Knowledge Base

Calling CMSPTR over Thunking DLLs Causes Access Violation

Article ID: 162511

Article Last Modified on 11/4/2003

Microsoft SNA Server 3.0
Microsoft SNA Server 2.11 Service Pack 1

This article was previously published under Q162511

SYMPTOMS

When a 16-bit CPI-C application calls uses the Set_Prepare_To_Receive_Type(cmsptr) application programming interface (API) while running over the 16-bit-to-32-bit CPIC thunking interface, the application terminates abnormally with an application error.

CAUSE

The CPIC thunking interface was not handling this call correctly. In the thunking code, The Set_Prepare_To_Receive_Type(cmsptr) function is defined as:

CallProcEx32W(4,0xF,(DWORD)lpfn32, (DWORD)pConvID,<BR/>
(DWORD)pPTRType, (DWORD)pRetCode);

The function should be:

CallProcEx32W(3,0xF,(DWORD)lpfn32, (DWORD)pConvID,<BR/>
(DWORD)pPTRType, (DWORD)pRetCode);<

RESOLUTION

Apply the fix referenced below.

STATUS

Microsoft has confirmed this to be a problem in SNA Server 2.11, 2.11 Service Pack 1 (SP1). A supported fix is now available for 2.11 SP1, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Keywords: kbbug kbfix kbnetwork KB162511