public short Calc_ChecksumOfAckPacketObj(AckClass PktObj)
{
short checksum = 0;
foreach (byte chData in PktObj.DeviceId)
{
checksum += chData;
}
foreach (byte chData in PktObj.Password)
{
checksum += chData;
}
foreach (byte chData in PktObj.TypeId)
{
checksum += chData;
}
foreach (byte chData in PktObj.Packet_sno)
{
checksum += chData;
}
foreach (byte chData in PktObj.Continue_Sts)
{
checksum += chData;
}
foreach (byte chData in PktObj.Data)
{
checksum += chData;
}
/* Condition should be added if and only if checksum is greater than 65535(2bytes).*/
// checksum &= 0xff;
return(checksum);
}
private byte[] ObjectToByteArray(AckClass obj)
{
try
{
/* Need to place the bytes[] into Object */
/* Get the data bytes length */
int array_len = 0;
array_len = Global.Packet_overhead_len; // Asumming Packet has no data.
int data_bytes_len = obj.Data.Length; // Packet_overhead_len is Fixed for all packets but data changes.
if (data_bytes_len > 0) /* Packet has Some Databyte need to change the length */
{
array_len = array_len + data_bytes_len;
}
/* Creating new Array */
byte[] Ack_bytes = new byte[array_len];
int Packet_Checksum_StartIdx = Global.Packet_data_start_Idx + data_bytes_len;
/* Frame Packet Object from byte[] data */
Array.Copy(obj.packetHeader, 0, Ack_bytes, Global.Packet_Header_start_Idx, Global.Packet_Header_len); // Copy PacketHeader
Array.Copy(obj.Packet_Length, 0, Ack_bytes, Global.PacketLength_start_Idx, Global.PacketLength_len); // Copy Length of Packet
Array.Copy(obj.DeviceId, 0, Ack_bytes, Global.Packet_DeviceID_start_Idx, Global.Packet_DeviceID_len); // Copy Device Id of Packet
Array.Copy(obj.Password, 0, Ack_bytes, Global.Packet_Password_start_Idx, Global.Packet_Password_len); // Copy System Password of Packet
Array.Copy(obj.TypeId, 0, Ack_bytes, Global.Packet_TypeId_start_Idx, Global.Packet_TypeId_len); // Copy TYpeID of Packet
Array.Copy(obj.Packet_sno, 0, Ack_bytes, Global.Packet_Sno_start_Idx, Global.Packet_Sno_len); // Copy Packet SNo of Packet
Array.Copy(obj.Continue_Sts, 0, Ack_bytes, Global.Packet_ContinueSts_start_Idx, Global.Packet_ContinueSts_len); // Copy Continue_Sts of th Packet
Array.Copy(obj.Data, 0, Ack_bytes, Global.Packet_data_start_Idx, data_bytes_len); // Copy Data of Packet
Array.Copy(obj.Checksum, 0, Ack_bytes, Packet_Checksum_StartIdx, Global.Packet_Chcksum_len); // Copy Checksum of Packet
return(Ack_bytes); // Returning Ack bytes
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Occured in ObjectToByteArray: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
private byte[] FrameCommunicationAck(PacketClass PacketObj)
{
try
{
AckClass AckPacket = new AckClass();
AckPacket.packetHeader = Global.CommInitResponse_pkt_header;
// Length ?? 18
// AckPacket.Packet_Length = PacketObj.Packet_Length; { Should not do like this beacuse it is going to change Original object }
PacketObj.Packet_Length.CopyTo(AckPacket.Packet_Length, 0);
PacketObj.DeviceId.CopyTo(AckPacket.DeviceId, 0);
PacketObj.Password.CopyTo(AckPacket.Password, 0);
Global.CommInitAckPkt_TypeID.CopyTo(AckPacket.TypeId, 0);
Global.CommInitAckPkt_SNo.CopyTo(AckPacket.Packet_sno, 0);
Global.CommInitAckContinue_Sts.CopyTo(AckPacket.Continue_Sts, 0);
AckPacket.Data = new byte[] { }; // Empty Data Feild
short checksum = Calc_ChecksumOfAckPacketObj(AckPacket);
AckPacket.Checksum = BitConverter.GetBytes(checksum); // Getting Bytes from checksum..
AckPacket = Reverse_AckPacketBytes(AckPacket); // Reversing the AckPacket Object Is Causing the Device Id in Reverse
byte[] Final_bytes = ObjectToByteArray(AckPacket); // Serializing Object to Byte Array.
return(Final_bytes); // Returning Serialozed Byte array.
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Ocuured While FrameCommunicationAck: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
public AckClass Reverse_AckPacketBytes(AckClass Ack_obj)
{
try
{
Array.Reverse(Ack_obj.packetHeader); // Reversing the Packet Header Bytes
Array.Reverse(Ack_obj.Packet_Length);
Array.Reverse(Ack_obj.DeviceId);
Array.Reverse(Ack_obj.Password);
Array.Reverse(Ack_obj.TypeId);
Array.Reverse(Ack_obj.Packet_sno);
Array.Reverse(Ack_obj.Continue_Sts);
Array.Reverse(Ack_obj.Checksum);
return(Ack_obj);
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Occured in Reverse_PacketBytes: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
