## Tcl8.6.2/Tk8.6.2 Documentation > Tk C API, version 8.6.2 > Clipboard

### Tcl/Tk Applications | Tcl Commands | Tk Commands | [incr Tcl] Package Commands | SQLite3 Package Commands | TDBC Package Commands | tdbc::mysql Package Commands | tdbc::odbc Package Commands | tdbc::postgres Package Commands | tdbc::sqlite3 Package Commands | Thread Package Commands | Tcl C API | Tk C API | [incr Tcl] Package C API | TDBC Package C API

  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
  DESCRIPTION
  KEYWORDS

### 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.

const 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 interpreter interp's 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 the result of interpreter interp.

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 re-entrant 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.