How to Flatten a Form?

I am using QuickPDF library 8.11.906   via C# wrapper. Trying to flatten a form that I previously filled in my application. Here is my [pseudo]code

LoadFromFile(path)
while(FormFieldCount() > 0)
{
   FlattenFormField(1);
}
SaveToFile()


FlattenFormField above returns 0 to indicate a problem while LastErrorCode returns 0 as well.

I was trying to add SetNeedAppearances(1) just after LoadFromFile with no change in behavior


What I am doing wrong?

UPDATE:
Well, I figured out that the code above won't produce any result if first field will fail to flatten for whatever reason

Here my new code

LoadFromFile(path)
total=FormFieldCount();
while( total> 0)
{
  FlattenFormField(total--);
}
SaveToFile()

Above code simply removes control's appearance: for edit field only value is shown but no box borders, radio buttons and checkboxes are gone. I called SetNeedAppearances(1) just after LoadFromFile but still no controls.

Any ideas what is wrong?







Edited by alecd4 - 29 Sep 11 at 8:27PM