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Note: As in chapter 1, the ampersand (&) is used to indicate the access key for the button. Also notice that the TabIndex property for this control is set to 1, since it was the first control added to the form.

When run, the program produces this output:

RENAME THE CONTROLS AND DEFINE THEIR PROPERTIES Action 10 Display the PictureBox control properties.

0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 1 0 0 1 0 0 0 0 0 0 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 0

6665 6677

You can select the pictureBox1 entry from the dropdown list at the top of the Properties window. 11 12 Set the (Name) property to pbxPhoto . Set the BorderStyle property to Fixed3D. Note: The BorderStyle property is displayed as a dropdown list since this property is based on a fixed set of values, in this case those taken from the BorderStyle enumeration.

In addition to the formatting flags, you can also set a stream s field width, the fill character, and the number of digits displayed after a decimal point, using these functions: streamsize width(streamsize len); char fill(char ch); streamsize precision(streamsize num); The width( ) function returns the stream s current field width and sets the field width to len By default the field width varies, depending upon the number of characters it takes to hold the data The fill( ) function returns the current fill character, which is a space by default, and makes the current fill character the same as ch The fill character is the character used to pad output to fill a specified field width The precision( ) function returns the number of digits displayed after a decimal point and sets that value to num The streamsize type is defined as some form of integer

Here is a program that demonstrates these three functions:

Click the title bar of the form, or select the MainForm entry from the dropdown list. 14 Set the Text property to MyPhotos This setting immediately appears in the title bar of the form in the designer window. Note: We already added code to assign a new title bar in the constructor of our class, but it s nice to have a default title bar regardless.

#include <iostream> using namespace std; int main() { coutsetf(ios::showpos); coutsetf(ios::scientific); cout << 123 << " " << 12323 << "\n"; coutprecision(2); // two digits after decimal point coutwidth(10); // in a field of ten characters cout << 123 << " " << 12323 << "\n"; coutfill('#'); // fill using # coutwidth(10); // in a field of ten characters cout << 123 << " " << 12323; return 0; }

B-18

Before we compile and run this code, let s check out the MainForm.cs source code generated by Visual Studio .NET to see how this code has changed in response to our actions. Take a look at the region marked Windows Form Designer generated code in the source file. You may need to click the plus (+) sign in front of this region to display this block of code. This region defines the InitializeComponent method where properties and other settings are defined. Your code should look something like this:

The program displays this output:

#region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary>

Remember, each stream maintains its own set of format flags Changing the flag settings of one stream does not affect another stream

Table B10 ISO 639 Language Codes (continued)

The C++ I/O system includes a second way to alter the format parameters of a stream This way uses special functions called manipulators, which can be included in an I/O expression The standard manipulators are shown in Table 24-1 To use the manipulators that take parameters, you must include <iomanip> in your program

// Create a node for each album file foreach (string s in Directory.GetFiles( PhotoAlbum.DefaultDir, "*.abm")) { String baseName = Path.GetFileNameWithoutExtension(s); TreeNode albumNode = new TreeNode(baseName) defaultRoot.Nodes.Add(albumNode); // Open the album PhotoAlbum album = OpenAlbum(s); if (album == null) { // Bad album, so adjust the image index settings albumNode.ImageIndex = ErrorIndex; albumNode.SelectedImageIndex = ErrorIndex; continue; } // Create a node for each photo in this album foreach (Photograph p in album) { string text = album.GetDisplayText(p); TreeNode photoNode = new TreeNode(text, PhotoIndex, SelectedPhotoIndex); albumNode.Nodes.Add(photoNode); } album.Dispose(); } treeViewMain.EndUpdate(); }

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