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Barcodes on ASP.NET pages
Select on of the link below to see one of the dBarcode.NET components on an ASP.NET page
dBarcode.NET Dual Universal
dBarcode.NET GS1-Composite
dBarcode.NET components can generate barcode images in BMP, EPS, GIF, PNG, JPG, TIF and WMF formats, and for more than 60 barcode types. dBarcode.NET components are also used in our Barcodes Online service
Using a dBarcode.NET component
One method, suitable for use when the barcode is to be data-dependent, is to use two aspx files, one which creates a memorystream barcode image using one of the dLSoft dBarcode.NET components and then uses a dummy ASP.NET page as the SRC for an IMG tag to display the image at the correct size, eg.
<script type="text/vb" runat="server">
sub Page_Load(Sender As Object, E As EventArgs)
…………………..
m_barcode.Unit = GraphicsUnit.Inch
m_barcode.XUnit = 0
m_barcode.Font=m_Font
m_barcode.Orientation=0
m_barcode.AutoCheckdigit=TRUE
m_barcode.BarcodeHeight = tht ' desired height in inches
m_barcode.BarcodeWidth = twd ' desired width in inches
m_barcode.CodeTypeValue = 8
m_barcode.caption = Session("xx")
' this example creates barcodes at 300 pixels per inch
Session("ms")=m_barcode.sBarcode(300,300,System.Drawing.Imaging.ImageFormat.Png)
if Session("ms").Length>0 then
Session("ht")=m_barcode.ImageHeight*96/300 ' adjust size for the desired image
resolution
Session("wd")=m_barcode.ImageWidth*96/300
end if
</script>
</head>
<BODY>
<H1>dLSoft dBarcode.NET - on ASP.NET</H1>
<IMG SRC="page2.aspx" HEIGHT=" <% =Session("ht") %> " WIDTH=" <% =Session("wd")
%> ">
<p> dBarcode.NET components can generate barcode images in BMP, GIF, PNG, JPG,
TIF and WMF formats, and for more than 50 barcode types.
</BODY>
</HTML>
The Session variables ht and wd contain the actual sizes at which the barcode
image is to be drawn on the web page. These are calculated when the page is
loaded and used when the IMG SRC calls the second page.
The second file (page2.aspx) serves up the image at the correct size, eg.
<%@ LANGUAGE="VB"%>
<%
Response.ContentType="image/png"
Response.BinaryWrite(Session("ms").GetBuffer())
%>