2006-11-25 11:01:46 -07:00
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.\" Copyright (c) 1993, 1994 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtConvert-And-Store XtCall-Converter wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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.\" heavy for your eyes...
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.\"
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.ll -5n
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.R
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. \" Note End -- doug kraft 3/85
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.de NE
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.ce 0
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.el .sp 10p
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..
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.ny0
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.TH XtConvertAndStore __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtConvertAndStore, XtCallConverter \- invoke resource converters
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.SH SYNTAX
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.HP
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Boolean XtConvertAndStore(Widget \fIwidget\fP, String \fIfrom_type\fP,
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XrmValuePtr \fIfrom\fP, String \fIto_type\fP, XrmValuePtr \fIto_in_out\fP);
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.HP
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Boolean XtCallConverter(Display* \fIdpy\fP, XtConverter \fIconverter\fP,
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XrmValuePtr \fIargs\fP, Cardinal \fInum_args\fP, XrmValuePtr \fIfrom\fP,
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XrmValuePtr \fIto_in_out\fP, XtCacheRef* \fIcache_ref_return\fP);
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.SH ARGUMENTS
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.IP \fIargs\fP 1i
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Specifies the argument list that contains the additional arguments needed
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to perform the conversion, or NULL.
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.IP \fIconverter\fP 1i
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Specifies the conversion procedure that is to be called.
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.IP \fIfrom\fP 1i
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Specifies the value to be converted.
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.IP \fIfrom_type\fP 1i
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Specifies the source type.
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.IP \fInum_args\fP 1i
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Specifies the number of additional arguments (often zero).
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.IP \fIto_type\fP 1i
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Specifies the destination type.
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.IP \fIto_in_out\fP 1i
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Returns the converted value.
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.IP \fIwidget\fP 1i
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Specifies the widget to use for additional arguments, if any are needed,
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and the destroy callback list.
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.IP \fIdpy\fP 1i
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Specifies the display with which the conversion is to be associated.
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.SH DESCRIPTION
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The
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.ZN XtConvertAndStore
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function looks up the type converter registered to convert from_type
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to to_type, computes any additional arguments needed, and then calls
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.ZN XtCallConverter .
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(or
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.ZN XtDirectConvert
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if an old-style converter was registered with
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.ZN XtAddConverter
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or
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.ZN XtAppAddConverter .
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) with the from and to_in_out arguments.
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.LP
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The
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.ZN XtCallConverter
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function looks up the specified type converter in the application
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context associated with the display and, if the converter was not
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registered or was registered with cache type
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.ZN XtCacheAll
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or
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.ZN XtCacheByDisplay
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looks in the conversion cache to see if this conversion procedure
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has been called with the specified conversion arguments. If so, it
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checks the success status of the prior call, and if the conversion
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failed,
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.ZN XtCallConverter
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returns
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.ZN False
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immediately; otherwise it checks the size specified in the \fIto\fP
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argument and, if it is greater than or equal to the size stored in the
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cache, copies the information stored in the cache into the location
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specified by \fIto->addr\fP, stores the cache size into \fIto->size\fP,
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and returns
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.ZN True .
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If the size specified in the \fIto\fP argument is smaller than the size
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stored in the cache,
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.ZN XtCallConverter
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copies the cache size into the \fIto->size\fP and returns
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.ZN False .
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If the converter was registered with cache type
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.ZN XtCacheNone
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or no value was found in the conversion cache,
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.ZN XtCallConverter
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calls the converter and, if it was not registered with cache type
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.ZN XtCacheNone ,
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enters the result into the cache.
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.ZN XtCallConverter
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then returns what the converter returned.
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.LP
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The \fIcache_ref_return\fP field specifies storage allocated by the
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caller in which an opaque value will be stored. If the type converter
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has been registered with the
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.ZN XtCacheRefCount
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modifier and if the value returned in in \fIcache_ref_return\fP is
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non-NULL, then the call should store the \fIcache_ref_return\fP value
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in order to decrement the reference count when the converted value
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is no longer required. The \fIcache_ref_return\fP argument should be
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NULL if the caller is unwilling or unable to store the value.
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.SH "SEE ALSO"
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2011-09-10 03:36:19 -06:00
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XtAppReleaseCacheRefs(__libmansuffix__)
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2006-11-25 11:01:46 -07:00
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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