Question

I’m trying to migrate from Delphi 2007 to Embarcadero RAD Studio XE.
I’m getting tons of warnings.
They all look like this: I have a procedure where I declare a “String”:

procedure SendMail( ADestinataire,ASubject : String);

And I’m trying to call Windows API like:

  Res := MAPIResolveName(Session, Application.Handle,
    PAnsiChar(ADestinataire), MAPI_LOGON_UI, 0, PRecip);

So the warnings are:

W1044: Transtyping string into PAnsiChar suspect.

What am I doing wrong / how should I correct this (350 warnings…)?

Thank you very much

Answer 1

MAPIResolveName uses LPSTR parameter, which is PAnsiChar in Delphi. Simple MAPI does not support UTF16 strings (though it can be used with UTF8 strings), so if you adhere to simple MAPI you should use AnsiStrings, for example

procedure SendMail( ADestinataire,ASubject : AnsiString);

or better you can use

procedure SendMail( ADestinataire,ASubject : String);

and explicitly convert string parameters to AnsiStrings prior to calling MAPIResolveName

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Update
The whole Simple MAPI is now deprecated; Simple MAPI can be used with UTF8 strings, but it requires some changes in code and registry.

So if the question is about quick porting old ANSI Simple MAPI to Unicode Delphi, the best is to adhere to AnsiStrings.

A more solid approach is to abandon Simple MAPI completely and use Extended MAPI instead.