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For example, in a Unix-like operating system, the Display structure contains the file handle of the socket of this channel (this can be retrieved using the ConnectionNumber macro.) Most Xlib functions have a Display structure as an argument because they either operate on the channel or are relative to a specific channel. In particular, all Xlib ...
The low-level library Xlib is the client-side implementation of the X11 protocol.It communicates with an X server, but does not provide any function for implementing graphical control elements ("widgets"), such as buttons or menus.
For example, a resource can specify that the background of every component of the xmail program must be red: xmail*background: red. However, when a program (e.g., the xmail program itself, when it wants to find out which background color to use) accesses the resource database via Xlib functions, it can only request the value of a specific resource.
the Xlib functions that send requests block until the appropriate replies, if any is expected, are received; in other words, an X Window client not using Xlib can send a request to the server and then do other operations while waiting for the reply, but a client using Xlib can only call an Xlib function that sends the request and wait for the ...
Xlib/XCB uses the protocol layer of Xlib, but replaces the Xlib transport layer with XCB, and provides access to the underlying XCB connection for direct use of XCB. Xlib/XCB allows an application to open a single connection to the X display server and use both XCB and Xlib, possibly through a mixture of libraries designed for one or the other.
• Choose a text color. • Choose a background text color. • Change your emails format. • Add emoticons. • Find and replace text, clear formatting, or add the time. • Insert a saved image. • Insert a hyperlink.
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Beside Xlib, the XCB library operates more closely to X protocol. In particular, most clients use libraries such as Xaw, Motif, GTK+, or Qt which in turn use Xlib for interacting with the server. Qt switched from Xlib to XCB with the 5.0 release, but client programs were almost entirely unaffected by this change.