Most significant bit in WM_COMMAND wparam

[Just Me]

I've seen this in examples:

Case User.WM_COMMAND

Select Case (m.WParam.ToInt32 And &H7FFF0000) \ &H10000



My question is why is the most significant bit ignored?

Does it have some significance or maybe not allowed





thanks

 

[Joakim Karlsson]

I think this is due to VB's lack of bit operations, but then again I
can't tell VB from a hole in the ground

Read this:
http://support.microsoft.com/kb/q189170/

Regards,
Joakim

 

[Just Me]

You would use FFFF0000 ??

thanks

I think this is due to VB's lack of bit operations, but then again I can't
tell VB from a hole in the ground

Read this:
http://support.microsoft.com/kb/q189170/

Regards,
Joakim

 

[jeff]

I'd guess that the purpose is to avoid sign extension that would result in the
division operation.

 

[Just Me]

guess that's it
thanks

I'd guess that the purpose is to avoid sign extension that would result in
the
division operation.