//读参数结构体初始化函数
public static void R_Struct_Inital(ref S7_READ_PARA R_Struct, String Mvar_name)
{
R_Struct.access = S7_ACCESS_SYMB_ADDRESS;
R_Struct.var_name = Mvar_name;
R_Struct.index = 0;
R_Struct.subindex = 0;
R_Struct.address_len = 0;
R_Struct.address = null;
}
/// <summary>
/// 接收数据,如果返回nomesssge 则不会对value_ptr进行修改
/// </summary>
/// <param name="cp_descr"></param>
/// <param name="cref"></param>
/// <param name="orderid"></param>
/// <param name="read_para"></param>
/// <param name="value_ptr"></param>
/// <returns></returns>
public static int Receive(UInt32 cp_descr, UInt16 cref, UInt16 orderid, ref S7_READ_PARA read_para, Byte[] value_ptr)
{
int ret;
UInt16 value_length = (UInt16)value_ptr.Length;
IntPtr NULL_PTR = new IntPtr();
UInt16 result = 0;
ret = s7_receive(cp_descr, ref cref, ref orderid);
switch (ret)
{
case S7_NO_MSG:
break;
case S7_INITIATE_CNF:
s7_get_initiate_cnf();
break;
case S7_READ_CNF:
s7_get_read_cnf(NULL_PTR, ref value_length, value_ptr);
// S7_read_req(cp_descr, cref, orderid, ref read_para);
break;
case S7_WRITE_CNF:
s7_get_write_cnf();
break;
case S7_MULTIPLE_READ_CNF:
break;
case S7_MULTIPLE_WRITE_CNF:
s7_get_multiple_write_cnf(ref result);
break;
case S7_ABORT_IND:
s7_get_abort_ind();
break;
default:
break;
}
return(ret);
}
public static extern int s7_read_req(UInt32 cp_descr, UInt16 cref, UInt16 orderid, ref S7_READ_PARA read_para);
