File Access on Remote Computers - C# Discussion Boards

sneha016-Jun-07 23:14

6-Jun-07 23:14

I have a dropdown list box which has 4 ListItems in it . I want that when a user selects any item from dropdown list its index value should go in database table .
Suppose DropDownList has 4 values such as a, b , c , d . If user selects any of the value in dropdown list then the database should have value as 1 for a , 2 for b and so on ....

Thanks in Advance

Re: Dropdownlist

Manas Bhardwaj6-Jun-07 23:48

Manas Bhardwaj

6-Jun-07 23:48

Sneha,
You can use SelectedValue property for this.
For display puropse, you should use SelectedItem and when you are dealing with database, update it with SelectedValue.
Success!!!

Re: Dropdownlist

Manas Bhardwaj7-Jun-07 0:31

Manas Bhardwaj

7-Jun-07 0:31

Sneha,
You can use SelectedValue property for this.
For display puropse, you should use SelectedItem and when you are dealing with database, update it with SelectedValue.
Success!!!

Re: Dropdownlist

sneha017-Jun-07 1:23

sneha01

7-Jun-07 1:23

I m still not getting it can u show me hint code .

Calling a Method with the Method Name In A String

Projjal6-Jun-07 23:11

Projjal

6-Jun-07 23:11

Is it possible to evaluate a string as a method name?

Something like this:

string methodName = "Login";

invoke(methodName())

Anyone have any ideas?

- Projjal

Re: Calling a Method with the Method Name In A String

Colin Angus Mackay6-Jun-07 23:19

Colin Angus Mackay

6-Jun-07 23:19

See the documentation for the System.Reflection namespace. And also for the class Type.

Use the Type to find the MethodInfo and call Invoke on the MethodInfo object.

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Re: Calling a Method with the Method Name In A String

DavidNohejl6-Jun-07 23:20

DavidNohejl

6-Jun-07 23:20

Yes, you can do this with Reflection. For a start, http://www.google.com/search?q=methodinfo.invoke[^]

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
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File Access on Remote Computers

Mats Eurén6-Jun-07 22:50

Mats Eurén

6-Jun-07 22:50

Hi!

I'm looking for an example on how to program file access on remote computers.

I know the path (share), filename, the username and password on the remote computer, but I don't know how to program the access control.

I saw a post in another forum on the internet where someone suggested to use the NET USE command. To me, that doesn't look like the ultimate solution. I read somewhere about Generic prinipals? But there are no examples whatsoever on how to do it?!

Does anyone have any experience with that?

Regards Mats

Re: File Access on Remote Computers

Gavin Roberts7-Jun-07 0:33

Gavin Roberts

7-Jun-07 0:33

net use G: \\host\path password /user:username

http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/net_use.mspx?mfr=true

or

In an explorer window, click Tools and Map Network Drive. You can then put in the details there.

Re: File Access on Remote Computers

Mats Eurén7-Jun-07 1:23

Mats Eurén

7-Jun-07 1:23

I think that this is not the way to do it.

I need code examples (C#) on how to access files on a remote computer. Not just to map a network drive. There must be another "cleaner" method to do this. Or am I completely wrong here?

.Count, not in namespace system.

jblouir6-Jun-07 22:35

jblouir

6-Jun-07 22:35

In a previous post I was informed that I could count the number of elements in an array using.

// elements is a previously declared array

elements.Count

however .Count isnt available

I looked it up in the object viewer and it looks like its a part of the system namespace which I have included in my code.

Anyone know why it might not be showing up?

and also if

elements.Count

and

elements.Length

return the same value?

Re: .Count, not in namespace system.

Brady Kelly6-Jun-07 23:08

Brady Kelly

6-Jun-07 23:08

How can a property be part of the System namespace? Elements.Count won't ever return anything, so do yourself a favour and use the property that does exist, elements.Length

Re: .Count, not in namespace system.

jblouir7-Jun-07 1:22

jblouir

7-Jun-07 1:22

Forgive me if I am wrong but dont all the different classes such as array and int etc come from namespaces? Then .Count is derived from array which is part of system, ok so its a property, but if you dont have proper namespace it wont be there.

Re: .Count, not in namespace system.

Brady Kelly7-Jun-07 3:01

Brady Kelly

7-Jun-07 3:01

Count is a property, it isn't found in a namespace but on a class, and the class will be found in a namespace.

Re: .Count, not in namespace system.

Colin Angus Mackay6-Jun-07 23:09

Colin Angus Mackay

6-Jun-07 23:09

It is an array then use Length. If it any other type of collection then use Count.

Re: .Count, not in namespace system.

DavidNohejl6-Jun-07 23:15

DavidNohejl

6-Jun-07 23:15

Colin Angus Mackay wrote:
It is an array then use Length. If it any other type of collection then use Count

Kinda sucks there is this "inconsistency". Yes, sure, logicaly array has lenght not count and collection doesn't have lenght but count, but... What about NumberOfElements or something for both.

Re: .Count, not in namespace system.

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++;

Re: .Count, not in namespace system.

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.

Re: .Count, not in namespace system.

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.

Re: .Count, not in namespace system.

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#.

Re: .Count, not in namespace system.

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]

Re: .Count, not in namespace system.

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

Sathesh Sakthivel

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/

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