🚀 go-pugleaf

Hi (posted previously in ActiveX group - not sure if it was the right
group - reposting here),

My COM server works well - but I found that some clients using it in C# had
bizarre problems which initially seemed unrelated.

After more investigation, I discovered that the .NET RTL expects all
exceptions to be masked. and that somehow when my component was created the
FPU exception mask was changed. I was able to reproduce this. I added a
routine to the end of my constructor and calls inside the COM server like
this:

SetExceptionMask(TFPUExceptionMask() << exInvalidOp
    << exDenormalized << exZeroDivide << exOverflow
    << exUnderflow << exPrecision);

And, now the C# code all works exactly like expected. (no problem).  My
questions are:

1) Does this only set the exception mask for the current process? (I hope
so).

2) Is this going to screw up other clients? (non .NET) This makes me
nervous.

3) I tried getting the current control word in my constructor inside the COM
server with good intentions to try and restore it later, just before it
exited - but for some reason by the time my constructor is called - it is
already changed!  I suspect that some mechanism inside the COM server
auto-generated code is changing it.  Is there a better way for me to get,
change and the *restore* the control word from inside my COM server?

TIA.
M.