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how to call c++ dll from vb dll

Posted on 2010-11-22
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how to call c++ dll from vb dll

i make the vb dll that i call from asp whit no problem(just test function) when i add cod to dll that use c++ dll i get that create object filed

the c++ dll is com (is it o.k or for it must be active-x dll for using it from asp?)

thanks
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Question by:yairab
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inthedark earned 500 total points
ID: 34194785
It is possible for ASP to call a C++ DLL that is not active-x. But you cannot do this directly.

The easy way, if you don't know C++ very well, is to create a VB ActiveX DLL wrapper for the DLL.

So in VB.Net create a new Class Library Project gibe the project a name like MyWrapper and use some code like this:

Public Class MyCCall
    Private Declare Function MyVBSubName Lib "MyDLLName.DLL" Alias "MyCSubName" (ByVal MyParam1 As Integer, ByRef MyUpdateableParam2 As Integer) As Integer


    Public Function MyVBCall(ByVal MyParam1 As Integer, ByRef MyUpdateableParam2 As Integer) As Integer

        Dim lC As Integer
        lC = MyVBSubName(MyParam1, MyUpdateableParam2)

    End Function

End Class


=====================
You put your C++ DLL in the Windows System32 folder in the above example that would be the MyDLLName.DLL.

To Call from ASP like this:


Dim Wrapper

Set Wrapper = Server.CreateObject("MyWrapper.MyCCall")

Dim Result
Dim Param2

Result = Wrapper.MyVBCall(123,Param2)


Hope this helps:~)
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