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Now it s time for a more complicated example using C. For this example, you could write lots of interesting delegates: You could have a database that stores images and want to use the images for other things. If the image filename was defined to be the unique identifier for the image in the database, and the images have a .db extension, then you could have a delegate that extracts the images from the database. This would make using these images as seamless to the user as if the images existed in the file system. You could write a delegate that extracts images from PDF files (not the whole page as an image but individual graphical elements) and places them in a multiple image format such as TIFF. A delegate to decode images that have been MIME encoded would be useful. Both the OV519 Web camera and the JVC car radio head unit in my car use image formats that aren t supported by ImageMagick. You could write delegates to support them. For this chapter, I ll show how to write a simple delegate that renders black-and-white images to ASCII art. (The delegate could support color images, but you would need to convert them to grayscale before processing.) The rendering to ASCII art takes place with the aalib package, which can be found at http://aa-project.sf.net. Additionally, because of the way aalib is intended to work, only relatively small images will work with this version of the delegate. You could improve this for future versions of the delegate, but I won t fix it here because it would complicate the example.

Newlib: A small C library, which includes an equally small math library, designed for use on embedded systems Newlib was originally written by the folks at Cygnus Software, which was acquired by Red Hat long ago Newlib is now maintained by Jeff Johnston and Tom Fitzsimmons at Red Hat The Newlib home page is located at http://sourcesredhatcom/newlib/ uClibc: The best known and most complete alternate C library designed for use on embedded systems and maintained by Erik Anderson of BusyBox fame (or perhaps of uClibc fame, depending on your perspective) The uClibc home page is located at http://wwwuclibcorg UClibc has a very friendly configuration interface and is easy to build for cross-compiled toolchains thanks to its integration with the buildroot project (http://wwwbuildrootorg) The remainder of this chapter discusses how to work with and use each of these.

There are single parameter functions that you can also use to display the integer values for day, month, and year: This example returns the current year: SELECT YEAR(GETDATE()) This returns: 2005 This example returns the current month: SELECT MONTH(GETDATE())

Of course, the hard part of building these is building them so that they work with cross-compilers, but don t worry I ll cover that in 14..

This returns: 8 This example returns the current day: SELECT DAY(GETDATE()) This returns: 13

Note Other open source C libraries are also available, most notably those used by BSD-inspired distributions such as FreeBSD, NetBSD, OpenBSD, and Apple s Darwin. However, I see many more people using the four C libraries I listed previously and I am more of a Linux guy so I have chosen to focus on those.

In this recipe, I demonstrated single argument date functions. DAY returns an integer value for the day, MONTH returns the integer representing the month, and YEAR returns the integer representing the year of the evaluated date.

The CONVERT and CAST functions are both used to convert multiple data types from one type to another. The syntax for CAST is: CAST ( expression AS data_type [ (length ) ]) The first argument is the expression to convert (a table column or literal value, for example). The second argument is the data type to convert the expression to. The syntax for CONVERT is: CONVERT ( data_type [ ( length ) ] ,expression [ ,style ] ) The first argument is the data type that you wish to convert the expression to. The second argument is the expression that you want to be converted. The third argument, style, allows you to configure specific date presentation formats.

Before plunging into discussing my favorite alternate C libraries, it is worth reviewing how to tell GCC compilers to link with C libraries other than the standard C library. The key to this is the nostdlib option, which is supported by all GCC compilers. This option tells your GCC compiler not to use the standard system startup files or libraries when linking. When you specify this option, only the object

11/17/05

In this recipe, I ll demonstrate how to convert the data type of an integer to a char(4) data type. In the first example, an integer value is concatenated to a character string: SELECT 2000 + 'Cannot be concatenated' GO This returns the following error: Msg 245, Level 16, State 1, Line 1 Conversion failed when converting a value of type varchar to type int. Ensure that all values of the expression being converted can be converted to the target type, or modify query to avoid this type conversion. In the next example, CONVERT is used to change the integer value into the char data type: SELECT CONVERT(char(4), 2005) + ' Can now be concatenated!'