在C#中,是否可以访问并更改windows消息泵以响应WM#u GETOBJECT?

因此,有一种很好的技术可以从一台机器上获取COM指针交叉进程(同一台机器)Excel.exe会话,如果您知道它的Hwnd使用可访问性API。特定的Windows API函数是 AccessibleObjectFromWindow ;如果使用OBJID_NATIVEOM参数调用,则Excel.exe封送回指向Excel.窗口对象。很酷。

The answer is yes, they respond to a certain message, WM_GETOBJECT, in their message pump code. 对于C++应用程序来说,这是可行的,但我对如何为C语言应用程序感到困惑。

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);


    [DllImport("oleacc.dll", SetLastError = true)]
    internal static extern int AccessibleObjectFromWindow(IntPtr hwnd, uint id, ref Guid iid,
                                                [In, Out, MarshalAs(UnmanagedType.IUnknown)] ref object ppvObject);

    bool IXlMoniker.GetExcelByHwnd(int lhwndApp2, ref object appRetVal)
    {
        bool bRetVal = false;

        IntPtr lhwndApp = (IntPtr)lhwndApp2;

        IntPtr lHwndDesk = FindWindowEx(lhwndApp, IntPtr.Zero, "XLDESK", "");
        if (lHwndDesk != IntPtr.Zero)
        {

            IntPtr lHwndExcel7 = FindWindowEx(lHwndDesk, IntPtr.Zero, "EXCEL7", null);
            if (lHwndExcel7 != IntPtr.Zero)
            {
                Guid IID_IDispatch = new Guid("{00020400-0000-0000-C000-000000000046}");
                const uint OBJID_NATIVEOM = 0xFFFFFFF0;
                object app = null;
                if (AccessibleObjectFromWindow(lHwndExcel7, OBJID_NATIVEOM, ref IID_IDispatch, ref app) == 0)
                {
                    dynamic appWindow = app;
                    appRetVal = appWindow.Application;
                    return true;
                }
            }
        }
        return bRetVal;
    }

这看起来很有希望 Return an IOleCommandTarget from processing WM_GETOBJECT in a NativeWindow