Re: Accessing Serial Port Remotely - C# Discussion Boards

K030615-Jul-09 23:01

K0306

15-Jul-09 23:01

There is a error in insert statement

try this

cmd.CommandText = "insert into timemgmt(empid,sysdte,intime,outtime) values ('" + textBox1.Text + "','" + label19.Text + "','" + label18.Text + "','" + label18.Text + "')";

Regards,
Karthik K...

mjawadkhatri15-Jul-09 23:21

mjawadkhatri

15-Jul-09 23:21

No my problem is not solve Frown | :(

ok tell me how i search record in oracle database if record find record not save else save record

i code this for search record

cmd.CommandText = "Select empid , sysdte from timemgmt where empid = '"+textBox1.Text+"' and sysdte ='"+label19.Text+"'";

then i create condition like this

while (odr.Read())
{
if (textBox1.Text == (odr["empid"].ToString()) && label19.Text == (odr["sysdte"]).ToString())
{
MessageBox.Show("You Already IN this ID Today");
}
else
{
cmd.CommandText = "insert into timemgmt values(empid, sysdte, intime, outtime)('" + textBox1.Text + "','" + label19.Text + "','" + label18.Text + "','" + label18.Text + "')";
cmd.ExecuteNonQuery();
}

K030615-Jul-09 23:33

K0306

15-Jul-09 23:33

mjawadkhatri wrote:
cmd.CommandText = "Select empid ,sysdte from timemgmt where empid = '" + textBox1.Text + "' and sysdte ='" + label19.Text + "'";

your search query is ok.

After that use like this way,

if(odr.read())
{
 MessageBox.Show("You Already IN this ID Today");
}
else
{
 cmd.CommandText = "insert into timemgmt empid, sysdte, intime, outtime) values('" + textBox1.Text + "','" + label19.Text + "','" + label18.Text + "','" + label18.Text + "')";
cmd.ExecuteNonQuery();
}

Try the above code.Use the Breakpoints and try to rectify where the error comes.

Regards,
Karthik K...

Tom Deketelaere15-Jul-09 23:22

Tom Deketelaere

15-Jul-09 23:22

I already told you to use the 'code block' tags when posting code

(see here[^] )

I also already told you to use parameters (to prevent sql-injunctions). Not only are they safer they will also prevent a lot of errors.

Accessing Serial Port Remotely

Pete O'Hanlon15-Jul-09 23:30

Pete O'Hanlon

15-Jul-09 23:30

Where to start?

Give your variables meaningful names. At a glance, what does textBox1 do?
Your code is wide open to a SQL Injection attack. You need to look into using parameterised queries here.
Your insert statement does nothing. You create the command text and then close the connection - you need to execute the command using cmd.ExecuteNonQuery();
You have no exception handling. What happens if you can't connect the database, for instance?

If you had bothered to debug your code, you would have found the problem out in an instant. Learning to debug is one of the most valuable lessons you can master as a developer, and you should learn how to do it before too much longer.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Liya Kebede15-Jul-09 21:16

Liya Kebede

15-Jul-09 21:16

Hello Everyone,

I wrote an application which send and receive data from a pinpad(device with RS-232 which use serial port) and i start testing the application, when i finised testing the application on my computer, I upload it to the server machine to do another test but when I run the application from client computers it does not recognize the pin pad, but when I run the application from my computer it works properly. My question is that is there any way I can access the pin pad remotely?

Thanks

Garth J Lancaster16-Jul-09 0:38

Garth J Lancaster

16-Jul-09 0:38

Liya Kebede wrote:
is there any way I can access the pin pad remotely?

I dont think so : I think you need to implement a tcp/ip network layer to sit between the serial port and the network and send it commands from your application.

We do this with eftpos devices - they are sent instructions from a centralised gateway via tcp/ip, and the client on the pc interfaces to the com port (via an activex control supplied by the eftpos company) .. (ok, so there's an activex control there, but it doesnt really matter that much)

There are commercial companies out there that offer pre-made toolkits to do this - just a quick search gives :-

http://www.serial-port-communication.com/serial-over-tcpip/[^]

http://www.fabulatech.com/network-serial-port-kit.html[^]

oh .. a thought comes to mind, maybe citrix can do it, but thats a different paradigm

'g'

monstale16-Jul-09 0:52

monstale

16-Jul-09 0:52

Hi,

when you start the application on your computer, it doesn't matter where the exe-file is located, the code runs on your computer with it's local hardware!
When you need to communicate with a remote serial port, you need to run on the remote computer an application, e.g. windows service, and communication with that application (e.g. Sockets)

Kind regards

Liya Kebede16-Jul-09 2:07

Liya Kebede

16-Jul-09 2:07

Hi,

Does it help if i use socket programming?

Thanks Again

monstale16-Jul-09 2:36

monstale

16-Jul-09 2:36

Hi,

I don't think so. A normal com port is not reachable from remote without any local program.
But you can write a simple program which sends every received byte to com port. backwards might be a bit difficultier, because you should use DataReceived event from com port on server. but what is life without any chalenge? Smile | :)

good luck, bye

Liya Kebede2-Nov-09 0:47

Liya Kebede

2-Nov-09 0:47

Hi guys,

I was able to access the serial port remotely but when i change the serial port to usb it does not working. Is there any way i can access the pinpad using usb ports or is there a library which work like serial port in C#.

Thanks Again

Liya

Own Report Printer - How to print out Source Code (syntax highlighting)

Member 1247082419-Apr-16 5:03

Member 12470824

19-Apr-16 5:03

You may solve the issue you described with the additional software. If you need access serial port here is instructions Access Serial Port over Network: Serial to Ethernet Connector - Remote COM port over Internet[^], but to access remote USB port you will need this USB Redirector - redirect USB devices over Network - USB redirection[^]

call dll on client side

Member 435374515-Jul-09 21:15

Member 4353745

15-Jul-09 21:15

Hello all,
I have a dll from a card reader...
I encapsulate this dll into a ASP.NET Class Library...
and compile it into my own CardReaderWriter.DLL.
this Class library has methods..
the card reader will be connected in client computer..
Since it's on client side, i can not use ASP .NET to call and use the Class Library
Do I need to Copy this dll to client machine and register it .
How do i create an object of this on client side to access the methods ...
i tried using javascript new ActiveXObject() method but its giving me a runtime error "The system cannot find the file specified"
i even tried the object tag but gives me the error that object doesnot support this property
Note:- i have already compiled and registered the Dll on client machine to be safe but still not able to do it.
plz guide me to the right direction.
if possible plz provide sample codes and links to articles.
thanx in advance

mukeshmkg

akamper15-Jul-09 21:09

akamper

15-Jul-09 21:09

Hello

I have a question concerning printing out source code (in my case VBScript Source) with highlighted syntax, line numbering etc.

I'm actually working on a printer routine.
It should be possible to print out a "VBScript Code Snippet".

How is it possible to print out that code a syntax highlighted way?

Is there already a .NET standard method to do this?
Or do I have to parse every command to color it?

Thanks in advance for any advices

use dataset with case statement

Mamphekgo Bahula15-Jul-09 20:54

Mamphekgo Bahula

15-Jul-09 20:54

Hi i populate dataset with data from uif table and one of the colum is marriage status which is integer so i want to you case statement where for example if marriage_status is 1 then it has to display single on detailsview.

here is my code

int MarriageStatus = (int)dataset.Tables["uif"].Rows[0]["marriage_stat"];
string status = Convert.ToString(MarriageStatus);
switch(MarriageStatus){
case 0:
status="Single";
break;
case 1:
status="Single";
break;
case 2:
status = "married";
break;
case 3:
status="Widowed";
break;
case 4:
status="Divorced";
break;
}

Mamphekgo

Re: use dataset with case statement

Mycroft Holmes15-Jul-09 21:02

Mycroft Holmes

15-Jul-09 21:02

And you problem is?

You could have

Case 0:<br />
Case 1:<br />
   status = "Single"<br />
   break;<br />
case 2:

Never underestimate the power of human stupidity
RAH

How to use public int?!!?!!? windows form.

dimo198215-Jul-09 20:39

dimo1982

15-Jul-09 20:39

Hello All

I`m very new to the programming so this might be easy question to all of you, i`m hoping someone can help me out.

So i`m trying to write very easy program in windows form but i have encountered the problem.

lets say that i have an event on the button1 (CLICK) which should pick up a random number and hold it in the memory unless i click it again to change it. My problem is that i cannot figure out how to use this variable which has been set up in the first place with another event button2(Click) which will use this variable and do other task with using int previously declared. Short example:

public void Random_Click(object sender, EventArgs e)
{
Random myRandom = new Random();
int myNumber = myRandom.Next(1,10);
}
public void Button2_Click(object sender, EventArgs e)
{
MessageBox(myNumber.ToString());
}

This will not work and i cannot find the way to get it right

plese help !!!

ichiganboya15-Jul-09 20:44

ichiganboya

15-Jul-09 20:44

one way is to declare a global variable try this:

public int myNumber;

public void Random_Click(object sender, EventArgs e)
{
Random myRandom = new Random();
myNumber = myRandom.Next(1,10);
}

public void Button2_Click(object sender, EventArgs e)
{
MessageBox(myNumber.ToString());
}

hope this helps

dimo198216-Jul-09 6:42

dimo1982

16-Jul-09 6:42

Hello still nothing cannot solve this problem, so what i tried is i tried declare variable as a (public int nameOfInteger) just before the method, in the begining oif the class and everywhere else. Still confused

thats my code

namespace ExerciseInt
{
    public partial class Form1 : Form
    {
      int newNumber;
        
        public Form1()
        {
            InitializeComponent();
           
        }

        public void button1_Click(object sender, EventArgs e)
        {
            Random myRandom = new Random
            myNumber = myRandom.Next(1,10);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MessageBox.Show(myNumber.ToString());
        }
    }
}

so when i click button1 variable should be set up and when click button2 i would like to see this variable in the message box.

looking forward to hear from you.

Huxley Stronghead16-Jul-09 10:07

Huxley Stronghead

16-Jul-09 10:07

Are you using some IDE? It would be helpful if you could give some error reports and I think I could think of one. Now, that would be newNumber and myNumber. Are those supposed to be the same? I think so. Sniff | :^)

I came, saw, and then coded.

Mycroft Holmes15-Jul-09 21:06

Mycroft Holmes

15-Jul-09 21:06

Your problem is working out the SCOPE of your variable.
If you declare it in the method it dies when the method completes.
if you declare it provate in the form (I ususally put them just before the form_load method) then the variable will be available until you close the form.

		public clsLimitValue oValue { get; set; }<br />
		private BindingSource oBS = new BindingSource();<br />
<br />
		private void frmNewLimit_Load(object sender, EventArgs e)

Never underestimate the power of human stupidity
RAH