Adds the ability for save dialogs to take a default extension....

chrome/common/win_util.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_WIN_UTIL_H__
 #define CHROME_COMMON_WIN_UTIL_H__
 
 #include <objbase.h>
 
 #include <string>
@@ skipping 107 matching lines @@
 // zone on all downloads. This function is equivalent to OpenItemViaShell
 // without showing the zone warning dialog.
 bool OpenItemViaShellNoZoneCheck(const std::wstring& full_path,
                                  bool ask_for_app);
 
 // Ask the user, via the Windows "Open With" dialog, for an application to use
 // to open the file specified by 'full_path'.
 // Returns 'true' on successful open, 'false' otherwise.
 bool OpenItemWithExternalApp(const std::wstring& full_path);
 
+std::wstring GetFileFilterFromPath(const std::wstring& file_name);
+
 // Prompt the user for location to save a file. 'suggested_name' is a full path
 // that gives the dialog box a hint as to how to initialize itself.
 // For example, a 'suggested_name' of:
 //   "C:\Documents and Settings\jojo\My Documents\picture.png"
 // will start the dialog in the "C:\Documents and Settings\jojo\My Documents\"
 // directory, and filter for .png file types.
 // 'owner' is the window to which the dialog box is modal, NULL for a modeless
 // dialog box.
 // On success,  returns true and 'final_name' contains the full path of the file
 // that the user chose. On error, returns false, and 'final_name' is not
 // modified.
 // NOTE: DO NOT CALL THIS FUNCTION DIRECTLY! Instead use the helper objects in
 //       browser/shell_dialogs.cc to do this asynchronously on a different
 //       thread so that the app isn't jankified if the Windows shell dialog
 //       takes a long time to display.
 bool SaveFileAs(HWND owner,
                 const std::wstring& suggested_name,
                 std::wstring* final_name);
 
 // Prompt the user for location to save a file.
 // Callers should provide the filter string, and also a filter index.
 // The parameter |index| indicates the initial index of filter description
 // and filter pattern for the dialog box. If |index| is zero or greater than
 // the number of total filter types, the system uses the first filter in the
-// |filter| buffer. The parameter |final_name| returns the file name which
-// contains the drive designator, path, file name, and extension of the user
-// selected file name.
+// |filter| buffer. |index| is used to specify the initial selected extension,
+// and when done contains the extension the user chose. The parameter
+// |final_name| returns the file name which contains the drive designator,
+// path, file name, and extension of the user selected file name. |def_ext| is
+// the default extension to give to the file if the user did not enter an
+// extension.
 bool SaveFileAsWithFilter(HWND owner,
                           const std::wstring& suggested_name,
                           const wchar_t* filter,
                           const std::wstring& def_ext,
                           unsigned* index,
                           std::wstring* final_name);
 
 // If the window does not fit on the default monitor, it is moved and possibly
 // resized appropriately.
 void AdjustWindowToFit(HWND hwnd);
@@ skipping 64 matching lines @@
                const std::wstring& caption,
                UINT flags);
 
 // Returns the system set window title font.
 ChromeFont GetWindowTitleFont();
 
 }  // namespace win_util
 
 #endif  // WIN_COMMON_WIN_UTIL_H__