用HTTP实现多线程下载,采用c++ socke直接编写-HTTP download with multi-threaded, using a direct write c++ socke

http多线程下载的例子,支持断点续传,进过测试可用,学习线程编程和网络编程比较好的例子-http example of multi-threaded downloads and support HTTP, enter the test can be used to learn programming and network programming thread better example