2006-11-25 09:33:55 -07:00
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.\"
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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc
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.\"
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.\" Rewritten for X.org by Chris Lee <clee@freedesktop.org>
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this documentation
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.\" for any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\" Chris Lee makes no representations about the suitability for any purpose
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.\" of the information in this document. It is provided \`\`as-is'' without
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.\" express or implied warranty.
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.\"
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2008-06-11 14:55:41 -06:00
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.ds xL Programming with Xlib
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2006-11-25 09:33:55 -07:00
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.TH XQueryExtension __libmansuffix__ __xorgversion__ "X FUNCTIONS"
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.SH NAME
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XQueryExtension, XListExtensions, XFreeExtensionList \- list available extensions
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.SH SYNTAX
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.HP
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Bool XQueryExtension(\^\fIdisplay, \fIname\fP, \fImajor_opcode_return\fP, \fIfirst_event_return\fP, \fIfirst_error_return\fP\^)
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.HP
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char **XListExtensions(\^\fIdisplay\fP, \fInextensions_return\fP\^)
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.HP
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XFreeExtensionList(\^\fIlist\fP\^)
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.SH ARGUMENTS
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIname\fP 1i
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Specifies the extension name.
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.IP \fImajor_opcode_return\fP 1i
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Returns the major opcode.
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.IP \fIfirst_event_return\fP 1i
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Returns the first event code, if any.
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.IP \fIfirst_error_return\fP 1i
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Returns the first error code, if any.
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.IP \fInextensions_return\fP 1i
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Returns the number of extensions listed.
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.IP \fIlist\fP 1i
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Specifies the list of extension names.
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.SH DESCRIPTION
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.LP
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The \fIXQueryExtension\fP function determines if the named extension is
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present. If the extension is not present, \fIXQueryExtension\fP returns
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\fIFalse\fP; otherwise, it returns \fITrue\fP. If the extension is present,
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\fIXQueryExtension\fP returns the major opcode for the extension to
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major_opcode_return; otherwise, it returns zero. Any minor opcode and the
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request formats are specific to the extension. If the extension involves
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additional event types, \fIXQueryExtension\fP returns the base event type code
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to first_event_return; otherwise, it returns zero. The format of the events is
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specific to the extension. If the extension involves additional error codes,
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\fIXQueryExtension\fP returns the base error code to first_error_return;
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otherwise, it returns zero. The format of additional data in the errors is
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specific to the extension. If the extension name is not in the Host Portable
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Character Encoding the result is implementation-dependent. Uppercase and
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lowercase matter; the strings ``thing'', ``Thing'', and ``thinG'' are all
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considered different names.
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.LP
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The \fIXListExtensions\fP function returns a list of all extensions supported
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by the server. If the data returned by the server is in the Latin Portable
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Character Encoding, then the returned strings are in the Host Portable
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Character Encoding. Otherwise, the result is implementation-dependent.
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.LP
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The \fIXFreeExtensionList\fP function frees the memory allocated by
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\fIXListExtensions\fP.
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