When porting Windows CE to a unique embedded device, developers occasionally need to modify the default behavior of the OS. In this extensive, richly illustrated article, Windows CE development team lead Kurt Kennett explains how to replace so-called Core DLLs with customized, application-specific versions.
To illustrate the required process, Kennett uses an example of a device that has a display, but no standard input. Handling this situation might require replacing certain Core DLL components that depend on standard input, according to Kennett. For example, modules such as "ShowErr" expect to put up a dialog box and get input when error conditions occur. Thus, it becomes necessary to replace ShowErr with a version that simply outputs a message without expecting input.
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