XtConvertAndStore.man   [plain text]

.\" $Xorg: XtConvSt.man,v 1.3 2000/08/17 19:41:59 cpqbld Exp $
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.ds xW X Toolkit Athena Widgets \- C Language Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
.ds Rn 3
.ds Vn 2.2
.hw XtConvert-And-Store XtCall-Converter wid-get
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.TH XtConvertAndStore __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtConvertAndStore, XtCallConverter \- invoke resource converters
.SH SYNTAX
.HP
Boolean XtConvertAndStore(Widget \fIwidget\fP, String \fIfrom_type\fP,
XrmValuePtr \fIfrom\fP, String \fIto_type\fP, XrmValuePtr \fIto_in_out\fP);
.HP
Boolean XtCallConverter(Display* \fIdpy\fP, XtConverter \fIconverter\fP,
XrmValuePtr \fIargs\fP, Cardinal \fInum_args\fP, XrmValuePtr \fIfrom\fP,
XrmValuePtr \fIto_in_out\fP, XtCacheRef* \fIcache_ref_return\fP); 
.SH ARGUMENTS
.IP \fIargs\fP 1i
Specifies the argument list that contains the additional arguments needed 
to perform the conversion, or NULL.
.IP \fIconverter\fP 1i
Specifies the conversion procedure that is to be called.
.IP \fIfrom\fP 1i
Specifies the value to be converted.
.IP \fIfrom_type\fP 1i
Specifies the source type.
.IP \fInum_args\fP 1i
Specifies the number of additional arguments (often zero).
.IP \fIto_type\fP 1i
Specifies the destination type.
.IP \fIto_in_out\fP 1i
Returns the converted value.
.IP \fIwidget\fP 1i
Specifies the widget to use for additional arguments, if any are needed,
and the destroy callback list.
.IP \fIdpy\fP 1i
Specifies the display with which the conversion is to be associated.
.SH DESCRIPTION
The
.ZN XtConvertAndStore
function looks up the type converter registered to convert from_type 
to to_type, computes any additional arguments needed, and then calls
.ZN XtCallConverter .
(or
.ZN XtDirectConvert
if an old-style converter was registered with
.ZN XtAddConverter
or
.ZN XtAppAddConverter .
) with the from and to_in_out arguments.
.LP
The
.ZN XtCallConverter
function looks up the specified type converter in the application
context associated with the display and, if the converter was not
registered or was registered with cache type
.ZN XtCacheAll
or
.ZN 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,
.ZN XtCallConverter
returns
.ZN False
immediately; otherwise it checks the size specified in the \fIto\fP
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 \fIto->addr\fP, stores the cache size into \fIto->size\fP,
and returns
.ZN True .
If the size specified in the \fIto\fP argument is smaller than the size
stored in the cache,
.ZN XtCallConverter
copies the cache size into the \fIto->size\fP and returns
.ZN False .
If the converter was registered with cache type 
.ZN XtCacheNone
or no value was found in the conversion cache,
.ZN XtCallConverter
calls the converter and, if it was not registered with cache type
.ZN XtCacheNone ,
enters the result into the cache.
.ZN XtCallConverter
then returns what the converter returned.
.LP
The \fIcache_ref_return\fP field specifies storage allocated by the
caller in which an opaque value will be stored. If the type converter
has been registered with the
.ZN XtCacheRefCount
modifier and if the value returned in in \fIcache_ref_return\fP is
non-NULL, then the call should store the \fIcache_ref_return\fP value
in order to decrement the reference count when the converted value
is no longer required. The \fIcache_ref_return\fP argument should be
NULL if the caller is unwilling or unable to store the value.
.SH "SEE ALSO"
XtAppReleaseCacheRefs(3Xt)
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP