Set the BIF_NEWDIALOGSTYLE flag in the ulFlags member of the BROWSEINFO structure pointed to by the lpbi parameter. Specify a callback function in the lpfn member of that same BROWSEINFO structure. Code the callback function to receive the BFFM_INITIALIZED and BFFM_IUNKNOWN messages. On receipt of the BFFM_IUNKNOWN message, the callback function's lParam parameter contains a pointer to the dialog box's implementation of IUnknown. Call QueryInterface on that IUnknown to obtain a pointer to an instance of IFolderFilterSite. Create an object that implements IFolderFilter. Call IFolderFilterSite::SetFilter, passing to it a pointer to your IFolderFilter. IFolderFilter methods can then be used to include and exclude items from the tree. Once the filter is created, the IFolderFilterSite interface is no longer needed. Call IFolderFilterSite::Release if you have no further use for it.
Specify a callback function in the lpfn member of that same BROWSEINFO structure.
Code the callback function to receive the BFFM_INITIALIZED and BFFM_IUNKNOWN messages. On receipt of the BFFM_IUNKNOWN message, the callback function's lParam parameter contains a pointer to the dialog box's implementation of IUnknown. Call QueryInterface on that IUnknown to obtain a pointer to an instance of IFolderFilterSite.
Create an object that implements IFolderFilter.
Call IFolderFilterSite::SetFilter, passing to it a pointer to your IFolderFilter. IFolderFilter methods can then be used to include and exclude items from the tree.
Once the filter is created, the IFolderFilterSite interface is no longer needed. Call IFolderFilterSite::Release if you have no further use for it.