How can I read an electronic file and see if the file begins with the string ‘%PDF’ in workflow SDK activity?
Any update please?
You would have to download the PDF edocument to a memory stream, then convert the stream to byte array, and finally analyze the first so may bytes to check for PDF signature.
Thanks. Do you have any sample code for that please?
I did not test this code nor did I code how to compare the byte arrays, but this is a starting point (assuming the edoc is already in the repository).
If BoundEntryInfo.EntryType = EntryType.Document Then
Using Doc As DocumentInfo = DirectCast(BoundEntryInfo, DocumentInfo)
Try
If Doc.ElecDocumentSize > 0 Then
Using msDoc As MemoryStream = New MemoryStream()
Dim CurExporter As DocumentExporter = New DocumentExporter()
' Export edoc to memorystream
CurExporter.ExportElecDoc(Doc, msDoc)
' Set up PDF signature
Dim PDFSig As Byte() = New Byte(){ 37, 80, 68, 70, 45, 49, 46 }
' Create byte arry to hold first 7 bytes of edoc
Dim LFDocSig As Byte()
' Load first 7 bytes of memorystream into byte array
memStream.Read(LFDocSig, 0, 7)
' Now compare the PDFSig and LFDocSig and if same, then it is a PDF
End Using
End If
Catch ex As Exception
WorkflowApi.TrackError(ex.Message)
End Try
End Using
End If