Question

I would like to know if it is possible to gzip a powerpoint file. the reason for me asking this question is because all of the article which I have found are gzipping a .txt and would like to know if its possible to gzip a .pptx.. through the use of c#.. the code below is what i am using

static void Main()
    {
    try
    {
        string anyString = File.ReadAllText("presentation.pptx");

        CompressStringToFile("new.gz", anyString);
    }
    catch
    {
        // Couldn't compress.
    }
    }

    public static void CompressStringToFile(string fileName, string value)
    {
    // A.
    // Write string to temporary file.
    string temp = Path.GetTempFileName();
    File.WriteAllText(temp, value);

    // B.
    // Read file into byte array buffer.
    byte[] b;
    using (FileStream f = new FileStream(temp, FileMode.Open))
    {
        b = new byte[f.Length];
        f.Read(b, 0, (int)f.Length);
    }


    using (FileStream f2 = new FileStream(fileName, FileMode.Create))
    using (GZipStream gz = new GZipStream(f2, CompressionMode.Compress, false))
    {
        gz.Write(b, 0, b.Length);
    }
    }

Answer 1

A .pptx file (also .docx and .xlsx) is already zipped. If you change the file extension to .zip and open the file you’ll see the contents.

So, while you should be able to gzip one of these files, it’s unlikely you’d see a great deal of further compression.