Hello All,

I have a UserControl that subclasses to trap messages.  If my program
ends unexpectedly, (i.e., because of an error, the "end" keyword, or the
stop button,) the VB IDE crashes and shut down entirely.  When I reload
the project in VB, I get a message telling me to check my min form's
..Log file.  When I do, it contains the following error concerning my
UserControl class:

"Class [classname] in control [controlname] is not a loaded control class."

According to the ever brilliant MSDN:
"This message appears if Visual Basic finds a class name it doesnt
recognize."

All my code appears to be perfectly intact, yet VB won't load my
Usercontrol.  I've tried restarting, recompiling the user control, and
copying all of my code into a new project (big hassel.)  That last
option *sort of* works, but it's messy and lossy as far as properties go.

Any ideas on what do I do about this?

-Joel

Show quote Hide quote I don't do UserControls myself, so I can't address that aspect of the
problem. However, errors occurring during subclassing while running in
the IDE are a known problem. You can search the Google's Group section
for lots of threads about this. This one message may be of help
though...

http://groups-beta.google.com/group/microsoft.public.vb.general.discussion/browse_frm/thread/6ecfdecd075df4a1/ae0e5b2238c13dba?q=subclass+error+crash+group:*.vb*&rnum=2&hl=en#ae0e5b2238c13dba

Now... take out that End statement you indicate is in your program.
Using it is a disaster waiting to happen.

From an old post of mine...

Never, never, never, never, ever use the End statement to terminate your
program.

End should ***NEVER*** be used in VB. When you start writing more
complex code, you will find that in certain situations, VB needs to do
some cleaning up (and you need to help it). You can go to this Google
newsgroup link

http://groups.google.co.uk/advanced_group_search?num=100&as_scoring=d&as_ugroup=*.vb*

and look up the exact word "vb" and the exact phrase "end statement"
(leave off the quotes in both of these) to find the many ways people
have explained the why and what of not using the End statement. Suffice
it to say that the End statement stops your program in the same way
running into a brick wall stops your car... immediately. You don't get a
chance to coast to a stop and turn your key to the off position, open
the door and exit the vehicle. The same thing happens with the End
statement... BOOM!, everything stops dead in its tracks right then and
there and the program ends. The moral is... NEVER, NEVER, NEVER use the
End statement in your program! (And, in the same way, using that "solid
square" icon on VB's Toolbar, or clicking End in the Run menu, to stop
your project during development is the identical equivalent of executing
an End statement in code... you shouldn't do that either.)

Consider this... From the VB Help Files: "More About Forms"

"The End statement ends an application immediately: no code after the
End statement is executed, and no further events occur. In particular,
Visual Basic will not execute the QueryUnload, Unload or Terminate event
procedures for any forms. Object references will be freed, but if you
have defined your own classes, Visual Basic will not execute the
Terminate events of objects created from your classes."

"In addition to the End statement, the Stop statement halts an
application. However, you should use the Stop statement only while
debugging, because it does not free references to objects."


Rick - MVP

Rick Rothstein wrote:

Thanks Rick!  I'll check it out right now.

FYI- I don't use end statements - I close up by unloading all my forms
and other objects - just like you guys taught me since I joined this
newsgroups when I was 13.  I was just noting that "End" did the same
thing as an error.


I'm really grateful for your fast response!


-Joel

hi Joel,

Take some time to read Steve McMahon's article: "subclassing
without tears".

http://www.vbaccelerator.com/home/VB/Code/Libraries/Subclassing/SSubTimer/article.asp

It may encourage you to use Steve's execllent sSubTmr.dll
control for your subclassing in the future.

cheers, jw

Joel Whitehouse wrote:
Show quoteHide quote

Generating Trees for Data
Need some help in compressing bmp file to jpeg file
UDT question
APP behaves differently in IDE vs EXE
output to binary
Installing Fonts
Single Quotes Embedded in Data
DateSerial overflows
VB to MySQL connection
using user defined types