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Steph and Doug--Thanks a million--you were absolutely right. For reasons that I do not understand, my mainform, Pform didn't exist! Following your suggestion, I checked its pointer (which by the way is accessible under the Run/Evaluate option). I really don't know why it had a NIL pointer...

This is crazy. I'm trying to change the caption on a label (class TLABEL) using a qualified name; e.g. Pform.hitNo.caption := 'trial' where Pform is the name of the form in which the label hitNo occurs. Pform is declared as type TPform inside a Main Form in a Unit called Partition. The Access...

Hi McMerfy The pointers were standard Pascal pointers specified as to type in a TYPE statement and created with the NEW operation. l Indeed the files were propely cosed using CloseFile before the delete and rename operations were applied.

Has anyone run into conflicts between pointers and certain file operations in Delphi 3.0? I was unable to use file procedures/functions ERASE, DELETEFILE, RENAME and RENAMEFILE after I invoked code involving manipulation of pointers. I was using a two-way linked list for sorting complex data...