我碰到两个麻烦：
1.先建个Console Application,定义了数据结构后
        public struct MSGBOXPARAMS
        {
            public uint cbSize;
            public IntPtr hwndOwner;
            public IntPtr hInstance;
            public string lpszText;
            public string lpszCaption;
            public uint dwStyle;
            public string lpszIcon;
            public int dwContextHelpId;
            public string  lpfnMsgBoxCallback;
            public uint dwLanguageId;
        };
MSGBOXPARAMS MsgBp = new MSGBOXPARAMS();
MsgBp.cbSize = (uint)sizeof(MSGBOXPARAMS);//因为没赋初值所以sizeof出错,其他语言怎么就行了．若有初值这个后也可能改变初值啊！
2.MsgBp.lpszIcon//指像Icon资源的指针,这个指针是string类型,我还是不会玩．