XAllocClassHint(3X11) X11R5 XAllocClassHint(3X11)NAME
XAllocClassHint, XSetClassHint, XGetClassHint, XClassHint - allocate
class hints structure and set or read a window's WM_CLASS property
SYNTAXXClassHint *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. If the
strings are not in the Host Portable Character Encoding the result is
implementation dependent.
can generate and errors.
The function returns the class hint of the specified window to the mem‐
bers of the supplied structure. If the data returned by the server is
in the Latin Portable Character Encoding, then the returned strings are
in the Host Portable Character Encoding. Otherwise, the result is
implementation dependent. It returns nonzero status on success; other‐
wise it returns a zero status. To free res_name and res_class when
finished with the strings, use on each individually.
can generate a error.
PROPERTIES
WM_CLASS Set by application programs to allow window and session man‐
agers to obtain the application's resources from the resource
database.
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 ALSOXAllocIconSize(3X11), XAllocSizeHints(3X11), XAllocWMHints(3X11),
XFree(3X11), XSetCommand(3X11), XSetTransientForHint(3X11), XSet‐
TextProperty(3X11), XSetWMClientMachine(3X11), XSetWMColormapWin‐
dows(3X11), XSetWMIconName(3X11), XSetWMName(3X11), XSetWMProper‐
ties(3X11), XSetWMProtocols(3X11), XStringListToTextProperty(3X11)
Xlib - C Language X Interface
XAllocClassHint(3X11)
