I have been developing a vb front end for a client running on windows 2000 using the MapPoint COM object to access MapPoint at runtime. All has been running fine until I was asked to change the operating system to Windows XP SP2.

I installed all my development tools and project files along with the full version of MapPoint Europe 2004 on to a clean machine. The operating system was installed ( not upgraded ) with SP2 from the start.

Now I can not get the project to access MapPoint at all. I get the following error message.

"An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in axinterop.mappoint.dll

Additional information: MapPoint Europe can't run because it is not registered on your system, or it can't be found. Install MapPoint Europe and try again."

I have removed and installed MapPoint several times.

I have Norton Internet Security insatlled and defaults set, Windows XP firewall has been turned off by Norton.

Any suggestions as I really am up against a brick wall with this one.

Hi,

I assume the code compiles without errors. Maybe first check if the compilation is ok. What happens if you run your new exe on the old machine, and vice versa ?

Hi Wilfried

Thanks for taking the trouble to respond to my problem. I code compiles without errors in the design environment and runs fine on the old windows 2000 computer. I have even tried compiling the code in windows 2000 and running it on the xp machine but I still get the same errpr message. The COM control just does not recognise that MapPoint 2004 Europe is imstalled on the machine. The copy is a full copy and correctly installed and licensed so I just do not know what to do next. I posted the question in the chnace that someone more experienced than myself had either encounted the problem or knew of it.

Thanks again for your interest

Hi,

ok, assemblies are found etc.. I assume you have a visible mappoint control also in you IDE, so only at runtime... wierd...

- check if the needed files are in the search path. Maybe that path is longer on the new machine, and the new added (from mappoint) are truncated.
- eventually copy the files to application folder to test
- compare registry to check the keys generated by the installation program

I'm out of ideas, but maybe the one bring the other etc...

I have a similar problem. I've been using the mappoint control for 3 months now and the other day it just started coming back with this error.

The only difference i can see is that i am getting this error inside VS and can no longer compile my code.

'AxMapPoint.AxMapPointControl' is not defined

the refereneces are still there, but say:
<the system cannot find the reference specified>

Running XP SP2 and MP2004

any ideas?

Hi Alex,

did you changed anithing in your environment, in VS, or anything ? Can you try to remove the control from the component list and add it again ? What about search path (I dont know where to find in VS, but could something to do with that) ?

Hi,

Did you uninstall some program in dotnet ? There seems to be a bug with setup projects that if you dont watch carefully and you uninstall then some ocx files gets unregistered. See this link:

http://lab.msdn.microsoft.com/produc...a-37f40ec103e4