Not able to refresh all field appearances sometimes

[Ryan]

Q:

When I call PDFDoc.RefreshFieldAppearances it throws an exception on some PDF files. How do I refresh the appearance of all fields?

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A:

This is caused by malformed (non-conforming) PDF files, which are throwing various errors.

The following code will allow you to traverse all the fields, ignoring any bad ones.

for(FieldIterator itr = pdfdoc.getFieldIterator(); itr.hasNext(); itr.next()) {
    try {
        Field field = itr.current();
        if(field.IsValid()) { field.RefreshAppearance(); }
    } catch(Exception e) {
        // ignore...
    }
}