Error 3260--Could not find the entrypoint---DLL

[G. Briggs]

Hello,

I am fairly new to the world of calling DLL's from Progress. So I apologize in advance if the answer to my question is blatently obvious.

I have a DLL to which I need to pass parameters from Progress.
The DLL (which was developed using VB 6.0 )is single threaded and composed of 3 class modules. I have verified the spelling of my procedure in my VB code but when I run Progress I get error 3260 saying that the entrypoint could not be found. I have registered the DLL with regsvr32.exe. Also the class in which the DLL interface resides has it's Instancing property set to 5-MultiUse.

Here is the actual code:

NOTE: The values of c1 through c8 are being passed
to the .p by a .w in Appbuilder. (Assigns are being done in the
calling procedure).

================================

Progress code

================================

DEF INPUT PARAMETER c1 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c2 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c3 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c4 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c5 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c6 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c7 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c8 AS CHAR NO-UNDO.




RUN BeginConversionPub(INPUT c1, INPUT c2, INPUT c3, INPUT c4, INPUT c5, INPUT c6, INPUT c7, INPUT c8).

PROCEDURE BeginConversionPub EXTERNAL "ProgressToAccess.dll":

DEF INPUT PARAMETER c1 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c2 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c3 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c4 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c5 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c6 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c7 AS CHAR NO-UNDO.
DEF INPUT PARAMETER c8 AS CHAR NO-UNDO.

END PROCEDURE.

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//////////////////////////////////////////////////////////////
===================================

DLL interface in VB

===================================

Option Explicit






Dim clsrun As Main_class


Sub BeginConversionPub(strFromTxtFileName As String, strtodbpath As String, _
strtodatabasename As String, strdbpassword As String, strtoTableName As String, strtoFilePath As String, blnDummyRecord As String, blnCopyArchive As String)

Set clsrun = New Main_class


If clsrun.main(strFromTxtFileName, strtodbpath, strtodatabasename, strdbpassword, strtoTableName, strtoFilePath, blnDummyRecord, blnCopyArchive) = True Then

Else

MsgBox "Error calling subclass Main_class", vbCritical

Set clsrun = Nothing

End If

End Sub

===========================================
////////////////////////////////////////////////////////////////////////////
===========================================

Any assistance would be greatly appreciated. Have a great day.

 

[JonMeecham]

DLL Compile

Not sure exactly what the problem is but it might be because the DLL was compiled differently than the Progress default expects.

When defining an external procedure in a DLL there are three options that Progress can use CDECL, PASCAL and STDCALL. My guess would be that STDCALL (the Progress default) is not correct. Try using the other 2 options.

If that fails try putting an "_" before the program name.

Things to try:

PROCEDURE BeginConversionPub EXTERNAL "ProgressToAccess.dll" CDECL:

PROCEDURE BeginConversionPub EXTERNAL "ProgressToAccess.dll" PASCAL:

PROCEDURE BeginConversionPub EXTERNAL "_ProgressToAccess.dll" CDECL:

PROCEDURE BeginConversionPub EXTERNAL "_ProgressToAccess.dll" PASCALL:

PROCEDURE BeginConversionPub EXTERNAL "_ProgressToAccess.dll" STDCALL:

Hope one one these works.


Jon

 

[G. Briggs]

Thanks, Jon.

That didn't seem to work, but it was a good idea.

I spoke with someone at Progress support, and they suggested using an Automation object and passing parameters to the object's method.

I have met with limited success. Progress seems to be communicating with the DLL. However, I am getting an Error 5890 -- Authentication error.

The DLL has been registered and works fine when called from another VB application.

Does anyone have any thougths?

Thanks

 

[JonMeecham]

Memptr

Another possible problem could be the way Progress handles characters.

My suggestion would be to use a memory pointer instead (look at documentation on usage of MEMPTR, although there isn't much of it).

Other than this and the previous suggestion, I have no other ideas.

 

[G. Briggs]

It turns out that my error was due to a parameter not being set properly in the DLL I had created. Thanks again for you help.