Using Third Party DLL with Access VBA
Hi,
I'm starting a project to integrate a third party add-in from SagePay to our in-house Access database and unsure on some of the basics. I've completed the following steps but not clear on where the initial problem lies. Any assistance appreciated..
1. Discovered that I need a type library (tlb file) for the dll so I generated file using regasm (have .net framework 4.5 installed which is a listed minimum requirement)
(regasm.exe in c:\windows\microsoft.net\f
2. Added a reference to the add-in to vba project
3. Declared function call for the add-in using documentation:
4. This is where my knowledge gets a bit sketchy; I assumed the add-in would include the tillinformation type definition which I checked in the object browser but this is not the case as it shows no members?
Hence, declared a VBA type as shown to match the documentation although documentation does not specify actual data types. I've tried varying strings / integers for some of the type declarations with no effect.
5. Now when I try to call the function fro a test form, I get a type mismatch with 'tillinformation' parameter so it’s obviously not happy with the declaration..
I don't know if the issue is with the add-in registration or the way I'm trying to declare the necessary types etc. so desperately in need of some guidance please! Thanks
I'm starting a project to integrate a third party add-in from SagePay to our in-house Access database and unsure on some of the basics. I've completed the following steps but not clear on where the initial problem lies. Any assistance appreciated..
1. Discovered that I need a type library (tlb file) for the dll so I generated file using regasm (have .net framework 4.5 installed which is a listed minimum requirement)
(regasm.exe in c:\windows\microsoft.net\f
regasm c:\sagepay\guardian\bin\Integral.Library.GuardianClient.dll /tlb
2. Added a reference to the add-in to vba project
3. Declared function call for the add-in using documentation:
Public Declare Function Process Lib "c:\sagepay\guardian\bin" ( _
ByVal transactionType As TRANSACTIONHOOK_TRANSACTIONTYPE, _
ByVal transactionAmount As Integer, _
ByRef tillInfo As TillInformation, _
ByRef transInfo As TransactionInfo) _
As Boolean
4. This is where my knowledge gets a bit sketchy; I assumed the add-in would include the tillinformation type definition which I checked in the object browser but this is not the case as it shows no members?
Hence, declared a VBA type as shown to match the documentation although documentation does not specify actual data types. I've tried varying strings / integers for some of the type declarations with no effect.
Public Type TillInformation
merchantname As String
address1 As String
address2 As String
address3 As String
address4 As String
phonenumber As String
sitenumber As String
tillnumber As String
receiptnumber As String
operatorid As String
End Type
5. Now when I try to call the function fro a test form, I get a type mismatch with 'tillinformation' parameter so it’s obviously not happy with the declaration..
I don't know if the issue is with the add-in registration or the way I'm trying to declare the necessary types etc. so desperately in need of some guidance please! Thanks
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Hi,
There are 2 types of DLL-s in this case:
1. C++ function library: these are the traditional windows DLL libraries. You cannot and don't need to register them just put into the same folder as the access database file or Windows\system32 folder. Then you can call functions from this library after you define them in VBA with Declare ...
2. OCX, OLE type library: you have to register them with regsvr32 into windows and/or add them to VBA project. This way you don't have to Declare any function using the library. Library becomes the part of VBA classes and you can create a new instance of any object with New.
There are 2 types of DLL-s in this case:
1. C++ function library: these are the traditional windows DLL libraries. You cannot and don't need to register them just put into the same folder as the access database file or Windows\system32 folder. Then you can call functions from this library after you define them in VBA with Declare ...
2. OCX, OLE type library: you have to register them with regsvr32 into windows and/or add them to VBA project. This way you don't have to Declare any function using the library. Library becomes the part of VBA classes and you can create a new instance of any object with New.
Can you point us to the documentation you mention?
SagePay is an internet-based service. In general, you interact with those from the desktop using a web service via SOAP, or communicate directly through URLs (REST) using methods like GET, PUT, etc
SagePay is an internet-based service. In general, you interact with those from the desktop using a web service via SOAP, or communicate directly through URLs (REST) using methods like GET, PUT, etc
Documentation attached. It's software called Guardian which handles transactions for integrated solutions. It's not platform specific by any means but ..
SagePay-Guardian-Setup-Guide.pdf
SagePay-Guardian-Setup-Guide.pdf
OK - tried that and now get a file location error.. not sure what file it could be referring to other than the dll which is in the c:\sagepay folder
'Fixed' that error after some research by adding /codebase to regasm command. However, I now have 'object required'
..using the object viewer, I can see that TransactionHook.TRANSACTIO
If your setting a reference, you don't need the declare's and they should be removed. Instead, you instantiate an object and then work with that. Your file not found may be coming out of that.
Also be aware that Access (VBA) lacks full support for the IDispatch interface, so you may find it simply doesn't work.
Jim.
Also be aware that Access (VBA) lacks full support for the IDispatch interface, so you may find it simply doesn't work.
Jim.
<<'object required'>>
You didn't set the Transaction object. Should be:
Dim transaction As New TransactionHook
Dim transactionType As TransactionHook.TRANSACTIO
Jim.
You didn't set the Transaction object. Should be:
Dim transaction As New TransactionHook
Dim transactionType As TransactionHook.TRANSACTIO
Jim.
Apologies, I really need to spend some time getting to grips with the ins and outs of this. I now have a type mismatch?
and BTW no points for me please. I didn't mean to butt in....just thought it was an interesting question.
Jim.
Jim.
You may need this:
Public Enum TRANSACTIONHOOK_TRANSACTIO
INT_TT_SALE = 0
INT_TT_REFUND
INT_TT_PREAUTH
INT_TT_FINALAUTH
INT_TT_PREAUTHPARTIAL
INT_TT_FINALAUTHADVISE
End Enum
I'm looking at the code example on page 20 of the docs and it shows:
Imports Integral.Library.GuardianC
which you don't have in VBA. Problem is, it's not showing all the values, which seems to be a mistake to me, but then this is .Net code in the examples. Scott may have more input on that. I don't do much .Net.
Jim.
Public Enum TRANSACTIONHOOK_TRANSACTIO
INT_TT_SALE = 0
INT_TT_REFUND
INT_TT_PREAUTH
INT_TT_FINALAUTH
INT_TT_PREAUTHPARTIAL
INT_TT_FINALAUTHADVISE
End Enum
I'm looking at the code example on page 20 of the docs and it shows:
Imports Integral.Library.GuardianC
which you don't have in VBA. Problem is, it's not showing all the values, which seems to be a mistake to me, but then this is .Net code in the examples. Scott may have more input on that. I don't do much .Net.
Jim.
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