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'\"
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'\" Copyright (c) 1990-1994 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" RCS: @(#) $Id: GetSelect.3,v 1.1.1.1 2002-01-16 10:25:48 markom Exp $
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'\"
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.so man.macros
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.TH Tk_GetSelection 3 4.0 Tk "Tk Library Procedures"
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.BS
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.SH NAME
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Tk_GetSelection \- retrieve the contents of a selection
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.SH SYNOPSIS
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.nf
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\fB#include \fR
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.sp
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int
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\fBTk_GetSelection\fR(\fIinterp, tkwin, selection, target, proc, clientData\fR)
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.SH ARGUMENTS
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.AS Tk_GetSelProc clientData
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.AP Tcl_Interp *interp in
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Interpreter to use for reporting errors.
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.AP Tk_Window tkwin in
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Window on whose behalf to retrieve the selection (determines
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display from which to retrieve).
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.AP Atom selection in
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The name of the selection to be retrieved.
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.AP Atom target in
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Form in which to retrieve selection.
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.AP Tk_GetSelProc *proc in
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Procedure to invoke to process pieces of the selection as they
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are retrieved.
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.AP ClientData clientData in
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Arbitrary one-word value to pass to \fIproc\fR.
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.BE
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.SH DESCRIPTION
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.PP
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\fBTk_GetSelection\fR retrieves the selection specified by the atom
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\fIselection\fR in the format specified by \fItarget\fR. The
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selection may actually be retrieved in several pieces; as each piece
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is retrieved, \fIproc\fR is called to process the piece. \fIProc\fR
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should have arguments and result that match the type
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\fBTk_GetSelProc\fR:
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.CS
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typedef int Tk_GetSelProc(
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ClientData \fIclientData\fR,
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Tcl_Interp *\fIinterp\fR,
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char *\fIportion\fR);
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.CE
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The \fIclientData\fR and \fIinterp\fR parameters to \fIproc\fR
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will be copies of the corresponding arguments to
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\fBTk_GetSelection\fR. \fIPortion\fR will be a pointer to
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a string containing part or all of the selection. For large
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selections, \fIproc\fR will be called several times with successive
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portions of the selection. The X Inter-Client Communication
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Conventions Manual allows a selection to be returned in formats
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other than strings, e.g. as an array of atoms or integers. If
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this happens, Tk converts the selection back into a string
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before calling \fIproc\fR. If a selection is returned as an
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array of atoms, Tk converts it to a string containing the atom names
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separated by white space. For any other format besides string,
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Tk converts a selection to a string containing hexadecimal
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values separated by white space.
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.PP
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\fBTk_GetSelection\fR returns to its caller when the selection has
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been completely retrieved and processed by \fIproc\fR, or when a
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fatal error has occurred (e.g. the selection owner didn't respond
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promptly). \fBTk_GetSelection\fR normally returns TCL_OK; if
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an error occurs, it returns TCL_ERROR and leaves an error message
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in \fIinterp->result\fR. \fIProc\fR should also return either
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TCL_OK or TCL_ERROR. If \fIproc\fR encounters an error in dealing with the
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selection, it should leave an error message in \fIinterp->result\fR
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and return TCL_ERROR; this will abort the selection retrieval.
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.SH KEYWORDS
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format, get, selection retrieval
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