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procedure TForm1.Button1Click(Sender: TObject);
var params:tstringstream;result:tmemorystream;
begin
params:=tstringstream.Create('');
params.WriteString('username='+edit1.Text);
params.WriteString('passwort='+edit2.Text);
result:=tmemorystream.Create;
idhttp1.Post('http://localhost/post.php',params,result);
memo1.lines.loadfromstream(result);					

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var source: string;
begin
source:= idhttp1.Post('http://localhost/post.php',params);					

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[Error] Unit1.pas(44): There is no overloaded version of 'Post' that can be called with these arguments
[Fatal Error] Project2.dpr(5): Could not compile used unit 'Unit1.pas'					

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var
  PostDataStream : TStringStream;
  ParamData : TStringStream;
begin
  PostDataStream := TStringStream.Create('');
  ParamData := TStringStream.Create('');

  ParamData.WriteString('hier die parameter die übergeben werden soll');
  try
    IdHTTP.Post(FLoginUrl, ParamData, PostDataStream);

  except
    //..
  end;