Re: CRC Modbus - C# Discussion Boards

jblouir6-Jun-07 23:23

jblouir

6-Jun-07 23:23

Well I was unstructed to use this...

string [] elements = line.split(new char [] { ',' } );

if (elements.Count > 0)
{
int n;

elements is an array, when .Count didnt work I assumed it was because I missing a using namespace

.Length appears to work but im still stuck with trying to add an object to a global object array.

intIndex, strRoom,strDesc,strLook, i are all variables, descriptor being the object name

RoomData descriptor = new RoomData(intIndex, strRoom, strDesc, strLook);
GlobalVars.arrRoomData.SetValue(descriptor,i)

i++;

DavidNohejl6-Jun-07 23:27

DavidNohejl

6-Jun-07 23:27

jblouir wrote:
but im still stuck with trying to add an object to a global object array.

What is the problem? If fixed lenght of array is problem, use collection.

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Colin Angus Mackay6-Jun-07 23:28

Colin Angus Mackay

6-Jun-07 23:28

jblouir wrote:
im still stuck with trying to add an object to a global object array

You can't add objects to an array - They have a fixed length.

You may wish to try an ArrayList.

Also, global variables are rarely justified in an object oriented language. You may wish to have a rethink about your design.

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jblouir7-Jun-07 1:14

jblouir

7-Jun-07 1:14

Well I have a game loop in void Main, and I have a few methods, one being initialise which sits in the loop that repeats until input = exit.

the loop needs the input variable

and initialise needs the input variable

they need to be the same, and the best way I found of doing that is using a global variable.

I have been literally programming in C# for less than a week, I am doing things that work and learning as I go, if there is a better way to do it then I implement the new method.

I had thought that I could make a method that would return input but couldnt work it out at the time.

// Edit

And yes, the internet is my only resource at the moment, when I get the money to spend ill buy a book on C#.

Luc Pattyn6-Jun-07 23:39

Luc Pattyn

6-Jun-07 23:39

Hi,

some remarks on your code:

jblouir wrote:
string [] elements = line.split(new char [] { ',' } );

can be simplified to
string [] elements = line.Split(',');
because of the params keyword in one of the Split overloads

jblouir wrote:
if (elements.Count > 0)

I see no way elements.Count could be zero; if no comma's are present, everything
will be returned as the first and only string in elements[].

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

Christian Graus6-Jun-07 23:54

Christian Graus

6-Jun-07 23:54

Luc Pattyn wrote:
string [] elements = line.Split(',');

He's trying to use code that I wrote off the cuff in an earlier answer. I have found that the above doesn't work for me, I must be doing something wrong.

Luc Pattyn wrote:
I see no way elements.Count could be zero;

Good point, I was trying to illustrate the need to code defensively, and not assume an array length, but in this case, you're right.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

CRC Modbus

pmartike6-Jun-07 22:11

pmartike

6-Jun-07 22:11

Can anybody help me to make a working CRC Modbus calculation application??

Confused | :confused:

http://pmartike.deviantart.com/

Re: CRC Modbus

Sathesh Sakthivel6-Jun-07 22:14

Launching C# app through local network

6-Jun-07 22:14

The Article by Marcel de Wijs CRC Encoding[^] here in CP will Help You.

Regards,

Satips. Rose | [Rose]

Re: CRC Modbus

pmartike6-Jun-07 23:15

pmartike

6-Jun-07 23:15

ok, but that code not working....

i found a working code, here is:

static ushort[] CRCTable ={<br />
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,<br />
0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,<br />
0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,<br />
0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,<br />
0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,<br />
0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,<br />
0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,<br />
0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,<br />
0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,<br />
0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,<br />
0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,<br />
0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,<br />
0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,<br />
0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,<br />
0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,<br />
0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,<br />
0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,<br />
0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,<br />
0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,<br />
0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,<br />
0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,<br />
0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,<br />
0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,<br />
0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,<br />
0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,<br />
0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,<br />
0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,<br />
0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,<br />
0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,<br />
0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,<br />
0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,<br />
0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040<br />
            };<br />
<br />
ushort ModbusCRC16(byte [] s)<br />
{<br />
  byte b;<br />
  int i;<br />
  ushort result = 0xFFFF;<br />
  for (i=0;i<s.Length;i++)<br />
  {<br />
    b = (byte)(s[i] ^ result);<br />
    result = (ushort)(result >> 8 ^ CRCTable[b]);<br />
  }<br />
  return (result);<br />
}

Bye!

http://pmartike.deviantart.com/

sgeorgije6-Jun-07 21:31

sgeorgije

6-Jun-07 21:31

Is it possible to launch C# app through local network from another PC where is installed .NET Framework, if .NET Framework is not installed on our PC?

Re: Launching C# app through local network

Sathesh Sakthivel6-Jun-07 22:12

Re: Launching C# app through local network

6-Jun-07 22:12

Yes.

For Details Here[^]

Regards,

Satips. Rose | [Rose]

mav.northwind6-Jun-07 23:14

mav.northwind

6-Jun-07 23:14

Sorry, that's not what the original question was about.
He wants to run .NET apps on a computer without .NET.

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: Launching C# app through local network

mav.northwind6-Jun-07 23:13

mav.northwind

6-Jun-07 23:13

No it isn't.
Wherever a .NET application is to be run you've got to have the .NET Framework installed. Period.

Regards,
mav

--
Black holes are the places where God divided by 0...

How to bind dynamically table column from database to dorpdownlist of Radgrid

Lopamudra Panda6-Jun-07 21:10

Lopamudra Panda

6-Jun-07 21:10

Hi,
Right now i m working on a project this a requirement for my project...
i donot know to how to do this....

The sky is on limit for me.

Re: How to bind dynamically table column from database to dorpdownlist of Radgrid

Sathesh Sakthivel6-Jun-07 21:14

6-Jun-07 21:14

One post is enough in BTW why are you creating the new thread for the same.

Regards,

Satips. Rose | [Rose]

Oledb PArameters

Tauseef A6-Jun-07 20:51

Tauseef A

6-Jun-07 20:51

actually i m new to dot net

i m using oledb connection

and my query is

"select * from tableabc where name = ? and id = ?"

i dont know how to map these parameters to my command object can any body tell me please

thanks

hello

hello

Sathesh Sakthivel6-Jun-07 20:56

6-Jun-07 20:56

Why are you creating the new thread for the same question.

pls correct it in the prevoius post itself.

Regards,

Satips. Rose | [Rose]

Pankaj - Joshi6-Jun-07 21:09

Pankaj - Joshi

6-Jun-07 21:09

System.Data.OleDb.OleDbCommand cmd = new System.Data.OleDb.OleDbCommand();
cmd.Parameters.AddWithValue("@id", 1);
cmd.CommandText = "Select * from Emp Where EmpId=@id";

Regards
Pankaj Joshi

Tauseef A6-Jun-07 21:12

Tauseef A

6-Jun-07 21:12

but i am using dot net frame work 1.1 and there is not add with value

hello

blackjack21506-Jun-07 21:19

blackjack2150

6-Jun-07 21:19

Use this pattern:

OleDbParameter param = new OleDbParameter();<br />
            param.DbType = DbType.Int32;<br />
            param.Value = 15;<br />
<br />
            command.Parameters.Add(param);

blackjack21506-Jun-07 21:16

blackjack2150

6-Jun-07 21:16

Those are MySql named parameters.
He uses Access I think.

Tauseef A6-Jun-07 21:26

Tauseef A

6-Jun-07 21:26

private const string ConString ="Provider=MSDAORA;Data Source=ESPCS;User ID=espcs_users;Password=jtechusers;Persist Security Info=True";
private const string GetEmployeeByName= "select empno,name,grade,desgn,section from espcs.emp where status='T' and " +
" empno = @empno";

when i run this code it gives an exception "some error occured during processing of command"
public DataSet GetEmpByName(int name)
{

try
{
using (OleDbConnection con = new OleDbConnection (ConString))
{
con.Open ();
OleDbCommand com = new OleDbCommand (GetEmployeeByName ,con);

OleDbParameter par = new OleDbParameter ();
par.DbType = System .Data.DbType.Int32;
par.Value = name;

com.Parameters.Add(par);
OleDbDataAdapter dr = new OleDbDataAdapter (com);
DataSet ds = new DataSet ();
dr.Fill (ds);

return ds;

hello

Pankaj - Joshi6-Jun-07 21:41

Pankaj - Joshi

6-Jun-07 21:41

Hi,
I don't why it giving error but I use same code as you use except I use the MSACCESS
as database and it is running successfully

public DataSet GetEmpByName(int empId)
{
string ConString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\test.mdb";
string GetEmployeeByName = "select * from Emp where Empid = @empno";
DataSet ds = new DataSet();
try
{
OleDbConnection con = new OleDbConnection(ConString);
con.Open();
OleDbCommand com = new OleDbCommand(GetEmployeeByName, con);

OleDbParameter par = new OleDbParameter();
par.DbType = System.Data.DbType.Int32;
par.Value = empId;

com.Parameters.Add(par);
OleDbDataAdapter dr = new OleDbDataAdapter(com);

dr.Fill(ds);

}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
return ds;
}
Rose | [Rose]

Regards
Pankaj Joshi

Pankaj - Joshi6-Jun-07 21:43

Pankaj - Joshi

6-Jun-07 21:43

You Can also add the parameter name to like

par.ParameterName = "@empno"; Big Grin | :-D

Regards
Pankaj Joshi