C#调用c++Dll指针数组,该如何解决

C#调用c++Dll指针数组
c代码

C/C++ code

  int  _stdcallrd6sn_gethisdata_withinsert(u_int32_t pt, int starttime,int endtime,float *value,int type);

怎么写成C#的代码，返回float数组。
我写的如下：

C# code

 [DllImport(dll_name, EntryPoint = "rd6sn_gethisdata_withinsert")]        public static extern int rd6sn_gethisdata_withinsert(UInt32 pt, int starttime, int endtime, ref  float[] value, int type);DateTime dtend = DateTime.Parse("2012-5-7 10:30:00");            DateTime dtBegin = DateTime.Parse("2012-5-7 10:10:00");            DateTime DataTime1970 = DateTime.Parse("1970-1-1");            int begitime = (int)(dtBegin - DataTime1970).TotalMilliseconds;            int begiendtime = (int)(dtend - DataTime1970).TotalMilliseconds;            long[] vlueflqqq = new long[1];            float[] vluefl = new float[1]; DataPeek.DPG.DPGClass.rd6sn_gethisdata_withinsert(8024, begitime, begiendtime, ref vluefl, 3);

运行出现“指针表尝试读取或写入受保护的内存。这通常指示其他内存已损坏”的错误，请问应该怎么写

[解决办法]
public static extern int rd6sn_gethisdata_withinsert(UInt32 pt, uint starttime, uint endtime, ref float[] value, int type); startime 和endtime改成无符号整形

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