Get virtual path for a full path in asp classic

asp-classicserver.mappathvirtual-path

How can I get the virtual path for a full path in ASP classic. Note that the full path may be under a virtual directory and therefore the simplistic 

virtPath = Replace(fullPath, Server.MapPath("/"), "")

method will not work.

Edit: To clarify, an example follows

  • Full Windows File Path (known):
    \\MyServer\MyShare\Web\Site\Logs\Test.txt
  • My Website has a Virtual directory
    called Logs that Points to \\MyServer\MyShare\Web\Site\Logs\.
  • Virtual Path (unknown): /Logs/Text.txt
  • Http path (unknown, needed):
    http://Site/Logs/Test.txt
  • The code is in a asp page in the main app, not under any virtual directories. It is located on a separate server from the file in question.

  • IIS 6.0

    How do I find the virtual path from the full file path?

Best Answer

In case anyone's interested, Anthony Jones' answer showed me the way to getting the application's relative root consistently. So if you have a site at http://example.com and a local development equivalent at http://localhost/example, you can find your root with this function:

Function ToRootedVirtual(relativePath)
    Dim applicationMetaPath : applicationMetaPath = Request.ServerVariables("APPL_MD_PATH")
    Dim instanceMetaPath : instanceMetaPath = Request.ServerVariables("INSTANCE_META_PATH")
    Dim rootPath : rootPath = Mid(applicationMetaPath, Len(instanceMetaPath) + Len("/ROOT/"))
    ToRootedVirtual = rootPath + relativePath
End Function

You can then call it like this to get the root path:

ToRootedVirtual("/")

Which will return:

  • / on example.com
  • /example/ on localhost/example

You can also use it without the slash:

ToRootedVirtual("")
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