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9.3

Passing String Arguments VBA / Visual Basic

Asked by CyberUnDead in Visual Studio, Visual Basic Programming, Microsoft Access Database

Tags: visual basic, vba, DLL

What is the proper way to pass string parameters between my host application, which is Access 2003, and my library, which is Visual Basic 6?

I am using the technique outlined in this article http://oreilly.com/pub/a/windows/2005/04/26/create_dll.html or here http://www.vb-helper.com/howto_make_standard_dll.html to create a standard DLL (not ActiveX/COM) using Visual Basic 6.  

My console output from the code below is:
false
false

If I hard code the string parameter as "\\server" inside the DLL it returns true. 
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'DLL Library
Public Function IsUNCPath(strPath As String) As Boolean
    On Error GoTo Error_Handle
 
    If Left(strPath, 2) = "\\" Then
        IsUNCPath = True
    Else
        IsUNCPath = False
    End If
 
Exit_Procedure:
    Exit Function
 
Error_Handle:
    Resume Exit_Procedure
End Function
 
 
'Calling Application
Private Declare Function IsUNC Lib "core" Alias _
    "IsUNCPath" (strPath As String) As Boolean
        
Sub TestCoreLibrary()
    Call LoadDLL("core.dll")   'load custom dll
    
    Debug.Print IsUNC("c:\") 'should return false
    Debug.Print IsUNC("\\server1") 'should return true
 
    Call UnloadDLL("core.dll") 'unload custom dll
End Sub
[+][-]10/22/09 05:31 AM, ID: 25633294Expert Comment

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[+][-]10/22/09 05:57 AM, ID: 25633539Accepted Solution

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About this solution

Zones: Visual Studio, Visual Basic Programming, Microsoft Access Database
Tags: visual basic, vba, DLL
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Solution Provided By: egl1044
Participating Experts: 2
Solution Grade: A
 
[+][-]10/22/09 06:53 AM, ID: 25634156Author Comment

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[+][-]10/22/09 07:21 AM, ID: 25634521Expert Comment

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