patlimosnero patlimosnero - 3 months ago 156
C# Question

File Copy with Progress Bar

I used this code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;

namespace WindowsApplication1 {
public partial class Form1 : Form {
// Class to report progress
private class UIProgress {
public UIProgress(string name_, long bytes_, long maxbytes_) {
name = name_; bytes = bytes_; maxbytes = maxbytes_;
}
public string name;
public long bytes;
public long maxbytes;
}
// Class to report exception {
private class UIError {
public UIError(Exception ex, string path_) {
msg = ex.Message; path = path_; result = DialogResult.Cancel;
}
public string msg;
public string path;
public DialogResult result;
}
private BackgroundWorker mCopier;
private delegate void ProgressChanged(UIProgress info);
private delegate void CopyError(UIError err);
private ProgressChanged OnChange;
private CopyError OnError;

public Form1() {
InitializeComponent();
mCopier = new BackgroundWorker();
mCopier.DoWork += Copier_DoWork;
mCopier.RunWorkerCompleted += Copier_RunWorkerCompleted;
mCopier.WorkerSupportsCancellation = true;
OnChange += Copier_ProgressChanged;
OnError += Copier_Error;
button1.Click += button1_Click;
ChangeUI(false);
}

private void Copier_DoWork(object sender, DoWorkEventArgs e) {
// Create list of files to copy
string[] theExtensions = { "*.jpg", "*.jpeg", "*.bmp", "*.png", "*.gif" };
List<FileInfo> files = new List<FileInfo>();
string path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
DirectoryInfo dir = new DirectoryInfo(path);
long maxbytes = 0;
foreach (string ext in theExtensions) {
FileInfo[] folder = dir.GetFiles(ext, SearchOption.AllDirectories);
foreach (FileInfo file in folder) {
if ((file.Attributes & FileAttributes.Directory) != 0) continue;
files.Add(file);
maxbytes += file.Length;
}
}
// Copy files
long bytes = 0;
foreach (FileInfo file in files) {
try {
this.BeginInvoke(OnChange, new object[] { new UIProgress(file.Name, bytes, maxbytes) });
File.Copy(file.FullName, @"c:\temp\" + file.Name, true);
}
catch (Exception ex) {
UIError err = new UIError(ex, file.FullName);
this.Invoke(OnError, new object[] { err });
if (err.result == DialogResult.Cancel) break;
}
bytes += file.Length;
}
}
private void Copier_ProgressChanged(UIProgress info) {
// Update progress
progressBar1.Value = (int)(100.0 * info.bytes / info.maxbytes);
label1.Text = "Copying " + info.name;
}
private void Copier_Error(UIError err) {
// Error handler
string msg = string.Format("Error copying file {0}\n{1}\nClick OK to continue copying files", err.path, err.msg);
err.result = MessageBox.Show(msg, "Copy error", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
}
private void Copier_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
// Operation completed, update UI
ChangeUI(false);
}
private void ChangeUI(bool docopy) {
label1.Visible = docopy;
progressBar1.Visible = docopy;
button1.Text = docopy ? "Cancel" : "Copy";
label1.Text = "Starting copy...";
progressBar1.Value = 0;
}
private void button1_Click(object sender, EventArgs e) {
bool docopy = button1.Text == "Copy";
ChangeUI(docopy);
if (docopy) mCopier.RunWorkerAsync();
else mCopier.CancelAsync();
}
}
}


posted here (the one that nobugz posted) in copying files and displaying the status in progress bar.

I wanted to continuously increment the value of the progress bar while copying, especially large files. What happens in this sample code is that the value in progress bar stops on every file copied and after one file has been copied it will then increment to the size of the next file to be copied. I wanted it to work like
CopyFileEx
in Windows that progress bar continuously increment when copying (I cant use
CopyFileEx
because I wanted to have my own implementation).

Answer

You need something like this:

    public delegate void ProgressChangeDelegate(double Persentage, ref bool Cancel);
    public delegate void Completedelegate();

    class CustomFileCopier
    {
        public CustomFileCopier(string Source, string Dest)
        {
            this.SourceFilePath = Source;
            this.DestFilePath = Dest;

            OnProgressChanged += delegate { };
            OnComplete += delegate { };
        }

        public void Copy()
        {
            byte[] buffer = new byte[1024 * 1024]; // 1MB buffer
            bool cancelFlag = false;

            using (FileStream source = new FileStream(SourceFilePath, FileMode.Open, FileAccess.Read))
            {
                long fileLength = source.Length;
                using (FileStream dest = new FileStream(DestFilePath, FileMode.CreateNew, FileAccess.Write))
                {
                    long totalBytes = 0;
                    int currentBlockSize = 0;

                    while ((currentBlockSize = source.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        totalBytes += currentBlockSize;
                        double persentage = (double)totalBytes * 100.0 / fileLength;

                        dest.Write(buffer, 0, currentBlockSize);

                        cancelFlag = false;
                        OnProgressChanged(persentage, ref cancelFlag);

                        if (cancelFlag == true)
                        {
                            // Delete dest file here
                            break;
                        }
                    }
                }
            }

            OnComplete();
        }

        public string SourceFilePath { get; set; }
        public string DestFilePath { get; set; }

        public event ProgressChangeDelegate OnProgressChanged;
        public event Completedelegate OnComplete;
    }

Just run it in separate thread and sunscribe for OnProgressChanged event

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