how to generate and print barcode in c# windows application Estimated lesson time: 30 minutes in C#

Creation Denso QR Bar Code in C# Estimated lesson time: 30 minutes

Estimated lesson time: 30 minutes
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The Image and Bitmap Classes
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The System.Drawing.Image abstract class gives you the ability to create, load, modify, and save images such as .BMP files, .JPG files, and .TIF files. Some useful things you can do with the Image class include:
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Create a drawing or chart, and save the results as an image file. Use text (as described in Lesson 3) to add copyright information or a watermark to a picture. Resize JPEG images so that they consume less space and can be downloaded faster.
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The Image class is abstract, but you can create instances of the classing using the Image.FromFile (which accepts a path to an image file as a parameter) and Image.FromStream (which accepts a System.IO.Stream object as a parameter) methods. You can also use two classes that inherit Image: System.Drawing.Bitmap for still images, and System.Drawing.Imaging.Metafile for animated images. Bitmap is the most commonly used class for working with new or existing images. The different constructors allow you to create a Bitmap from an existing Image, file, or stream, or to create a blank bitmap of a specified height and width. Bitmap contains two particularly useful methods that Image lacks:
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GetPixel Returns a Color object describing a particular pixel in the image. A pixel is a single colored dot in the image, consisting of a red, green, and blue component. SetPixel Sets a pixel to the specified color.
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Lesson 2: Working with Images
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However, more complex image editing requires you to create a Graphics object by calling Graphics.FromImage.
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How to Display Pictures
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To display an image that is saved to the disk in a form, load it with Image.FromFile and create a PictureBox control, and then use the Image to define PictureBox.BackgroundImage. The following sample code (which requires a form with an instance of PictureBox named pictureBox1) demonstrates this process:
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' VB Dim I As Image = Image.FromFile("C:\windows\gone fishing.bmp") PictureBox1.BackgroundImage = I // C# Image i = Image.FromFile(@"C:\windows\gone fishing.bmp"); pictureBox1.BackgroundImage = i;
Similarly, the following code accomplishes the same thing using the Bitmap class:
' VB Dim B As Bitmap = Image.FromFile("C:\windows\gone fishing.bmp") PictureBox1.BackgroundImage = B // C# Bitmap b = new Bitmap(@"C:\windows\gone fishing.bmp"); pictureBox1.BackgroundImage = b;
Alternatively, you can display an image as the background for a form or control by using the Graphics.DrawImage method. This method has 30 overloads, so you have a wide variety of options for how you specify the image location and size. The following code uses this method to set an image as the background for a form, no matter what the dimensions of the form are:
' VB Dim Bm As Bitmap = New Bitmap("C:\WINDOWS\Web\Wallpaper\Azul.jpg") Dim G As Graphics = Me.CreateGraphics G.DrawImage(Bm, 1, 1, Me.Width, Me.Height) // C# Bitmap bm = new Bitmap(@"C:\WINDOWS\Web\Wallpaper\Azul.jpg"); Graphics g = this.CreateGraphics(); g.DrawImage(bm, 1, 1, this.Width, this.Height);
How to Create and Save Pictures
To create a new, blank picture, create an instance of the Bitmap class with one of the constructors that does not require an existing image. You can then edit it using
6
Graphics
the Bitmap.SetPixel method, or you can call Graphics.FromImage and edit the image using the Graphics drawing methods. To save a picture, call Bitmap.Save. This method has several easy-to-understand overloads. Two of the overloads accept a parameter of type System.Drawing.Imaging.ImageFormat, for which you should provide one of the following properties to describe the file type: Bmp, Emf, Exif, Gif, Icon, Jpeg, MemoryBmp, Png, Tiff, or Wmf. Jpeg is the most common format for photographs, and Gif is the most common format for charts, screen shots, and drawings. For example, the following code creates a blank 600-by-600 Bitmap, creates a Graphics object based on the Bitmap, uses the Graphics.FillPolygon and Graphics.DrawPolygon methods to draw a shape in the Bitmap, and then saves it to a file named bm.jpg in the current directory. This code can run as a console application, and it requires the System.Drawing.Drawing2D and System.Drawing.Imaging namespaces.
' VB Dim Bm As Bitmap = New Bitmap(600, 600) Dim G As Graphics = Graphics.FromImage(bm) Dim B As Brush = New LinearGradientBrush(New Point(1, 1), New Point(600, 600), _ Color.White, Color.Red) Dim Points As Point() = New Point() {New Point(10, 10), _ New Point(77, 500), _ New Point(590, 100), _ New Point(250, 590), _ New Point(300, 410)} G.FillPolygon(B, Points) Bm.Save("bm.jpg", ImageFormat.Jpeg) // C# Bitmap bm = new Bitmap(600, 600); Graphics g = Graphics.FromImage(bm); Brush b = new LinearGradientBrush(new Point(1, 1), new Point(600, 600), Color.White, Color.Red); Point[] points = new Point[] {new Point(10, 10), new Point(77, 500), new Point(590, 100), new Point(250, 590), new Point(300, 410)}; g.FillPolygon(b, points); bm.Save("bm.jpg", ImageFormat.Jpeg);
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