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Frequently Asked Questions

Retrieving a users login name.

Question:

How do I get the user's login name under 32-bit versions of Windows?

Answer:

This is easily accomplished by calling the GetUserName() Windows

API function:





procedure TForm1.Button1Click(Sender: TObject);

var

  buffer : array[0..255] of char;

  buffSize : DWORD;

begin

  buffSize := sizeOf(buffer);

  GetUserName(@buffer, buffSize);

  ShowMessage(buffer);

end;



Using an array of char the memory will be freed on termination 

of the application. 



Or Using Long Strings Like this: 



procedure TForm1.Button2Click(Sender: TObject);

var

  buffer : string;

  buffSize : DWORD;

begin

  buffSize:=128;

  SetLength(buffer,BuffSize);

  GetUserName(PChar(buffer), buffSize);

  ShowMessage(buffer);

end;



Using Long Strings, the memory will be freed when the String 

variable falls out of scope.

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