directory recursive c# example stops before completing scan

J

John Brookes

I researched and found some code to do a directory scan using a
recursive algorithm, but tit mysteriously stops before completing the
recursion. I am including the code from Visual c#: Note that this code
searches for *.txt files, and if they have a certain pattern, displays
them.
I triede putting only one file on the HD down the directory tree but to
no avail
Anyone have any ideas whats wrong?

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading;

namespace RecursiveSearchCS
{
/// <summary>
/// Summary description for Form1
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
internal System.Windows.Forms.Button btnSearch;
internal System.Windows.Forms.TextBox txtFile;
internal System.Windows.Forms.Label lblFile;
internal System.Windows.Forms.Label lblDirectory;
internal System.Windows.Forms.ListBox lstFilesFound;
internal System.Windows.Forms.ComboBox cboDirectory;
/// <summary>
/// Required designer variable
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent
call.
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose(disposing);
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support: do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.btnSearch = new System.Windows.Forms.Button();
this.txtFile = new System.Windows.Forms.TextBox();
this.lblFile = new System.Windows.Forms.Label();
this.lblDirectory = new System.Windows.Forms.Label();
this.lstFilesFound = new System.Windows.Forms.ListBox();
this.cboDirectory = new System.Windows.Forms.ComboBox();
this.SuspendLayout();
//
// btnSearch
//
this.btnSearch.Location = new System.Drawing.Point(608,
248);
this.btnSearch.Name = "btnSearch";
this.btnSearch.TabIndex = 0;
this.btnSearch.Text = "Search";
this.btnSearch.Click += new
System.EventHandler(this.btnSearch_Click);
//
// txtFile
//
this.txtFile.Location = new System.Drawing.Point(8, 40);
this.txtFile.Name = "txtFile";
this.txtFile.Size = new System.Drawing.Size(120, 20);
this.txtFile.TabIndex = 4;
this.txtFile.Text = "*.txt";
//
// lblFile
//
this.lblFile.Location = new System.Drawing.Point(8, 16);
this.lblFile.Name = "lblFile";
this.lblFile.Size = new System.Drawing.Size(144, 16);
this.lblFile.TabIndex = 5;
this.lblFile.Text = "Search for files containing:";
//
// lblDirectory
//
this.lblDirectory.Location = new System.Drawing.Point(8,
96);
this.lblDirectory.Name = "lblDirectory";
this.lblDirectory.Size = new System.Drawing.Size(120, 23);
this.lblDirectory.TabIndex = 3;
this.lblDirectory.Text = "Look In:";
//
// lstFilesFound
//
this.lstFilesFound.Location = new System.Drawing.Point(152,
8);
this.lstFilesFound.Name = "lstFilesFound";
this.lstFilesFound.Size = new System.Drawing.Size(528, 225);
this.lstFilesFound.TabIndex = 1;
//
// cboDirectory
//
this.cboDirectory.DropDownWidth = 112;
this.cboDirectory.Location = new System.Drawing.Point(8,
128);
this.cboDirectory.Name = "cboDirectory";
this.cboDirectory.Size = new System.Drawing.Size(120, 21);
this.cboDirectory.TabIndex = 2;
this.cboDirectory.Text = "ComboBox1";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(688, 277);
this.Controls.AddRange(new System.Windows.Forms.Control[] {

this.btnSearch,
this.txtFile,
this.lblFile,
this.lblDirectory,
this.lstFilesFound,
this.cboDirectory});

this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application
/// </summary>
[STAThread]


static void Main()
{

Application.Run(new Form1());

}
private void btnSearch_Click(object sender, System.EventArgs e)
{
lstFilesFound.Items.Clear();
txtFile.Enabled = false;
cboDirectory.Enabled = false;
btnSearch.Text = "Searching...";
this.Cursor = Cursors.WaitCursor;
Application.DoEvents();
DirSearch(cboDirectory.Text);
btnSearch.Text = "Search";
this.Cursor = Cursors.Default;
txtFile.Enabled = true;
cboDirectory.Enabled = true;
}

private void Form1_Load(object sender, System.EventArgs e)
{
cboDirectory.Items.Clear();
foreach (string s in Directory.GetLogicalDrives())
{
cboDirectory.Items.Add(s);
}
cboDirectory.Text = "C:\\";
}

void DirSearch(string sDir)
{
try
{
foreach (string d in Directory.GetDirectories(sDir))
{
foreach (string f in Directory.GetFiles(d,
txtFile.Text))
{
StreamReader reader = new StreamReader(f);

try
{
do
{
Match m = Regex.Match(reader.ReadLine(),
"[1-9][0-9][0-9][ -][0-9][0-9][ -][0-9][0-9][0-9][0-9]");
if (m.Success)
{
lstFilesFound.Items.Add(f);
}

}
while (reader.Peek() != -1);
}

catch
{
//do nothing
}

finally
{
reader.Close();
reader = null;
}


//lstFilesFound.Items.Add(f);
}
DirSearch(d);
}
}
catch (System.Exception excpt)
{
Console.WriteLine(excpt.Message);
}
}
}
}
 
L

Lasse Vågsæther Karlsen

John said:
I researched and found some code to do a directory scan using a
recursive algorithm, but tit mysteriously stops before completing the
recursion. I am including the code from Visual c#: Note that this code
searches for *.txt files, and if they have a certain pattern, displays
Click to expand...
<snip>

Couple of things I wonder about:

1. you open every file in the directories scanned as a text file. Do you
know for certain that you *can* open every file? ie. that files are not
locked by other apps? and that every file can be opened as a text file?
2. you output exception information to the console, but this looks like
a windows app, do you know for certain that no exception is being output
to the console (which isn't shown for a normal windows app)

Try removing the try/catch block and just let crashes happen and see if
something turns up.
 
A

Ashutosh

I thing "reader.ReadLine()" can also create problem...

If you have a binary file then what???? either search for *.txt file, if
not, read the specified number of bytes from the stream then check them....

Cheers,
Ashutosh

---------------------------------------------
John Brookes said:
I researched and found some code to do a directory scan using a
recursive algorithm, but tit mysteriously stops before completing the
recursion. I am including the code from Visual c#: Note that this code
searches for *.txt files, and if they have a certain pattern, displays
them.
I triede putting only one file on the HD down the directory tree but to
no avail
Anyone have any ideas whats wrong?

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading;

namespace RecursiveSearchCS
{
/// <summary>
/// Summary description for Form1
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
internal System.Windows.Forms.Button btnSearch;
internal System.Windows.Forms.TextBox txtFile;
internal System.Windows.Forms.Label lblFile;
internal System.Windows.Forms.Label lblDirectory;
internal System.Windows.Forms.ListBox lstFilesFound;
internal System.Windows.Forms.ComboBox cboDirectory;
/// <summary>
/// Required designer variable
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent
call.
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose(disposing);
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support: do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.btnSearch = new System.Windows.Forms.Button();
this.txtFile = new System.Windows.Forms.TextBox();
this.lblFile = new System.Windows.Forms.Label();
this.lblDirectory = new System.Windows.Forms.Label();
this.lstFilesFound = new System.Windows.Forms.ListBox();
this.cboDirectory = new System.Windows.Forms.ComboBox();
this.SuspendLayout();
//
// btnSearch
//
this.btnSearch.Location = new System.Drawing.Point(608,
248);
this.btnSearch.Name = "btnSearch";
this.btnSearch.TabIndex = 0;
this.btnSearch.Text = "Search";
this.btnSearch.Click += new
System.EventHandler(this.btnSearch_Click);
//
// txtFile
//
this.txtFile.Location = new System.Drawing.Point(8, 40);
this.txtFile.Name = "txtFile";
this.txtFile.Size = new System.Drawing.Size(120, 20);
this.txtFile.TabIndex = 4;
this.txtFile.Text = "*.txt";
//
// lblFile
//
this.lblFile.Location = new System.Drawing.Point(8, 16);
this.lblFile.Name = "lblFile";
this.lblFile.Size = new System.Drawing.Size(144, 16);
this.lblFile.TabIndex = 5;
this.lblFile.Text = "Search for files containing:";
//
// lblDirectory
//
this.lblDirectory.Location = new System.Drawing.Point(8,
96);
this.lblDirectory.Name = "lblDirectory";
this.lblDirectory.Size = new System.Drawing.Size(120, 23);
this.lblDirectory.TabIndex = 3;
this.lblDirectory.Text = "Look In:";
//
// lstFilesFound
//
this.lstFilesFound.Location = new System.Drawing.Point(152,
8);
this.lstFilesFound.Name = "lstFilesFound";
this.lstFilesFound.Size = new System.Drawing.Size(528, 225);
this.lstFilesFound.TabIndex = 1;
//
// cboDirectory
//
this.cboDirectory.DropDownWidth = 112;
this.cboDirectory.Location = new System.Drawing.Point(8,
128);
this.cboDirectory.Name = "cboDirectory";
this.cboDirectory.Size = new System.Drawing.Size(120, 21);
this.cboDirectory.TabIndex = 2;
this.cboDirectory.Text = "ComboBox1";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(688, 277);
this.Controls.AddRange(new System.Windows.Forms.Control[] {

this.btnSearch,
this.txtFile,
this.lblFile,
this.lblDirectory,
this.lstFilesFound,
this.cboDirectory});

this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application
/// </summary>
[STAThread]


static void Main()
{

Application.Run(new Form1());

}
private void btnSearch_Click(object sender, System.EventArgs e)
{
lstFilesFound.Items.Clear();
txtFile.Enabled = false;
cboDirectory.Enabled = false;
btnSearch.Text = "Searching...";
this.Cursor = Cursors.WaitCursor;
Application.DoEvents();
DirSearch(cboDirectory.Text);
btnSearch.Text = "Search";
this.Cursor = Cursors.Default;
txtFile.Enabled = true;
cboDirectory.Enabled = true;
}

private void Form1_Load(object sender, System.EventArgs e)
{
cboDirectory.Items.Clear();
foreach (string s in Directory.GetLogicalDrives())
{
cboDirectory.Items.Add(s);
}
cboDirectory.Text = "C:\\";
}

void DirSearch(string sDir)
{
try
{
foreach (string d in Directory.GetDirectories(sDir))
{
foreach (string f in Directory.GetFiles(d,
txtFile.Text))
{
StreamReader reader = new StreamReader(f);

try
{
do
{
Match m = Regex.Match(reader.ReadLine(),
"[1-9][0-9][0-9][ -][0-9][0-9][ -][0-9][0-9][0-9][0-9]");
if (m.Success)
{
lstFilesFound.Items.Add(f);
}

}
while (reader.Peek() != -1);
}

catch
{
//do nothing
}

finally
{
reader.Close();
reader = null;
}


//lstFilesFound.Items.Add(f);
}
DirSearch(d);
}
}
catch (System.Exception excpt)
{
Console.WriteLine(excpt.Message);
}
}
}
}
Click to expand...
 

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