Resurrect the cloud printer driver.

cloud_print/common/win/cloud_print_utils.cc

+// Copyright 2013 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.
+
+#include "cloud_print/common/win/cloud_print_utils.h"
+
+#include <windows.h>
+
+#include "base/win/registry.h"
+
+namespace cloud_print {
+
+namespace {
+
+// Google Update related constants.
+const wchar_t kClientStateKey[] = L"SOFTWARE\\Google\\Update\\ClientState\\";
+const wchar_t* kUsageKey = L"dr";
+
+}  // namespace
+
+HRESULT GetLastHResult() {
+  DWORD error_code = GetLastError();
+  return error_code ? HRESULT_FROM_WIN32(error_code) : E_FAIL;
+}
+
+base::string16 LoadLocalString(DWORD id) {
+  static wchar_t dummy = L'\0';
+  HMODULE module = NULL;
+  ::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT |
+                          GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
+                      &dummy, &module);
+  LPCWSTR buffer = NULL;
+  // If the last parameter is 0, LoadString assume that 3rd parameter type is
+  // LPCWSTR* and assign pointer to read-only memory with resource.
+  int count = ::LoadString(module, id, reinterpret_cast<LPWSTR>(&buffer), 0);
+  if (!buffer)
+    return base::string16();
+  return base::string16(buffer, buffer + count);
+}
+
+base::string16 GetErrorMessage(HRESULT hr) {
+  LPWSTR buffer = NULL;
+  ::FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |
+                      FORMAT_MESSAGE_ALLOCATE_BUFFER,
+                  0, hr, 0, reinterpret_cast<LPWSTR>(&buffer), 0, NULL);
+  base::string16 result(buffer);
+  ::LocalFree(buffer);
+  return result;
+}
+
+void SetGoogleUpdateUsage(const base::string16& product_id) {
+  // Set appropriate key to 1 to let Omaha record usage.
+  base::win::RegKey key;
+  if (key.Create(HKEY_CURRENT_USER, (kClientStateKey + product_id).c_str(),
+                 KEY_SET_VALUE) != ERROR_SUCCESS ||
+      key.WriteValue(kUsageKey, L"1") != ERROR_SUCCESS) {
+    LOG(ERROR) << "Unable to set usage key";
+  }
+}
+
+}  // namespace cloud_print