Aegisub/aegisub/libaegisub/windows/util_win.cpp
2013-02-06 13:22:16 -08:00

78 lines
2.6 KiB
C++

// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/// @file util.cpp
/// @brief Windows utility methods.
/// @ingroup libaegisub windows
#include "../config.h"
#include "libaegisub/util.h"
#include "libaegisub/util_win.h"
#include "libaegisub/charset_conv_win.h"
namespace agi {
namespace util {
using agi::charset::ConvertW;
std::string ErrorString(DWORD error) {
LPWSTR lpstr = nullptr;
if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, nullptr, error, 0, reinterpret_cast<LPWSTR>(&lpstr), 0, nullptr) == 0) {
/// @todo Return the actual 'unknown error' string from windows.
return "Unknown Error";
}
std::string str = ConvertW(lpstr);
LocalFree(lpstr);
return str;
}
/// @brief Get seconds and microseconds.
/// @param tv[out] agi_timeval struct
/// This code is from http://www.suacommunity.com/dictionary/gettimeofday-entry.php
agi_timeval time_log() {
#define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
// Define a structure to receive the current Windows filetime
FILETIME ft;
// Initialize the present time to 0 and the timezone to UTC
unsigned __int64 tmpres = 0;
GetSystemTimeAsFileTime(&ft);
// The GetSystemTimeAsFileTime returns the number of 100 nanosecond
// intervals since Jan 1, 1601 in a structure. Copy the high bits to
// the 64 bit tmpres, shift it left by 32 then or in the low 32 bits.
tmpres |= ft.dwHighDateTime;
tmpres <<= 32;
tmpres |= ft.dwLowDateTime;
// Convert to microseconds by dividing by 10
tmpres /= 10;
// The Unix epoch starts on Jan 1 1970. Need to subtract the difference
// in seconds from Jan 1 1601.
tmpres -= DELTA_EPOCH_IN_MICROSECS;
// Finally change microseconds to seconds and place in the seconds value.
// The modulus picks up the microseconds.
agi_timeval tv = { (long)(tmpres / 1000000UL), (long)(tmpres % 1000000UL) };
return tv;
}
} // namespace io
} // namespace agi