Retrieving Images from a Zip File

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In this example, two buttons and a listbox will be used to show how images can be retrieved from a .zip file.

To retrieve images directly from a zip file, first add the following code to compress several image files into a zip file. In this example, the code is added to the btnNew_Click event, which creates a new .zip file for the images when a button is clicked.

Make sure to add these using statements at the top of the code:

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using C1.C1Zip; using Microsoft.Win32; using System.IO;

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public MainWindow() { InitializeComponent(); // Get the application directory. string s = Environment.CurrentDirectory; s = s.Substring(0, s.IndexOf(@"\bin")) + @"\resources"; // Create the zip file. zipFile.Create(s + @"\images.zip"); // Populate the zip file and list. foreach (string f in Directory.GetFiles(s)) { string fname = f.ToLower(); // Skip self. if (fname.EndsWith("zip")) continue; // Add to the list. listBox1.Items.Add(System.IO.Path.GetFileName(fname)); // Add to the zip file. zipFile.Entries.Add(fname); } }

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public MainWindow()
               {
                   InitializeComponent();    
                   // Get the application directory.  
                   string s = Environment.CurrentDirectory;  
                   s = s.Substring(0, s.IndexOf(@"\bin")) + @"\resources";   
                   // Create the zip file.  
                   zipFile.Create(s + @"\images.zip");                 
                   // Populate the zip file and list.  
                   foreach (string f in Directory.GetFiles(s))  
                   {       
                       string fname = f.ToLower();                            
                       // Skip self.      
                       if (fname.EndsWith("zip"))
                           continue;      
                       // Add to the list.       
                       listBox1.Items.Add(System.IO.Path.GetFileName(fname));     
                       // Add to the zip file.      
                       zipFile.Entries.Add(fname);
                   }
               }

To allow you to select an image, retrieve a stream with the image data (OpenReader method), and add the following code to the listBox1_SelectionChanged and StreamCopy events:

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private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e) { // Get the selected item. string item = (string)listBox1.SelectedItem; // Load the image directly from a compressed stream. var stream = zipFile.Entries[item].OpenReader(); BitmapImage img = new BitmapImage(); img.BeginInit(); img.StreamSource = stream; img.EndInit(); this.image1.Source = img; }

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private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
               {
                   // Get the selected item.
                   string item = (string)listBox1.SelectedItem;
                   // Load the image directly from a compressed stream.
                   var stream = zipFile.Entries[item].OpenReader();     
                   BitmapImage img = new BitmapImage();
                   img.BeginInit();
                   img.StreamSource = stream;
                   img.EndInit();
                   this.image1.Source = img;
               }

This topic illustrates the following:

This example shows several types of images, including ICO, TIFF, BMP, and JPG images.

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