Develop Reference

C# Connect via SSH and changing the file content

I am a C # amateur I am not a professional developer and would like to ask my colleagues for help, I would like to make a C # program that connects to an SSH server. Then, depending on the selected value in combobox, the program downloads the appropriate string and I would like to send it to the ssh server to the specified path path and save the value from the string to the file;)
I tried to rewrite the code but something did not work out and I stopped in my place ;( Can anyone help me. Thanks in advance for your help.
this is my code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Threading;
using Renci.SshNet;
namespace FileGenerator
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnConnect_Click(object sender, EventArgs e)
{
SshClient sshClient = new SshClient("192.168.1.22", 22, "root", "pass");
sshClient.ConnectionInfo.Timeout = TimeSpan.FromSeconds(120);
sshClient.Connect();
ShellStream shellStreamSSH = sshClient.CreateShellStream("vt-100", 80, 60, 800, 600, 65536);
Thread thread = new Thread(() => recvSSHData(shellStreamSSH));
thread.Start();
//I don't know how to get the information if it is connected correctly and change e.g. btnConnect label to Connected.
}
public static void recvSSHData(ShellStream shellStreamSSH)
{
while (true)
{
try
{
if (shellStreamSSH != null && shellStreamSSH.DataAvailable)
{
string strData = shellStreamSSH.Read();
}
}
catch
{
}
System.Threading.Thread.Sleep(200);
}
}
string data1 = "data1";
string data2 = "data2";
string data3 = "data3";
string check;
string path = "/home/test01/desktop";
string filename = "test.txt";
private void btnSend_Click(object sender, EventArgs e)
{
if (cmbData.SelectedIndex == 0)
{
check = data1;
MessageBox.Show(check);
}
else if (cmbData.SelectedIndex == 1)
{
check = data2;
MessageBox.Show(check);
}
else if (cmbData.SelectedIndex == 2)
{
check = data3;
MessageBox.Show(check);
}
else
{
MessageBox.Show("Choose a value");
}
//And now there should be an instruction that sends a string check to the server to path to file replacing its contents
}
}
}

Ok, I coped with everything but I am on the last step, how to save the contents of string to a file using client scp ??
string text= "bal bla bla bla bla"
string path = "#/home/test01/desktop/";
string filename = "test1.txt"
...
try
{
MemoryStream mStrm = new MemoryStream(Encoding.UTF8.GetBytes(text));
scpClient.Upload(mStrm, path + filename);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
I have error:
Renci.SshNet.Common.ScpException: scp: error: unexpected filename:
w Renci.SshNet.ScpClient.CheckReturnCode(Stream input)
w Renci.SshNet.ScpClient.UploadFileModeAndName(IChannelSession channel, Stream input, Int64 fileSize, String serverFileName)
w Renci.SshNet.ScpClient.Upload(Stream source, String path)
w FileGenerator.Form1.btnSend_Click(Object sender, EventArgs e) w C:\Users\backu\source\repos\FileGenerator\FileGenerator\Form1.cs:wiersz 192

Firebird embedded multiple user support

I'm trying to create an app that communicate with a Firebird 3.0 embedded database.
I need that two or more of my app instances can connect and edit the same database at the same time.
I had create the connection part and it works.
When I start the first instance it connects correctly, but when I try to access to the database with another app it raise this error: Error while trying to open file -Impossible to open the file.
I also had try to connect with different account for example user2 and user1 (manually created with isql) but without results.
I search on google all day but I found nothing.
Any suggestion? Thanks in advance
This is the acutal code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Firebird;
namespace Firebird_multiuser
{
public partial class Form1 : Form
{
//private TextBox console = new TextBox();
Firebird.Firebird conn = new Firebird.Firebird();
public Form1()
{
InitializeComponent();
input_box.Text = #"G:\Coding\oribruniv8\Firebird\Firebird_multiuser\test.fdb";
}
private void button1_Click(object sender, EventArgs e)
{
if (conn.connect(input_box.Text))
console.AppendText("Successfully connect to database\n");
else
{
console.AppendText("Error during connection ...\n");
return;
}
}
}
}
Firebird class
using FirebirdSql.Data.FirebirdClient;
using FirebirdSql.Data.Isql;
namespace Firebird
{
public class Firebird
{
FbConnectionStringBuilder csb = new FbConnectionStringBuilder();
int pageSize = 8192;
bool forcedWrites = true;
bool overwrite = true;
FbConnection conn;
public Firebird()
{
csb.ClientLibrary = **correct path to fbclient.dll**;
csb.UserID = "sysdba";
csb.Password = "masterkey";
csb.ServerType = FbServerType.Embedded;
}
public bool create(string path)
{
csb.Database = path;
FbConnection.CreateDatabase(csb.ToString(), pageSize, forcedWrites, overwrite);
this.conn = new FbConnection(csb.ToString());
this.conn.Open();
return this.connection_check();
}
public bool connect(string path)
{
csb.Database = path;
this.conn = new FbConnection(csb.ToString());
this.conn.Open();
return this.connection_check();
}
public void query(string SQLquery)
{
this.conn.Open();
using (var transaction = this.conn.BeginTransaction())
using (var command = new FbCommand())
{
command.Connection = this.conn;
command.Transaction = transaction;
command.CommandText = SQLquery;
command.ExecuteNonQuery();
transaction.Commit();
}
}
private bool connection_check()
{
if (this.conn.State == ConnectionState.Open)
{
conn.Close();
return true;
}
else
{
return false;
}
}
}
}

If you want two or more apps to connect to the same database, it is time to consider installing Firebird server instead.
That said, if you are using Firebird 3 embedded, it is possible. By default, Firebird 3 embedded will require exclusive access to the database. This can be changed by making sure there is a firebird.conf in the same location as your fbclient.dll used by your application, and setting the ServerMode setting to SuperClassic (or ThreadedShared).
Doing this carries a small risk. If the database is shared, then all processes must use the same lock files. By default that is the case, but if applications have different FIREBIRD_LOCK environment variable settings, this can corrupt a database as each process will think it doesn't have contenders for its locks.

Send Print job from PuTTY to Zebra ZXP 3 SDK (non.zpl printer)

What I have is a medical record database that is accessed via PuTTY (SSH client). The cards themselves will only have Client name, record number in a barcode format (still determining the barcode type to be used), and client registration date.
1) We can get the data output as .zpl for Zebra Barcode label printers or formats compatible with laser printers like HP or Brother in a RAW format.
2) What output WILL the ZXP 3 SDK accept?
3) Can the SDK be set up to wait for and accept data coming at it using a command line from something like RedMon?
The cards themselves will only have the printed data, no mag stripe, smart chips, laminates or anything like that.
Mahalo in advance.

I would not recommend using either RedMon nor the SDK, as neither are required for what you are trying to do, and they both are time-vampires. Instead, I would write a small Windows Forms application which listens on a TCP port to receive the print job and send it to the standard printer which uses the Zebra driver.
Have the MUMPS application send an XML document via the Remote Print support in VT100. The example I have been using is below:
^[[5i
<patient>
<name first="John" last="Smith" />
<mrn>A04390503</mrn>
<dob>1991-03-12</dob>
</patient>
^[[4i
Configure a printer on the windows client to redirect to TCP/IP:
Add Printer
Local printer
Create a new port
Standard TCP/IP Port
Hostname: 127.0.0.1
Port name: CardFormatter
Uncheck "Query the printer and automatically select the driver to use"
Device type: Custom
Protocol: Raw
Port: 9101
Driver: Generic / Text Only
Start the application at logon, and print from the server. The MUMPS application will send back the XML, which Putty prints to the Text printer, which gets sent to the C# application on localhost. The C# application interprets the XML and prints to the actual printer via the Zebra driver or SDK.
Note: This only assumes one interactive session per workstation. If you are using fast-user-switching or terminal services, further care must be taken to ensure things work properly.
Example App:
Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace PassThroughPrinterTest
{
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TrayApplicationContext());
}
}
}
TrayApplicationContext.cs
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace PassThroughPrinterTest
{
class TrayApplicationContext : ApplicationContext
{
private NotifyIcon trayIcon;
private PrintListener listener;
private PrintHandler handler;
public TrayApplicationContext()
{
this.trayIcon = new NotifyIcon()
{
Text = "Card Formatter",
Icon = Properties.Resources.AppIcon,
ContextMenu = new ContextMenu()
{
MenuItems =
{
new MenuItem("Print Options...", miPrintOptions_Click),
new MenuItem("Exit", miExit_Click)
}
},
Visible = true
};
this.handler = new PrintHandler();
this.listener = new PrintListener(9101);
this.listener.PrintDataReceived += this.handler.HandlePrintData;
}
private void miPrintOptions_Click(object sender, EventArgs args)
{
// TODO: add configuration and options to avoid having to hard code
// the printer name in PrintHandler.cs
MessageBox.Show("Options");
}
private void miExit_Click(object sender, EventArgs args)
{
Application.Exit();
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
{
trayIcon.Dispose();
}
}
}
}
PrintHandler.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Printing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml.Linq;
namespace PassThroughPrinterTest
{
partial class PrintHandler : Form
{
public PrintHandler()
{
InitializeComponent();
}
public void HandlePrintData(object sender, PrintDataReceivedEventArgs args)
{
if (this.InvokeRequired)
{
this.Invoke(new EventHandler<PrintDataReceivedEventArgs>(HandlePrintData), sender, args);
return;
}
this.Show();
var sXml = Encoding.UTF8.GetString(args.PrintData);
this.PrintCard(XDocument.Parse(sXml));
this.Hide();
}
private void PrintCard(XDocument xDocument)
{
var nameElement = xDocument.Root.Element("name");
var lastName = nameElement.Attribute("last").Value;
var firstName = nameElement.Attribute("first").Value;
var mrn = xDocument.Root.Element("mrn").Value;
var printDoc = new PrintDocument()
{
PrinterSettings = new PrinterSettings()
{
PrinterName = "Adobe PDF"
},
DocumentName = "Patient ID Card"
};
var cardPaperSize = new PaperSize("Card", 337, 213) { RawKind = (int)PaperKind.Custom };
printDoc.DefaultPageSettings.PaperSize = cardPaperSize;
printDoc.PrinterSettings.DefaultPageSettings.PaperSize = cardPaperSize;
printDoc.PrintPage += (s, e) =>
{
var gfx = e.Graphics;
// print the text information
var fArial12 = new Font("Arial", 12);
gfx.DrawString(lastName, fArial12, Brushes.Black, new RectangleF(25, 25, 200, 75));
gfx.DrawString(firstName, fArial12, Brushes.Black, new RectangleF(25, 100, 200, 75));
// add a code39 barcode using a barcode font
// http://www.idautomation.com/free-barcode-products/code39-font/
// var fCode39 = new Font("IDAutomationHC39M", 12);
// gfx.DrawString("(" + mrn + ")", fArial12, Brushes.Black, new RectangleF(25, 200, 200, 75));
// or by using a barcode library
// https://barcoderender.codeplex.com/
// var barcode = BarcodeDrawFactory.Code128WithChecksum.Draw(mrn, 20, 2);
// gfx.DrawImage(barcode, 50, 200);
e.HasMorePages = false;
};
printDoc.Print();
}
}
}
PrintListener.cs
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace PassThroughPrinterTest
{
sealed class PrintListener : IDisposable
{
private TcpListener listener;
public event EventHandler<PrintDataReceivedEventArgs> PrintDataReceived;
public PrintListener(int port)
{
this.listener = new TcpListener(IPAddress.Loopback, port);
this.listener.Start();
this.listener.BeginAcceptTcpClient(listener_AcceptClient, null);
}
public void Dispose()
{
this.listener.Stop();
}
private void listener_AcceptClient(IAsyncResult iar)
{
TcpClient client = null;
bool isStopped = false;
try
{
client = this.listener.EndAcceptTcpClient(iar);
}
catch (ObjectDisposedException)
{
// this will occur in graceful shutdown
isStopped = true;
return;
}
finally
{
if (!isStopped)
{
this.listener.BeginAcceptTcpClient(listener_AcceptClient, null);
}
}
Debug.Assert(client != null);
try
{
byte[] printData;
using (var clientStream = client.GetStream())
using (var buffer = new MemoryStream())
{
clientStream.CopyTo(buffer);
printData = buffer.ToArray();
}
OnPrintDataReceived(printData);
}
catch
{
// TODO: add logging and error handling for network issues or processing issues
throw;
}
finally
{
client.Close();
}
}
private void OnPrintDataReceived(byte[] printData)
{
var handler = PrintDataReceived;
if (handler != null)
{
handler(this, new PrintDataReceivedEventArgs(printData));
}
}
}
}
TrayApplicationContext.cs
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace PassThroughPrinterTest
{
class TrayApplicationContext : ApplicationContext
{
private NotifyIcon trayIcon;
private PrintListener listener;
private PrintHandler handler;
public TrayApplicationContext()
{
this.trayIcon = new NotifyIcon()
{
Text = "Card Formatter",
Icon = Properties.Resources.AppIcon,
ContextMenu = new ContextMenu()
{
MenuItems =
{
new MenuItem("Print Options...", miPrintOptions_Click),
new MenuItem("Exit", miExit_Click)
}
},
Visible = true
};
this.handler = new PrintHandler();
this.listener = new PrintListener(9101);
this.listener.PrintDataReceived += this.handler.HandlePrintData;
}
private void miPrintOptions_Click(object sender, EventArgs args)
{
// TODO: add configuration and options to avoid having to hard code
// the printer name in PrintHandler.cs
MessageBox.Show("Options");
}
private void miExit_Click(object sender, EventArgs args)
{
Application.Exit();
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
{
listener.Dispose();
trayIcon.Dispose();
}
}
}
}
PrintDataReceivedEventArgs.cs
using System;
namespace PassThroughPrinterTest
{
class PrintDataReceivedEventArgs : EventArgs
{
public byte[] PrintData { get; set; }
public PrintDataReceivedEventArgs(byte[] data)
{
if (data == null)
throw new ArgumentNullException("data");
this.PrintData = data;
}
}
}

Automatic (bluetooth Pairing) with windows 7 and Mobile phone

Currently i am programming USB Bluetooth Dongle in C# 2010. I want to program in such a way that it automatically pairs with the Bluetooth device found. I don't want the user to manually accept the pairing request in both Mobile phone as well as in Windows 7. I am using my phone (X Peria S) to test this. Is this method of programming possible? I tried to code this using 32feet.net library for the Bluetooth, here is my code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using InTheHand.Net;
using InTheHand.Net.Bluetooth;
using InTheHand.Net.Sockets;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
private Guid service = BluetoothService.BluetoothBase;
private BluetoothClient bluetoothClient;
public Form1()
{
InitializeComponent();
}
private void Search_Bluetooth(object sender, EventArgs e)
{
BluetoothRadio.PrimaryRadio.Mode = RadioMode.Discoverable;
bluetoothClient = new BluetoothClient();
Cursor.Current = Cursors.WaitCursor;
BluetoothDeviceInfo [] bluetoothDeviceInfo = bluetoothClient.DiscoverDevices(10);
comboBox1.DataSource = bluetoothDeviceInfo;
comboBox1.DisplayMember = "DeviceName";
comboBox1.ValueMember = "DeviceAddress";
comboBox1.Focus();
Cursor.Current = Cursors.Default;
}
private void Pair(object sender, EventArgs e)
{
if (comboBox1.SelectedValue != null)
{
try
{
bluetoothClient.Connect(new BluetoothEndPoint((BluetoothAddress)comboBox1.SelectedValue, service));
MessageBox.Show("Connected");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
}
When i run this project i see the list of Bluetooth device in the surrounding but when ever i want to pair with it gives me an error saying "A connection attempt failed because the connected party did not properly respond a period of time"
I think the problem is private Guid service = BluetoothService.BluetoothBase but i am not sure, am i using the right service .BluetoothBase to pair with my phone?
Is there any existing solution for this? Any help and suggestion is highly appreciated.
Thanks.

You have to know the PIN for your dongle that will be requested during authentication.
If you want to connect to e.g. a mobile bluetooth RS-232 dongle, you have to know the PIN, but you don't have to accept the connection on the remote device (RS-232 dongle) because of the lack of a user interface. But on a mobile phone you have to.
I wrote the following interface:
interface IStackAdapter
{
IList<IRemoteBTDevice> DiscoveredDevices { get; }
void LoadStack();
void DoInquiry();
void DoConnection(IRemoteBTDevice rd);
void ReleaseLink();
}
Next, I implemented that interface for each different bluetooth stack. Here is the connection for a Widcomm stack:
/// <summary>
/// Connects to a remote device.
/// </summary>
/// <param name="rd">Remote device that the adapter is supposed to connect to.</param>
public void DoConnection(IRemoteBTDevice rd)
{
BluetoothAddress remoteAddress = new BluetoothAddress(Convert.ToInt64(rd.Id, 16));
BluetoothDeviceInfo bdi = new BluetoothDeviceInfo(remoteAddress);
try
{
if (!bdi.Authenticated)
{
string pair = rd.Pin; /* PIN for your dongle */
bool paired = BluetoothSecurity.PairRequest(bdi.DeviceAddress, pair);
}
}
catch (Exception ex)
{
//Log and rethrow
}
}

If you use a Windows Phone you can use the PeerFinder in Windows Phone to connect:
PeerFinder.AlternateIdentities["Bluetooth:PAIRED"] = "";
var available_devices = await PeerFinder.FindAllPeersAsync();
HostName hostName = null;
for (int i = 0; i < available_devices.Count; i++)
{
PeerInformation dispositivo = available_devices[i];
if (dispositivo.DisplayName.ToUpper() == /*Name of you device */)
{
hostName = dispositivo.HostName;
break;
}
}
if (hostName != null)
{
var socket = new StreamSocket();
await socket.ConnectAsync(hostName, "1");
}

C# how to stop the program after a certain time?

I have a big problem, but probably it's only big for me :). "terminal.Bind(client);" this line causes my program to hang if IP is bad. I want to stop this program after 5s working because if IP is wrong after 10s all program is hang.. :(
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Rebex.TerminalEmulation;
using Rebex.Security;
using Rebex.Net;
namespace Routers_info_v._1
{
class Program
{
static void Main(string[] args)
{
Telnet client = new Telnet("192.168.1.1");
VirtualTerminal terminal = new VirtualTerminal(80, 25);
terminal.Bind(client);
terminal.SendToServer("pass\r");
terminal.SendToServer("sys ver\r");
TerminalState state;
do
{
state = terminal.Process(2000);
} while (state == TerminalState.DataReceived);
terminal.Save("terminal.txt", TerminalCaptureFormat.Text, TerminalCaptureOptions.DoNotHideCursor);
terminal.Unbind();
terminal.Dispose();
}
}
}

Try to wrap the call in a try catch (assuming some exception is thrown):
try
{
terminal.Bind(client);
}
catch(Exception ex)
{
return;
}

You could kick off the Bind in a thread, and start a timer, if the thread takes X seconds too long to complete, you could kill the thread, or your application, whichever you choose.

You can use Task.Wait. Here is little simulation for an operation which will take 10 sec and you are waiting it for 5 sec to finish :)
using System;
using System.Linq;
using System.Data.Linq;
using System.Data;
using System.Threading.Tasks;
namespace ConsoleApplication5
{
class VirtualTerminal
{
public VirtualTerminal(int a, int b) { }
public bool Bind() { System.Threading.Thread.Sleep(10000); return true; }
}
class Program
{
static void Main(string[] args)
{
VirtualTerminal terminal = new VirtualTerminal(80, 25);
Func<bool> func = () => terminal.Bind() ;
Task<bool> task = new Task<bool>(func);
task.Start();
if (task.Wait(5*1000))
{
// you got connected
}
else
{
//failed to connect
}
Console.ReadLine();
}
}
}

I would suggest to put the network stuff into a second thread, which then may be aborted by the main thread.
class Program {
static void Main(string[] args) {
Thread thread = new Thread(threadFunc);
thread.Start();
Stopwatch watch = new Stopwatch();
watch.Start();
while (watch.ElapsedMilliseconds < 5000 && thread.IsAlive)
;
if (!thread.IsAlive) {
thread.Abort();
Console.WriteLine("Unable to connect");
}
}
private static void threadFunc() {
Telnet client = new Telnet("192.168.1.1");
VirtualTerminal terminal = new VirtualTerminal(80, 25);
terminal.Bind(client);
// ...
terminal.Dispose();
}
}