下载指定网络验证码图片，并保存

var
stream:TMemoryStream;
begin
IdHTTP1.Get('http://www.jljj.cn/');
Stream := TMemoryStream.Create ;
idhttp1.Get('http://www.jljj.cn/thirdparty/cx/val.jsp?change=yes&random=',Stream);
stream.SaveToFile('d:\1.jpg');
image1.picture.loadfromfile('d:\1.jpg');