API-based directuihwnd form access in. net

Start with the question:
　　
1. Add reference. Project-> Add reference-> C:/progmme ~ 1/MSN Messenger/msnmsgr.exe
　　
2. Using messengerapi;
　　
Statement:
　　
Private messengerapi. messengerclass MSN;
Private messengerapi. imessential gerconversationwnd msnmsgwnd;
　　
3. Add in init:
　　
MSN = new messengerclass ();
MSN. onimwindowcreated + = new dmessengerevents_onimwindowcreatedeventhandler (msn_onimwindowcreated );
MSN. onimwindowdestroyed + = new dmessengerevents_onimwindowdestroyedeventhandler (msn_onimwindowdestroyed );
　　
4.
　　
Private void msn_onimwindowcreated (Object pimwindow)
{
Msnmsgwnd = (imessential gerconversationwnd) pimwindow; // get the IM window handle
　　
# Region get IM message
System. intptr ptruihwnd = nativewin32.find1_wex (msnmsgwnd. hwnd, 0, "directuihwnd", 0); // obtain the directuihwnd handle in the window
Guid guidcom = new GUID (0x618736e0, 0x3c3d, 0x11cf, 0x81, 0xc, 0x0, 0xaa, 0x0 0x38, 0x9b, 0x71 ); // The GUID of COM
Iaccessible iacurrent = NULL; // iaccessible set
Try
{
　　
Nativewin32.accessibleobjectfromwindow (ptruihwnd, (INT) nativemsg. objid_client, ref guidcom, ref iacurrent); // obtain the iaccessible set in ptruihwnd
　　
Iacurrent = (iaccessible) iacurrent. accparent; // its parent is the real container of the iaccessible set.
Int _ childcount = iacurrent. accchildcount;
Object [] _ Children = new object [_ childcount];
Int _ out;
Nativewin32.accessiblechildren (iacurrent, 0, _ ChildCount-1, _ children, out _ out); // from iacurrent, add all sub-iaccessible to the _ Children Array
Foreach (iaccessible _ child in _ children)
{
String _ accname = _ child. get_accname (INT) nativemsg. childid_self );
　　
}
　　
}
Catch (exception ex)
{
Throw ex;
}
# Endregion
}
　　
Private void msn_onimwindowdestroyed (Object pimwindow)
{
Msnmsgwnd = NULL;
}
　　
5. Method for directly searching the message form
　　
Private void findimwindow ()
　　
{System. intptr hwndstart;
Int _ next = 0;
Do
{
Hwndstart = nativewin32.find1_wex (0, _ next, "imwindowclass", 0 );
_ Next = hwndstart. toint32 ();
} While (_ next! = 0 );
　　
}
　　
6. Finally, the API Declaration
　　
# Region API wrapper
Public class nativewin32
{
[Dllimport ("user32.dll", charset = charset. Auto)]
Public static extern intptr find1_wex (
Int parent/* hwnd */,
Int next/* hwnd */,
String lpszclass,
String swindowtitle );
　　
[Dllimport ("oleacc. dll")]
Public static extern int accessibleobjectfromwindow (
Intptr hwnd,
Int dwobjectid,
Guid refID,
Ref iaccessible ppvobject );
　　
[Dllimport ("oleacc. dll")]
Public static extern int accessiblechildren (
Accessibility. iaccessible pacccontainer,
Int ichildstart,
Int cChildren,
[Out] object [] rgvarchil.pdf,
Out int pcobtained );
　　
}
Public Enum nativemsg: long {
Childid_self = 0,
Childid_1 = 1,
Objid_client = 0 xffffffc
}
# Endregion