Handling asynchronous sockets in WinSock?

Question

I use the message box and WSAAsyncSelect. How can I track multiple sockets (clients) with a single message box?

Answer 1

Windows supports several socket modes, and you need to clearly indicate which one you are using:

• Blocking sockets. send and recv.
• Non-blocking sockets: send and recv return E_WOULDBLOCK, and select () is used to determine which sockets are ready
• Asynchronous Sockets: WSAAsyncSelect - Sockets send event notifications to HWND.
• EventSockets: WSAEventSelect - socket signal events.
• Overlapped Sockets: WSASend WSARecv OVERLAPPED. Overlapped Sockets IOCompletionPorts .

CAsyncSocket MFC.

, , WaitForMultipleObjects, 32.

IO CompletionPorts .

---

, Async Sockets :

• FD "" , , , , .

• GUI , : WM_TIMER WM_PAINT , . , , GUI SetTimer.

• , GUI . , , - WM_APP .

• FD - SocketObjects HWND, , WM_USER + , WASAsyncSelect. , WM_USER WM_USER + ( ), . WM_USER - 0x400, WM_APP - 0x8000, 31744 .

• . , . .

• HWND_MESSAGE -

Answer 2

wParam , WSAAsyncSelect() , , . WSAAsyncSelect() :

s, hWnd wMsg. WParam . lParam . lParam . - , Winsock2.h.