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In the program, an array of bytes called storage is created This array is then used as the underlying storage for a MemoryStream called memstrm From memstrm are created a StreamReader called memrdr and a StreamWriter called memwtr Using memwtr, output is written to the memory-based stream Notice that after the output has been written, Flush( ) is called on memwtr This is necessary to ensure that the contents of memwtr s buffer are actually written to the underlying array Next, the contents of the underlying byte array are displayed manually, using a foreach loop Then, using Seek( ), the file pointer is reset to the start of the stream, and the memory stream is read using memrdr Memory-based streams are quite useful in programming For example, you can construct complicated output in advance, storing it in the array until it is needed This technique is especially useful when programming for a GUI environment, such as Windows You can also redirect a standard stream to read from an array This might be useful for feeding test information into a program, for example

If you look in the MyPhotos project directory in the file system, you will see a MainForm.resx file in which the icon data is specified. As we discussed in section 12.3, this is compiled into the MyPhotos.MainForm.resources file when the program is compiled, and the data from this file is included in the MainForm.exe executable assembly for the program. In a similar manner, we can assign an icon for the PixelDlg form in the project.

For some applications, it might be easier to use a string rather than a byte array for the underlying storage when performing memory-based I/O operations When this is the case, use StringReader and StringWriter StringReader inherits TextReader, and StringWriter inherits TextWriter Thus, these streams have access to methods defined by those two classes For example, you can call ReadLine( ) on a StringReader and WriteLine( ) on a StringWriter The constructor for StringReader is shown here: StringReader(string str)

14:

Compile and run the application to verify that these icons now appear on their respective forms This method can be used to assign an existing icon to any form Of course, a custom icon can be created and assigned to a form as well We discuss this in the next section At times you may prefer that an icon not appear in a form The ControlBox property for the Form class removes the icon as well as the system menu and its shortcuts from the title bar As an alternate method, we saw in chapter 8 how setting the form s FormBorderStyle property to FixedDialog removes the icon without affecting the presence of the system menu Either technique may be used in your applications, depending on the desired behavior 124.

Here, str is the string that will be read from StringWriter defines several constructors Here is the one that we will use: StringWriter( ) This constructor creates a writer that will put its output into a string This string (in the form of a StringBuilder) is automatically created by StringWriter You can obtain the contents of this string by calling ToString( ) Here is an example that uses StringReader and StringWriter:

2 REPLACING THE APPLICATION ICON You might think that the icon for the application is based on the icon assigned to the main form, namely the form containing the Main entry point for the assembly A fine notion, but not true In fact, the application icon is totally separate from the icons assigned to any forms within the application One reason for this is that applications will not always contain a main form, and console applications and libraries may not contain any forms at all By default, Visual Studio creates an application icon as part of all Windows Forms projects This is the Appico file we first saw back in chapter 2 Double-clicking on this file in the Solution Explorer window will display the Icon Editor window, and permit the icon to be edited much like we edited bitmaps earlier in the chapter.

// Demonstrate StringReader and StringWriter using System; using SystemIO; class StrRdrDemo { static void Main() { // Create a StringWriter StringWriter strwtr = new StringWriter(); // Write to StringWriter for(int i=0; i < 10; i++) strwtrWriteLine("This is i: " + i); // Create a StringReader StringReader strrdr = new StringReader(strwtrToString()); // Now, read from StringReader string str = strrdrReadLine(); while(str != null) { str = strrdrReadLine(); ConsoleWriteLine(str); } } }

The output is shown here: