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设置数据库中的系统变量值
[helpstring("method SetVariable")]
HRESULT SetVariable([in] BSTR pszName, [in] IMxDrawResbuf* value);例如: C#写捕操变量
       MxDrawDatabase database = (MxDrawDatabase)axMxDrawX1.GetDatabase();
     MxDrawResbuf  val = new MxDrawResbuf();
     RTSHORT:5003,RTREAL:5001,RTSTR:5005
     val.AddLongEx(0,5003);
     database.SetVariable("OSMODE", val);