activex ocr

activex ocr

activex ocr

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Some type constructors, such as list and option, are generic, which means they can be used to form a range of types by instantiating the generic variables, such as int list, string list, int list list, and so on. You can write instantiations of generic types using either prefix notation (such as int list) or postfix notation (such as list<int>). Variable types such as 'a and 'T are placeholders for any type. s 3 and 5 discuss generics and variable types in more detail.

For the Edit and Detail views, it s not completely necessary to change the view code to make modifications. Many customizations can be made within the metadata definition files themselves. You learned about the structure of these files in 3, and what options are available to you as a module writer for customizing these views. You can use all those features that are available to customize the display as you need it. To customize the view you ll need to copy the metadata file that you wish to change to the custom/modules/modulename/metadata/ directory. This metadata file will then be called instead of the original one. Also, be sure to turn Developer Mode on in the System Settings in the Admin panel before doing any customizations to these files, so your changes will be picked up automatically. A simple example would be to remove the date_modified and date_created fields from the DetailView of the Notes modules module. The resulting detailviewdefs.php file would look like the code in Listing 8-4. Listing 8-4. Customized detailviewdefs.php Metadata File for the Notes Module

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Type inference works by analyzing your code to collect constraints. These are collected over the scope of particular parts of your program, such as each file for the F# command-line compiler and each chunk entered in F# Interactive. These constraints must be consistent, thus ensuring that your program is welltyped; you get a type error if not. Constraints are collected from top to bottom, left to right, and outside in. This is important because long identifier lookups, method overloading, and some other elements of the language are resolved using the normalized form of the constraint information available at the place where each construct is used. Type inference also automatically generalizes your code, which means that when your code is reusable and generic in certain obvious ways, it s given a suitable generic type without your needing to write down the generic type. Automatic generalization is the key to succinct but reusable typed programming. 5 discusses automatic generalization.

Functions are at the heart of most F# programming. It s not surprising that the first thing the wordCount function does is call a function in this case, the splitAtSpaces function, which is the first function defined in the program: let wordCount (text: string) = let words = splitAtSpaces text Let s first investigate the splitAtSpaces function by running F# Interactive:

In this exercise, you will practice importing data values from the Northwind sample database that is included with Microsoft Access 2003 and Access 2007. To complete this exercise, if you are using Excel 2007, you must have Access 2003 or Access 2007 installed. If you are using Excel 2003, you must have Access 2003 installed. First, if it s not installed already, install the Northwind sample database. If you have Access 2007 installed, do the following in Access 2007: 1. Start Access 2007. 2. Click the Microsoft Office Access Help icon. 3. In the Type Words to Search For box, type Northwind, and press Enter. 4. In the Results list, click Northwind 2007. The Microsoft Office Online web site appears.

> splitAtSpaces "hello world";; val it : string list = [ "hello"; "world" ] You can see that splitAtSpaces breaks the given text into words, splitting at spaces. In the earlier code, you can also see examples of the following: Literal characters such as ' ' and 'a' Literal strings such as "hello world" Literal lists of strings such as the returned value [ "hello"; "world" ]

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