MapForums

Hi there,
I'm using MP2004 in delphi 5. My application uses an OleContainer that initialise MP 2004 in this way:

OleContainer1.CreateObject('MapPoint.Map.EU.11', False);
OleContainer1.DoVerb(ovPrimary);
OleContainer1.OleObjectInterface.GetUserClassID(vG uid);
FMap := IDispatch(OleContainer1.OleObject) as _Map;

In the main form i introduce some components like textbox, buttons, Memo etc. and several times, when I shutdown the application, I have this message:

"Project1 has raised exception class EAccessViolation with message ' Access Violation at address 77ADCA82 in module "ole32.dll". Read of Address 00C2762C'. Process Stopped. Use Step or Run to Continue."

The addresses are the same everytime the exception comes up.

When I insert new buttons or textbox the exception raises; when I remove the new components the Exception does not raise.

It's very strange; could someone help me?

Thanks in advance.

Have a try with FMAP:=NIL when closing the application

Rainer

I tried to set FMAP := nil in the "OnClose" event of the main form but nothing changes.

For example: I inserted a TCustomWinSocket component on the form and the exception raised up. When removed the component the exception did not raise.

Could it be the OLE container?

yeah, i have the same problem in c++ builder 6.

i have a form with mappoint running in a olecontainer. opening and closing the complete application works without any error.

when i add a winsock component to the form, i get an exception after closing the form. when i remove the winsock component, everything seems to be OK.

what is going on here?

Hi,

maybe it is the olecontainer?

__________________
rgds, Wilfried Mestdagh
www.mestdagh.biz
MapPoint coding demo
Order MapPoint 2009 with Routing and User Tools Spreadsheet

I think this is something to do with components notifying each other when they are freed. The form is the owner of components that are created automatically and, as far as I can remember, when each component on the form is freed every other component on the form is notified. I think the ActiveX object might not be able to cope with knowing about components in the application being freed.

My solution was to create the TOLEContainer at run time and set its owner to its parent. This stopped the access violations.

My code for doing this was:

Make sure all variables gained from the FMap are also nil'd after use...