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Once the breakpoint has been set, the statement will be clearly highlighted, as shown in Fig. 6.6. Observe the dark circle to the left of the selected statement, in addition to the heavy highlighting.
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Fig. 6.6 Note that the breakpoint is set ahead of the selected statement. That is, the break in the program execution will occur just before the selected statement is executed. Also, note that the breakpoint is removed the same way it is set; i.e., by selecting Toggle Breakpoint from the Debug menu, by clicking on the Toggle Breakpoint button on the Debug toolbar, or by pressing function key F9. Thus, the breakpoint feature is referred to as a toggle (i.e., the breakpoint is alternatively enabled and disabled during successive selections). If a program contains several different breakpoints, it may be convenient to remove all of them at once. To do so, simply select Clear All Breakpoints from the Debug menu, of press function keys Ctrl-Shift-F9 simultaneously. You may also define a temporary breakpoint by clicking on any point within a statement, and then either selecting Run to Cursor from the Debug menu or pressing function keys Ctrl-F8. The program may then be executed up to the temporary breakpoint. You can then define appropriate watch values and step through the remainder of the program, one instruction at a time. Unlike a regular breakpoint, however, which remains in place until it is toggled off, the temporary breakpoint becomes inactive after one program execution.
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6.4 DEFINING WATCH VALUES Watch values are the current values of certain variables or expressions that are displayed at breakpoints. Visual Basic supports three different types of watch values: ordinary watch values, quick watch values, and immediate watch values. Of these, ordinary watch values are generally the most useful, because they remain active as you step through a program on a line-by-line basis. If a particular command causes a variable or expression to change its value, the change is seen as it happens. Thus, unusual or unexpected values can be associated with specific commands within the code listing. Watch values are displayed in a separate Watches window. To open the Watches window, select Watch Window from the View menu, or click on the Watch Window button on the Debug toolbar. The Watches window will then appear at the bottom of the screen, as shown in Fig. 6.7. You may then define watch values by adding specific variables or expressions to the Watches window. This may be accomplished in any of the following ways: 1. Select Add Watch... from the Debug menu and then enter the required information in the Add Watch dialog box, as shown in Fig. 6.8. 2. Right-click on the Watches window, select Add Watch..., and then enter the required information in the Add Watch dialog box (the same dialog box shown in Fig. 6.8.) 3. Highlight an expression in the Code Editor Window and select Add Watch... from the Debug menu. The highlighted expression will then in the Add Watch dialog box (see Fig. 6.8).
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4. Highlight an expression in the Code Editor Window. Then right-click and select Add Watch... The highlighted expression will appear automatically in the Add Watch dialog box (see Fig. 6.8). As you step through a program beyond a breakpoint (see Sec. 6.5 below), the current value of each watch value will be displayed within the Watches window. Thus, you can see the watch values change as you progress through through each line of the program, as shown in Fig. 6.9.
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Fig. 6.7 The VB environment, showing the Watches window
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Fig. 6.8 The Add Watch dialog box
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Fig. 6.9 The Watches window appears automatically when the watch variable r is added Existing watch variables and expressions can easily be edited or removed by right-clicking within the Watches window and then selecting Edit Watch... or Delete Watch. Editing or deletion of watch values can also be carried out by selecting Edit Watch... from the Debug menu and then supplying the appropriate information to the Edit Watch dialog box, as shown in Fig. 6.10.
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