errors.cpp

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/* 
 * Confdump-Agent - Dump static and runtime system configuration
 * Copyright (C) 2009-2012  Straton IT, SAS
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <windows.h>

#include "boost/shared_ptr.hpp"
#include "Confdump/System/Win32/errors.hpp"

namespace Confdump
{
namespace System
{
namespace Win32
{

SystemError::SystemError( DWORD rc, QString action )
 : RuntimeError( "Unspecified win32 error: "+action ), // overwritten
   errorCode_( rc ), action_( action )
{
    setMessage( QString( "Failed to %1: %2 (%3)" )
        .arg( action )
        .arg( errorDescription() )
        .arg( errorCodeAsHex() ) );
}

SystemError::~SystemError()
{
}

QString SystemError::errorCodeAsHex() const
{
    return "0x" + QString::number( errorCode_, 16 );
}

QString SystemError::errorDescription() const
{
    TCHAR *raw_buffer = 0;
    DWORD rc = FormatMessage( 
        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        errorCode_,
        MAKELANGID( LANG_NEUTRAL, SUBLANG_DEFAULT ), // Default language
        reinterpret_cast<LPTSTR>( &raw_buffer ),
        0,              // buffer initial size
        NULL );         // arguments
    if ( !rc )
        return "Unknown (could not get the system error message)";
    boost::shared_ptr<TCHAR> buffer( raw_buffer, LocalFree );

    return QString::fromWCharArray( buffer.get() );
}


void throwOnWin32Error( DWORD rc, QString action )
{
    if ( rc != NO_ERROR )
        throw SystemError( rc, action );
}


}
}
}