Quelle windowserrorstring.hxx Sprache: C

/* -*- 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: */

quality100%

¤ Dauer der Verarbeitung: 0.19 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.