NAME

       DMXQueryVersion - determine DMX extension version

SYNOPSIS

       #include <X11/extensions/dmxext.h>

       Bool DMXQueryVersion(Display *dpy,
                            int *major_version,
                            int *minor_version,
                            int *patch_version);

DESCRIPTION

       DMXQueryVersion() returns version information about the DMX protocol extension.

       Any  incompatible  changes to the protocol will be indicated by a change in major_version.
       Small, upward-compatible changes will be indicated  by  a  change  in  minor_version.   In
       general,  patch_version is for informational purposes and will encode the date of the last
       protocol revision (e.g., 20040604).

RETURN VALUE

       If  the  DMX  protocol  extension  is   available,   major_version,   minor_version,   and
       patch_version will be set, and True will be returned.  Otherwise, False will be returned.

NOTES

       At the time of this writing, the DMX protocol is at version 2.2.

       Version  2.2  was  the  final  development  version,  and code supporting this version was
       submitted to upstream X server repositories in the summer of 2004.

       Version 1.5 was the last of the 1.x series, which was used for development  before  screen
       and  input  addition  and  removal  were  supported.  Version 2.0 and 2.1 were development
       versions that partially supported screen and input addition and removal.

       Since we do not expect development versions to be  widely  used,  we  recommend  that  any
       software  that  uses  the  DMX  protocol  extension to support only versions 2.2 and above
       (although they should detect earlier versions and  either  reduce  functionality  or  fail
       gracefully).

SEE ALSO

       DMXQueryExtension(3), DMX(3), Xdmx(1)