Simple .NET/ASP.NET PDF document editor web control SDK

#light open SystemIO if FileExists("testtxt") then print_endline "Text file \"testtxt\" is present" else print_endline "Text file \"testtxt\" does not exist" This example calls a static method from the NET Framework BCL Calling a static method is almost identical to calling an F# function First comes the class name followed by a period () and then the name of the method; the only real difference is in the syntax for passing the arguments, which are surrounded by parentheses and separated by commas You make a call to the SystemIOFile class s Exists method to test whether a file exists and print an appropriate message depending on the result Often, you ll want to use the functionality of an existing NET method but also want to use it in a functional manner.

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Listing 13-7 is just the Red part of the ReadRawColor subroutine from the Readhue program. (You can find the full program listing in Appendix C.) LEDs are turned on one at a time by sending the appropriate bit pattern and then the light level is measured with the LDR. The sensor type is switched between I2C (Lowspeed) and Touch so that the same port can be used for two different functions. Waits are introduced because it takes the LDR time to settle after the color has changed.

A common pattern in F# to achieve this is to import the function by writing a thin NET wrapper The next example demonstrates this: #light open SystemIO let exists filePath = FileExists(filePath) let files = ["test1txt"; "test2txt"; "test3txt"] let results = Listmap exists files print_any results Unless you ve created these specific text files in the directory where it runs, your result will be [false; false; false] You have used the BCL Exists method to test whether a list of files exists On the first line, you create a function that wraps the Exists method call, so you can use it in a functional manner and pass it to the map function When using NET methods with lots of arguments, it can sometimes be helpful to know the names of the arguments to help you keep track of what each argument is doing.

Considering how many browsers don t fully support existing standards, it s hard to say, but as more sites and applications take advantage of Ajax techniques, expect to see support in future releases However, based on the length of time it took for earlier DOM versions to be adopted, don t hold your breath In an interview, DOM Activity Lead Philippe Le H garet said it will take significant time to see widespread adoption Some support exists for DOM Level 3 Opera s XMLHttpRequest implementation is based on its work in supporting DOM Level 3, and the Java API for XML Processing (JAXP) version 13 supports it However, the emergence of a W3C specification signals the importance of Ajax techniques Load and Save is the culmination of an effort that began in August 1997 as a way of solving the incompatibilities in the browsers of the day.

Listing 13-7. NXC Code to Read the Red Value SetSensorLowspeed (port); WriteBuf[1] = RED ^ 0xff; I2CWrite(port, 0, WriteBuf); Wait(20); SetSensorTouch (port); Wait(80); RawRGB.Red = 1024 - SensorRaw (port); Construction on the solderless breadboard is straightforward, as shown in Figure 13-44. Start with step-by-step assembly instructions from the Eight Outs project in Table 13-2 until you get to R3; then start following the instructions in Table 13-9.

F# lets you use named arguments, where you give the name of the argument, then an equals sign, and then the value of the argument The following example demonstrates this with an overload of FileOpen() that takes four arguments: #light open SystemIO let file = FileOpen(path = "testtxt", mode = FileModeAppend, access = FileAccessWrite, share = FileShareNone) fileClose().