[ACCEPTED]-How do you download and extract a gzipped file with C#?-gzip
To compress:
using (FileStream fStream = new FileStream(@"C:\test.docx.gzip",
FileMode.Create, FileAccess.Write)) {
using (GZipStream zipStream = new GZipStream(fStream,
CompressionMode.Compress)) {
byte[] inputfile = File.ReadAllBytes(@"c:\test.docx");
zipStream.Write(inputfile, 0, inputfile.Length);
}
}
To Decompress:
using (FileStream fInStream = new FileStream(@"c:\test.docx.gz",
FileMode.Open, FileAccess.Read)) {
using (GZipStream zipStream = new GZipStream(fInStream, CompressionMode.Decompress)) {
using (FileStream fOutStream = new FileStream(@"c:\test1.docx",
FileMode.Create, FileAccess.Write)) {
byte[] tempBytes = new byte[4096];
int i;
while ((i = zipStream.Read(tempBytes, 0, tempBytes.Length)) != 0) {
fOutStream.Write(tempBytes, 0, i);
}
}
}
}
Taken from a post 4 I wrote last year that shows how to decompress 3 a gzip file using C# and the built-in GZipStream 2 class. http://blogs.msdn.com/miah/archive/2007/09/05/zipping-files.aspx
As for downloading it, you can use 1 the standard WebRequest or WebClient classes in .NET.
You can use WebClient in System.Net to download:
WebClient Client = new WebClient ();
Client.DownloadFile("http://data.dot.state.mn.us/dds/det_sample.xml.gz", " C:\mygzipfile.gz");
then 2 use #ziplib to extract
Edit: or GZipStream... forgot 1 about that one
Try the SharpZipLib, a C# based library for compressing 2 and uncompressing files using gzip/zip.
Sample 1 usage can be found on this blog post:
using ICSharpCode.SharpZipLib.Zip;
FastZip fz = new FastZip();
fz.ExtractZip(zipFile, targetDirectory,"");
Just use the HttpWebRequest class in the System.Net namespace 4 to request the file and download it. Then 3 use GZipStream class in the System.IO.Compression 2 namespace to extract the contents to the 1 location you specify. They provide examples.
You can use the HttpContext object to download a csv.gz 2 file
Convert you DataTable into string using StringBuilder (inputString)
byte[] buffer = Encoding.ASCII.GetBytes(inputString.ToString());
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/zip";
HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}.csv.gz", fileName));
HttpContext.Current.Response.Filter = new GZipStream(HttpContext.Current.Response.Filter, CompressionMode.Compress);
HttpContext.Current.Response.AppendHeader("Content-Encoding", "gzip");
using (GZipStream zipStream = new GZipStream(HttpContext.Current.Response.OutputStream, CompressionMode.Compress))
{
zipStream.Write(buffer, 0, buffer.Length);
}
HttpContext.Current.Response.End();
You 1 can extract this downloaded file using 7Zip
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