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Save WebControls.Image to a file or to system.drawings.image

Posted on 2011-09-21
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Last Modified: 2012-05-12
I am generating USPS barcode images so they can be printed to an address label and shipped. I purchased an ASP.Net USPS barcode image creator so It creates the image in an ASP WebControls.Image control. But when its time to print, the only thing i can send to the printer from C# is a system.drawings.image object:

//Get the default printer name.
                var prnDocument = new PrintDocument { PrinterSettings = { PrinterName = printer } };
                              prnDocument.PrintPage += PrintOrderLabels;
                prnDocument.Print();


  private void PrintOrderLabels(object sender, PrintPageEventArgs e)
        {
      var fnt = new Font(FontFamily.GenericSerif, 14);
 float yPos = 1;
            float xPos = 15;
            e.Graphics.DrawString("Big D, Tx", fnt, Brushes.Black, 1, yPos);
            e.Graphics.DrawImage(barcode,xPos,yPos); //barcode is a webcontrols.image so this wont compile
}

The  e.Graphics.DrawImage function only accepts an object of type system.drawings.image. So how can I:

A. convert a webcontrols.image control to a system.drawings.image object? (i dont think you can unless the image is physically on the hard drive)

B. Save the webcontrols.image object to a file on the server and retrieve it from there

or

C.  send the web image to the printer along with my other string data?


Thanks.
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Question by:troycomp
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8 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 36577981
Are you saying that you have a web site with an <asp:Image> control, and you need to download the image from the web site, and print it using a separate application?  That sounds like a job for the System.Net.WebClient or HttpWebRequest to get the byte array, and convert it to an image.
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Author Comment

by:troycomp
ID: 36578266
yes i have a site with an <asp:image> control...but the same site has a print label button which prints to a local printer, this is an intranet site by the way. I can print text no problem, but the barcode is an <asp:image>. how do I print that like i outlined above?
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LVL 96

Expert Comment

by:Bob Learned
ID: 36580525
If this is all happening within the same web site, what is the source for the Image control?  If it is a file, then you might be able to use Image.FromFile(Server.MapPath(path)) to read the file into a System.Drawing.Image structure.
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Author Comment

by:troycomp
ID: 36580948
The image is generated from a 3rd party app. It is never ever stored on my server. Its dynamically created and then returned in an <asp:image>  with an ImageUrl of "linear.aspx?data=38&type=50".  go to:
http://troycomptonworld.com/barcode/LinearWebStreamDemo.aspx for an example. The image at the top of the page is what im trying to capture so i can print it to an address label. Its being created with this call in linear.aspx:

<%@ Page Language="C#" %>
<%@ Import Namespace="BarcodeLib.Barcode.Linear" %>
<%
      LinearWebStream.drawBarcode(Request, Response);
   
%>
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LVL 96

Expert Comment

by:Bob Learned
ID: 36581127
If you have a URL to the image, then you should be able to use the WebClient to download the byte array, to construct an image, or download the file.

Download Files from Web [C#]
http://www.csharp-examples.net/download-files/

WebClient webClient = new WebClient();
webClient.DownloadFile("http://mysite.com/myfile.txt", @"c:\myfile.txt");

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Author Comment

by:troycomp
ID: 36581703
I cant do it that way. I get "Illegal characters in path" :

 barcodeImage.ImageUrl = "linear.aspx?Data=75215187103&Type=38";
            var webClient = new WebClient();
            webClient.DownloadFile(barcodeImage.ImageUrl, @"c:\myfile.png");
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LVL 96

Accepted Solution

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Bob Learned earned 2000 total points
ID: 36581719
It needs to be a fully-qualified URL, with http://, so it can figure out the protocol.
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Author Comment

by:troycomp
ID: 36581754
Bless you. That worked like a charm
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