そこで、SNMPを使用する基本的なWinFormアプリケーションをsnmpsharpnetから作成しようとしています。
「目」と「ジッター」の2つのボタンがあり、1つを押すとタイマーが開始し、タイマーハンドラー内で1分ごとにSNMPコードを実行します。
タイマーハンドラーからSNMP出力をテキストボックスに書き込もうとしていますが、プログラムを終了すると、スレッド例外または継続的な実行プロセスが発生します。
私はこれらの2つのエラーを修正するために非常に多くの異なることを試みたので、すべてを台無しにしている可能性がありますが、ここに私が持っているコードがあります：
using System;
using System.Net;
using SnmpSharpNet;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public static bool stop = false;
static bool min = false, sec = false, eye = false, jitter = false;
static string ipAdd = "";
static System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
static int alarmCounter = 1;
static bool exitFlag = false;
static TextBox textbox;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
textbox = outputBox;
}
private void IPtext_TextChanged(object sender, EventArgs e)
{
ipAdd = IPtext.Text;
}
private void stopButton_Click(object sender, EventArgs e)
{
stop = true;
timer.Stop();
}
// This is the method to run when the timer is raised.
private static void TimerEventProcessor(Object myObject,
EventArgs myEventArgs)
{
timer.Stop();
// If stop button has not been pressed then continue timer.
if (stop == false)
{
textbox.Clear();
// Restarts the timer and increments the counter.
alarmCounter += 1;
timer.Enabled = true;
/*
textbox.Invoke(
new MethodInvoker(
delegate { textbox.AppendText("fsjdaò"); }));
*/
System.IO.StreamWriter file;
if (eye == true)
{
file = new System.IO.StreamWriter("c:/Users/bshellnut/Desktop/Eye.txt", true);
}
else
{
file = new System.IO.StreamWriter("c:/Users/bshellnut/Desktop/Jitter.txt", true);
}
// SNMP community name
OctetString community = new OctetString("public");
// Define agent parameters class
AgentParameters param = new AgentParameters(community);
// Set SNMP version to 2 (GET-BULK only works with SNMP ver 2 and 3)
param.Version = SnmpVersion.Ver2;
// Construct the agent address object
// IpAddress class is easy to use here because
// it will try to resolve constructor parameter if it doesn't
// parse to an IP address
IpAddress agent = new IpAddress(ipAdd);
// Construct target
UdpTarget target = new UdpTarget((IPAddress)agent, 161, 2000, 1);
// Define Oid that is the root of the MIB
// tree you wish to retrieve
Oid rootOid;
if (eye == true)
{
rootOid = new Oid("1.3.6.1.4.1.128.5.2.10.14"); // ifDescr
}
else
{
rootOid = new Oid("1.3.6.1.4.1.128.5.2.10.15");
}
// This Oid represents last Oid returned by
// the SNMP agent
Oid lastOid = (Oid)rootOid.Clone();
// Pdu class used for all requests
Pdu pdu = new Pdu(PduType.GetBulk);
// In this example, set NonRepeaters value to 0
pdu.NonRepeaters = 0;
// MaxRepetitions tells the agent how many Oid/Value pairs to return
// in the response.
pdu.MaxRepetitions = 5;
// Loop through results
while (lastOid != null)
{
// When Pdu class is first constructed, RequestId is set to 0
// and during encoding id will be set to the random value
// for subsequent requests, id will be set to a value that
// needs to be incremented to have unique request ids for each
// packet
if (pdu.RequestId != 0)
{
pdu.RequestId += 1;
}
// Clear Oids from the Pdu class.
pdu.VbList.Clear();
// Initialize request PDU with the last retrieved Oid
pdu.VbList.Add(lastOid);
// Make SNMP request
SnmpV2Packet result;
try
{
result = (SnmpV2Packet)target.Request(pdu, param);
//textbox.Text = "";
}
catch (SnmpSharpNet.SnmpException)
{
textbox.Invoke(
new MethodInvoker(
delegate { textbox.AppendText("Could not connect to the IP Provided."); }));
timer.Stop();
//outputBox.Text += "Could not connect to the IP Provided.";
break;
}
// You should catch exceptions in the Request if using in real application.
// If result is null then agent didn't reply or we couldn't parse the reply.
if (result != null)
{
// ErrorStatus other then 0 is an error returned by
// the Agent - see SnmpConstants for error definitions
if (result.Pdu.ErrorStatus != 0)
{
// agent reported an error with the request
/*Console.WriteLine("Error in SNMP reply. Error {0} index {1}",
result.Pdu.ErrorStatus,
result.Pdu.ErrorIndex);*/
textbox.Invoke(
new MethodInvoker(
delegate { textbox.AppendText("Error in SNMP reply. " + "Error " + result.Pdu.ErrorStatus + " index " + result.Pdu.ErrorIndex); }));
//outputBox.Text = "Error in SNMP reply. " + "Error " + result.Pdu.ErrorStatus + " index " + result.Pdu.ErrorIndex;
lastOid = null;
break;
}
else
{
// Walk through returned variable bindings
foreach (Vb v in result.Pdu.VbList)
{
// Check that retrieved Oid is "child" of the root OID
if (rootOid.IsRootOf(v.Oid))
{
/*Console.WriteLine("{0} ({1}): {2}",
v.Oid.ToString(),
SnmpConstants.GetTypeName(v.Value.Type),
v.Value.ToString());*/
textbox.Invoke(
new MethodInvoker(
delegate { textbox.AppendText(v.Oid.ToString() + " " + SnmpConstants.GetTypeName(v.Value.Type) +
" " + v.Value.ToString() + Environment.NewLine); }));
//outputBox.Text += v.Oid.ToString() + " " + SnmpConstants.GetTypeName(v.Value.Type) +
//" " + v.Value.ToString() + Environment.NewLine;
file.WriteLine(v.Oid.ToString() + " " + SnmpConstants.GetTypeName(v.Value.Type) +
" " + v.Value.ToString(), true);
if (v.Value.Type == SnmpConstants.SMI_ENDOFMIBVIEW)
lastOid = null;
else
lastOid = v.Oid;
}
else
{
// we have reached the end of the requested
// MIB tree. Set lastOid to null and exit loop
lastOid = null;
}
}
}
}
else
{
//Console.WriteLine("No response received from SNMP agent.");
textbox.Invoke(
new MethodInvoker(
delegate { textbox.AppendText("No response received from SNMP agent."); }));
//outputBox.Text = "No response received from SNMP agent.";
}
}
target.Close();
file.Close();
}
else
{
// Stops the timer.
exitFlag = true;
}
}
private void eyeButton_Click(object sender, EventArgs e)
{
outputBox.Text = "Connecting...";
eye = true;
jitter = false;
stop = false;
timer.Tick += new EventHandler(TimerEventProcessor);
// Sets the timer interval to 5 seconds.
timer.Interval = 5000;
timer.Start();
// Runs the timer, and raises the event.
while (exitFlag == false)
{
// Processes all the events in the queue.
Application.DoEvents();
}
}
private void jitterButton_Click(object sender, EventArgs e)
{
outputBox.Text = "Connecting...";
eye = false;
jitter = true;
stop = false;
timer.Tick += new EventHandler(TimerEventProcessor);
// Sets the timer interval to 5 seconds.
timer.Interval = 5000;
timer.Start();
// Runs the timer, and raises the event.
while (exitFlag == false)
{
// Processes all the events in the queue.
Application.DoEvents();
}
}
private void Seconds_CheckedChanged(object sender, EventArgs e)
{
min = false;
sec = true;
}
private void Minutes_CheckedChanged(object sender, EventArgs e)
{
min = true;
sec = false;
}
}
}