类似Windows Search的文件搜索系统

• 转自：http://www.cnblogs.com/wuhenke/archive/2010/04/08/1707691.html
• Download source files [.NET 1.1] - 35.9 Kb
• Download source files [.NET 2.0] - 860 Kb

 

 

Introduction

WinSearchFile is a program that I developed and I usually use it to search files on my PC.

Sometimes the search engine integrated with Explorer doesn't work fine, especially when I try to find text contained into files, so I decided to build my own search program.

There are a lot of search programs available to install on your PC but this one, without indexing your data, is simple and fast enough to help you in your search.

Inside the application

WinSearchFile layout is simple and quite similar to the Explorer integrated search. It is possible to write a pattern search (wildcards admitted) and/or a text to search into file contents (you can also decide for a case sensitive search).

In the "look in" area, you have all the disks of your computer (network connection included). To obtain this list, I use the DiskCollection class developed by dmihailescu in his Get Logical Drives Information article.

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///
 <
SUMMARY
>


///
 Add items for all floppy, 

///
 CD and hard drives.

///
 <
/
SUMMARY
>


private
 void
 LoadDisksComboBox()
{
    disksListBox.Items.Clear();

    //
 Try to use DiskCollection

    //
 retrieving drive information

    DiskCollection diskColl = new
 DiskCollection();
    if
 ( diskColl.Load() )
    {
        foreach
(DiskCollection.LogicalDriveInfo diskinfo in
 diskColl)
        {
            disksListBox.Items.Add(diskinfo.Name.ToString() + 
                                "
: "
+ diskinfo.Description );

        }
    }
    else

    {
        //
 otherwise build a drive list checking 

        //
 if a root directory exists

        for
 (char
 Ch = '
A'
; Ch <= '
Z'
; Ch++)
        {
            string
 Dir = Ch + @"
:\"
;

            if
 (Directory.Exists(Dir))
            {
                disksListBox.Items.Add( Ch+ @"
:"
 );
            }
        }
    }
}

Application shows alerts when you check a not-ready disk.

 

In the WinSearchFile application, I use threads to make the same search simultaneously on different targets; I use a thread for each target drive.

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///
 <
SUMMARY
>


///
 Start search

///
 <
/
SUMMARY
>


///
 <
PARAM
 name="sender"
>
<
/
PARAM
>


///
 <
PARAM
 name="e"
>
<
/
PARAM
>


private
 void
 btnSearch_Click(object
 sender, System.EventArgs e)
{

    //
 empty thread list

    for
 (int
 i = thrdList.ItemCount()-1; i>=0; i--)
    {
        thrdList.RemoveItem(i);
    }

    //
 clear the file founded list

    listFileFounded.Items.Clear();
    ContainingFolder = "
"
;

    //
 get the search pattern

    //
 or use a default

    SearchPattern = txtSearchPattern.Text.Trim();
    if
 (SearchPattern.Length == 0
)
    {
        SearchPattern = "
*.*"
;
    }

    //
 get the text to search for

    SearchForText = txtSearchText.Text.Trim();

    //
 clear the Dirs arraylist

    Dirs.Clear();

    //
 check if each selected drive exists

    foreach
 (int
 Index in
 disksListBox.CheckedIndices)
    {
        //
 chek if drive is ready

        String
 Dir = disksListBox.Items[Index].ToString().Substring(0
,2
);
        Dir += @"
\"
;
        if
 (CheckExists(Dir))
        {
            Dirs.Add(Dir);
        }
    }

    //
 I use 1 thread for each dir to scan

    foreach
 (String
 Dir in
 Dirs)
    {
        Thread oT;
        string
 thrdName = "
Thread"
 + ((int
)(thrdList.ItemCount()+1)).ToString();
        FileSearch fs = new
 FileSearch(Dir, SearchPattern, 
                        SearchForText, CaseSensitive, this
, thrdName);
        oT = new
 Thread(new
 ThreadStart(fs.SearchDir));

        oT.Name = thrdName;

        SearchThread st = new
 SearchThread();
        st.searchdir = Dir;
        st.name = oT.Name;
        st.thrd = oT;
        st.state = SearchThreadState.ready;
        thrdList.AddItem(st);
        oT.Start();
    }
}

Data about searching threads is stored in a list, and during the search process, you can see how many threads are running/ready/cancelled.

 

Threads use the FileSearch class to do their work. To update controls or data structures on main threads, use delegate functions. I defined a delegate function for the AddListBoxItem method:

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///
 <
SUMMARY
>


///
 Delegate for AddListBoxItem

///
 <
/
SUMMARY
>


public
 delegate
 void
 AddListBoxItemDelegate(String
 Text);

///
 <
SUMMARY
>


///
 Add a new item to the file founded list

///
 <
/
SUMMARY
>


///
 <
PARAM
 name="Text"
>
<
/
PARAM
>


public
 void
 AddListBoxItem(String
 Text)
{
    //
 I use Monitor to synchronize access 

    //
 to the file founded list

    Monitor.Enter(listFileFounded);

    listFileFounded.Items.Add(Text);

    Monitor.Exit(listFileFounded);
}

and one to update the thread state:

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///
 <
SUMMARY
>


///
 Delegate for UpdateThreadStatus function

///
 <
/
SUMMARY
>


public
 delegate
 void
 UpdateThreadStatusDelegate(String
 thrdName, 
                                         SearchThreadState sts);

///
 <
SUMMARY
>


///
 Store the new state of a thread

///
 <
/
SUMMARY
>


///
 <
PARAM
 name="thrdName"
>
<
/
PARAM
>


///
 <
PARAM
 name="sts"
>
<
/
PARAM
>


public
 void
 UpdateThreadStatus(String
 thrdName, SearchThreadState sts)
{
    SearchThread st = thrdList.Item(thrdName);
    st.state = sts;
}

On clicking the "Stop search" button, all the running threads are cancelled using the Abort method.

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///
 <
SUMMARY
>


///
 Stop searching

///
 <
/
SUMMARY
>


///
 <
PARAM
 name="sender"
>
<
/
PARAM
>


///
 <
PARAM
 name="e"
>
<
/
PARAM
>


private
 void
 btnStop_Click(object
 sender, System.EventArgs e)
{
    //
 some threads are running

    if
 (InProgress)
    {
        //
 Abort each searching thread in running status

        //
 and change its status to cancelled

        for
 (int
 i= 0
; i < thrdList.ItemCount(); i++)
        {
            if
 (((SearchThread)thrdList.Item(i)).state == 
                               SearchThreadState.running)
            {
                ((SearchThread)thrdList.Item(i)).state = 
                            SearchThreadState.cancelled;
                Thread tt;
                try

                {
                    tt = ((SearchThread)thrdList.Item(i)).thrd;
                    tt.Abort();
                }
                catch

                {
                }
            }
        }

    }
}

On double clicking on a result listbox item, WinSearchFile will open the corresponding containing folder.

 

To quick launch WinSearchFile, you can create a shortcut to it on your desktop and assign to this one a shortcut key.

 

Conclusion

I hope you enjoy this article.

New WinSearchFile version

The new WinSearchFile 2.0, built using Visual Studio 2005 and C# 2.0, contains the following new features:

• Single Instance Application using code written by Eric Bergman-Terrell .
• Search inside PDF files.
• Regular expression searching.
• Searching using IFilter.
• Max directory visit depth.
• File Creation Time or Last ACcess Time or Last Write Time searching
• directory list to search into.
• Save results button.

Here is a new screenshot:

 

About IFilter

User can decide to use installed IFilter to extract plaintext from files. To implement this interface I used 2 class developed by Dan Letecky .

The following code shows where I try to use IFilter to get plaintext:

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public
 static
 bool
 FileContainsText(String
 FileName, 
          String
 SearchForText, bool
 CaseSensitive, 
          bool
 UseRegularExpression, bool
 UseIFilter)
{
    bool
 Result = (SearchForText.Length == 0
);

    if
 (!Result)
    {
      //
 try to use IFilter if you have checked

      //
 UseIFilter checkbox

     if
 (Parser.IsParseable(FileName) && UseIFilter)
     {
         string
 content = Parser.Parse(FileName);
         //
 if content length > 0

         //
 means that IFilter works and returns the file content

         //
 otherwise IFilter hadn't read the file content

         //
 i.e. IFilter seems no to be able to extract

         //
 text contained in dll or exe file

         if
 (content.Length > 0
)
         {
             Result = containsPattern(SearchForText, 
                      CaseSensitive, UseRegularExpression, content);
             return
 Result;
         }
      }
      //
 scan files to get plaintext

      //
 with my routines

      if
 (FileName.ToLower().EndsWith("
.pdf"
))
      {
         //
 search text in a pdf file

         Result = SearchInPdf(FileName, SearchForText, 
                  CaseSensitive, UseRegularExpression);
      }
      else

      {
         bool
 Error;
         String
 TextContent = GetFileContent(FileName, out
 Error);

         if
 (!Error)
         {
            Result = containsPattern(SearchForText, 
                     CaseSensitive, UseRegularExpression, TextContent);
         }
      }
    }

    return
 Result;
}

The following screenshot shows the about box where it's possible to get the list of installed IFilter. To get this list I used a class developed by vbAccelerator.com .

 

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Massimo Beatini


Member

Occupation:	Web Developer
Location:	Italy

 

转自：http://www.codeproject.com/KB/files/winsearchfile.aspx

下载：http://download.csdn.net/source/1790306