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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
// Package eventlog implements access to Windows event log.
//
package eventlog
import (
"errors"
"syscall"
"golang.org/x/sys/windows"
)
// Log provides access to the system log.
type Log struct {
Handle windows.Handle
}
// Open retrieves a handle to the specified event log.
func Open(source string) (*Log, error) {
return OpenRemote("", source)
}
// OpenRemote does the same as Open, but on different computer host.
func OpenRemote(host, source string) (*Log, error) {
if source == "" {
return nil, errors.New("Specify event log source")
}
var s *uint16
if host != "" {
s = syscall.StringToUTF16Ptr(host)
}
h, err := windows.RegisterEventSource(s, syscall.StringToUTF16Ptr(source))
if err != nil {
return nil, err
}
return &Log{Handle: h}, nil
}
// Close closes event log l.
func (l *Log) Close() error {
return windows.DeregisterEventSource(l.Handle)
}
func (l *Log) report(etype uint16, eid uint32, msg string) error {
ss := []*uint16{syscall.StringToUTF16Ptr(msg)}
return windows.ReportEvent(l.Handle, etype, 0, eid, 0, 1, 0, &ss[0], nil)
}
// Info writes an information event msg with event id eid to the end of event log l.
// When EventCreate.exe is used, eid must be between 1 and 1000.
func (l *Log) Info(eid uint32, msg string) error {
return l.report(windows.EVENTLOG_INFORMATION_TYPE, eid, msg)
}
// Warning writes an warning event msg with event id eid to the end of event log l.
// When EventCreate.exe is used, eid must be between 1 and 1000.
func (l *Log) Warning(eid uint32, msg string) error {
return l.report(windows.EVENTLOG_WARNING_TYPE, eid, msg)
}
// Error writes an error event msg with event id eid to the end of event log l.
// When EventCreate.exe is used, eid must be between 1 and 1000.
func (l *Log) Error(eid uint32, msg string) error {
return l.report(windows.EVENTLOG_ERROR_TYPE, eid, msg)
}
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