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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_COMPHELPER_WINDOWSERRORSTRING_HXX
#define INCLUDED_COMPHELPER_WINDOWSERRORSTRING_HXX
#include <prewin.h>
#include <postwin.h>
#include <rtl/ustring.hxx>
#include <o3tl/char16_t2wchar_t.hxx>
namespace comphelper
{
inline OUString WindowsErrorString(DWORD nErrorCode)
{
LPWSTR pMsgBuf;
if (FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
nErrorCode,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
reinterpret_cast<LPWSTR>(&pMsgBuf),
0,
nullptr) == 0)
return OUString::number(nErrorCode, 16);
OUString result(o3tl::toU(pMsgBuf));
result.endsWith("\r\n", &result);
HeapFree(GetProcessHeap(), 0, pMsgBuf);
return result;
}
inline OUString WindowsErrorStringFromHRESULT(HRESULT hr)
{
// See https://devblogs.microsoft.com/oldnewthing/20061103-07/?p=29133
// Also https://social.msdn.microsoft.com/Forums/vstudio/en-US/c33d9a4a-1077-4efd-99e8-0c222743d2f8
// (which refers to https://msdn.microsoft.com/en-us/library/aa382475)
// explains why can't we just reinterpret_cast HRESULT to DWORD Win32 error:
// we might actually have a Win32 error code converted using HRESULT_FROM_WIN32 macro
DWORD nErrorCode = DWORD(hr);
if (HRESULT(hr & 0xFFFF0000) == MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIN32, 0) || hr == S_OK)
{
nErrorCode = HRESULT_CODE(hr);
// https://msdn.microsoft.com/en-us/library/ms679360 mentions that the codes might have
// high word bits set (e.g., bit 29 could be set if error comes from a 3rd-party library).
// So try to restore the original error code to avoid wrong error messages
DWORD nLastError = GetLastError();
if ((nLastError & 0xFFFF) == nErrorCode)
nErrorCode = nLastError;
}
return WindowsErrorString(nErrorCode);
}
} // namespace comphelper
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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