when i receive a message what an event will spring in MessengerAPI ?
Thanks~

There are no such events.

To vikke:
yes I see ,but the "Function ReceiveNotify" in the example for  "Messenger Plus! Plugin API for VB.NET" is true

who can tell me how to use this Function~?Thanks
Code:
    '//////////////////////////////////////////////////////////////////////
    '//                                                                  //
    '// Purpose: Allow special actions when a plugin text is received    //
    '//                                                                  //
    '// Definition:                                                      //
    '//   This function is called everytime Messenger Plus! detects a    //
    '//   plugin text ID in a message received from a user. This ID is   //
    '//   generally placed at the beginning of a text by a plugin        //
    '//   command to perform an action on the destination computers.     //
    '//   This can be used, for example, to play a sound. See the        //
    '//   control characters section for more information.               //
    '//                                                                  //
    '// Parameters:                                                      //
    '//   * sNotifyCode: this 5 character string is the notify code that //
    '//     was sent next to the plugin ID control character. Use it to  //
    '//     identify what action to perform.                             //
    '//   * sText: the rest of the received message. You can use it to   //
    '//     get more information about the action you want to perform.   //
    '//     However, you MUST NOT use this parameter to determine if an  //
    '//     action is supported by your plugin. Use sNotifyCode instead. //
    '//   * sContactName: friendly name of the contact who sent this     //
    '//     text.                                                        //
    '//   * oConversationWnd: Messenger Conversation Window COM          //
    '//     interface. The type of this object is                        //
    '//     "MessengerConversationWnd". For more information, consult    //
    '//     the public Messenger API documentation on Microsoft's web    //
    '//     site.                                                        //
    '//   * sTextToSend: this parameter is optional. You can use it if   //
    '//     you want to ask Messenger Plus! to send a new message after  //
    '//     this one has been displayed. This WON'T modify the message   //
    '//     associated with the notify code, this will simply send a new //
    '//     one.                                                         //
    '//   * return value: if you recognized the notify code return True, //
    '//     else, return False.                                          //
    '//                                                                  //
    '// Advanced: if the plugin version returned by Initialize() is 2 or //
    '// above, you can specify more than one message or command in       //
    '// sTextToSend. Simply create new lines with # as first character   //
    '// (use vbLf to create new lines in your string). Up to 20 actions  //
    '// can be specified, each being executed at a 0.5 second interval.  //
    '// A different delay can even be entered for each action. After the //
    '// first #, just put a digit between 1 and 9 and another #.         //
    '//   Example: sTextToSend = "#First message\n#5#Second message"     //
    '//                                                                  //
    '// Important: keep in mind that several plugins can be installed    //
    '// and that a lot of text is received. If you don't support the     //
    '// notify code passed in parameter, you must return as fast as      //
    '// possible and without doing anything else.                        //
    '//                                                                  //
    '//////////////////////////////////////////////////////////////////////
    Public Function ReceiveNotify(ByVal sNotifyCode As String, ByVal sText As String, ByVal sContactName As String, ByVal oConversationWnd As Object, ByRef sTextToSend As String) As Boolean
    End Function

The RecieveNotify function provided by the Messenger Plus! API doesn't capture messages send/recieved. This function is used to allow two of the same plugins (one on each computer) to react a specific way to a command send that requires the contact to respond. Take the /ping command for example. You can do this using RecieveNotify. Messenger Plus! will see the character to specificy its for RecieveNotify then it will check against 5 specific characters to verify the plugin is supposed to respond.

If you wait for Messenger Plus! Live it has OnEvent_ChatWndReceiveMessage which is trigered when a message is sent/recieved.

Alternatly you can use ActiveAccessibility : Matty's reply to Active Accessibility for incoming messages.

Sorry! I thought you were talking about the messenger api. MSAA is the best way.