Home > Developer > Web Develop

Barcode Professional for ASP. NET use Tutorial: How to display high-definition barcodes within the DPI range of HTML support

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

We know that high-quality barcodes are better for our purposes, but the image dpi is proportional to the size of the image, the higher the DPI, the larger the picture file.

It may be easy for you to display a 600DPI picture in HTML, but you'll find that the picture fills the entire page because most of the HTML display resolution is 96DPI. Then today will be shared with barcode Professional for ASP. NET displays high-definition barcodes within the DPI range of HTML support. The code is for informational purposes only.

Note: We are using Visual Studio 2005 (Visual Web Developer), but some vs.net are also available.

Steps :

    • Create an ASP. NET Web Project with Visual Studio 2005.
    • Delete all the ASPX files created in the project.
    • If there is a need to create a bin folder, add a reference to barcode Professional for ASP. NET collection.
    • Add a new project type naming barcodegen.ashx in generic Handler.
    • Enter the following code in the Barcodegen.ashx file using the ProcessRequest method, which will get the 128-yard symbol encoding value and the output barcode image resolution through a string query.

Vb

1 DimDpi as  Single=96.02  3  Try4DPI = Single. Parse (context. Request.QueryString ("DPI"))5  Catch6  7  End Try8  9  DimValuetoencode as String= Context. Request.QueryString ("Valuetoencode")Ten   One  DimBcp as NewNeodynamic.WebControls.BarcodeProfessional.BarcodeProfessional () ABcp. Symbology =Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128 -Bcp. Code =Valuetoencode -   theBcp. BarWidth =0. 01F -Bcp. Barheight =0. 5F -Context. Response.ContentType ="Image/jpeg" -Context. Response.BinaryWrite (bcp. Getbarcodeimage (System.Drawing.Imaging.ImageFormat.Jpeg, DPI))

C#

1 floatDPI =96.0f;2  3  Try4  {5DPI =float. Parse (context. request.querystring["DPI"]);6  }7  Catch8  { }9  Ten  stringValuetoencode = context. request.querystring["Valuetoencode"]; One   ANeodynamic.WebControls.BarcodeProfessional.BarcodeProfessional bcp =NewNeodynamic.WebControls.BarcodeProfessional.BarcodeProfessional (); -Bcp. Symbology =Neodynamic.WebControls.BarcodeProfessional.Symbology.Code128; -Bcp. Code =Valuetoencode; the   -Bcp. BarWidth =0.01f; -Bcp. Barheight =0.5f; -   +Context. Response.ContentType ="Image/jpeg"; -Context. Response.BinaryWrite (bcp. Getbarcodeimage (System.Drawing.Imaging.ImageFormat.Jpeg, DPI));

    • Then add the new item to the HTML page item, this HTML page will display the 600DPI barcode image, this is by using the JS code in other browsers to display the 96DPI HTTP processing. The following code is lost:
1 <!DOCTYPE HTML Public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/TR/xhtml1/DTD/ Xhtml1-transitional.dtd ">2  <HTMLxmlns= "http://www.w3.org/1999/xhtml" >3  <Head>4  <title>HTML Barcode image with DPI support</title>5  <Scripttype= "Text/javascript"> 6  varImageurlgen= "barcodegen.ashx";7  varImageID= "Mybarcodeimage";8  varTxtvaluetoencodeid= "Myvaluetoencode"; 9  varTmpimage;Ten  varDPI=  -; One   A  functioncheckforloadedimage () -  { -  if(Tmpimage.complete) the  { -  varimg=document.getElementById (ImageID); - Img.width=Tmpimage.width*  the /dpi; - Img.height=Tmpimage.height*  the /dpi; + img.src=tmpimage.src; - Cleartimeout ("checkforloadedimage ()"); +  } A  Else at  { - setTimeout ("Checkforloadedimage ()", -); -  }  -  } -   -  functiongetbarcodeimage () in  { -  varValuetoencode=document.getElementById (Txtvaluetoencodeid). value; to Tmpimage= NewImage (); + tmpimage.src=Imageurlgen+ "? valuetoencode="  +Valuetoencode+ "&dpi=" +dpi; - checkforloadedimage (); the  }  *  </Script> $  </Head>Panax Notoginseng  <Body> -  <P> the  <b>Barcode Professional in a HTML page with DPI support</b> +  </P> A  <P> the  <imgID= "Mybarcodeimage"alt=""src="" /> +  </P> -  <P> $Enter a value to encode:<BR/> $  <inputID= "Myvaluetoencode"type= "text"name= "Myvaluetoencode" /> -  </P> -  <P> the  <inputID= "Button1"type= "button"value= "Get Barcode at ..." - name= "Button1"onclick= "Getbarcodeimage ()" />Wuyi  </P> the  </Body> - </HTML>

Completed, although the image size is generated by the JS code, but the quality of the generated image is consistent with the printing results.

Barcode Professional for ASP. NET use Tutorial: How to display high-definition barcodes within the DPI range of HTML support

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
how to use form within form in html how to use dataset in asp net how to use in asp net asp net barcode reader why to use asp net how to use iis server in asp net how to use server transfer in asp net

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More