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Simple function in C# to download a file from the internet, supports to resume the download.
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public static void downloadFile(string sourceURL, string destinationPath) | |
{ | |
long fileSize = 0; | |
int bufferSize = 1024; | |
bufferSize *= 1000; | |
long existLen = 0; | |
System.IO.FileStream saveFileStream; | |
if (System.IO.File.Exists(destinationPath)) | |
{ | |
System.IO.FileInfo destinationFileInfo = new System.IO.FileInfo(destinationPath); | |
existLen = destinationFileInfo.Length; | |
} | |
if (existLen > 0) | |
saveFileStream = new System.IO.FileStream(destinationPath, | |
System.IO.FileMode.Append, | |
System.IO.FileAccess.Write, | |
System.IO.FileShare.ReadWrite); | |
else | |
saveFileStream = new System.IO.FileStream(destinationPath, | |
System.IO.FileMode.Create, | |
System.IO.FileAccess.Write, | |
System.IO.FileShare.ReadWrite); | |
System.Net.HttpWebRequest httpReq; | |
System.Net.HttpWebResponse httpRes; | |
httpReq = (System.Net.HttpWebRequest) System.Net.HttpWebRequest.Create(sourceURL); | |
httpReq.AddRange((int) existLen); | |
System.IO.Stream resStream; | |
httpRes = (System.Net.HttpWebResponse) httpReq.GetResponse(); | |
resStream = httpRes.GetResponseStream(); | |
fileSize = httpRes.ContentLength; | |
int byteSize; | |
byte[] downBuffer = new byte[bufferSize]; | |
while ((byteSize = resStream.Read(downBuffer, 0, downBuffer.Length)) > 0) | |
{ | |
saveFileStream.Write(downBuffer, 0, byteSize); | |
} | |
} |
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