W1044

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Identifier

The identifier for the $WARN directive: SUSPICIOUS_TYPECAST

Description

This warning flags typecasts like PAnsiChar(String) or PChar(AnsiString), which are casting between different string types without character conversion. If the code generating this warning calls a Win32 API routine, be sure that you use the wide version of the Win32 API routine when passing a String parameter:

var
  S: AnsiString;
begin
  MessageBox(0, PChar(S), 'Error', MB_OK);
end;

needs to be corrected to:

var
  S: AnsiString;
begin
  MessageBoxA(0, PAnsiChar(S), 'Error', MB_OK);
end;