XtConvert(3Xt) XtConvert(3Xt)
NAME
XtConvert, XtDirectConvert - invoke resource converters
SYNOPSIS
void XtConvert(w, from_type, from, to_type, to_return)
Widget w;
String from_type;
XrmValuePtr from;
String to_type;
XrmValuePtr to_return;
void XtDirectConvert(converter, args, num_args, from,
to_return)
XtConverter converter;
XrmValuePtr args;
Cardinal num_args;
XrmValuePtr from;
XrmValuePtr to_return;
ARGUMENTS
args Specifies the argument list that contains the
additional arguments needed to perform the
conversion (often 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_return Returns the converted value.
w Specifies the widget to use for additional
arguments (if any are needed).
DESCRIPTION
The XtConvert function looks up the type converter
registered to convert from_type to to_type, computes
any additional arguments needed, and then calls
XtDirectConvert.
The XtDirectConvert function looks in the converter
cache to see if this conversion procedure has been
called with the specified arguments. If so, it returns
a descriptor for information stored in the cache;
otherwise, it calls the converter and enters the result
- 1 -
XtConvert(3Xt) XtConvert(3Xt)
in the cache.
Before calling the specified converter, XtDirectConvert
sets the return value size to zero and the return value
address to NULL. To determine if the conversion was
successful, the client should check to_return.address
for non-NULL.
SEE ALSO
XtAppAddConverter(3Xt), XtStringConversionWarning(3Xt)
X Toolkit Intrinsics Programming Manual
Xlib Programming Manual
- 2 -