XLookUpAssoc() XLookUpAssoc()
Name
XLookUpAssoc - obtain data from an association table.
Synopsis
char * XLookUpAssoc(display, table, x_id)
Display *display;
XAssocTable *table;
XID x_id;
Arguments
display Specifies a connection to an X server; returned from XOpenDisplay().
table Specifies the association table.
x_id Specifies the X resource ID.
Returns
The data from the association table.
Description
This function is provided for compatibility with X Version 10. To use it you must include the file <X11/X10.h> and link with the library
-loldX.
Association tables provide a way of storing data locally and accessing by ID. XLookUpAssoc() retrieves the data stored in an XAssocTable
by its XID. If the matching XID can be found in the table, the routine returns the data associated with it. If the x_id cannot be found
in the table the routine returns NULL.
For more information on association tables, see Volume One, Appendix B, X10 Compatibility.
Structures
typedef struct {
XAssoc *buckets; /* pointer to first bucket in bucket array */
int size; /* table size (number of buckets) */
} XAssocTable;
typedef struct _XAssoc {
struct _XAssoc *next; /* next object in this bucket */
struct _XAssoc *prev; /* previous object in this bucket */
Display *display; /* display which owns the ID */
XID x_id; /* X Window System ID */
char *data; /* pointer to untyped memory */
} XAssoc;
See Also
XCreateAssocTable(), XDeleteAssoc(), XDestroyAssocTable(), XMakeAssoc().
Xlib - Association Tables XLookUpAssoc()
Check Out this Related Man Page
XSaveContext(3X11) XLIB FUNCTIONS XSaveContext(3X11)NAME
XSaveContext, XFindContext, XDeleteContext, XUniqueContext - associative look-up routines
SYNTAX
int XSaveContext(display, rid, context, data)
Display *display;
XID rid;
XContext context;
XPointer data;
int XFindContext(display, rid, context, data_return)
Display *display;
XID rid;
XContext context;
XPointer *data_return;
int XDeleteContext(display, rid, context)
Display *display;
XID rid;
XContext context;
XContext XUniqueContext()
ARGUMENTS
context Specifies the context type to which the data belongs.
data Specifies the data to be associated with the window and type.
data_return
Returns the data.
display Specifies the connection to the X server.
rid Specifies the resource ID with which the data is associated.
DESCRIPTION
If an entry with the specified resource ID and type already exists, XSaveContext overrides it with the specified context. The XSaveContext
function returns a nonzero error code if an error has occurred and zero otherwise. Possible errors are XCNOMEM (out of memory).
Because it is a return value, the data is a pointer. The XFindContext function returns a nonzero error code if an error has occurred and
zero otherwise. Possible errors are XCNOENT (context-not-found).
The XDeleteContext function deletes the entry for the given resource ID and type from the data structure. This function returns the same
error codes that XFindContext returns if called with the same arguments. XDeleteContext does not free the data whose address was saved.
The XUniqueContext function creates a unique context type that may be used in subsequent calls to XSaveContext.
SEE ALSO
Xlib - C Language X Interface
X Version 11 Release 6.6 XSaveContext(3X11)
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