Hi,

We get an exception when using Xceed Zip RT .Net to open zips created by IP*Works! Zip ver. 6.

See the full error message and code below.

 Our questions:

1) How to know which compression method corresponds to each number in the error message?

What compression methods correspond to the 12336 and 22796 codes in the error message (see below) ?

2) How to make the Xceed ZipReader class use a custom or external reader when it finds an unknown compression method?

Code and the full exception message:

        public void UnzipFiles(string zipFileName, string destDir, out string log)
        {
            log = string.Empty;

            //The source Zip archive
            using (FileStream fileStream1 = new FileStream(zipFileName,
               FileMode.Open, FileAccess.Read))
            {
                //Must seek to the beginning of the stream before reading.
                fileStream1.Seek(0, SeekOrigin.Begin);

                //Create the ZipReader around the stream.
                Xceed.Zip.ReaderWriter.ZipReader zipReader1 = new
                  Xceed.Zip.ReaderWriter.ZipReader(fileStream1);

                zipReader1.InvalidPassword += new EventHandler<ZipReaderInvalidPasswordEventArgs>(zipReader_InvalidPassword);               

                ZipItemLocalHeader zipItemLocalHeader = null;
                //Read the local headers until no more are found

                /////////// next line throws the exception!
  //               ZipReader exception
  //               first :            CompressionMethod 12336 not supported by ZipReader.
  //               and other times:   CompressionMethod 22796 not supported by ZipReader.

                while ((zipItemLocalHeader = zipReader1.ReadItemLocalHeader()) != null)
                {
                    // sometimes this loop iterates once too often with an "\0\0\0\0" file name
                    // that doesn't exist in the zip archive -
                    // ignore this fake file name
                    if (zipItemLocalHeader.FileName.StartsWith((string)(new string('\0', 1))) &&
                        ! zipItemLocalHeader.IsFolder)
                        continue;
                    log += "\n\r\n file in zip: " + zipItemLocalHeader.FileName;
                    string extratedFileFullName = destDir + @"\\" + zipItemLocalHeader.FileName;
                    FileStream extractedFileStream = new FileStream(extratedFileFullName,
                        FileMode.Create);

                    byte[] buffer = new byte[8192];
                    int read = 0;

                    //Read the item's data until no more is left
                    while ((read = zipReader1.ReadItemData(buffer, 0, buffer.Length)) > 0)
                    {
                        //Do something with the data in 'buffer'
                        extractedFileStream.Write(buffer, 0, buffer.Length);
                    }
                    extractedFileStream.Flush();
                    extractedFileStream.Close();
                }
            }
        }

Thanks,

Ofer