DOCUMENT:Q133276 06-MAY-2001 [visualc] TITLE :FIX: ClassWizard Generates Incorrect UDN_DELTAPOS Handler PRODUCT :Microsoft C Compiler PROD/VER:winnt: OPER/SYS: KEYWORDS:kbwizard kbMFC KbUIDesign kbGrpDSUser kbVC500 kbVC600kbbuglist kbfixlist ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - The ClassWizard, used with: - Microsoft Visual C++ 32-bit Edition, versions 2.1, 2.2 ------------------------------------------------------------------------------- SYMPTOMS ======== ClassWizard creates incorrect code for a handler for the UDN_DELTAPOS notification message of the CSpinButtonCtrl common control. RESOLUTION ========== The generated handler function will look like this (assuming that the CSpinButtonCtrl is in a dialog): void CAboutDlg::OnDeltaposSpin1(NMHDR* pNMHDR, LRESULT* pResult) { NM_UPDOWN; // TODO: Add your control notification handler code here *pResult = 0; } Modify the code to look like this: void CAboutDlg::OnDeltaposSpin1(NMHDR* pNMHDR, LRESULT* pResult) { NM_UPDOWN* pUpDown = (NM_UPDOWN*)pNMHDR; // TODO: Add your control notification handler code here *pResult = 0; } By typecasting the pointer to the NMHDR structure, you can access additional data that is passed after the NMHDR. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Visual C++, 32-bit Edition, version 4.0. REFERENCES ========== For more information about the CSpinButtonCtrl and the up down common control, please see the Class Library Reference in Books Online and the Win32 Software Development Kit (SDK) documentation. Additional query words: 2.10 3.10 ClassWizard ====================================================================== Keywords : kbwizard kbMFC KbUIDesign kbGrpDSUser kbVC500 kbVC600 kbbuglist kbfixlist Technology : kbVCsearch kbAudDeveloper kbClassWizard Version : winnt: Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.