Microsoft KB Archive/117870

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FIX: HIERSVR Sample GetClipboardData Parameters Incorrect

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Q117870

1.50 WINDOWS kbprg kbfixlist kbbuglist -- The information in this article applies to: - The Microsoft Foundation Classes (MFC) included with: - Microsoft Visual C++ for Windows, version 1.5 -- SYMPTOMS ======== The HIERSVR sample for the MFC, version 2.5, incorrectly overrides the virtual function OnGetClipboardDatain its COleServerItem-derived class, CServerItem. This does not allow the sample to register its Clipboard format. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was fixed in MFC version 2.51, which is distributed with Visual C++, version 1.51. MORE INFORMATION ================ The prototype for OnGetClipboardData in the base class is virtual COleDataSource* COleServerItem::OnGetClipboardData(BOOL bIncludeLink, LPPOINT pptOffset, LPSIZE pSize); while the prototype in the derived class, CServerItem, is virtual COleDataSource* CServerItem::OnGetClipboardData(BOOL bIncludeLink, CPoint *pptOffset, CSize* pSize); These functions have different function signatures, so the compiler views them as separate, overloaded functions. As a result, the framework always calls the base class version. In HIERSVR, this means that GetClipboardData does not get called and the application's native Clipboard format is not posted to the Clipboard. The following steps demonstrate this problem and a workaround: 1. Start HIERSVR 2. Choose Edit from the Copy menu to copy an object to the Clipboard. 3. Start the OLE 2.01 toolkit, IDataObject viewer. 4. Choose Clipboard from Get Clipboard Object. - The formats posted to the Clipboard include CF_TEXT, CF_METAFILEPICT, Embed Source, and Object Descriptor. 5. Change the function CServerItem:;OnGetClipboardData to match the prototype of the base class,COleServerItem::OnGetClipboardData, so that the parameters are instead BOOL bIncludeLink, LPPOINT pptOffset, LPSIZE pSize. 6. Rebuild HIERSVR, and repeat steps 1 through 4. The Clipboard formats should now include "MFC 2.5 Hiersvr Sample". Additional reference words: 1.50 2.50 KBCategory: kbprg kbfixlist kbbuglist KBSubcategory: MfcMisc

Keywords : kb16bitonly kbnokeyword kbMFC kbVC

Issue type :

Technology : kbAudDeveloper kbMFC