Question

DAO 3.6 with datagrid on XP (very urgent 1000+)

Asked by: daffyduck14mil

Hi,

I have a problem with all my legacy program's that were written in VB6 using DAO 3.6. The programs start without errors, but will not show me any data in my datagrids. If I break into the applications, the recordset objects do contain data, and are fully functional.

I have already copied and registered the ocx files for datagrid and data control, but that doesn't have any effect. I also installed all the MDAC's from version 2.6 (since 2.1 won't install on xp).

Please don't suggest to use the PDW, since that is an _absolute_ no go in this situation. If it is paramount that all the stuff should be done in a setup, it will be in MSI, for which I have no tools. I have been hacking into this problem for about a year, and I haven't come up with a solution.

I am willing to spend alot of points on this question, starting with 1000. Thanks in advance for any pointers or solutions.

Grtz.©

D.

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Asked On
2004-01-13 at 04:34:54ID20849398
Tags

dao

Topic

VB Database Programming

Participating Experts
3
Points
0
Comments
12

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Answers

 

by: leonstrykerPosted on 2004-01-13 at 05:58:58ID: 10103959

What do you mean by PDW and MSI?  Can we see the way the recordset is bound tot he grid.  Have you tryed setting up a brand new application with a grid and binding a recordset to it.

Leon

 

by: daffyduck14milPosted on 2004-01-13 at 06:06:45ID: 10104017

Leon,

PDW = Package and Deployment Wizard. MSI = Microsoft Installer Services.

The way the recordset is bound to the grid is straightforward DAO. The Datacontrol is bound to the grid, where columns have been defined. The whole setup is extremly basic (inherited programs).

Code:
Public Sub BindRecordsetToGrid()
  datCustomers.Recordset = g_rsCustomers
  dbgrdCustomers.Refresh
End Sub

And yes, I have tried to make a default exe with one grid, button and use SELECT * FROM CUSTOMERS; and bind it to the data control, same result. I do however have a XP machine (old installation at our head of network administration) and that does display the data in the grids. All DLL's and registry settings are the same (compared using filemon and regmon).

Grtz.©

D.

 

by: EDDYKTPosted on 2004-01-13 at 06:11:23ID: 10104059

What is SP?

 

by: daffyduck14milPosted on 2004-01-13 at 06:13:35ID: 10104076

Ed,

Service Pack levels are as follows:

Windows XP:
========
SP 1

Visual Basic 6:
=========
SP 5

The XP service pack is the same on both machines.

Grtz.©

D.

 

by: daffyduck14milPosted on 2004-01-13 at 06:14:51ID: 10104089

Additional data:
Almost all Hotfixes have been installed on the target machine.

 

by: leonstrykerPosted on 2004-01-13 at 06:15:11ID: 10104093

Is it possible for you to try a different binding method? Basically create a recordset and bind it to the grid without the data control:


Public Sub BindRecordsetToGrid()
  Set dbgrdCustomers.Datasource = g_rsCustomers
End Sub

Try it in the fresh application to see if it works,
Leon

 

by: frodomanPosted on 2004-01-13 at 06:16:20ID: 10104102

Are you using MS Access as your data source?  If so, you may have to install the Jet engine manually because it is not included in MDAC 2.6 or later.  If your old installation already had an older version of MDAC installed, then it would already have the Jet drivers and that could explain why it works there.

Obviously this doesn't apply if you aren't using Access.

 

by: daffyduck14milPosted on 2004-01-13 at 06:24:47ID: 10104185

Leon,

The syntaxt you propose is ADO. In DAO you will get an error saying "430, Class does not support automation or does not support expected interface". So that's something I can't do.

Frodo,

Yes, the back-end is MS Access. And I manually installed the DLL's needed for DAO support. Otherwise, I would have gotten an error saying something in the lines of "ActiveX can't create component" or "Class not registred" depending on the first database instruction. Also, version 2.1 of the MDAC can't be installed on XP (it's too old).

Grtz.©

D.

 

by: daffyduck14milPosted on 2004-01-13 at 07:22:01ID: 10104830

YEEEEEAAAAH!

I have found the problem and the solution.

The problem was in a DLL called vb5db.dll. It is an ICursor implementation that is needed on XP. The machine that worked had the DLL, and the machine that didn't work well, didn't. Main question now is, why the filemon and regmon didn't notice the dependency. But that's all out of the way now.

I will delete this question, and give 50 points for all that helped here.

Grtz.©

D.

 

by: daffyduck14milPosted on 2004-01-13 at 07:44:38ID: 10105060

Thank you RomMod!

Grtz.©

D.

 

by: daffyduck14milPosted on 2004-01-13 at 08:09:53ID: 10105283

Hi,

I have opened "Points for X" questions in this topic area, if you are so kind to collect the points. Thank you for the time spend on this question.

Grtz.©

D.

20120131-EE-VQP-002

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