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SuSE 11.3 - man page for xkbqueryextension (suse section 3)

XkbQueryExtension(3)						   XKB FUNCTIONS					      XkbQueryExtension(3)

XkbQueryExtension - Determines the compatibility of a library at runtime.
Bool XkbQueryExtension (Display *dpy, int *opcode_rtrn, int *event_rtrn, int *error_rtrn, int *major_in_out, int *minor_in_out);
dpy connection to the X server opcode_rtrn backfilled with the major extension opcode event_rtrn backfilled with the extension base event code error_rtrn backfilled with the extension base error code major_in_out compile time lib major version in, server major version out minor_in_out compile time lib min version in, server minor version out
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 check- ing 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 func- tions. 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 compati- ble extension is present, XkbQueryExtension returns True; otherwise, it returns False. If a compatible version of Xkb is present, XkbQueryExtension initializes the extension. It backfills the major opcode for the keyboard extension in opcode_rtrn, the base event code in event_rtrn, the base error code in error_rtrn, and the major and minor version numbers of the extension in major_in_out and minor_in_out. The major opcode is reported in the req_major fields of some Xkb events. For a discussion of the base event code.
True The XkbQueryExtension function returns True if it determines 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 Extension is not present in the server.
XkbIgnoreExtension(3), XkbLibraryVersion(3), XkbOpenDisplay(3) X Version 11 libX11 1.3.2 XkbQueryExtension(3)

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