cloud_print/common/win/cloud_print_utils.cc

   1 // Copyright 2013 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 "cloud_print/common/win/cloud_print_utils.h"
   6
   7 #include <windows.h>
   8
   9 #include "base/win/registry.h"
  10
  11 namespace cloud_print {
  12
  13 namespace {
  14
  15 // Google Update related constants.
  16 const wchar_t kClientStateKey[] = L"SOFTWARE\\Google\\Update\\ClientState\\";
  17 const wchar_t* kUsageKey = L"dr";
  18
  19 }  // namespace
  20
  21 HRESULT GetLastHResult() {
  22   DWORD error_code = GetLastError();
  23   return error_code ? HRESULT_FROM_WIN32(error_code) : E_FAIL;
  24 }
  25
  26 base::string16 LoadLocalString(DWORD id) {
  27   static wchar_t dummy = L'\0';
  28   HMODULE module = NULL;
  29   ::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT |
  30                       GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, &dummy, &module);
  31   LPCWSTR buffer = NULL;
  32   // If the last parameter is 0, LoadString assume that 3rd parameter type is
  33   // LPCWSTR* and assign pointer to read-only memory with resource.
  34   int count = ::LoadString(module, id, reinterpret_cast<LPWSTR>(&buffer), 0);
  35   if (!buffer)
  36     return base::string16();
  37   return base::string16(buffer, buffer + count);
  38 }
  39
  40 base::string16 GetErrorMessage(HRESULT hr) {
  41   LPWSTR buffer = NULL;
  42   ::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |
  43                   FORMAT_MESSAGE_ALLOCATE_BUFFER,
  44                   0, hr, 0, reinterpret_cast<LPWSTR>(&buffer), 0, NULL);
  45   base::string16 result(buffer);
  46   ::LocalFree(buffer);
  47   return result;
  48 }
  49
  50 void SetGoogleUpdateUsage(const base::string16& product_id) {
  51   // Set appropriate key to 1 to let Omaha record usage.
  52   base::win::RegKey key;
  53   if (key.Create(HKEY_CURRENT_USER,
  54                  (kClientStateKey + product_id).c_str(),
  55                  KEY_SET_VALUE) != ERROR_SUCCESS ||
  56       key.WriteValue(kUsageKey, L"1") != ERROR_SUCCESS) {
  57     LOG(ERROR) << "Unable to set usage key";
  58   }
  59 }
  60
  61 }  // namespace cloud_print