这些方法需要什么参数？
Client.ReadArea(S7.S7AreaDB,1,1,1,byte[]{2});
S7.GetDIntAt(byte,1);
每种方法的数量包含哪些值？
AreaType area: one of area type like DB (data block), MK (Merker) and ...
int db: `IF` area type is DB, it will the show db number
int start: show the position of start of bits
int amount: number of bits
DataType type: type of Data like BIT, BYTE, WORD, REAL and ....
byte[] buffer: result will be copy to this array
client.readArea(AreaType.DB， 200， 34， 1， DataType.BYTE， buffer(;