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
11namespace cloud_print {
12
13namespace {
14
15// Google Update related constants.
16const wchar_t kClientStateKey[] = L"SOFTWARE\\Google\\Update\\ClientState\\";
17const wchar_t* kUsageKey = L"dr";
18
19}  // namespace
20
21HRESULT GetLastHResult() {
22  DWORD error_code = GetLastError();
23  return error_code ? HRESULT_FROM_WIN32(error_code) : E_FAIL;
24}
25
26base::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
40base::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
50void 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
62