session_notifications

Documentation

Overview

Receive session change notifications from Windows.

Example

package main

import (
	"github.com/gorpher/gowin32/session_notifications"
	"log"
)

func main() {
	quit := make(chan int)

	chanMessages := make(chan session_notifications.Message, 100)
	chanClose := make(chan int)

	go func() {
		for {
			select {
			case m := <-chanMessages:
				switch m.UMsg {
				case session_notifications.WM_WTSSESSION_CHANGE:
					switch m.Param {
					case session_notifications.WTS_SESSION_LOCK:
						log.Println("session locked")
					case session_notifications.WTS_SESSION_UNLOCK:
						log.Println("session unlocked")
					}
				case session_notifications.WM_QUERYENDSESSION:
					log.Println("log off or shutdown")
				}
				close(m.ChanOk)
			}
		}
	}()

	session_notifications.Subscribe(chanMessages, chanClose)

	// ctrl+c to quit
	<-quit
}

Index

• Constants
• Variables
• func Subscribe(subchanMessages chan Message, ctx context.Context)
• type Message

Constants

const (
	WTS_CONSOLE_CONNECT        = 0x1
	WTS_CONSOLE_DISCONNECT     = 0x2
	WTS_REMOTE_CONNECT         = 0x3
	WTS_REMOTE_DISCONNECT      = 0x4
	WTS_SESSION_LOGON          = 0x5
	WTS_SESSION_LOGOFF         = 0x6
	WTS_SESSION_LOCK           = 0x7
	WTS_SESSION_UNLOCK         = 0x8
	WTS_SESSION_REMOTE_CONTROL = 0x9
	WTS_SESSION_CREATE         = 0xA
	WTS_SESSION_TERMINATE      = 0xB

	WM_QUERYENDSESSION   = 0x11
	WM_WTSSESSION_CHANGE = 0x2B1

	ENDSESSION_CLOSEAPP = 0x00000001
	ENDSESSION_CRITICAL = 0x40000000
	ENDSESSION_LOGOFF   = 0x80000000
)

http://msdn.microsoft.com/en-us/library/aa383828(v=vs.85).aspx

Variables

var (
	CloseHandle = kernel32.MustFindProc("CloseHandle")
)

Functions

func Subscribe

func Subscribe(subchanMessages chan Message, ctx context.Context)

Subscribe will make it so that subChan will receive the session events. chanSessionEnd will receive a '1' when the session ends (when Windows shut down) To unsubscribe, close closeChan You must close 'ChanOk' after processing the event. This channel is to give you time to save if the event is WM_QUERYENDSESSION

Types

type Message

type Message struct {
	UMsg   int
	WParam int
	LParam int
	ChanOk chan int
}