VB6 doesn't seem to be able to specify that a Double contains MAXDOUBLE, MINDOUBLE, +INFINITY, -INFINITY or NaN. (I could be wrong on that as there may be some undocumented feature hiding in there somewhere.)
Anyway, I came up with a way of storing these values into Doubles so that they could be used in a Complex Numbers library I've been writing.
Essentially, I create an 8 byte array, load it up with the relevant values, and then, using API calls and the VarPtr function, store the contents of the array into the storage used by the Double.
Here's the code. First the declarations.
Then the routine that does the work.
Finally, a slice out of the Complex Numbers project demonstrating the use of some of these declarations.
© Copyright Bruce M. Axtens, 2009