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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/win/scoped_ole_initializer.h"
#include <ole2.h>
#include <ostream>
#include "base/check_op.h"
#include "base/win/resource_exhaustion.h"
namespace ui {
ScopedOleInitializer::ScopedOleInitializer() {
hr_ = OleInitialize(NULL);
DCHECK_NE(OLE_E_WRONGCOMPOBJ, hr_) << "Incompatible DLLs on machine";
DCHECK_NE(RPC_E_CHANGED_MODE, hr_) << "Invalid COM thread model change";
// OleInitialize is calling CoInitializeEx to initialize COM. CoInitializeEx
// may call RegisterClassEx to get an ATOM. On failure, the call to
// RegisterClassEx sets the last error code to ERROR_NOT_ENOUGH_MEMORY.
// CoInitializeEx is retuning the converted error code
// (a.k.a HRESULT_FROM_WIN32(...)). The following code handles the case
// where HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY) is being returned by
// CoInitializeEx. We assume they are due to ATOM exhaustion. This appears to
// happen most often when the browser is being driven by automation tools,
// though the underlying reason for this remains a mystery
// (https://crbug.com/1470483). There is nothing that Chrome can do to
// meaningfully run until the user restarts their session by signing out of
// Windows or restarting their computer.
if (hr_ == HRESULT_FROM_WIN32(ERROR_NOT_ENOUGH_MEMORY)) {
base::win::OnResourceExhausted();
}
}
ScopedOleInitializer::~ScopedOleInitializer() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (SUCCEEDED(hr_))
OleUninitialize();
}
} // namespace ui
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