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tk_getOpenFile(n)	     Tk Built-In Commands	     tk_getOpenFile(n)


       tk_getOpenFile,	tk_getSaveFile	-  pop up a dialog box for the user to
       select a file to open or save.

       tk_getOpenFile ?option value ...?
       tk_getSaveFile ?option value ...?

       The procedures tk_getOpenFile and tk_getSaveFile pop up	a  dialog  box
       for  the user to select a file to open or save. The tk_getOpenFile com‐
       mand is usually associated with the Open command in the File menu.  Its
       purpose	is  for	 the user to select an existing file only. If the user
       enters an non-existent file, the dialog box gives  the  user  an	 error
       prompt  and  requires  the user to give an alternative selection. If an
       application allows the user to create new files, it  should  do	so  by
       providing a separate New menu command.

       The  tk_getSaveFile command is usually associated with the Save as com‐
       mand in the File menu. If the user enters a file that  already  exists,
       the  dialog  box prompts the user for confirmation whether the existing
       file should be overwritten or not.

       The following option-value pairs are possible as command line arguments
       to these two commands:

       -defaultextension extension
	      Specifies	 a string that will be appended to the filename if the
	      user enters a filename without an extension. The defaut value is
	      the  empty  string, which means no extension will be appended to
	      the filename in any case. This option is ignored on  the	Macin‐
	      tosh platform, which does not require extensions to filenames.

       -filetypes filePatternList
	      If a File types listbox exists in the file dialog on the partic‐
	      ular platform, this option gives the filetypes in this  listbox.
	      When  the	 user choose a filetype in the listbox, only the files
	      of that type are listed. If this option is unspecified, or if it
	      is  set  to  the empty list, or if the File types listbox is not
	      supported by the particular platform then all files  are	listed
	      regardless  of their types. See the section SPECIFYING FILE PAT‐
	      TERNS below for a discussion on the contents of filePatternList.

       -initialdir directory
	      Specifies that the files in directory should be  displayed  when
	      the dialog pops up. If this parameter is not specified, then the
	      files in the current working directory  are  displayed.  If  the
	      parameter	 specifies a relative path, the return value will con‐
	      vert the relative path to an absolute path.  This option may not
	      always  work  on	the Macintosh.	This is not a bug. Rather, the
	      General Controls control panel on the Mac allows the end user to
	      override the application default directory.

       -initialfile filename
	      Specifies	 a filename to be displayed in the dialog when it pops
	      up. This option is ignored by the tk_getOpenFile command.

       -parent window
	      Makes window the logical parent of the  file  dialog.  The  file
	      dialog is displayed on top of its parent window.

       -title titleString
	      Specifies a string to display as the title of the dialog box. If
	      this option is not specified, then a default title is displayed.
	      This option is ignored on the Macintosh platform.

       If  the	user  selects  a  file, both tk_getOpenFile and tk_getSaveFile
       return the full pathname of this file. If the user cancels  the	opera‐
       tion, both commands return the empty string.

       The  filePatternList  value given by the -filetypes option is a list of
       file patterns. Each file pattern is a list of the form
	      typeName {extension ?extension ...?} ?{macType ?macType ...?}?
       typeName is the name of the file type described by  this	 file  pattern
       and  is	the text string that appears in the File types listbox. exten‐
       sion is a file extension for this file pattern.	 macType  is  a	 four-
       character Macintosh file type. The list of macTypes is optional and may
       be omitted for applications that do not need to execute on  the	Macin‐
       tosh platform.

       Several	file  patterns	may have the same typeName, in which case they
       refer to the same file type and share the same entry  in	 the  listbox.
       When the user selects an entry in the listbox, all the files that match
       at least one of the file	 patterns  corresponding  to  that  entry  are
       listed.	Usually,  each	file pattern corresponds to a distinct type of
       file. The use of more than one file patterns for one type  of  file  is
       necessary on the Macintosh platform only.

       On  the	Macintosh  platform, a file matches a file pattern if its name
       matches at least one of the extension(s) AND it belongs to at least one
       of  the macType(s) of the file pattern. For example, the C Source Files
       file pattern in the sample code matches	with  files  that  have	 a  .c
       extension  AND  belong to the macType TEXT. To use the OR rule instead,
       you can use two file patterns, one with the  extensions	only  and  the
       other with the macType only. The GIF Files file type in the sample code
       matches files that EITHER have a .gif extension OR belong to  the  mac‐
       Type GIFF.

       On the Unix and Windows platforms, a file matches a file pattern if its
       name matches at at least one of the extension(s) of the	file  pattern.
       The macTypes are ignored.

       On the Unix and Macintosh platforms, extensions are matched using glob-
       style pattern  matching.	 On  the  Windows  platforms,  extensions  are
       matched	by  the	 underlying  operating	system.	 The types of possible
       extensions are: (1) the special extension * matches any file;  (2)  the
       special	extension  ""  matches any files that do not have an extension
       (i.e., the filename contains no full stop character); (3) any character
       string that does not contain any wild card characters (* and ?).

       Due  to	the different pattern matching rules on the various platforms,
       to ensure portability, wild card characters  are	 not  allowed  in  the
       extensions,  except as in the special extension *. Extensions without a
       full stop character (e.g, ~) are allowed but may not work on all	 plat‐

	      set types {
		  {{Text Files}	      {.txt}	    }
		  {{TCL Scripts}      {.tcl}	    }
		  {{C Source Files}   {.c}	TEXT}
		  {{GIF Files}	      {.gif}	    }
		  {{GIF Files}	      {}	GIFF}
		  {{All Files}	      *		    }
	      set filename [tk_getOpenFile -filetypes $types]

	      if {$filename != ""} {
		  # Open the file ...

       file selection dialog

Tk				      4.2		     tk_getOpenFile(n)

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