ComponentOne Bitmap for WinForms
In This Topic
    Quick Start
    In This Topic

    This quick start section gets you started with using Bitmap for loading an image. You begin by creating a WinForms application in Visual Studio, adding a sample image to your application, and adding code to load the sample image in a picture box using Bitmap. The code given in this section illustrates loading an image into bitmap through a stream object.

    Complete the steps given below to see how Bitmap can be used to load an image in a picture box.

    1. Setting up the application and adding a sample image
    2. Adding code to load image using Bitmap

    The following image shows how the application displays an image loaded in bitmap on a button click.

    Load image on a button click using ComponentOne Bitmap for WinForms

    Step 1: Setting up the application and adding a sample image

    1. Create a WinForms application in Visual Studio.
    2. Add the following references to your application.
      • C1.Win.4
      • C1.Win.Bitmap.4.5.2
      • C1.Win.C1DX.4.5.2
    3. In the Solution Explorer, right click your project name and select Add | New Folder and name it as 'Resources'.
    4. In Visual Studio, add a sample image to the Resources folder and set its Build Action property to Embedded Resource from the Properties pane.
    5. Add a standard Button control for loading a sample image on button click, and a PictureBox control for displaying the sample image onto the Form.
    6. Set the Text property of the button to a suitable text from the Properties pane.
    7. Set the SizeMode property of the picture box to StretchImage from the Properties pane.

    Step 2: Adding code to load image using Bitmap

    1. Switch to the code view and add the following import statements.
      Imports C1.Win.Bitmap
      Imports C1.Util.DX
      Imports System.Reflection
      Imports System.IO
      
      using C1.Win.Bitmap;
      using C1.Util.DX;
      using System.Reflection;
      using System.IO;
      
    2. Initialize a bitmap in the Form1 class.
      'Initialize a Bitmap
      Dim bitmap As New C1Bitmap()
      
      //Initialize a Bitmap
      C1Bitmap bitmap = new C1Bitmap();
      
    3. Subscribe a button click event and add the following code for loading the sample image into bitmap from a stream object.
      'Load image through stream on button click
      Private Sub Btn_Load_Click(sender As Object, e As EventArgs) Handles Btn_Load.Click
          Dim t As Type = Me.GetType
          Dim asm As Assembly = t.Assembly
          Dim stream As Stream = asm.GetManifestResourceStream(t, "GrapeCity.png")
          bitmap.Load(stream, New FormatConverter(PixelFormat.Format32bppPBGRA))
          UpdateImage()
      End Sub
      
      //Load image through stream on button click 
      private void button1_Click(object sender, EventArgs e)
      {
          Assembly asm = typeof(Form1).Assembly;
          using (Stream stream = asm.GetManifestResourceStream
              ("LoadBitmapStream.Resources.GrapeCity.png"))
          {
              bitmap.Load(stream, 
                  new FormatConverter(PixelFormat.Format32bppPBGRA));                
          }
      
          UpdateImage();
      }
      
    4. Add the following code to define UpdateImage method for displaying the image in the picture box.
      'Display the image loaded in bitmap 
      Private Sub UpdateImage()
          Dim bmp = pictureBox1.Image
          bmp = bitmap.ToGdiBitmap()
          pictureBox1.Image = bmp
          pictureBox1.Width = bmp.Width
          pictureBox1.Height = bmp.Height
      
      End Sub
      
      //Display the image loaded in bitmap 
      private void UpdateImage()
      {
          var bmp = pictureBox1.Image as Bitmap;
          bmp = bitmap.ToGdiBitmap();
          pictureBox1.Image = bmp;                     
      }
      
    See Also