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For Each f In fi ListBox1.Items.Add( _ New ListItem(f.Name, f.FullName)) Next End If End Sub
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7. Add code to the ListBox s SelectedIndexChanged method to deliver the file to the user. Your code should look like the following:
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Private Sub ListBox1_SelectedIndexChanged( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles ListBox1.SelectedIndexChanged Dim f As String f = ListBox1.SelectedItem.Value If File.Exists(f) Then Response.Clear() Default to force the save messagebox Response.ContentType = application/octet-stream If String.Compare( _ Path.GetExtension(f), .gif , True) Then Response.ContentType = image/gif End If Response.WriteFile(f) Response.End() Else Response.Write( File not found<br> ) End If End Sub
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8. Check your work back into Visual SourceSafe. Test File Downloading The download can be tested by setting the DownLoadDocument.aspx as the start page and running the application. 1. Right-click the Customer project in the Solution Explorer. Click Set As StartUp Project. 2. Right-click the DownLoadDocument.aspx page. Click Set As Start Page. 3. Run the application. Click some of the files that are in the ListBox.
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Streams, File Access, and Serialization
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Summary
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Using one of the available streams helps to isolate the programmer from the low-level operating system and device details. The File class provides many static classes that perform file manipulation. The FileInfo class requires an instance to be created. The Directory class contains many static methods for accessing and manipulating a directory. The DirectoryInfo class requires an instance to be created. Isolated storage provides a method of storing information on a user s fixed disk without requiring any additional security and without exposing the information to other programs. Serialization is the process of converting an object into a stream of data, which allows the object to be transported.
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Review Questions
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1. What are three of the Stream classes 2. What are three of the Stream helper classes 3. What is the difference between the File and FileInfo class 4. What control can be used to upload files to the Web server 5. How can you save data to the file system without needing to worry about the location and file system type for the data 6. What type of serialization should be used for optimal performance
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Answers to Review Questions
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1. The FileStream, NetworkStream, Null Stream, MemoryStream, CryptoStream, BufferedStream. 2. The BinaryWriter, BinaryReader, TextWriter, TextReader, StreamWriter, StreamReader, HttpWebRequest. 3. The File class uses static methods, whereas the FileInfo class uses instance methods. 4. The File Field HTML control. 5. Use Isolated Storage. 6. Binary Serialization.
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CHAPTER
Working with GDI+ and Images
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Until now, the focus of this book has been on the use of textual data in a Web application. There is often a requirement to work with images, either by storing and retrieving images on the Web server, or by creating images on the fly. This chapter starts by looking at the image and bitmap classes. These classes can be used to work with images, by using most of the techniques that have been defined in previous chapters. The latter part of the chapter looks closely at GDI+ and the ability to create images on the fly. Many of the types that are covered in this chapter are located in the System.Drawing and System.Drawing.Imaging namespaces.
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Classroom Q & A
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Q: Is it possible to upload images to a database A: Yes. This chapter covers uploading images to a database and retrieving images from the database. Q: How difficult is it to rotate or flip an image A: Actually, it s very easy to rotate or flip an image after it s loaded into memory. The Image class contains a RotateFlip method that simplifies this process.
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Q: I have a graphical menu on my site, and I would like to generate on-the-fly text graphics for the menu selections. Is this possible in ASP.NET A: It sure is. This chapter covers the creation of on-the-fly graphics.