By Adrian Nye
Overlaying X11 unencumber five, the Xlib Programming handbook is an entire advisor to programming the X library (Xlib), the bottom point of programming interface to X. It comprises introductions to internationalization, device-independent colour, font provider, and scalable fonts.Includes chapters on: X Window procedure ideas an easy purchaser program Window attributes The images context photographs in perform colour occasions Interclient communique Internationalization The source supervisor a whole customer software Window managementThis guide is a better half to quantity 2, Xlib Reference handbook.
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Extra info for Xlib Programming Manual for Version 11, Rel. 5, Vol. 1 (Definitive Guides to the X Window System)
A set of routines to make it easier to port programs from X Version 10 to Version 11 is provided in a separate library. h> in your source file and link with both the −lX11 and −loldX options to your cc command. h> if you use system calls, file manipulation, or string manipulation utilities. This header file includes the right files for various operating systems. Several other libraries are available in the X distribution from MIT: Xmu, the miscellaneous utilities library, and Xext, the extensions library (which requires additional server−side software in order to function).
2 The User Interface The first step in designing an application will be to determine what its features will be. Determining how the user will invoke those features is probably the next step. This means designing a user interface. X was purposely designed to be "policy free," and therefore it does not come with a standard user interface like many other window systems do. You will have to write all parts of the user interface yourself, unless you choose to use one of the toolkits that are available.
Note that most servers only control a single screen. However, an X server can support multiple screens. The most common example is probably the Apple MacX server for the Macintosh. The XOpenDisplay() routine returns a pointer to a structure of type Display. If the connection is successful, the structure will be filled with information about the server and each of its screens. If the attempt to create a connection fails, XOpenDisplay() returns NULL. The code in Example 3−2 above checks to make sure this returned pointer is not NULL before proceeding.