175 lines
3.4 KiB
Plaintext
175 lines
3.4 KiB
Plaintext
.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 XtMake-Geometry-Request XtQuery-Geometry 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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.ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de FD
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.LP
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.KS
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.TA .5i 3i
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.nf
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..
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.de FN
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.fi
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.KE
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.LP
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..
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.de IN \" send an index entry to the stderr
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..
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.de C{
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.KS
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.D
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.\"
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.ie "\\*(.T"480" .ft L
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.de C}
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.DE
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.R
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..
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..
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.de NT
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.ne 7
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.ds NO Note
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.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
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.R
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..
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. \" Note End -- doug kraft 3/85
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.de NE
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..
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.ny0
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.TH XtConvert 3Xt "Release 3" "X Version 11" "XT FUNCTIONS"
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.SH NAME
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XtConvert, XtDirectConvert \- invoke resource converters
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.SH SYNTAX
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void XtConvert(\fIw\fP, \fIfrom_type\fP, \fIfrom\fP, \fIto_type\fP, \
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\fIto_return\fP)
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.br
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Widget \fIw\fP;
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.br
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String \fIfrom_type\fP;
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.br
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XrmValuePtr \fIfrom\fP;
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.br
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String \fIto_type\fP;
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.br
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XrmValuePtr \fIto_return\fP;
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.LP
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void XtDirectConvert(\fIconverter\fP, \fIargs\fP, \fInum_args\fP, \fIfrom\fP, \
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\fIto_return\fP)
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.br
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XtConverter \fIconverter\fP;
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.br
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XrmValuePtr \fIargs\fP;
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.br
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Cardinal \fInum_args\fP;
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.br
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XrmValuePtr \fIfrom\fP;
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.br
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XrmValuePtr \fIto_return\fP;
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.SH ARGUMENTS
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.ds Al that contains the additional arguments needed to perform \
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the conversion (often NULL)
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.IP \fIargs\fP 1i
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Specifies the argument list \*(Al.
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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_return\fP 1i
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Returns the converted value.
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.ds Wi to use for additional arguments (if any are needed)
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.IP \fIw\fP 1i
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Specifies the widget \*(Wi.
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.SH DESCRIPTION
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The
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.ZN XtConvert
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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 XtDirectConvert .
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.LP
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The
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.ZN XtDirectConvert
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function looks in the converter cache to see if this conversion procedure
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has been called with the specified arguments.
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If so, it returns a descriptor for information stored in the cache;
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otherwise, it calls the converter and enters the result in the cache.
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.LP
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Before calling the specified converter,
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.ZN XtDirectConvert
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sets the return value size to zero and the return value address to NULL.
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To determine if the conversion was successful,
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the client should check to_return.address for non-NULL.
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.SH "SEE ALSO"
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XtAppAddConverter(3Xt),
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XtStringConversionWarning(3Xt)
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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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