I am trying to programatically unzip a zipped file.
I have tried using the System.IO.Compression.GZipStream class in .NET, but when my app runs (actually a unit test) I get this exception:
System.IO.InvalidDataException: The magic number in GZip header is not correct. Make sure you are passing in a GZip stream..
I now realize that a .zip file is not the same as a .gz file, and that GZip is not the same as Zip.
However, since I'm able to extract the file by manually double clicking the zipped file and then clicking the "Extract all files"-button, I think there should be a way of doing that in code as well.
Therefore I've tried to use Process.Start() with the path to the zipped file as input. This causes my app to open a Window showing the contents in the zipped file. That's all fine, but the app will be installed on a server with none around to click the "Extract all files"-button.
So, how do I get my app to extract the files in the zipped files?
Or is there another way to do it? I prefer doing it in code, without downloading any third party libraries or apps; the security department ain't too fancy about that...
Answer
With .NET 4.5 you can now unzip files using the .NET framework:
using System;
using System.IO;
namespace ConsoleApplication
{
class Program
{
static void Main(string[] args)
{
string startPath = @"c:\example\start";
string zipPath = @"c:\example\result.zip";
string extractPath = @"c:\example\extract";
System.IO.Compression.ZipFile.CreateFromDirectory(startPath, zipPath);
System.IO.Compression.ZipFile.ExtractToDirectory(zipPath, extractPath);
}
}
}
The above code was taken directly from Microsoft's documentation: http://msdn.microsoft.com/en-us/library/ms404280(v=vs.110).aspx
ZipFile is contained in the assembly System.IO.Compression.FileSystem. (Thanks nateirvin...see comment below)