Loading an Image From a Buffer

Take the following steps to start a project and to add some code that loads and displays an image from a buffer:

1. Start Visual Studio .NET.
2. Choose File->New->Project… from the menu.
3. In the New Project dialog box, choose either "Visual C# Projects" or "VB Projects" in the Projects Type List, and choose "Windows Application " in the Templates List.
4. Type the project name as "Loading an Image From a Buffer" in the Project Name field, and then click OK. If desired, type a new location for your project or select a directory using the Browse button, and then click OK .

5. In the "Solution Explorer" window, right-click on the "References" folder, and select "Add Reference…" from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and browse to Leadtools For .NET "<LEADTOOLS_INSTALLDIR>\Bin\DotNet4\Win32 " folder and select the following DLLs:

   • Leadtools.dll
   • Leadtools.Codecs.dll
   • Leadtools.Controls.WinForms.dll
   • Leadtools.Codecs.Cmp.dll

   Click the Select button and then press the OK button to add the above DLLs to the application.

6. Make sure Form1 is in design view. Go to the toolbox (View->Toolbox) and Drag and drop an instance of ImageViewer to the form. If you do not have ImageViewer in your toolbox, select Tools->Add Remove Toolbox Items from the menu. Click Browse and then select Leadtools.Controls.WinForms.DLL from "<LEADTOOLS_INSTALLDIR>\Bin\DotNet4\Win32" and then click Open and then click OK.

7. Switch to Form1 code view (right-click Form1 in the solution explorer then select View Code ) and add the following lines at the beginning of the file:

   VB

   Imports System.IO 
   Imports Leadtools 
   Imports Leadtools.Codecs 
   Imports Leadtools.Controls.WinForms 
                    
        

   C#

   using System.Runtime.InteropServices; 
   using System.IO; 
   using Leadtools; 
   using Leadtools.Codecs; 
   using Leadtools.Controls.WinForms; 
                    
        

8. Add an event handler to the Form1 Load event and add the following code:

   VB

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventA) Handles MyBase.Load 
      ' Initialize a new RasterCodecs object 
      Dim codecs As New RasterCodecs() 
      Dim fileName As String = "C:\Users\Public\Documents\LEADTOOLS Images\Image1.cmp" 
      ' Load the file data into a byte array 
      Dim buffer() As Byte = File.ReadAllBytes(fileName) 
      ' Load it 
      Dim ms As New MemoryStream(buffer) 
      Dim image As RasterImage = codecs.Load(ms) 
      MessageBox.Show(String.Format("Loaded, image size is {0} by {1} pixels", image.ImageWidth, image.ImageHeight)) 
      image.Dispose() 
      ms.Dispose() 
   End Sub 
                    
        

   C#

   unsafe private void Form1_Load(object sender, System.EventArgs e) 
   { 
      // Initialize a new RasterCodecs object 
      RasterCodecs codecs = new RasterCodecs(); 
      string fileName = @"C:\Users\Public\Documents\LEADTOOLS Images\Image1.cmp"; 
      // Load the file data into a byte array 
      byte[] buffer = File.ReadAllBytes(fileName); 
      // Load it 
      MemoryStream ms = new MemoryStream(buffer); 
      RasterImage image = codecs.Load(ms); 
      MessageBox.Show(string.Format("Loaded, image size is {0} by {1} pixels", image.ImageWidth, image.ImageHeight)); 
      image.Dispose(); 
      ms.Dispose(); 
      // Load the file data into an unmanaged pointer 
      IntPtr ptr = Marshal.AllocHGlobal(buffer.Length); 
      Marshal.Copy(buffer, 0, ptr, buffer.Length); 
      // Load it 
      UnmanagedMemoryStream ums = new UnmanagedMemoryStream((byte*)ptr.ToPointer(), buffer.Length); 
      image = codecs.Load(ums); 
      MessageBox.Show(string.Format("Loaded, image size is {0} by {1} pixels", image.ImageWidth, image.ImageHeight)); 
      image.Dispose(); 
      ums.Dispose(); 
      Marshal.FreeHGlobal(ptr); 
   } 
                    
        

9. Build, and Run the program to test it.