Window socket blocking and non-blocking traffic

1.

Problem

The use of CSocket in multithreading can be problematic. I've had such a problem before. Because CSocket will hold some thread-related data, using CSocket across threads will assert

2

When designing the socket program in a multithreaded way, you will find that a program crash occurs when you use CAsyncSocket and its derived classes across threads. Cross-threading refers to the object calling the Create/attachhandle/attach function in one thread, and then calling other member functions in another thread. The following example is a typical cause of collapse.

CSocket cannot be used in a thread with no interface, only in a thread with windows, you can
Open a thread first, create a window in the thread, and hide the window as the window handle for this csocket.