XAllocClassHint(3X11)X Version 11 (Release 4)
XAllocClassHint(3X11)



  NAME
       XAllocClassHint, XSetClassHint, XGetClassHint, XClassHint -
       allocate class hints structure and set or read a window's
       WM_CLASS property

  SYNTAX
       XClassHint *XAllocClassHint()

       XSetClassHint(display, w, class_hints)
             Display *display;
             Window w;
             XClassHint *class_hints;

       Status XGetClassHint(display, w, class_hints_return)
             Display *display;
             Window w;
             XClassHint *class_hints_return;

  ARGUMENTS
       display   Specifies the connection to the X server.

       class_hints
                 Specifies the XClassHint structure that is to be
                 used.

       class_hints_return
                 Returns the XClassHint structure.

       w         Specifies the window.

  DESCRIPTION
       The XAllocClassHint function allocates and returns a pointer
       to a XClassHint structure.  Note that the pointer fields in
       the XClassHint structure are initially set to NULL.  If
       insufficient memory is available, XAllocClassHint returns
       NULL.  To free the memory allocated to this structure, use
       XFree.

       The XSetClassHint function sets the class hint for the
       specified window.


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       XSetClassHint can generate BadAlloc and BadWindow errors.

       The XGetClassHint function returns the class of the
       specified window.  To free res_name and res_class when
       finished with the strings, use XFree.

       XGetClassHint can generate a BadWindow error.

  PROPERTIES
       WM_CLASS  Set by application programs to allow window and
                 session managers to obtain the application's
                 resources from the resource database.

  STRUCTURES
       The XClassHint structure contains:

       typedef struct {
            char *res_name;
            char *res_class;
       } XClassHint;

       The res_name member contains the application name, and the
       res_class member contains the application class. Note that
       the name set in this property may differ from the name set
       as WM_NAME.  That is, WM_NAME specifies what should be
       displayed in the title bar and, therefore, can contain
       temporal information (for example, the name of a file
       currently in an editor's buffer).  On the other hand, the
       name specified as part of WM_CLASS is the formal name of the
       application that should be used when retrieving the
       application's resources from the resource database.

  DIAGNOSTICS
       BadAlloc  The server failed to allocate the requested
                 resource or server memory.

       BadWindow A value for a Window argument does not name a
                 defined Window.




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  SEE ALSO
       XAllocIconSize(3X11), XAllocSizeHints(3X11),
       XAllocWMHints(3X11), XFree(3X11), XSetCommand(3X11),
       XSetTransientForHint(3X11), XSetTextProperty(3X11),
       XSetWMClientMachine(3X11), XSetWMColormapWindows(3X11),
       XSetWMIconName(3X11), XSetWMName(3X11),
       XSetWMProperties(3X11), XSetWMProtocols(3X11),
       XStringListToTextProperty(3X11)
       Xlib - C Language X Interface

































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