcode() 2 'Create a Barcode Professional object 3 Dim bcp As New Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional() 4 'Set the barcode symbology to Code 128 5 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128 6 'Set the value to encode 7 bcp.Code = "1234567890" 8 'Barcode dimensions settings 9 bcp.BarHeight = 1.0F 10 bcp.BarWidth = 0.01F 11 bcp.QuietZoneWidth = 0 12 bcp.DisplayCode = False 13 'Resolution 14 Dim dpi As Single = 300.0F 15 'Target size in inches 16 Dim targetArea As New System.Drawing.SizeF(1.0F, 0.5F) 17 'Get the barcode image fitting the target area 18 Dim imgBarcode As System.Drawing.Image = bcp.GetBarcodeImage(dpi, targetArea) 19 'Save it on disk in PNG format 20 imgBarcode.Save("C: emparcode128_full.png", System.Drawing.Imaging.ImageFormat.Png) 21 imgBarcode.Dispose() 22 End Sub
C#
1 private void SaveBarcode() 2 { 3 //Create a Barcode Professional object 4 Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp = new Neodynamic.WebControls.BarcodeProfessional.BarcodeProfessional(); 5 //Set the barcode symbology to Code 128 6 bcp.Symbology = Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128; 7 //Set the value to encode 8 bcp.Code = "1234567890"; 9 //Barcode dimensions settings 10 bcp.BarHeight = 1.0f; 11 bcp.BarWidth = 0.01f; 12 bcp.QuietZoneWidth = 0; 13 bcp.DisplayCode = false; 14 //Resolution 15 float dpi = 300.0f; 16 //Target size in inches 17 SizeF targetArea = new System.Drawing.SizeF(1.0f, 0.5f); 18 //Get the barcode image fitting the target area 19 System.Drawing.Image imgBarcode = bcp.GetBarcodeImage(dpi, targetArea); 20 //Save it on disk in PNG format 21 imgBarcode.Save(@"C: emparcode128_full.png", System.Drawing.Imaging.ImageFormat.Png); 22 imgBarcode.Dispose(); 23 }
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