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The dll was built with Delphi 6. The data I got back looked like garbage. Not sure if it was swapped but it was not truncated.
– votaroe
Commented Jun 14, 2010 at 22:36
So if you looked at your data before the call it was different then the data after the call, but it didn't resemble the data you were expecting at all?
– Jim McKeeth
Commented Jun 15, 2010 at 7:10
Yes if the setting is: UnmanagedType.LPStr the Init call works fine. If I call GetData the TMPData structure that I get back have garbage data for the firstname, lastname fields and default values for all the other fields. If I change to ByValTStr the Init call fails but I can still succesfully call GetData and the return values are correct from the previous successfull call of Init. I think I need to look at the Delphi code and try to figure out what is happening. I don't know delphi but hope that I can create a com delphi dll that is easier to use with interop than a standard dll
– votaroe
Commented Jun 15, 2010 at 18:25

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