.NET/ASP.NET/C#/VB.NET PDF Document SDK

Another powerful feature of Venkman is the ability to write custom code that executes every time a breakpoint executes. In the Breakpoints window, right-click a breakpoint, and select the Breakpoint Properties menu item, as shown in Figure 7-19. This will open the Breakpoint Properties dialog box, which is a powerful tool that allows you to modify the behavior of the breakpoint and customize it to your exact needs. At the top of the window are two checkboxes, Enable Breakpoint and Clear Breakpoint After First Trigger. The behavior of these checkboxes is self-explanatory. The real power of the Breakpoints Properties window Figure 7-19. Select the Breakpoint Properties item comes in the When Triggered, Execute from the context menu of the Breakpoints window. checkbox, as shown in Figure 7-20.

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stops there. The syntax for setting the value of an element is the left arrow (<-) followed by the value to be assigned to the element. The next example shows an array being read from and written to. First an array, rhymeArray, is defined, and then you read all the members from it. Then you insert new values into the array, and finally you print out all the values you have. #light let rhymeArray = [| "Went to market" ; "Stayed home" ; "Had roast beef" ; "Had none" |] let let let let firstPiggy = rhymeArray.[0] secondPiggy = rhymeArray.[1] thirdPiggy = rhymeArray.[2] fourthPiggy = rhymeArray.[3]

Table 13-6. Four Analog Ins Component Placement (continued)

rhymeArray.[0] <- "Wee," rhymeArray.[1] <- "wee," rhymeArray.[2] <- "wee," rhymeArray.[3] <- "all the way home" print_endline firstPiggy print_endline secondPiggy print_endline thirdPiggy print_endline fourthPiggy print_any rhymeArray The results of this example, when compiled and executed, are as follows: Went to market Stayed home Had roast beef Had none [|"Wee,"; "wee,"; "wee,"; "all the way home"|] Arrays, like lists, use type parameterization, so the type of the array is the type of its contents followed by the array s type, so rhymeArray has type string array, which may also be written string[]. Multidimensional arrays in F# come in two slightly different flavors, jagged and rectangular. Jagged arrays, as the name suggests, are arrays where the second dimension is not a regular shape. They are simply arrays whose contents happen to other arrays, and the length of the inner arrays is not forced to be the same. In rectangular arrays, all inner arrays are of the same length; in fact, there is really no concept of an inner array since the whole array is just the same object. The method of getting and setting items in the two different types of arrays differs slightly.

Checking the When Triggered, Execute checkbox enables a text area. In this text area, you can write JavaScript code that will execute each time the breakpoint is encountered. Passed to this custom script is a parameter named __count__ that represents the number of times the breakpoint has been encountered.

Figure 13-32 shows the complete construction of the Four Analog Ins on a solderless breadboard. Although the potentiometers are shown attached directly to the breadboard, most likely they would be connected on long wires to measure the angle of a joint some distance from the circuit.

For jagged arrays, you use the period followed by the index in parentheses, but you have to use this twice (one time for each dimension), because the first time you get back the inner array and the second time you get the element within it The next example demonstrates a simple jagged array, called jagged The array members are accessed in two different ways The first inner array (at index 0) is assigned to the identifier singleDim, and then its first element is assigned to itemOne On the fourth line, the first element of the second inner array is assigned to itemTwo, using one line of code #light let jagged = [| [| "one" |] ; [| "two" ; "three" |] |] let singleDim = jagged[0] let itemOne = singleDim[0] let itemTwo = jagged[1].

Following the text area is a section where you can specify how the breakpoint should behave each time it is encountered Conveniently, the behavior can depend upon the return value of the custom code entered in the text area The behavior options are as follows: Continue Regardless of Result Stop Regardless of Result Stop If Result Is True Early Return from Caller with Result The options are mostly self-explanatory The option that is probably the most powerful is the Stop If Result Is True option Choosing this option means that the breakpoint will suspend execution only if the return value from the custom code is true Imagine how convenient it could be to suspend execution depending on a certain condition Consider the situation where you re iterating through a large list of objects and performing some calculations on each object.