Question

I have been reading for a short while about GZipStream and its Write method. What I am attempting to do is convert the compressed data from the stream and put it in a byte array. I will leave you with my code below as I believe it will help significantly.

public static void Compress(byte[] fi)
{
    using (MemoryStream inFile = new MemoryStream(fi))
    using (FileStream outFile = File.Create(@"C:\Compressed.exe"))
    using (GZipStream Compress = new GZipStream(outFile, CompressionMode.Compress))
    {
        inFile.CopyTo(Compress);
    }
}

Rather than writing to a file on my disk, I would like to write the compressed data onto a byte array, and then return the byte array (assuming I made this a function of course).

Answer 1

You can simply use use another MemoryStream and its ToArray method.

public static byte[] Compress(byte[] fi)
{
    using (MemoryStream outFile = new MemoryStream())
    {
        using (MemoryStream inFile = new MemoryStream(fi))
        using (GZipStream Compress = new GZipStream(outFile, CompressionMode.Compress))
        {
            inFile.CopyTo(Compress);
        }
        return outFile.ToArray();
    }
}