Real Mode TCP/IP Custom Blocking Hook Causes Computer to Hang (137799)


The information in this article applies to:

  • Microsoft LAN Manager 2.2
  • Microsoft Windows for Workgroups 3.1
This article was previously published under Q137799

SYMPTOMS

On your computer with the real mode TCP/IP protocol stack installed, when you run a Winsock program that uses a custom blocking hook routine, the program hangs during data transfers.

This problem does not occur with every Winsock program that uses a custom blocking hook routine.

CAUSE

Your custom blocking hook routine does not dispatch WM_TIMER messages causing your Winsock program to hang.

The default blocking hook dispatches all messages. Some programs require a custom blocking hook to provide additional functionality to the program, however, this custom blocking hook may lack the ability to dispatch WM_TIMER messages.

RESOLUTION

In the custom blocking hook routine, include a PeekMessage() call to remove WM_TIMER messages and dispatch them.
Modification Type:MajorLast Reviewed:10/23/2003
Keywords:KB137799
©2003 Microsoft Corporation. All rights reserved.