C# Win32API类

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class Win32API
        {
            [DllImport("User32.dll")] //User32.dll是Windows操作系统的核心动态库之一
            public static extern int FindWindow(string lpClassName, string lpWindowName);

            [DllImport("user32", EntryPoint = "RegisterWindowMessage")]
            public static extern int RegisterWindowMessage(
                    string lpString
            );

            [DllImport("user32", EntryPoint = "SendMessage")]
            public static extern int SendMessage(
                    int hwnd,
                    int wMsg,
                    int wParam,
                    ref int lParam
            );

            [DllImport("OLEACC.DLL", EntryPoint = "ObjectFromLresult")]
            public static extern int ObjectFromLresult(
            int lResult,
            ref System.Guid riid,
            int wParam,
            [System.Runtime.InteropServices.MarshalAs(UnmanagedType.Interface), System.Runtime.InteropServices.In, System.Runtime.InteropServices.Out]ref System.Object ppvObject
                //注意这个函数ObjectFromLresult的声明.
            );
        }