ultrix man page for xallocclasshint

XAllocClassHint(3X11)						     MIT X11R4						     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 structure that is to be used.

       class_hints_return
		 Returns the structure.

       w	 Specifies the window.

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

       The function sets the class hint for the specified window.

       can generate and errors.

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

       can generate a error.

Properties
       WM_CLASS  Set by application programs to allow window and session managers to obtain the application's resources from the resource data-
		 base.

Structures
       The 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
       The server failed to allocate the requested resource or server memory.

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

See Also
       XAllocIconSize(3X11), XAllocSizeHints(3X11), XAllocWMHints(3X11), XFree(3X11), XSetCommand(3X11), XSetTransientForHint(3X11), XSetTextProp-
       erty(3X11), XSetWMClientMachine(3X11), XSetWMColormapWindows(3X11), XSetWMIconName(3X11), XSetWMName(3X11), XSetWMProperties(3X11), XSetWM-
       Protocols(3X11), XStringListToTextProperty(3X11)
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

															     XAllocClassHint(3X11)