用OC如何像QQ一样发送离线消息呢？今天学习了一整天，有一点结果。最简单的方法是用OC Auamation API. 下述是伪代码，只用来表示如果使用automation API实现。

//在调用前，oc客户端要被运行起来，可能没有登录

CommunicatorAPI.MessengerClass communicatorObj = new CommunicatorAPI.MessengerClass();

if (communicatorObj.MyStatus != MISTATUS.MISTATUS_OFFLINE)

 {                     //If already signed in, then set connected status to true and return.                    connected = true;       // Set the connected status to true.}else{    try     {             //communicatorObj.Signin();            communicatorObj.AutoSignin(); //如果自动登录，用gpedit可以设定    }    catch { }}

    //方法一：

                //load selected contacts into ArrayList.

                ArrayList contactArray =  new ArrayList() ;                contactArray.Add(a.com);                contactArray.Add(a.com);

                //dimension object array to the number of contacts selected

                object[] sipUris = new object[contactArray.Count];                int currentObject = 0;

                //iterate over contactArray and load each individual

                //contact into object array element.                foreach (object contactObject in contactArray)                {                     sipUris[currentObject] = contactObject;                    currentObject ++;                }

                //communicatorObj.OnIMWindowCreated += new DMessengerEvents_OnIMWindowCreatedEventHandler(communicatorObj_OnIMWindowCreated);

                CommunicatorAPI.IMessengerAdvanced msgrAdv = communicatorObj as CommunicatorAPI.IMessengerAdvanced;                object obj = msgrAdv .StartConversation(CONVERSATION_TYPE.CONVERSATION_TYPE_IM,sipUris,null,"Notify","1",null) ;                long imWindowHandle = long.Parse(obj.ToString());                if (null != imWindowHandle)                {                     IMessengerConversationWndAdvanced IM_Window2 = obj as IMessengerConversationWndAdvanced;                    IM_Window2.SendText("hi");                    IM_Window2.Show();                }

            //方法二

string sipuri = "a.com";

                IMessengerContactAdvanced contact = FindContact(sipuri);

                if (contact.Status == MISTATUS.MISTATUS_OFFLINE)                {                     return;                }                IMessengerConversationWndAdvanced IM_Window = communicatorObj.InstantMessage((object)sipuri) as IMessengerConversationWndAdvanced;                if (IM_Window != null)                {                     IM_Window.SendText("hello");                    IM_Window.Show();                }