Provided by: libx11-doc_1.4.99.1-0ubuntu2_all bug


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


       int XmbLookupString(XIC ic, XKeyPressedEvent *event, char
              *buffer_return, int bytes_buffer, KeySym *keysym_return, Status

       int XwcLookupString(XIC ic, XKeyPressedEvent *event, wchar_t
              *buffer_return, int wchars_buffer, KeySym *keysym_return, Status

       int Xutf8LookupString(XIC ic, XKeyPressedEvent *event, char
              *buffer_return, int bytes_buffer, KeySym *keysym_return, Status


                 Returns a multibyte string or wide character string (if any)
                 from the input method.

                 Specifies space available in the return buffer.

       event     Specifies the key event to be used.

       ic        Specifies the input context.

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

                 Returns a value indicating what kind of data is returned.


       The XmbLookupString, XwcLookupString and 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

       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.

       XmbLookupString and Xutf8LookupString return the length of the string
       in bytes, and XwcLookupString returns the length of the string in
       characters.  Both XmbLookupString and XwcLookupString return text in
       the encoding of the locale bound to the input method of the specified
       input context, and Xutf8LookupString returns text in UTF-8 encoding.

       Each string returned by XmbLookupString and XwcLookupString begins in
       the initial state of the encoding of the locale (if the encoding of the
       locale is state-dependent).


            ®To ensure proper input processing, it is essential that the
            client pass only KeyPress events to XmbLookupString,
            XwcLookupString and Xutf8LookupString.  Their behavior when a
            client passes a KeyRelease event is undefined.

       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:

       XBufferOverflow   The input string to be returned is too
                         large for the supplied buffer_return.  The
                         required size (for XmbLookupString,
                         Xutf8LookupString in bytes; for
                         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
       XLookupNone       No consistent input has been composed so
                         far.  The contents of buffer_return and
                         keysym_return are not modified, and the
                         function returns zero.
       XLookupChars      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.
       XLookupKeySym     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
       XLookupBoth       Both a KeySym and a string are returned;
                         XLookupChars and XLookupKeySym occur

       It does not make any difference if the input context passed as an
       argument to XmbLookupString, XwcLookupString and 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 XmbLookupString,
       XwcLookupString or Xutf8LookupString even though it does not have any
       more keyboard focus.

       The function Xutf8LookupString is an extension introduced by The
       XFree86 Project, Inc. in their 4.0.2 release. Its presence is indicated
       by the macro X_HAVE_UTF8_STRING.


       XLookupKeysym(3), Compose(5)
       Xlib - C Language X Interface