Wednesday, September 24, 2008

Moving to a DLL

Can I put the OLE DB Client library in a DLL? I tried but got some compiler warnings (C4251) concerning some of the ATL class templates (CComPtr and CString). The reason is that other classes might inherit from these and template definitions are not always exportable.

To solve this problem, I replaced all references of CComPtr in the protected interface with raw COM pointers, which required me to implement some missing destructors. I also removed the protected CString in the CTable class and now the code cleanly compiles into a DLL.

You can download the rewritten sample code ( and and test them. Make sure that you place the OleDbClient project in a directory with the same name and at the same level of EditRow.

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