PRB: DDE Warning Message: Invalid Value: -32767 PSS ID Number: Q110873 Article last modified on 05-10-1994
3.10
WINDOWS
| The information in this article applies to: |
| - Microsoft Windows Software Development Kit (SDK) for Windows version 3.1 |
SYMPTOMS
When executing a call to DdeClientTransaction() from a Microsoft Foundation Class (MFC) Library application in the debug version of Windows 3.1, the following warning message is displayed in the debug monitor:
wn CLIENTAPP CallNextHookEx + 2C: Invalid value: -32767
CAUSE
This error message is caused by the _AfxMsgFilterHook hook procedure installed by the MFC. This hook procedure, found in line 408 of the APPCORE.CPP file of the MFC 1.0 source, incorrectly passes internal DDEML messages to the CallNextHookEx() function. When the hook procedure receives a MSGF_DDEMGR message, it should instead return FALSE.
For additional information on processing DDEML messages from a WH_MSGFILTER hook procedure, please see the following article(s) in the Microsoft Knowledge Base:
ARTICLE-ID: Q89828 TITLE : INF: Do Not Forward DDEML Messages from a Hook Procedure
RESOLUTION
Although this warning message is generally harmless, one way to keep this message from coming up is to modify the _AfxMsgFilterHook function in the APPCORE.CPP file (found in directory for Microsoft Visual C++ version 1.0) to return FALSE if (code == MSGF_DDEMGR), as the Microsoft Knowledge Base article referenced above recommends, and then rebuild the library.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Foundation Classes version 1.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.
Additional reference words: 3.10 KBCategory: Prg KBSubcategory: UsrDde
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Copyright Microsoft Corporation 1994.
