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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 mozilla_WindowsEventLog_h
#define mozilla_WindowsEventLog_h
/**
* Report messages to the Windows Event Log.
*/
#include <stdio.h>
#include <windows.h>
#include "mozilla/Attributes.h"
#include "mozilla/UniquePtr.h"
/**
* This header is intended for self-contained, header-only, utility code for
* Win32. It may be used outside of xul.dll, in places such as
* default-browser-agent.exe or notificationrouter.dll. If your code creates
* dependencies on Mozilla libraries, you should put it elsewhere.
*/
#define MOZ_WIN_EVENT_LOG_ERROR(source, hr) \
mozilla::WriteWindowsEventLogHresult(source, hr, __FUNCTION__, __LINE__)
#define MOZ_WIN_EVENT_LOG_ERROR_MESSAGE(source, format, ...) \
mozilla::WriteWindowsEventLogErrorMessage(source, format, __FUNCTION__, \
__LINE__, ##__VA_ARGS__)
namespace mozilla {
static void WriteWindowsEventLogErrorBuffer(const wchar_t* eventSourceName,
const wchar_t* buffer,
DWORD eventId) {
HANDLE source = RegisterEventSourceW(nullptr, eventSourceName);
if (!source) {
// Not much we can do about this.
return;
}
const wchar_t* stringsArray[] = {buffer};
ReportEventW(source, EVENTLOG_ERROR_TYPE, 0, eventId, nullptr, 1, 0,
stringsArray, nullptr);
DeregisterEventSource(source);
}
void WriteWindowsEventLogHresult(const wchar_t* eventSourceName, HRESULT hr,
const char* sourceFile, int sourceLine) {
const wchar_t* format = L"0x%X in %S:%d";
int bufferSize = _scwprintf(format, hr, sourceFile, sourceLine);
++bufferSize; // Extra character for terminating null
mozilla::UniquePtr<wchar_t[]> errorStr =
mozilla::MakeUnique<wchar_t[]>(bufferSize);
_snwprintf_s(errorStr.get(), bufferSize, _TRUNCATE, format, hr, sourceFile,
sourceLine);
WriteWindowsEventLogErrorBuffer(eventSourceName, errorStr.get(), hr);
}
MOZ_FORMAT_WPRINTF(1, 4)
void WriteWindowsEventLogErrorMessage(const wchar_t* eventSourceName,
const wchar_t* messageFormat,
const char* sourceFile, int sourceLine,
...) {
// First assemble the passed message
va_list ap;
va_start(ap, sourceLine);
int bufferSize = _vscwprintf(messageFormat, ap);
++bufferSize; // Extra character for terminating null
va_end(ap);
mozilla::UniquePtr<wchar_t[]> message =
mozilla::MakeUnique<wchar_t[]>(bufferSize);
va_start(ap, sourceLine);
vswprintf(message.get(), bufferSize, messageFormat, ap);
va_end(ap);
// Next, assemble the complete error message to print
const wchar_t* errorFormat = L"Error: %s (%S:%d)";
bufferSize = _scwprintf(errorFormat, message.get(), sourceFile, sourceLine);
++bufferSize; // Extra character for terminating null
mozilla::UniquePtr<wchar_t[]> errorStr =
mozilla::MakeUnique<wchar_t[]>(bufferSize);
_snwprintf_s(errorStr.get(), bufferSize, _TRUNCATE, errorFormat,
message.get(), sourceFile, sourceLine);
WriteWindowsEventLogErrorBuffer(eventSourceName, errorStr.get(), 0);
}
} // namespace mozilla
#endif // mozilla_WindowsEventLog_h
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