'\" t

.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium

.\" Copyright \(co 2000  The XFree86 Project, Inc.

.\"

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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by

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.\" Portions Copyright \(co 1990, 1991 by

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.\" Permission to use, copy, modify and distribute this documentation for

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.\" 

.ds xT X Toolkit Intrinsics \- C Language Interface

.ds xW Athena X Widgets \- C Language X Toolkit Interface

.ds xL Xlib \- C Language X Interface

.ds xC Inter-Client Communication Conventions Manual

.na

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'\" t

.TH XmbLookupString __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"

.SH NAME

XmbLookupString, XwcLookupString, Xutf8LookupString \- obtain composed input from an input method

.SH SYNTAX

.HP

int XmbLookupString\^(\^XIC \fIic\fP\^, XKeyPressedEvent *\fIevent\fP, char

*\fIbuffer_return\fP\^, int \fIbytes_buffer\fP\^, KeySym

*\fIkeysym_return\fP\^, Status *\fIstatus_return\fP\^); 

.HP

int XwcLookupString\^(\^XIC \fIic\fP\^, XKeyPressedEvent *\fIevent\fP\^,

wchar_t *\fIbuffer_return\fP\^, int \fIwchars_buffer\fP\^, KeySym

*\fIkeysym_return\fP\^, Status *\fIstatus_return\fP\^); 

.HP

int Xutf8LookupString\^(\^XIC \fIic\fP\^, XKeyPressedEvent *\fIevent\fP, char

*\fIbuffer_return\fP\^, int \fIbytes_buffer\fP\^, KeySym

*\fIkeysym_return\fP\^, Status *\fIstatus_return\fP\^); 

.SH ARGUMENTS

.IP \fIbuffer_return\fP 1i

Returns a multibyte string or wide character string (if any)

from the input method.

.IP \fIbytes_buffer\fP 1i

.br

.ns

.IP \fIwchars_buffer\fP 1i

Specifies space available in the return buffer.

.ds Ev key event to be used

.IP \fIevent\fP 1i

Specifies the \*(Ev.

.IP \fIic\fP 1i

Specifies the input context.

.IP \fIkeysym_return\fP 1i

Returns the KeySym computed from the event if this argument is not NULL.

.IP \fIstatus_return\fP 1i

Returns a value indicating what kind of data is returned.

.SH DESCRIPTION

The

.ZN XmbLookupString ,

.ZN XwcLookupString

and

.ZN Xutf8LookupString

functions return the string from the input method specified

in the buffer_return argument.

If no string is returned,

the buffer_return argument is unchanged.

.LP

The KeySym into which the KeyCode from the event was mapped is returned

in the keysym_return argument if it is non-NULL and the status_return

argument indicates that a KeySym was returned.

If both a string and a KeySym are returned,

the KeySym value does not necessarily correspond to the string returned.

.LP

.ZN XmbLookupString

and

.ZN Xutf8LookupString

return the length of the string in bytes, and

.ZN XwcLookupString

returns the length of the string in characters.

Both

.ZN XmbLookupString

and

.ZN XwcLookupString

return text in the encoding of the locale bound to the input method

of the specified input context, and

.ZN Xutf8LookupString

returns text in UTF-8 encoding.

.LP

Each string returned by

.ZN XmbLookupString

and

.ZN XwcLookupString

begins in the initial state of the encoding of the locale

(if the encoding of the locale is state-dependent).

.LP

Note: To ensure proper input processing,

it is essential that the client pass only 

.ZN KeyPress

events to

.ZN XmbLookupString ,

.ZN XwcLookupString

and

.ZN Xutf8LookupString .

Their behavior when a client passes a 

.ZN KeyRelease

event is undefined.

.LP

Clients should check the status_return argument before

using the other returned values.

These three functions each return a value to status_return 

that indicates what has been returned in the other arguments.

The possible values returned are:

.TS

lw(1.5i) lw(4.3i).

T{

.ZN XBufferOverflow

T}	T{

The input string to be returned is too large for the supplied buffer_return.

The required size (for

.ZN XmbLookupString ,

.ZN Xutf8LookupString

in bytes; for

.ZN XwcLookupString

in characters) is returned as the value of the function,

and the contents of buffer_return and keysym_return are not modified.

The client should recall the function with the same event

and a buffer of adequate size to obtain the string.

T}

T{

.ZN XLookupNone

T}	T{

No consistent input has been composed so far.

The contents of buffer_return and keysym_return are not modified, 

and the function returns zero.

T}

T{

.ZN XLookupChars

T}	T{

Some input characters have been composed.

They are placed in the buffer_return argument, using the encoding

described above,

and the string length is returned as the value of the function.

The content of the keysym_return argument is not modified.

T}

T{

.ZN XLookupKeySym

T}	T{

A KeySym has been returned instead of a string

and is returned in keysym_return.

The content of the buffer_return argument is not modified,

and the function returns zero.

T}

T{

.ZN XLookupBoth

T}	T{

Both a KeySym and a string are returned;

.ZN XLookupChars

and

.ZN XLookupKeySym

occur simultaneously.

T}

.TE

.LP

It does not make any difference if the input context passed as an argument to

.ZN XmbLookupString ,

.ZN XwcLookupString

and

.ZN Xutf8LookupString

is the one currently in possession of the focus or not.

Input may have been composed within an input context before it lost the focus,

and that input may be returned on subsequent calls to

.ZN XmbLookupString ,

.ZN XwcLookupString

or

.ZN Xutf8LookupString

even though it does not have any more keyboard focus.

.LP

The function

.ZN Xutf8LookupString

is an extension introduced by The XFree86 Project, Inc. in their 4.0.2

release. Its presence is

indicated by the macro

.ZN X_HAVE_UTF8_STRING .

.SH "SEE ALSO"

XLookupKeysym(__libmansuffix__),

Compose(__filemansuffix__)

.br

\fI\*(xL\fP