dtSearch Text Retrieval Engine Programmer's Reference
DConvertPathRequest Class

Used to convert among virtual, local, and UNC paths (Windows only)

File: dtsfc.h 

Namespace: dtSearch 

class DConvertPathRequest;
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Internet Information Server stores its mapping between virtual and local paths in the Metabase. Reading this information from the Metabase is time-consuming and requires access rights that may not be available to a process running in the 

web server context. Therefore, the dtSearch Engine caches this information in the registry, under the key HKEY_LOCAL_MACHINE\Software\dtSearch Corp.\dtSearch\Virtual Roots. By default, the conversion will use the cached table values. Call ConvertPath with the dtsCpRefreshMappings + dtsCpStoreInRegistry flags to update the cached information. (Running dtWebSetup.exe, the dtSearch Web Setup program, will also update this information.) 

If path conversion returns a blank string, it means that either (1) the folder passed in does not have a virtual directory associated with it, or (2) the registry tables have not been refreshed since the virtual directory was created.