Ergebnis der Suchanfrage

• Forum: Object-Pascal / Delphi-Language

  AW: How to - string in DLL

    Delphi
    by jaenicke, 22. Jun 2011
  I think this is a problem with the size parameter.
  
  You always have to have in mind that one character is one byte in Delphi 7 and two bytes in Delphi 2010.
  
  How does the code for reserving the memory, ... look like?
• Forum: Object-Pascal / Delphi-Language

  AW: How to - string in DLL

    Delphi
    by jaenicke, 20. Jun 2011
  Well, for the version with PAnsiChar you append an A, and for PWideChar a W.
  For example the API has ShellExecuteA and ShellExecuteW. Delphi itself maps ShellExecute to ShellExecuteA (Delphi 1 - 2007) or to ShellExecuteW (Delphi 2009+). So you don't see that you call one of the other functions. ;-)
  
  Yes it is.
  
  I myself do not want to use it because it relies on OLE and the operating system....
• Forum: Object-Pascal / Delphi-Language

  AW: How to - string in DLL

    Delphi
    by jaenicke, 20. Jun 2011
  Oh ja, darauf hatte ich gar nicht geachtet... :oops:
• Forum: Object-Pascal / Delphi-Language

  AW: How to - string in DLL

    Delphi
    by jaenicke, 19. Jun 2011
  What about this:function Foonction(Data: PWideChar; Buffer: PWideChar; lenBuffer: Cardinal): Cardinal; external 'StringDLL.dll';
  
  var
  Buffer: string;
  BufferSize: DWORD;
  begin
  BufferSize := Foonction('bar', nil, 0);
  if BufferSize > 0 then
  begin
  SetLength(Buffer, BufferSize);
• Forum: Object-Pascal / Delphi-Language

  AW: Re: How to - string in DLL

    Delphi
    by jaenicke, 19. Jun 2011
  You try to copy lenBuffer Bytes from foo, but it does not have so many Bytes. ;-)
  
  By the way: I prefer the way most of the API functions work:
  First I ask for the buffer size needed, then I reserve enough memory and ask for the data itself.
• Forum: Object-Pascal / Delphi-Language

  AW: How to - string in DLL

    Delphi
    by jaenicke, 19. Jun 2011
  One inportant issue first:
  Always use PWideChar or PAnsiChar in DLL interfaces. Otherwise it depends on the Delphi version and what PChar means in it whether your program works or not...
  
  Regarding your problem:
  I don't see an error handling (you ignore the return value). And where does the exception occur? Inside the DLL function?
  
  And could you please post the source of the function...
• Forum: Object-Pascal / Delphi-Language

  AW: How to - string in DLL

    Delphi
    by jaenicke, 17. Jun 2011
  You can use PWideChar or PAnsiChar just as the Windows API internally uses too.
  
  If you want to return such a value:
  Just give a PWideChar and its size as variable parameter. If the size is not sufficient, you return the size you need. If the size is sufficient you copy the data into the buffer.
  
  This is the way the API manages it. And it works well.