I'm trying to lookup symbols using a function in one of the DTN libraries.
The reference manual specifies the way to call these function.
1. Enable the lib in the references (check)
2. Declare sub or function - here'e mine.
Private Declare Sub LookupSymbol Lib _
"C:\Program Files\DTN\IQFeed\DTNSymbollookup" (Symbol As String, Results As String)

Sub getsymbol()
Dim Symbol As String
Dim Results As String
Symbol = "IBM"
Call LookupSymbol(Symbol, Results)
Debug.Print Results
End Sub


3. Step into sub.
4. Fails at Call - Error message states:

Run-time error '453'
Can't find DLL entry point LookupSymbol in C:\Program Files\DTN\IQFeed\DTNSymbollookup.

I've tried variation in these parameters but it's not working.
Any ideas about what's wrong?

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Thanks for your help!