base/guid_win.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/guid.h"
   6
   7 #include <stdlib.h>
   8
   9 #include <objbase.h>
  10 #include <windows.h>
  11
  12 #include "base/basictypes.h"
  13 #include "base/logging.h"
  14 #include "base/string_util.h"
  15 #include "base/strings/utf_string_conversions.h"
  16
  17 namespace base {
  18
  19 std::string GenerateGUID() {
  20   const int kGUIDSize = 39;
  21
  22   GUID guid;
  23   HRESULT guid_result = CoCreateGuid(&guid);
  24   DCHECK(SUCCEEDED(guid_result));
  25   if (!SUCCEEDED(guid_result))
  26     return std::string();
  27
  28   std::wstring guid_string;
  29   int result = StringFromGUID2(guid,
  30                                WriteInto(&guid_string, kGUIDSize), kGUIDSize);
  31   DCHECK(result == kGUIDSize);
  32   if (result != kGUIDSize)
  33     return std::string();
  34
  35   return WideToUTF8(guid_string.substr(1, guid_string.length() - 2));
  36 }
  37
  38 }  // namespace guid