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LogFile_WIN32.cpp
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133 lines (112 loc) · 3.76 KB
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//
// LogFile_WIN32.cpp
//
// $Id: //poco/1.4/Foundation/src/LogFile_WIN32.cpp#1 $
//
// Library: Foundation
// Package: Logging
// Module: LogFile
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/LogFile_WIN32.h"
#include "Poco/File.h"
#include "Poco/Exception.h"
namespace Poco {
LogFileImpl::LogFileImpl(const std::string& path): _path(path), _hFile(INVALID_HANDLE_VALUE)
{
File file(path);
if (file.exists())
{
if (0 == sizeImpl())
_creationDate = file.getLastModified();
else
_creationDate = file.created();
}
}
LogFileImpl::~LogFileImpl()
{
CloseHandle(_hFile);
}
void LogFileImpl::writeImpl(const std::string& text, bool flush)
{
if (INVALID_HANDLE_VALUE == _hFile) createFile();
DWORD bytesWritten;
BOOL res = WriteFile(_hFile, text.data(), (DWORD) text.size(), &bytesWritten, NULL);
if (!res) throw WriteFileException(_path);
res = WriteFile(_hFile, "\r\n", 2, &bytesWritten, NULL);
if (!res) throw WriteFileException(_path);
if (flush)
{
res = FlushFileBuffers(_hFile);
if (!res) throw WriteFileException(_path);
}
}
UInt64 LogFileImpl::sizeImpl() const
{
if (INVALID_HANDLE_VALUE == _hFile)
{
File file(_path);
if (file.exists()) return file.getSize();
else return 0;
}
LARGE_INTEGER li;
li.HighPart = 0;
li.LowPart = SetFilePointer(_hFile, 0, &li.HighPart, FILE_CURRENT);
return li.QuadPart;
}
Timestamp LogFileImpl::creationDateImpl() const
{
return _creationDate;
}
const std::string& LogFileImpl::pathImpl() const
{
return _path;
}
void LogFileImpl::createFile()
{
_hFile = CreateFileA(_path.c_str(), GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (_hFile == INVALID_HANDLE_VALUE) throw OpenFileException(_path);
SetFilePointer(_hFile, 0, 0, FILE_END);
// There seems to be a strange "optimization" in the Windows NTFS
// filesystem that causes it to reuse directory entries of deleted
// files. Example:
// 1. create a file named "test.dat"
// note the file's creation date
// 2. delete the file "test.dat"
// 3. wait a few seconds
// 4. create a file named "test.dat"
// the new file will have the same creation
// date as the old one.
// We work around this bug by taking the file's
// modification date as a reference when the
// file is empty.
if (sizeImpl() == 0)
_creationDate = File(_path).getLastModified();
else
_creationDate = File(_path).created();
}
} // namespace Poco