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<TITLE>Teach Yourself Visual C++ 6 in 21 Days -- Appendix B -- Answers</TITLE>
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Teach Yourself Visual C++ 6 in 21 Days</H1>
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<H1 ALIGN="CENTER">- B -<BR>
Answers</H1>
<UL>
<LI><A HREF="#Heading1">Day 1</A>
<LI><A HREF="#Heading4">Day 2</A>
<LI><A HREF="#Heading7">Day 3</A>
<LI><A HREF="#Heading10">Day 4</A>
<LI><A HREF="#Heading12">Exercise</A>
<LI><A HREF="#Heading13">Day 5</A>
<LI><A HREF="#Heading16">Day 6</A>
<LI><A HREF="#Heading19">Day 7</A>
<LI><A HREF="#Heading22">Day 8</A>
<LI><A HREF="#Heading25">Day 9</A>
<LI><A HREF="#Heading28">Day 10</A>
<LI><A HREF="#Heading31">Day 11</A>
<LI><A HREF="#Heading34">Day 12</A>
<LI><A HREF="#Heading37">Day 13</A>
<LI><A HREF="#Heading40">Day 14</A>
<LI><A HREF="#Heading43">Day 15</A>
<LI><A HREF="#Heading46">Day 16</A>
<LI><A HREF="#Heading49">Day 17</A>
<LI><A HREF="#Heading52">Day 18</A>
<LI><A HREF="#Heading55">Day 19</A>
<LI><A HREF="#Heading58">Day 20</A>
<LI><A HREF="#Heading61">Day 21</A>
</UL>
<P>
<HR SIZE="4">
<BR>
This appendix provides the answers to the quiz questions and exercises at the end
of each chapter.</P>
<P>
<H2><A NAME="Heading1"></A>Day 1</H2>
<H2>Quiz</H2>
<DL>
<DT></DT>
<DD><B>1. </B>How do you change the caption on a button?
<P>
<DT></DT>
<DD>In the window layout editor, select the button to be changed. Right-click the
mouse and select Properties from the pop-up menu. Change the value in the Caption
field.
<P>
<DT></DT>
<DD><B>2. </B>What can you do with the Visual C++ AppWizard?
<P>
<DT></DT>
<DD>You can use it to build a shell for your application, based on the type of application
and the functionality needs of the application. The shell will have support for the
desired functionality already built in.
<P>
<DT></DT>
<DD><B>3. </B>How do you attach functionality to the click of a button?
<P>
<DT></DT>
<DD>By using the Class Wizard, you can create a function and attach it to an object
for handling a specific Windows message. The Class Wizard creates the function and
can take you right to the spot in the function's code where you need to begin adding
your own code.
<P>
</DL>
<H3>Exercise</H3>
<P>Add a second button to the About window in your application. Have the button display
a different message from the one on the first window.</P>
<DL>
<DT></DT>
<DD><B>1. </B>In the workspace pane, select the Resource View tab.
<P>
<DT></DT>
<DD><B>2. </B>Expand the dialog tree branch and double-click the IDD_ABOUTBOX dialog,
bringing it into the Developer Studio editor.
<P>
<DT></DT>
<DD><B>3. </B>Click the button control on the toolbar.
<P>
<DT></DT>
<DD><B>4. </B>Click and drag the mouse on the window where you want the button to
be placed.
<P>
<DT></DT>
<DD><B>5. </B>Open the properties dialog for the new button, changing the ID and
caption to describe the message to be displayed by the button. Close the properties
dialog.
<P>
<DT></DT>
<DD><B>6. </B>Open the Class Wizard and add a new function for the clicked message
for your new button.
<P>
<DT></DT>
<DD><B>7. </B>Click the Edit Code button in the Class Wizard to take you to the spot
in your code where your new function is.
<P>
<DT></DT>
<DD><B>8. </B>Add the MessageBox function to display a message to the user.
<P>
<DT></DT>
<DD><B>9. </B>Compile and run your application to test your new button.
<P>
</DL>
<H2><A NAME="Heading4"></A>Day 2</H2>
<H3>Quiz</H3>
<DL>
<DT></DT>
<DD><B>1. </B>Why do you need to specify the tab order of the controls on your application
windows?
<P>
<DT></DT>
<DD>By specifying the tab order of the controls on your application windows, you
can control the order in which the user navigates the application window. If the
user is using the keyboard to navigate around the application window, then the two
primary means of navigating between controls are the tab key and mnemonics that jump
directly to specific controls. The tab order helps provide the user with a consistent
and predictable experience when using your application.
<P>
<DT></DT>
<DD><B>2. </B>How can you include a mnemonic in a static text field that will take
the user to the edit box or combo box beside the text control?
<P>
<DT></DT>
<DD>If you place a mnemonic in a static text control and then make sure that the
static text control is just before the edit control associated with the static text,
the user can select the mnemonic in the static text control to jump directly to the
edit box control.
<P>
<DT></DT>
<DD><B>3. </B>Why do you need to give unique object IDs to the static text fields
in front of the edit box and combo boxes?
<P>
<DT></DT>
<DD>The unique object IDs on the two static text controls were necessary because
you need to manipulate those two controls with the check boxes that enable or disable
and show or hide sets of controls.
<P>
<DT></DT>
<DD><B>4. </B>Why do you need to call the UpdateData function before checking the
value of one of the controls?
<P>
<DT></DT>
<DD>If the user has changed the value of the control on the screen, the UpdateData
function must be called, passing it TRUE as the function argument, to copy the values
from the controls on the window to the variables that are associated with those controls.
If UpdateData is not called, then the values of the variables may not correctly reflect
what the user has changed on the screen.
<P>
</DL>
<H3>Exercises</H3>
<DL>
<DT></DT>
<DD><B>1. </B>Add code to the Default Message button to reset the edit box to say
Enter a message here.
<P>
<DT></DT>
<DD>Using the Class Wizard, add a function to the Default Message button's clicked
event. In this function, add the code in Listing B.1.
<P>
</DL>
<H4>LISTING B.1. DAY2DLG.CPP--THE CODE TO PLACE A DEFAULT MESSAGE IN THE EDIT BOX.</H4>
<PRE> 1: void CDay2Dlg::OnDfltmsg()
2: {
3: // TODO: Add your control notification handler code here
4:
5: ///////////////////////
6: // MY CODE STARTS HERE
7: ///////////////////////
8:
9: // Set the message to a default message
10: m_strMessage = "Enter a message here";
11:
12: // Update the screen
13: UpdateData(FALSE);
14:
15: ///////////////////////
16: // MY CODE ENDS HERE
17: ///////////////////////
</PRE>
<PRE>18: }</PRE>
<DL>
<DT></DT>
<DD><B>2. </B>Add code to enable or disable and
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