使用MD5的C#防病毒程序-BackgroundWorker/FileNotFoundException-路径不正确
本文关键字：FileNotFoundException- 路径 不正确 -BackgroundWorker 防病毒程序 MD5 使用 | 更新日期: 2023-09-27 18:28:00
我正在尝试创建一个防病毒程序，该程序从文本文件中提取一组5个MD5哈希，在用户使用浏览选择文件夹并单击扫描后，该程序应该遍历所有文件，在后台工作人员中为每个文件运行哈希并进行比较，如果结果是检测到的病毒，则将结果输入到列表框中。
目前代码正在捕获（FileNotFoundException），并且显示FilePath的消息框正在生成"Path1"Path2"Path3"，有人能解释我如何更正代码以正确馈送路径吗？我真的不明白"Path1"Path2"Path3"等等是从哪里来的？
以下代码：
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 System.IO;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
namespace TestAntivirus
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private int noofvirus = 0;
List<string> completehashes = new List<string>();
private void Browse_Click(object sender, EventArgs e)
{
folderBrowserDialog1.ShowDialog();
label1.Text = folderBrowserDialog1.SelectedPath;
noofvirus = 0;
label2.Text = "Viruses:" + noofvirus.ToString();
progressBar1.Value = 0;
listBox1.Items.Clear();
}
private void BDone_Click(object sender, EventArgs e)
{
this.Close();
}
private void BScan_Click(object sender, EventArgs e)
{
string[] scanned = Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.*", SearchOption.AllDirectories);
int numofscanned = scanned.Count();
progressBar1.Maximum = scanned.Length;
foreach (string item in scanned)
{
for (int i = 0; i < (numofscanned); i++)
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += new DoWorkEventHandler (backgroundWorker1_DoWork);
worker.RunWorkerAsync(i);
}
}
foreach (string hashes in completehashes)
{
try
{
StreamReader stream = new StreamReader(hashes);
string read = stream.ReadToEnd();
var lineCount = File.ReadLines(@"C:'Users'Neil Bagley'Desktop'ProjectWork'VirusHashes'Test5.txt").Count();
var virus = File.ReadAllLines(@"C:'Users'Neil Bagley'Desktop'ProjectWork'VirusHashes'Test5.txt");
foreach (string st in virus)
{
if (Regex.IsMatch(read, st))
{
MessageBox.Show("Virus Detected");
noofvirus += 1;
label2.Text = "Viruses: " + noofvirus.ToString();
listBox1.Items.Add(hashes);
}
progressBar1.Increment(1);
}
}
catch
{
string read = hashes;
var virus = File.ReadAllLines(@"C:'Users'Neil Bagley'Desktop'ProjectWork'VirusHashes'Test5.txt");
foreach (string st in virus)
{
if (Regex.IsMatch(read, st))
{
MessageBox.Show("Virus Detected");
noofvirus += 1;
label2.Text = "Viruses:" + noofvirus.ToString();
listBox1.Items.Add(hashes);
}
}
}
}
}
private static String MakeHashString(byte[] hashbytes)
{
StringBuilder hash = new StringBuilder(32);
foreach (byte b in hashbytes)
{
hash.Append(b.ToString("X2").ToLower());
}
return hash.ToString();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
string filePath = e.Argument.ToString();
byte[] buffer;
int bytesRead;
long size;
long totalBytesRead = 0;
try
{
using (Stream file = File.OpenRead(filePath))
{
size = file.Length;
using (HashAlgorithm hasher = MD5.Create())
{
do
{
buffer = new byte[4096];
bytesRead = file.Read(buffer, 0, buffer.Length);
totalBytesRead += bytesRead;
hasher.TransformBlock(buffer, 0, bytesRead, null, 0);
backgroundWorker1.ReportProgress((int)((double)totalBytesRead / size * 100));
} while (bytesRead != 0);
hasher.TransformFinalBlock(buffer, 0, 0);
e.Result = MakeHashString(hasher.Hash);
}
}
}
catch (FileNotFoundException)
{
MessageBox.Show("File not found in the specified path" + filePath);
}
catch (IOException)
{
MessageBox.Show("IOException");
}
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
completehashes.Add(e.Result.ToString());
progressBar1.Value = 0;
}
}
}
在之前给出的建议之后，我试图开始重新制作该项目，但我现在不确定为什么这只会在列表框中添加一个哈希，而不是像我所期望的那样添加"foreach（扫描中的字符串扫描）"，有人能解释吗？新尝试：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
namespace AntiVirus
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private int noofvirus = 0;
private string[] scanned;
private void BBrowse_Click(object sender, EventArgs e)
{
folderBrowserDialog1.ShowDialog();
label1.Text = folderBrowserDialog1.SelectedPath;
noofvirus = 0;
label2.Text = "Viruses:" + noofvirus.ToString();
progressBar1.Value = 0;
listBox1.Items.Clear();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
scanned = Directory.GetFiles(e.Argument.ToString(), "*.*", SearchOption.AllDirectories);
foreach (string scan in scanned)
{
byte[] buffer;
int bytesRead;
long size;
long totalBytesRead = 0;
using (Stream file = File.OpenRead(scan))
{
size = file.Length;
using (HashAlgorithm hasher = MD5.Create())
{
do
{
buffer = new byte[4096];
bytesRead = file.Read(buffer, 0, buffer.Length);
totalBytesRead += bytesRead;
hasher.TransformBlock(buffer, 0, bytesRead, null, 0);
backgroundWorker1.ReportProgress((int)((double)totalBytesRead / size * 100));
} while (bytesRead != 0);
hasher.TransformFinalBlock(buffer, 0, 0);
e.Result = MakeHashString(hasher.Hash);
}
}
}
}
private static String MakeHashString(byte[] hashbytes)
{
StringBuilder hash = new StringBuilder(32);
foreach (byte b in hashbytes)
{
hash.Append(b.ToString("X2").ToLower());
}
return hash.ToString();
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
listBox1.Items.Add(e.Result.ToString());
progressBar1.Value = 0;
}
private void BScan_Click(object sender, EventArgs e)
{
backgroundWorker1.RunWorkerAsync(folderBrowserDialog1.SelectedPath);
}
private void BDone_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
您为每个哈希设置了e.Result，但只有当RunWorkerCompleted事件被激发时，它才会被添加到列表框中。（当DoWork事件完成时，该事件只触发一次，因此只添加最后一个散列）
当您获得如下文件哈希时，我建议使用backgroundWorker1.ReportProgress第二个参数userState：
（注意，代码是未经测试的/psuedocode，但希望它能让你走上正轨）
//CalculateTotalProgress() is a fictional function returning total progress percentage
backgroundWorker1.ReportProgress(CalculateTotalProgress(currentFile,totalFiles), MakeHashString(hasher.Hash));
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
listBox1.Items.Add(e.UserState.ToString);
progressBar1.Value = e.ProgressPercentage;
}