NAME

Tk_ClipboardClear, Tk_ClipboardAppend - Manage the clipboard

SYNOPSIS

#include <tk.h>
int
Tk_ClipboardClear(interp, tkwin)
int
Tk_ClipboardAppend(interp, tkwin, target, format, buffer)

ARGUMENTS

Tcl_Interp *interp (in)
Interpreter to use for reporting errors.
Tk_Window tkwin (in)
Window that determines which display's clipboard to manipulate.
Atom target (in)
Conversion type for this clipboard item; has same meaning as target argument to Tk_CreateSelHandler.
Atom format (in)
Representation to use when data is retrieved; has same meaning as format argument to Tk_CreateSelHandler.
char *buffer (in)
Null terminated string containing the data to be appended to the clipboard.

DESCRIPTION

These two procedures manage the clipboard for Tk. The clipboard is typically managed by calling Tk_ClipboardClear once, then calling Tk_ClipboardAppend to add data for any number of targets.

Tk_ClipboardClear claims the CLIPBOARD selection and frees any data items previously stored on the clipboard in this application. It normally returns TCL_OK, but if an error occurs it returns TCL_ERROR and leaves an error message in interp->result. Tk_ClipboardClear must be called before a sequence of Tk_ClipboardAppend calls can be issued.

Tk_ClipboardAppend appends a buffer of data to the clipboard. The first buffer for a given target determines the format for that target. Any successive appends for that target must have the same format or an error will be returned. Tk_ClipboardAppend returns TCL_OK if the buffer is successfully copied onto the clipboard. If the clipboard is not currently owned by the application, either because Tk_ClipboardClear has not been called or because ownership of the clipboard has changed since the last call to Tk_ClipboardClear, Tk_ClipboardAppend returns TCL_ERROR and leaves an error message in interp->result.

In order to guarantee atomicity, no event handling should occur between Tk_ClipboardClear and the following Tk_ClipboardAppend calls (otherwise someone could retrieve a partially completed clipboard or claim ownership away from this application).

Tk_ClipboardClear may invoke callbacks, including arbitrary Tcl scripts, as a result of losing the CLIPBOARD selection, so any calling function should take care to be reentrant at the point Tk_ClipboardClear is invoked.

KEYWORDS

append, clipboard, clear, format, type 
Copyright © 1994 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.