Jonas Maebe wrote:
On 09 Mar 2012, at 22:26, Mark Morgan Lloyd wrote:Thanks Jonas, I don't think I need to do it but I thought it was a fair question: better safe than sorry. OK, so hopefully I can get away with another. I'm looking at a program written in Delphi, which reads a file containing the image of an IBM mainframe tape. This has a record: Type TAWSHeader=Record ThisSize: Word; ..If you want a record to have a predictable layout, always either a) use {$packrecords c} if it's a translation of a C struct, or b) declare it as "packed" In other cases, you can (and will) have problems across different platforms or even compiler versions.
Thanks Jonas, noted (although I invariably put lots of Assert(SizeOf()=) in initialization). It's actually pretty simple stuff, but derives from a card IBM designed which had a mainframe (big-endian) processor on it but plugged into an MCA (little-endian) system.
-- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk [Opinions above are the author's, not those of his employers or colleagues] _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
