On Thu, 31 Jan 2008, Marwan Gedeon wrote:
I'm running through constraints in the format of an Excel file I have at
hand, as it's being downloaded from a carrier directly. My application
needs to read the excel file as is without preopening in Excel, then convert
it to CSV. POI fails to open it with the error:
java.io.IOException: Invalid header signature; read 4503629692403721,
expected -2226271756974174256
This error means that your file isn't a valid OLE2 document
One thing you could try doing is saving the file, and looking at it.
Perhaps it's not in excel format after all, but really something else?
If it is an excel file, but without the normal OLE2 wrapper (rare and odd,
but not un-heard of) you'll need to wrap it up as OLE2 before passing to
HSSF. Check the list archives for the appropriate few lines of POIFS code
to call.
Nick
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