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a. Use the label Default Albums. b. Set the image indices to use the album directory icon. c. Add the node as a root of the tree. d. Select this node by default. 5 Create a node for each album file in the default album directory. Create a new TreeNode for this album using the base file name as the label text for the node. Create a child node in each album node with the label text child. Set the Tag property for the node to contain the album file path.

#include <iostream> #include <iomanip> using namespace std; main() { cout << setiosflags(ios::showpos); cout << setiosflags(ios::scientific); cout << 123 << " " << 12323; return 0; }

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foreach (string s in Directory.GetFiles( PhotoAlbum.DefaultDir, "*.abm")) { // Create a node for this album String baseName = Path. GetFileNameWithoutExtension(s); TreeNode albumNode = new TreeNode(baseName, new TreeNode[] { new TreeNode("child") }); albumNode.Tag = s;

#include <iostream> using namespace std; int main() { char s[80]; cin >> ws >> s; cout << s; }

In addition to overloading the insertion and extraction operators, you can further customize C++ s I/O system by creating your own manipulator functions Custom manipulators are important for two main reasons First, you can consolidate a sequence of several separate I/O operations into one manipulator For example, it is not uncommon to have situations in which the same sequence of I/O operations occurs frequently within a program In these cases you can use a custom manipulator to perform these actions, thus simplifying your source code and preventing accidental errors A custom

Note: We will use the Tag property to identify the album related to a specified node when handling events for the TreeView control.

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manipulator can also be important when you need to perform I/O operations on a nonstandard device For example, you might use a manipulator to send control codes to a special type of printer or to an optical recognition system Custom manipulators are a feature of C++ that supports OOP, but they also can benefit programs that aren t object oriented As you will see, custom manipulators can help make any I/O-intensive program clearer and more efficient As you know, there are two basic types of manipulators: those that operate on input streams and those that operate on output streams In addition to these two broad categories, there is a secondary division: those manipulators that take an argument and those that don t Here, the creation of parameterless manipulators is described, since they are the most common type of custom manipulator All parameterless manipulator output functions have this skeleton: ostream &manip-name(ostream &stream) { // your code here return stream; } Here, manip-name is the name of the manipulator It is important to understand that even though the manipulator has as its single argument a reference to the stream upon which it is operating, no argument is used when the manipulator is inserted in an output operation The following program creates a manipulator called setup( ) that turns on leftjustification, sets the field width to 10, and specifies the dollar sign as the fill character

defaultRoot.Nodes.Add(albumNode); } treeViewMain.EndUpdate(); }

#include <iostream> #include <iomanip> using namespace std; ostream &setup(ostream &stream) { streamsetf(ios::left); stream << setw(10) << setfill('$'); return stream; } int main() { cout << 10 << " " << setup << 10; return 0; }

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All parameterless manipulator input functions have this general form: istream &manip-name(istream &stream) { // your code here return stream; } For example, this program creates the prompt( ) manipulator, which displays a prompting message and then switches numeric input to hexadecimal:

Add the new node to the collection of nodes under the default root node. Allow the TreeView to repaint by calling the EndUpdate method.

#include <iostream> #include <iomanip> using namespace std; istream &prompt(istream &stream) { cin >> hex; cout << "Enter number using hex format: "; return stream; } int main() { int i; cin >> prompt >> i; cout << i; return 0; }

This code uses a few tricks to ensure that our application will perform as expected. When a new album node is created, a single child node is added to ensure that the TreeView control will allow the node to be expanded.

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It is crucial that your manipulator return the stream If this is not done, then your manipulator cannot be used in a larger I/O statement As you work with C++, you will find that custom manipulators can help streamline your I/O statements