Developing Business Applications with OpenStep™ by Nik Gervae

By Nik Gervae

OpenStep is the software program improvement atmosphere co-developed through solar and subsequent desktops. This publication offers the 1st advent to OpenStep and the way it truly is used to construct company functions for subsequent, solar, and home windows NT platforms. in addition to protecting the fundamentals, it covers WebObjects (for constructing world-wide-web functions) and the firm items framework for constructing database functions. No critical OpenStep developer should want to be with out this book.

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Client objects can ask it to monitor input sources and provide input data as it becomes available. Its interface is quite small, consisting mostly of a few variants on the run message with timeouts and special modes. The Application Kit uses NSRunLoop to gather keyboard and mouse events, and the Foundation Framework's NSConnection class (described in Chapter 9: Distributed Applications) uses it to coordinate Distributed Objects messages between different processes or threads. Specific implementations add special input sources, such as NeXT's NSFileHandle and SunSoft's NSPosixFileDescriptor objects, which allow programs to monitor data availability from a file.

NeXT chose Objective-C because it was clearly more suited to high-level, rapid application development. Despite C++ having overtaken Objective-C in the market, Objective-C remains a better language for application development. Although both Objective-C and C++ derive from C, C++ is a systemslevel language, whereas Objective-C is an applications-level language. The distinction can be summarized by saying that C++ was designed with program efficiency in mind, while Objective-C is geared more toward programmer efficiency.

An important feature of the collection classes, stemming directly from Objective-C dynamism, is that a collection can accommodate objects of any type.

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