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82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
// sktoolslib - common files for SK tools
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// Copyright (C) 2012, 2017, 2020 - Stefan Kueng
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software Foundation,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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#pragma once
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/**
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* A wrapper class for calling the FormatMessage() Win32 function and controlling
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* the lifetime of the allocated error message buffer.
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*/
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class CFormatMessageWrapper
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{
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private:
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LPWSTR buffer;
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DWORD result;
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void release();
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void obtainMessage() { obtainMessage(::GetLastError()); }
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void obtainMessage(DWORD errorCode);
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public:
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CFormatMessageWrapper()
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: buffer(nullptr)
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, result(0)
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{
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obtainMessage();
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}
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CFormatMessageWrapper(DWORD lastError)
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: buffer(nullptr)
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, result(0)
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{
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obtainMessage(lastError);
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}
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~CFormatMessageWrapper() { release(); }
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operator LPCWSTR() const { return buffer; }
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operator bool() const { return result != 0; }
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bool operator!() const { return result == 0; }
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LPCWSTR c_str() const { return buffer; }
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};
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inline void CFormatMessageWrapper::obtainMessage(DWORD errorCode)
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{
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// First of all release the buffer to make it possible to call this
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// method more than once on the same object.
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release();
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result = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr,
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errorCode,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
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(LPWSTR)&buffer,
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0,
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nullptr);
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}
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inline void CFormatMessageWrapper::release()
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{
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if (buffer != 0)
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{
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LocalFree(buffer);
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buffer = 0;
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}
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result = 0;
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}
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