I am using the MappointControl on a form in a Visual Basic program and there seems to be a limit on the length of the string passed to the OpenMap method. I am using the full path in the string since my ptm file is not in the MapPoint default directory. If the string length <= 126 the map opens correctly; but if the string length is >= 127, then I get the following error in the Visual Basic debugger:

Run-time error '16385':
The file "..." cannot be located. Retype the filename and try again.

The file exists! If I use MapPoint outside the VB program it opens fine. I have carefully debugged this and the only difference is the length of the string passed to OpenMap method. There does not seem to be a way to change the default directory to avoid using the full path. The DefaultFilePath and Path properties of the MapPoint Application and Map objects are both read-only.

Any comments???

Hi,

max filename len is 255, but they probably wrote a bug in the interface using a signed variable instead of unsigned. so it flows over at >127.

A workaround is that you uste SUBST to substitute a drive name for the path that you wants to pass. another way is to map a network drive to it.