Question

I need a solution that creates an InfoPath instance form from an XSN template that exists on a SharePoint server, I am using this approach but this extracts template files on temp directory of server that we may not have write permission to. Is there better solution for this?

Answer 1

You just change the CAB-library, to one that can extract the template file to memory, as this one,

Minimum C# code to extract from .CAB archives or InfoPath XSN files, in memory

And then call, myCab.ExtractFile("template.xml", out buffer, out bufferLen);

the complete code would look something like

private byte[] GetXmlForm(SPDocumentLibrary list) {
  byte[] data = null;
  SPFile file = list.ParentWeb.GetFile(list.DocumentTemplateUrl);


  Stream fs = file.OpenBinaryStream();
  try {
    data = new byte[fs.Length];
    fs.Read(data, 0, data.Length);
  } finally {
    fs.Close();
  }

  byte[] buffer;
  int bufferLen;  
  CabExtract cab = new CabExtract(data);
  cab.ExtractFile("template.xml", out buffer, out bufferLen);

  return buffer;
}