How can we get the real bytes of an attachment from the FILES.STREAM with .NET soap

Mon, 12 Aug 2019 11:57:31 +0000

with

EfficySession s = new EfficySession(...)
var dt = s.ExecuteSQLQuery("select * from ArdisICT.FILES WHERE K_TABLE=31000 AND K_1=:param1", 1, true, p2);
foreach (DataRow r in dt.Rows)
{
   string fname = r["PATH"].ToString();
   string streamv = r["STREAM"].ToString();
   byte[] bytes = s.ConvertFromBase64Attachment(streamv);
}

In bytes I get the zlib compressed data, but how can I get the right decompressed data?

Or can I use soap method similar to Efficy.getFileStream ?

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How can we get the real bytes of an attachment from the FILES.STREAM with .NET soap