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Create QR Code ISO/IEC18004 in C#.NET Writing Copyright Notes on Images

Writing Copyright Notes on Images
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The .NET Framework graphic engine supports quite a few image formats, including JPEG, GIF, BMP, and PNG. The whole collection of image formats is in the ImageFormat structure of the System.Drawing namespace. You can save a memory-resident Bitmap object to any of the supported formats by using one of the overloads of the Save method:
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Bitmap bmp = new Bitmap(file); ... bmp.Save(outputStream, ImageFormat.Gif);
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When you attempt to save an image to a stream or disk file, the system attempts to locate an encoder for the requested format. The encoder is a module that converts from the native format to the specified format. Note that the encoder is a piece of unmanaged code that lives in the underlying Win32 platform. For each save format, the Save method looks up the right encoder and proceeds. The next example wraps up all the points we ve touched on. This example shows how to load an existing image, add some copyright notes, and serve the modified version to the user. In doing so, we ll load an image into a Bitmap object, obtain a Graphics for that bitmap, and use graphics primitives to write. When finished, we ll save the result to the page s output stream and indicate a particular MIME type.
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Part I The ASP.NET Runtime Environment
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The sample page that triggers the example is easily created, as shown in the following listing:
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<html> <body> <img id="picture" src="dynimage.axd url=images/pic1.jpg" /> </body> </html>
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The page contains no ASP.NET code and displays an image through a static HTML <img> tag. The source of the image, though, is an HTTP handler that loads the image passed through the query string and then manipulates and displays it. Here s the source code for the ProcessRequest method of the HTTP handler:
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public void ProcessRequest (HttpContext context) { var o = context.Request["url"]; if (o == null) { context.Response.Write("No image found."); context.Response.End(); return; } var file = context.Server.MapPath(o); var msg = ConfigurationManager.AppSettings["CopyrightNote"]; if (File.Exists(file)) { Bitmap bmp = AddCopyright(file, msg); context.Response.ContentType = "image/jpeg"; bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg); bmp.Dispose(); } else { context.Response.Write("No image found."); context.Response.End(); } }
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Note that the server-side page performs two different tasks indeed. First, it writes copyright text on the image canvas; next, it converts whatever the original format was to JPEG:
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Bitmap AddCopyright(String file, String msg) { // Load the file and create the graphics var bmp = new Bitmap(file); var g = Graphics.FromImage(bmp); // Define text alignment var strFmt = new StringFormat(); strFmt.Alignment = StringAlignment.Center; // Create brushes for the bottom writing // (green text on black background) var btmForeColor = new SolidBrush(Color.PaleGreen); var btmBackColor = new SolidBrush(Color.Black);
4 HTTP Handlers, Modules, and Routing
// To calculate writing coordinates, obtain the size of the // text given the font typeface and size var btmFont = new Font("Verdana", 7); var textSize = g.MeasureString(msg, btmFont); // Calculate the output rectangle and fill float x = (bmp.Width-textSize.Width-3); float y = (bmp.Height-textSize.Height-3); float w = (x + textSize.Width); float h = (y + textSize.Height); var textArea = new RectangleF(x, y, w, h); g.FillRectangle(btmBackColor, textArea); // Draw the text and free resources g.DrawString(msg, btmFont, btmForeColor, textArea); btmForeColor.Dispose(); btmBackColor.Dispose(); btmFont.Dispose(); g.Dispose(); return bmp; }
Figure 4-6 shows the results.
FIGURE 4-6 A server-resident image has been modified before being displayed.
Part I The ASP.NET Runtime Environment
Note that the additional text is part of the image the user downloads on her client browser. If the user saves the picture by using the Save Picture As menu from the browser, the text (in this case, the copyright note) is saved along with the image. Important All examples demonstrating programmatic manipulation of images take advantage of the classes in the System.Drawing assembly. The use of this assembly is not recommended in ASP.NET and is explicitly not supported in ASP.NET Web services. (See http://msdn.microsoft.com/ en-us/library/system.drawing.aspx.) This fact simply means that you are advised not to use classes in System.Drawing because Microsoft can t guarantee it is always safe to use them in all possible scenarios. If your code is currently using System.Drawing the GDI+ subsystem and it works just fine, you re probably OK. In any case, if you use GDI+ classes and encounter a malfunction, Microsoft will not assist you. Forewarned is forearmed.
You might be better off using an alternative to GDI+, especially for new applications. Which one For both speed and reliability, you can consider the WPF Imaging API. Here s an interesting post that shows how to use Windows Presentation Foundation (WPF) for resizing images: http:// weblogs.asp.net/bleroy/archive/2010/01/21/server-side-resizing-with-wpf-now-with-jpg.aspx.
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