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CentOS 7.0 - man page for xtcallconverter (centos section 3)

XtConvertAndStore(3)			   XT FUNCTIONS 		     XtConvertAndStore(3)

NAME
       XtConvertAndStore, XtCallConverter - invoke resource converters

SYNTAX
       Boolean XtConvertAndStore(Widget widget, String from_type, XrmValuePtr from, String
	      to_type, XrmValuePtr to_in_out);

       Boolean XtCallConverter(Display* dpy, XtConverter converter, XrmValuePtr args, Cardinal
	      num_args, XrmValuePtr from, XrmValuePtr to_in_out, XtCacheRef* cache_ref_return);

ARGUMENTS
       args	 Specifies the argument list that contains the additional arguments needed to
		 perform the conversion, or NULL.

       converter Specifies the conversion procedure that is to be called.

       from	 Specifies the value to be converted.

       from_type Specifies the source type.

       num_args  Specifies the number of additional arguments (often zero).

       to_type	 Specifies the destination type.

       to_in_out Returns the converted value.

       widget	 Specifies the widget to use for additional arguments, if any are needed, and the
		 destroy callback list.

       dpy	 Specifies the display with which the conversion is to be associated.

DESCRIPTION
       The XtConvertAndStore function looks up the type converter registered to convert from_type
       to to_type, computes any additional arguments needed, and then calls XtCallConverter.  (or
       XtDirectConvert if an old-style converter was registered with XtAddConverter or XtAppAdd-
       Converter.  ) with the from and to_in_out arguments.

       The XtCallConverter function looks up the specified type converter in the application con-
       text associated with the display and, if the converter was not registered or was regis-
       tered with cache type XtCacheAll or XtCacheByDisplay looks in the conversion cache to see
       if this conversion procedure has been called with the specified conversion arguments. If
       so, it checks the success status of the prior call, and if the conversion failed, XtCall-
       Converter returns False immediately; otherwise it checks the size specified in the to
       argument and, if it is greater than or equal to the size stored in the cache, copies the
       information stored in the cache into the location specified by to->addr, stores the cache
       size into to->size, and returns True.  If the size specified in the to argument is smaller
       than the size stored in the cache, XtCallConverter copies the cache size into the to->size
       and returns False.  If the converter was registered with cache type XtCacheNone or no
       value was found in the conversion cache, XtCallConverter calls the converter and, if it
       was not registered with cache type XtCacheNone, enters the result into the cache.  XtCall-
       Converter then returns what the converter returned.

       The cache_ref_return field specifies storage allocated by the caller in which an opaque
       value will be stored. If the type converter has been registered with the XtCacheRefCount
       modifier and if the value returned in in cache_ref_return is non-NULL, then the call
       should store the cache_ref_return value in order to decrement the reference count when the
       converted value is no longer required. The cache_ref_return argument should be NULL if the
       caller is unwilling or unable to store the value.

SEE ALSO
       XtAppReleaseCacheRefs(3)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11				   libXt 1.1.4			     XtConvertAndStore(3)


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