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- '\"
- '\" Copyright 1990 Regents of the University of California
- '\" Permission to use, copy, modify, and distribute this
- '\" documentation for any purpose and without fee is hereby
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- '\" The University of California makes no representations about
- '\" the suitability of this material for any purpose. It is
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- '\"
- '\" $Header: /user6/ouster/wish/man/RCS/GetSelect.man,v 1.4 91/12/06 10:39:18 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Sprite
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- .HS Tk_GetSelection tk
- .BS
- .SH NAME
- Tk_GetSelection \- retrieve the contents of the selection
- .SH SYNOPSIS
- .nf
- \fB#include <tk.h>\fR
- .sp
- int
- \fBTk_GetSelection\fR(\fIinterp, tkwin, target, proc, clientData\fR)
- .SH ARGUMENTS
- .AS Tk_GetSelProc clientData
- .AP Tcl_Interp *interp in
- Interpreter to use for reporting errors.
- .AP Tk_Window tkwin in
- Window on whose behalf to retrieve the selection (determines
- display from which to retrieve).
- .AP Atom target in
- Form in which to retrieve selection.
- .AP Tk_GetSelProc *proc in
- Procedure to invoke to process pieces of the selection as they
- are retrieved.
- .AP ClientData clientData in
- Arbitrary one-word value to pass to \fIproc\fR.
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTk_GetSelection\fR retrieves the selection in the format
- specified by \fItarget\fR. The selection may actually be
- retrieved in several pieces; as each piece is retrieved,
- \fIproc\fR is called to process the piece. \fIProc\fR should
- have arguments and result that match the type \fBTk_GetSelProc\fR:
- .nf
- .RS
- typedef int Tk_GetSelProc(
- .RS
- ClientData \fIclientData\fR,
- Tcl_Interp *\fIinterp\fR,
- char *\fIportion\fR);
- .RE
- .RE
- .fi
- The \fIclientData\fP and \fIinterp\fR parameters to \fIproc\fR
- will be copies of the corresponding arguments to
- \fBTk_GetSelection\fR. \fIPortion\fR will be a pointer to
- a string containing part or all of the selection. For large
- selections, \fIproc\fR will be called several times with sucessive
- portions of the selection. The X Inter-Client Communication
- Conventions Manual allows the selection to be returned in formats
- other than strings, e.g. as an array of atoms or integers. If
- this happens, Tk converts the selection back into a string
- before calling \fIproc\fR. If the selection is returned as an
- array of atoms, Tk converts it to a string containing the atom names
- separated by white space. For any other format besides string,
- Tk converts the selection to a string containing hexadecimal
- values separated by white space.
- .PP
- \fBTk_GetSelection\fR returns to its caller when the selection has
- been completely retrieved and processed by \fIproc\fR, or when a
- fatal error has occurred (e.g. the selection owner didn't respond
- promptly). \fBTk_GetSelection\fR normally returns TCL_OK; if
- an error occurs, it returns TCL_ERROR and leaves an error message
- in \fIinterp->result\fR. \fIProc\fR should also return either
- TCL_OK or TCL_ERROR. If \fIproc\fR encounters an error in dealing with the
- selection, it should leave an error message in \fIinterp->result\fR
- and return TCL_ERROR; this will abort the selection retrieval.
-
- .SH KEYWORDS
- format, get, selection retrieval
-