Teach Yourself Borland C++ in 14 Days - portal

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410 Day 11 NOTE NOTE 4. From the main menu, choose Run | Inspect. The Inspect dialog box is displayed. 5. Type this in the Expression field and click OK. 6. The Debug Inspector is displayed. You can only inspect this from within a class member function. If you happen to set a breakpoint in a regular function and then attempt to inspect this, you will get an error stating that this is an invalid symbol. As you can see, when you’re inspecting classes the Debug Inspector window contains three pages. The Data page shows all the data members for the class. The list of data members is hierarchical. The first items listed are the data items that belong to the immediate class. The next group of items listed is the data members of that class’s immediate ancestor class—in this case, TForm. If you scroll down through the Debug Inspector list, you will see that following the TForm data members are the data members for the TScrollingWinControl class (TForm’s immediate ancestor) and on and on. By using the arrow keys to move up and down through the list of data members, you can tell at a glance what each data member’s type is (look at the status bar). To further inspect a data member, double-click on the value column on the line showing the data member. A second Debug Inspector window is opened with the selected data member displayed. You can have multiple Debug Inspector windows open simultaneously. The Debug Inspector has a lot of information to load, so scrolling down through the list of items can be slow on some systems. The Methods page of the Debug Inspector displays the class’s methods. As with the data members discussed earlier, the list of methods is hierarchical. The first methods are those in the immediate class, followed by the methods in the ancestor classes. In some cases the Methods tab is not displayed (when inspecting simple data types, for instance). The Properties page of the Debug Inspector shows the properties for the class being inspected. Inspecting properties through the Debug Inspector is very slow if you are inspecting a VCL inherited class. Most of the time you can accomplish the same thing by inspecting the data member associated with a particular property on the Data page instead. Inspecting the data member is much faster than inspecting properties.
NOTE Using the Debugger The Methods page and the Properties page of the Debug Inspector are only available when you’re inspecting a class. When you’re inspecting simple data types, only the Data page will be displayed. The Debug Inspector speed menu has several items that allow you to work with the Debug Inspector and the individual variables. For example, instead of opening a new Debug Inspector window for each object, you can choose Descend from the speed menu to replace the current object in the Debug Inspector window with the object under the cursor. This method has an added advantage: The IDE will keep a history list of the objects you inspect. To go back to an object you have previously inspected, just choose the object from the combo box at the top of the Debug Inspector window. Choosing one of the objects in the history list will again show that object in the Debug Inspector window. The Change item on the Debug Inspector speed menu will allow you to change the value of a variable. Change data members with care. Changing the wrong data member or specifying a value that is invalid for that data member could lead to your program crashing. The Inspect item on the speed menu allows you to open a second Debug Inspector window with the item under the cursor displayed. The New Expression speed menu item allows you to enter a new expression to inspect in the Debug Inspector. The Show Inherited item on the Debug Inspector speed menu is a toggle that determines how much information the Debug Inspector should display. When the Show Inherited option is on, the Debug Inspector shows all data members, methods, and properties of the class being inspected as well as the data members, methods, and properties of all ancestor classes. When the Show Inherited option is off, only the data members, methods, and properties of the class itself are shown. Turning off this option can greatly speed up the Debug Inspector since it does not have as much information to display. TIP If you have a class data member and you don’t remember that data member’s type, you can click on it when stopped at a breakpoint and press Alt+F5 to display the Debug Inspector. The status bar at the bottom of the Debug Inspector window will tell you the data type of the variable. This also works for Windows and system #defines such as HINSTANCE, HWND, DWORD, and so on. 411 11
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At a Glance At A Glance WEEK 1 In W
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Day 1 Getting Your Feet Wet Week Ge
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Getting Your Feet Wet are divided i
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NOTE Getting Your Feet Wet As you m
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Getting Your Feet Wet but you need
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NOTE Getting Your Feet Wet In order
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NOTE Getting Your Feet Wet In C++,
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Getting Your Feet Wet An object, li
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Getting Your Feet Wet In some progr
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Listing 1.3. WRAPME.CPP. Getting Yo
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Getting Your Feet Wet Operator Desc
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NEW TERM Figure 1.5. Anatomy of a f
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SYNTAX ▼ ▲ Getting Your Feet We
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Getting Your Feet Wet Let’s prove
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Getting Your Feet Wet There is a sh
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Getting Your Feet Wet When the prog
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NOTE Function Description Getting Y
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NOTE Getting Your Feet Wet numbers
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Quiz Getting Your Feet Wet Windows
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Day 2 Wading In Deeper Wading In De
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NOTE Wading In Deeper If the condit
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SYNTAX ▼ ▼ TIP TIP Wading In De
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SYNTAX Wading In Deeper immediately
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Listing 2.1. FORLOOP.CPP. Wading In
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SYNTAX ▼ ▲ SYNTAX ▼ ▲ The w
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Wading In Deeper for (int i=0;i
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▲ default: dflt_statements; break
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Wading In Deeper This code generate
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NOTE Wading In Deeper You can creat
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Wading In Deeper So how do the sour
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Wading In Deeper 20: sizeof(listArr
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NOTE Wading In Deeper The displayRe
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Workshop Wading In Deeper The Works
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Day 3 Up to Your Neck in C++ Up to
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Up to Your Neck in C++ In this case
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Up to Your Neck in C++ Figure 3.1.
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Up to Your Neck in C++ That won’t
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Up to Your Neck in C++ 42: cin.getl
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Listing 3.2. REFERENC.CPP. Up to Yo
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Up to Your Neck in C++ Although it
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Up to Your Neck in C++ If you are a
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NOTE Up to Your Neck in C++ If you
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Up to Your Neck in C++ Now the comp
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Quiz Up to Your Neck in C++ Day 5,
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Totally Immersed: C++ Classes and O
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NOTE Totally Immersed: C++ Classes
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C++ Class Frameworks and the Visual
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Figure 5.1. The Object Inspector wi
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NOTE C++ Class Frameworks and the V
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Exercises C++ Class Frameworks and
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The C++Builder IDE Explored: Projec
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NOTE The C++Builder IDE Explored: P
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TIP Figure 6.11. The About box with
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Figure 6.18. The About box for the
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Quiz The C++Builder IDE Explored: P
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Working with the Form Designer and
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NOTE Working with the Form Designer
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NOTE TIP TIP Working with the Form
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NOTE Figure 7.10. The Alignment Pal
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In Review In Review WEEK 1 You cove
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In Review displayed based on user i
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At a Glance At A Glance WEEK 2 Are
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Day 8 VCL Components VCL Components
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VCL Components C++Builder displays
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VCL Components Important Common Pro
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Cursors VCL Components The Cursor p
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Figure 8.2. The Object Inspector sh
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VCL Components You can set this pro
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VCL Components Method Description I
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VCL Components Similarly, when the
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NOTE TIP VCL Components There may b
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VCL Components or load the Memo wit
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VCL Components Item Applies To Desc
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VCL Components You can use owner-dr
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VCL Components Property Applies To
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VCL Components for buttons that are
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VCL Components property set to true
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NOTE VCL Components To set the glyp
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VCL Components The GroupIndex Prope
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NOTE VCL Components form. Like the
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VCL Components As such, they go wit
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VCL Components The File Open and Fi
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VCL Components The InitialDir Prope
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VCL Components The Font dialog box
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Quiz VCL Components Q I’m respond
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Day 9 Creating Applications in C++B
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Figure 9.1. The Object Repository w
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Creating Applications in C++Builder
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TIP Creating Applications in C++Bui
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NOTE NOTE Creating Applications in
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Figure 9.4. The Object Repository c
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NOTE Creating Applications in C++Bu
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TIP Creating Applications in C++Bui
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Summary Creating Applications in C+
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More on Projects Day 10 More on Pro
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More on Projects The only time this
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TIP More on Projects You can add mo
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Building Internet Applications Day
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Building Internet Applications Tabl
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Building Internet Applications 65:
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Quiz Building Internet Applications
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C++Builder Extensions to C++ Day 14
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C++Builder Extensions to C++ compil
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C++Builder Extensions to C++ __int8
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C++Builder Extensions to C++ value
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C++Builder Extensions to C++ you ca
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In Review In Review WEEK 2 Wow, tha
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Answers to Quiz Questions APPENDIX
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Day 10 Answers to Quiz Questions 1.
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Symbols & (ampersands), 246 © (cop
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C C (programming language), 132 C c
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File Save, 309-312 Find/Replace, 31
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Insert Template, 248 Object Reposit
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Cascade( ), 198 Close( ), 198 Close
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Layout property (BitBtn component),
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object-oriented programming, see OO
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protected member functions, 106 pro
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structures arrays, 58 C vs. C++, 64
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A V I A C O M S E R V I C E The Inf
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Component Palette Quick Reference S
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Add to Your Sams Library Today with
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Overview Introduction Introduction
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Introduction VCL Explored .........
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