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The FileSplitter reLoaded

, 11 Aug 2008 GPL3
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Utilty to quickly split and merge files.

Sample Image - TheFileSplitterv2Processing.jpg


Everybody needs at least twice a file splitter utility. One day I created my own just to do the things to be done :), and then I realized that I could make it run much faster (the FileSPlitter v0.1 runs @ 1~2bytes/hour ^_^), so I inserted some multithreading, some event handling, enlarged the cache used, and of course, rewrote the split and merge methods. Now, it's quite fast: up to 20 Mb/s.


The file splitter is now in a separate class, exposing different commented constructors, methods, and properties. It is disposable and gives the speed of the processing.

Using the code

Just instantiate the FileSplitter, manage its events, and begin processing.

FileSplitter.Splitter fs = new FileSplitter.Splitter(dlgOpen.FileName, 
                           dlgSaveTo.SelectedPath, CacheSize, SizeLimit);

fs.SplitDone += new EventHandler(fs_SplitDone);
fs.partialSplitDone += new EventHandler(fs_partialSplitDone);
fs.SplitError += new EventHandler(fs_SplitError);

The Split method is private to the FileSplitter class:

private void Split()
    if (m_CacheSize > m_SizeLimit)
        m_CacheSize = (uint)m_SizeLimit;

    byte[] cBuffer = new byte[m_CacheSize];
    int nCounter = 0;

    m_fsIn = new FileStream(m_FileName, FileMode.Open, FileAccess.Read);
    m_bReader = new BinaryReader(m_fsIn);

    if (!Directory.Exists(m_OutDir))
        Directory.Delete(m_OutDir, true);

    int reads = 0;
            m_fsOut = new FileStream(m_OutDir + "\\" + 
                      nCounter.ToString() + ".part", FileMode.Create);
                if ((m_fsIn.Length - m_fsIn.Position) < cBuffer.Length)
                    cBuffer = new byte[m_fsIn.Length - m_fsIn.Position];
                reads = m_bReader.Read(cBuffer, 0, cBuffer.Length);
                m_bWriter = new BinaryWriter(m_fsOut);
                m_bWriter.Write(cBuffer, 0, reads);
                m_Written += reads;// = fsIn.Position;
                m_Progress = (uint)((float)m_Written * 100 / (float)m_FileSize);
            } while ((m_fsOut.Position < m_SizeLimit) && 
                     (m_fsIn.Position < m_FileSize));
            m_Written = m_fsIn.Position;
            m_Progress = (uint)((float)m_Written * 100 / (float)m_FileSize);
        } while ((m_fsIn.Position < m_fsIn.Length));
    catch (Exception e)
        m_SplitErrorMessage = e.Message;

public void BeginMerge()
    m_tdMerger = new Thread(new ThreadStart(merge));
    m_tdMerger.Priority = ThreadPriority.AboveNormal;
    m_tdMerger.IsBackground = false;
    m_tdMerger.Name = "Merging";
    m_TimeStart = DateTime.Now;


  • public FileSplitter(string FileName, string DestinationFolder, int CacheSize, int SizeLimit): Fully qualified constructor - Splitting.
  • public FileSplitter(string FileName, string DestinationFolder, int SizeLimit): Constructor with default cache - Splitting.
  • public FileSplitter(string SourceFolder, int CacheSize): Fully qualified constructor - Merging.
  • public FileSplitter(string SourceFolder): Constructor with default cache - Merging.
  • public void Dispose(): Disposes the class instance.
  • public void BeginMerge(): Begins the merging thread.
  • public void BeginSplit(): Begins the splitting thread.


  • public event EventHandler partialCopyDone: Triggered when a partial processing is done.
  • public event EventHandler CopyDone;: Triggered when processing is done.
  • public event EventHandler Error;: Triggered when an error occurs.


  • public string ErrorMessage: Last error message
  • public int Progress: Percentage of the entire progress (nice to use with a progress bar).
  • public long TotalDone: Total size processed.


  • v2.1: Final version, with real classes, events, and multithreading.
  • V2.0: Events, multithreading, nicer and smoother.
  • v0.1: The beginning.


This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)


About the Author

Chief Technology Officer
Morocco Morocco
in his studies, erratum discovered c/c++.he appreciated it.
when he met oracle products, in his job, he fell in love.
he uses c# .net & ms sql.

he created a "f.r.i.e.n.d.s" like soap movie, melting all of the above.
went back in the university.
after he took courses of artificial vision & imagery, he finished his studies with a successful license plate recognition project.

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Comments and Discussions

QuestionMaximum file size Pin
brainchen10-Nov-12 19:42
memberbrainchen10-Nov-12 19:42 
QuestionGreat little dll file Pin
rspercy602-Oct-11 13:31
memberrspercy602-Oct-11 13:31 
GeneralFeedback/bugs Pin
Sander van Driel4-Apr-06 1:30
memberSander van Driel4-Apr-06 1:30 
GeneralRe: Feedback/bugs Pin
MikePEQ5-Apr-06 11:44
memberMikePEQ5-Apr-06 11:44 
AnswerRe: Feedback/bugs Pin
eRRaTuM10-Apr-06 3:20
membereRRaTuM10-Apr-06 3:20 
AnswerRe: Feedback/bugs Pin
eRRaTuM10-Apr-06 2:36
membereRRaTuM10-Apr-06 2:36 
GeneralRe: Feedback/bugs Pin
Sander van Driel10-Apr-06 3:23
memberSander van Driel10-Apr-06 3:23 
GeneralRe: Feedback/bugs Pin
eRRaTuM28-Jun-06 2:46
membereRRaTuM28-Jun-06 2:46 

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