How to get absolute path from path with system path variables?

问题

Is there an easy way to translate a path with system path variables to an absolute path?

So %ProgramFiles%\Internet Explorer\hmmapi.dll becomes C:\Program Files\Internet Explorer\hmmapi.dll

I like to know if there is an API call that can do this, or do I have to do this the hard way and detect %..% sequences and replace them with the corresponding environment variable?

回答1:

You can use the WinAPI function ExpandEnvironmentStrings:

function ExpandEnvStr(const szInput: string): string;
  const
    MAXSIZE = 32768;
  begin
    SetLength(Result,MAXSIZE);
    SetLength(Result,ExpandEnvironmentStrings(pchar(szInput),
      @Result[1],length(Result)) - 1);
  end;

来源：https://stackoverflow.com/questions/2833021/how-to-get-absolute-path-from-path-with-system-path-variables