1Tk_ClipboardClear(3)         Tk Library Procedures        Tk_ClipboardClear(3)
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NAME

8       Tk_ClipboardClear, Tk_ClipboardAppend - Manage the clipboard
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SYNOPSIS

11       #include <tk.h>
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13       int
14       Tk_ClipboardClear(interp, tkwin)
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16       int
17       Tk_ClipboardAppend(interp, tkwin, target, format, buffer)
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ARGUMENTS

20       Tcl_Interp *interp (in)               Interpreter  to use for reporting
21                                             errors.
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23       Tk_Window tkwin (in)                  Window that determines which dis‐
24                                             play's clipboard to manipulate.
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26       Atom target (in)                      Conversion  type  for  this clip‐
27                                             board item;  has same meaning  as
28                                             target  argument to Tk_CreateSel‐
29                                             Handler.
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31       Atom format (in)                      Representation to use  when  data
32                                             is  retrieved;   has same meaning
33                                             as format argument to  Tk_Create‐
34                                             SelHandler.
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36       const char *buffer (in)               Null terminated string containing
37                                             the data to be  appended  to  the
38                                             clipboard.
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DESCRIPTION

42       These  two  procedures  manage  the clipboard for Tk.  The clipboard is
43       typically managed  by  calling  Tk_ClipboardClear  once,  then  calling
44       Tk_ClipboardAppend to add data for any number of targets.
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46       Tk_ClipboardClear  claims  the  CLIPBOARD  selection and frees any data
47       items previously stored on the clipboard in this application.  It  nor‐
48       mally  returns  TCL_OK, but if an error occurs it returns TCL_ERROR and
49       leaves an error message in interpreter interp's result.   Tk_Clipboard‐
50       Clear  must be called before a sequence of Tk_ClipboardAppend calls can
51       be issued.
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53       Tk_ClipboardAppend appends a buffer of  data  to  the  clipboard.   The
54       first  buffer for a given target determines the format for that target.
55       Any successive appends for that target must have the same format or  an
56       error  will be returned.  Tk_ClipboardAppend returns TCL_OK if the buf‐
57       fer is successfully copied onto the clipboard.  If the clipboard is not
58       currently  owned  by  the application, either because Tk_ClipboardClear
59       has not been called or because ownership of the clipboard  has  changed
60       since  the  last  call to Tk_ClipboardClear, Tk_ClipboardAppend returns
61       TCL_ERROR and leaves an error message  in  the  result  of  interpreter
62       interp.
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64       In order to guarantee atomicity, no event handling should occur between
65       Tk_ClipboardClear and the following Tk_ClipboardAppend calls (otherwise
66       someone  could retrieve a partially completed clipboard or claim owner‐
67       ship away from this application).
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69       Tk_ClipboardClear  may  invoke  callbacks,  including   arbitrary   Tcl
70       scripts,  as a result of losing the CLIPBOARD selection, so any calling
71       function should take care to be re-entrant at the  point  Tk_Clipboard‐
72       Clear is invoked.
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KEYWORDS

75       append, clipboard, clear, format, type
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79Tk                                    4.0                 Tk_ClipboardClear(3)