NAME
XkbQueryExtension - Determines the compatibility of a library at run‐ time. SYNOPSIS Bool XkbQueryExtension (Display *dpy, int *opcodertrn, int *eventrtrn, int *errorrtrn, int *majorinout, int *minorinout); ARGUMENTS dpy connection to the X server opcodertrn backfilled with the major extension opcode eventrtrn backfilled with the extension base event code errorrtrn backfilled with the extension base error code majorinout compile time lib major version in, server major version out minorinout compile time lib min version in, server minor version out DESCRIPTION Call XkbQueryExtension to check for the presence and compatibility of the extension in the server and to initialize the extension. Because of potential version mismatches, you cannot use the generic extension mechanism functions ( XQueryExtension and XInitExtension ) for checking for the presence of, and initializing the Xkb extension. You must call XkbQueryExtension or XkbOpenDisplay before using any other Xkb library interfaces, unless such usage is explicitly allowed in the interface description in this document. The exceptions are:
XkbIgnoreExtension, XkbLibraryVersion, and a handful of audible-bell functions. You should not use any other Xkb functions if the extension is not present or is uninitialized. In general, calls to Xkb library functions made prior to initializing the Xkb extension cause BadAccess protocol errors. XkbQueryExtension both determines whether a compatible Xkb extension is present in the X server and initializes the extension when it is present. The XkbQueryExtension function determines whether a compatible version of the X Keyboard Extension is present in the server. If a compatible extension is present, XkbQueryExtension returns True; otherwise, it returns False. If a compatible version of Xkb is present, XkbQueryExtension initial‐ izes the extension. It backfills the major opcode for the keyboard extension in opcodertrn, the base event code in eventrtrn, the base error code in errorrtrn, and the major and minor version numbers of the extension in majorinout and minorinout. The major opcode is reported in the reqmajor fields of some Xkb events. For a discussion of the base event code. RETURN VALUES True The XkbQueryExtension function returns True if it deter‐ mines a compatible version of the X Keyboard Extension is present in the server. False The XkbQueryExtension function returns False if it determines a compatible version of the X Keyboard Exten‐ sion is not present in the server. SEE ALSO XkbIgnoreExtension(3), XkbLibraryVersion(3), XkbOpenDisplay(3) X Version 11 libX11 1.6.5 XkbQueryExtension(3)