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Topic: IIS hangs on FDFCreate() or FDFSaveToBuf()
Conf: (P-PDF) Developers, Msg: 120133
From: rmathews
Date: 10/13/2004 01:43 AM

Platform : Windows 2000 server with .net 1.1
Code : asp.net dynamically populates the PDF based on a form selected to fill.

Problem behaviour: After any where from 350 to 1200 number of times request to populate a PDF is successful,
1. IIS Server hangs
2. some times not able to create the FDF object
3. or unable to serve the FDFSaveToBuf()

Error:
System.NullReferenceException: Object reference not set to an instance of an object.
at FDFACXLib.IFdfDoc.FDFSaveToBuf()

Solution at this point: Restart the IIS server

Code:

Dim FdfAcX As FDFACXLib.FdfApp
Dim fdfobj As FdfDoc
FdfAcX = CreateObject("FDFApp.FDFApp")
fdfobj = FdfAcX.FDFCreate()
'these are some flags getting set to change the property on the PDF


fdfobj.FDFSetValue("ErrorFD", errorString, True)
fdfobj.FDFSetFlags("Submit", 8, 2)
fdfobj.FDFSetFlags("Save", 8, 2)
fdfobj.FDFSetFlags("Refresh", 8, 2)
fdfobj.FDFSetFlags("SaveReturn", 8, 2)
fdfobj.FDFSetFlags("RequestGIS", 8, 2)
fdfobj.FDFSetFlags("RequestGIS1", 8, 2)
fdfobj.FDFSetFlags("RequestGIS2", 8, 2)
'strURLPath & strPDFPath has the path to the pdf to be opened
fdfobj.FDFSetFile(strURLPath & strPDFPath)
Response.ContentType = "application/vnd.fdf"
Response.Expires = 0
Response.ExpiresAbsolute = Now()
Response.AddHeader("pragma", "no-cache")
Response.AddHeader("cache-control", "private")
Response.CacheControl = "no-cache"
Response.BinaryWrite(fdfobj.FDFSaveToBuf())

fdfobj.FDFClose()
fdfobj = Nothing
FdfAcX = Nothing

HttpContext.Current.ApplicationInstance.CompleteRequest()







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