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POFTP download chunk copy
 

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    <p>A while back I asked a question revolving around how to copy a file in chunks from one location to another: <a href="https://stackoverflow.com/questions/10354610/copyfileex-the-parameter-is-invalid-error">CopyFileEx &quot;The parameter is invalid&quot; error</a></p> <p>I received the following code which was quite helpful. </p> <pre><code> static void chunkCopyFile(string source, string destination, int bytesPerChunk) { uint bytesRead = 0; using (FileStream fs = new FileStream(source, FileMode.Open, FileAccess.Read)) { using (BinaryReader br = new BinaryReader(fs)) { using (FileStream fsDest = new FileStream(destination, FileMode.Create)) { BinaryWriter bw = new BinaryWriter(fsDest); byte[] buffer; for (int i = 0; i &lt; fs.Length; i += bytesPerChunk) { buffer = br.ReadBytes(bytesPerChunk); bw.Write(buffer); bytesRead += Convert.ToUInt32(bytesPerChunk); updateProgress(bytesRead); } } } } } </code></pre> <p>However, I now need to convert this code to use FTP instead. I tried the obvious of just passing the FTP path to the filestream but it gave me an error saying "unsupported".</p> <p>I already managed to get the file length, I'm just not sure how I can split the download into chunks. Any help is appreciated as always!</p> <p>Code so far(not much)</p> <pre><code>static void chunkCopyFTPFile(string destination, int bytesPerChunk) { uint bytesRead = 0; fWR = (FtpWebRequest)WebRequest.Create("ftp://" + FTP_SERVER_NAME + "/test.txt"); fWR.Method = WebRequestMethods.Ftp.DownloadFile; fWR.UseBinary = true; fWR.Credentials = new NetworkCredential(FTP_SERVER_USERNAME, FTP_SERVER_PASSWORD); FtpWebResponse response = (FtpWebResponse)fWR.GetResponse(); Stream responseStream = response.GetResponseStream(); StreamReader sR = new StreamReader(responseStream); sR.ReadToEnd(); sR.Close(); response.Close(); } </code></pre> <p>Final code (working):</p> <pre><code>using (Stream responseStream = response.GetResponseStream()) { using (BinaryReader bR = new BinaryReader(responseStream)) { using (FileStream fsDest = new FileStream(destination, FileMode.Create)) { BinaryWriter bw = new BinaryWriter(fsDest); int readCount; byte[] buffer = new byte[bytesPerChunk]; readCount = responseStream.Read(buffer, 0, bytesPerChunk); bytesRead += Convert.ToUInt32(readCount); updateProgress(bytesRead); while (readCount &gt; 0) { bw.Write(buffer, 0, readCount); readCount = responseStream.Read(buffer, 0, bytesPerChunk); bytesRead += Convert.ToUInt32(readCount); updateProgress(bytesRead); } } } } </code></pre>
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    1. COAre you looking for [FtpWebRequest](http://msdn.microsoft.com/en-us/library/system.net.ftpwebrequest.aspx) class?
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    2. CO@Reniuz I'm already using it! I'm just not sure of how to use it to download a file in chunks rather than all at once...
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    3. COCant see where you using it. I see just 2 file streams.
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